diff options
Diffstat (limited to 'diff.c')
| -rw-r--r-- | diff.c | 6093 |
1 files changed, 6093 insertions, 0 deletions
diff --git a/diff.c b/diff.c new file mode 100644 index 0000000000..21c3838b25 --- /dev/null +++ b/diff.c @@ -0,0 +1,6093 @@ +/* + * Copyright (C) 2005 Junio C Hamano + */ +#include "cache.h" +#include "config.h" +#include "tempfile.h" +#include "quote.h" +#include "diff.h" +#include "diffcore.h" +#include "delta.h" +#include "xdiff-interface.h" +#include "color.h" +#include "attr.h" +#include "run-command.h" +#include "utf8.h" +#include "userdiff.h" +#include "submodule-config.h" +#include "submodule.h" +#include "hashmap.h" +#include "ll-merge.h" +#include "string-list.h" +#include "argv-array.h" +#include "graph.h" +#include "packfile.h" + +#ifdef NO_FAST_WORKING_DIRECTORY +#define FAST_WORKING_DIRECTORY 0 +#else +#define FAST_WORKING_DIRECTORY 1 +#endif + +static int diff_detect_rename_default; +static int diff_indent_heuristic = 1; +static int diff_rename_limit_default = 400; +static int diff_suppress_blank_empty; +static int diff_use_color_default = -1; +static int diff_color_moved_default; +static int diff_context_default = 3; +static int diff_interhunk_context_default; +static const char *diff_word_regex_cfg; +static const char *external_diff_cmd_cfg; +static const char *diff_order_file_cfg; +int diff_auto_refresh_index = 1; +static int diff_mnemonic_prefix; +static int diff_no_prefix; +static int diff_stat_graph_width; +static int diff_dirstat_permille_default = 30; +static struct diff_options default_diff_options; +static long diff_algorithm; +static unsigned ws_error_highlight_default = WSEH_NEW; + +static char diff_colors[][COLOR_MAXLEN] = { + GIT_COLOR_RESET, + GIT_COLOR_NORMAL, /* CONTEXT */ + GIT_COLOR_BOLD, /* METAINFO */ + GIT_COLOR_CYAN, /* FRAGINFO */ + GIT_COLOR_RED, /* OLD */ + GIT_COLOR_GREEN, /* NEW */ + GIT_COLOR_YELLOW, /* COMMIT */ + GIT_COLOR_BG_RED, /* WHITESPACE */ + GIT_COLOR_NORMAL, /* FUNCINFO */ + GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */ + GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */ + GIT_COLOR_FAINT, /* OLD_MOVED_DIM */ + GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */ + GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */ + GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */ + GIT_COLOR_FAINT, /* NEW_MOVED_DIM */ + GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */ +}; + +static NORETURN void die_want_option(const char *option_name) +{ + die(_("option '%s' requires a value"), option_name); +} + +static int parse_diff_color_slot(const char *var) +{ + if (!strcasecmp(var, "context") || !strcasecmp(var, "plain")) + return DIFF_CONTEXT; + if (!strcasecmp(var, "meta")) + return DIFF_METAINFO; + if (!strcasecmp(var, "frag")) + return DIFF_FRAGINFO; + if (!strcasecmp(var, "old")) + return DIFF_FILE_OLD; + if (!strcasecmp(var, "new")) + return DIFF_FILE_NEW; + if (!strcasecmp(var, "commit")) + return DIFF_COMMIT; + if (!strcasecmp(var, "whitespace")) + return DIFF_WHITESPACE; + if (!strcasecmp(var, "func")) + return DIFF_FUNCINFO; + if (!strcasecmp(var, "oldmoved")) + return DIFF_FILE_OLD_MOVED; + if (!strcasecmp(var, "oldmovedalternative")) + return DIFF_FILE_OLD_MOVED_ALT; + if (!strcasecmp(var, "oldmoveddimmed")) + return DIFF_FILE_OLD_MOVED_DIM; + if (!strcasecmp(var, "oldmovedalternativedimmed")) + return DIFF_FILE_OLD_MOVED_ALT_DIM; + if (!strcasecmp(var, "newmoved")) + return DIFF_FILE_NEW_MOVED; + if (!strcasecmp(var, "newmovedalternative")) + return DIFF_FILE_NEW_MOVED_ALT; + if (!strcasecmp(var, "newmoveddimmed")) + return DIFF_FILE_NEW_MOVED_DIM; + if (!strcasecmp(var, "newmovedalternativedimmed")) + return DIFF_FILE_NEW_MOVED_ALT_DIM; + return -1; +} + +static int parse_dirstat_params(struct diff_options *options, const char *params_string, + struct strbuf *errmsg) +{ + char *params_copy = xstrdup(params_string); + struct string_list params = STRING_LIST_INIT_NODUP; + int ret = 0; + int i; + + if (*params_copy) + string_list_split_in_place(¶ms, params_copy, ',', -1); + for (i = 0; i < params.nr; i++) { + const char *p = params.items[i].string; + if (!strcmp(p, "changes")) { + options->flags.dirstat_by_line = 0; + options->flags.dirstat_by_file = 0; + } else if (!strcmp(p, "lines")) { + options->flags.dirstat_by_line = 1; + options->flags.dirstat_by_file = 0; + } else if (!strcmp(p, "files")) { + options->flags.dirstat_by_line = 0; + options->flags.dirstat_by_file = 1; + } else if (!strcmp(p, "noncumulative")) { + options->flags.dirstat_cumulative = 0; + } else if (!strcmp(p, "cumulative")) { + options->flags.dirstat_cumulative = 1; + } else if (isdigit(*p)) { + char *end; + int permille = strtoul(p, &end, 10) * 10; + if (*end == '.' && isdigit(*++end)) { + /* only use first digit */ + permille += *end - '0'; + /* .. and ignore any further digits */ + while (isdigit(*++end)) + ; /* nothing */ + } + if (!*end) + options->dirstat_permille = permille; + else { + strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"), + p); + ret++; + } + } else { + strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p); + ret++; + } + + } + string_list_clear(¶ms, 0); + free(params_copy); + return ret; +} + +static int parse_submodule_params(struct diff_options *options, const char *value) +{ + if (!strcmp(value, "log")) + options->submodule_format = DIFF_SUBMODULE_LOG; + else if (!strcmp(value, "short")) + options->submodule_format = DIFF_SUBMODULE_SHORT; + else if (!strcmp(value, "diff")) + options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF; + else + return -1; + return 0; +} + +static int git_config_rename(const char *var, const char *value) +{ + if (!value) + return DIFF_DETECT_RENAME; + if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy")) + return DIFF_DETECT_COPY; + return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0; +} + +long parse_algorithm_value(const char *value) +{ + if (!value) + return -1; + else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default")) + return 0; + else if (!strcasecmp(value, "minimal")) + return XDF_NEED_MINIMAL; + else if (!strcasecmp(value, "patience")) + return XDF_PATIENCE_DIFF; + else if (!strcasecmp(value, "histogram")) + return XDF_HISTOGRAM_DIFF; + return -1; +} + +static int parse_one_token(const char **arg, const char *token) +{ + const char *rest; + if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) { + *arg = rest; + return 1; + } + return 0; +} + +static int parse_ws_error_highlight(const char *arg) +{ + const char *orig_arg = arg; + unsigned val = 0; + + while (*arg) { + if (parse_one_token(&arg, "none")) + val = 0; + else if (parse_one_token(&arg, "default")) + val = WSEH_NEW; + else if (parse_one_token(&arg, "all")) + val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT; + else if (parse_one_token(&arg, "new")) + val |= WSEH_NEW; + else if (parse_one_token(&arg, "old")) + val |= WSEH_OLD; + else if (parse_one_token(&arg, "context")) + val |= WSEH_CONTEXT; + else { + return -1 - (int)(arg - orig_arg); + } + if (*arg) + arg++; + } + return val; +} + +/* + * These are to give UI layer defaults. + * The core-level commands such as git-diff-files should + * never be affected by the setting of diff.renames + * the user happens to have in the configuration file. + */ +void init_diff_ui_defaults(void) +{ + diff_detect_rename_default = DIFF_DETECT_RENAME; +} + +int git_diff_heuristic_config(const char *var, const char *value, void *cb) +{ + if (!strcmp(var, "diff.indentheuristic")) + diff_indent_heuristic = git_config_bool(var, value); + return 0; +} + +static int parse_color_moved(const char *arg) +{ + switch (git_parse_maybe_bool(arg)) { + case 0: + return COLOR_MOVED_NO; + case 1: + return COLOR_MOVED_DEFAULT; + default: + break; + } + + if (!strcmp(arg, "no")) + return COLOR_MOVED_NO; + else if (!strcmp(arg, "plain")) + return COLOR_MOVED_PLAIN; + else if (!strcmp(arg, "zebra")) + return COLOR_MOVED_ZEBRA; + else if (!strcmp(arg, "default")) + return COLOR_MOVED_DEFAULT; + else if (!strcmp(arg, "dimmed_zebra")) + return COLOR_MOVED_ZEBRA_DIM; + else + return error(_("color moved setting must be one of 'no', 'default', 'zebra', 'dimmed_zebra', 'plain'")); +} + +int git_diff_ui_config(const char *var, const char *value, void *cb) +{ + if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) { + diff_use_color_default = git_config_colorbool(var, value); + return 0; + } + if (!strcmp(var, "diff.colormoved")) { + int cm = parse_color_moved(value); + if (cm < 0) + return -1; + diff_color_moved_default = cm; + return 0; + } + if (!strcmp(var, "diff.context")) { + diff_context_default = git_config_int(var, value); + if (diff_context_default < 0) + return -1; + return 0; + } + if (!strcmp(var, "diff.interhunkcontext")) { + diff_interhunk_context_default = git_config_int(var, value); + if (diff_interhunk_context_default < 0) + return -1; + return 0; + } + if (!strcmp(var, "diff.renames")) { + diff_detect_rename_default = git_config_rename(var, value); + return 0; + } + if (!strcmp(var, "diff.autorefreshindex")) { + diff_auto_refresh_index = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "diff.mnemonicprefix")) { + diff_mnemonic_prefix = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "diff.noprefix")) { + diff_no_prefix = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "diff.statgraphwidth")) { + diff_stat_graph_width = git_config_int(var, value); + return 0; + } + if (!strcmp(var, "diff.external")) + return git_config_string(&external_diff_cmd_cfg, var, value); + if (!strcmp(var, "diff.wordregex")) + return git_config_string(&diff_word_regex_cfg, var, value); + if (!strcmp(var, "diff.orderfile")) + return git_config_pathname(&diff_order_file_cfg, var, value); + + if (!strcmp(var, "diff.ignoresubmodules")) + handle_ignore_submodules_arg(&default_diff_options, value); + + if (!strcmp(var, "diff.submodule")) { + if (parse_submodule_params(&default_diff_options, value)) + warning(_("Unknown value for 'diff.submodule' config variable: '%s'"), + value); + return 0; + } + + if (!strcmp(var, "diff.algorithm")) { + diff_algorithm = parse_algorithm_value(value); + if (diff_algorithm < 0) + return -1; + return 0; + } + + if (!strcmp(var, "diff.wserrorhighlight")) { + int val = parse_ws_error_highlight(value); + if (val < 0) + return -1; + ws_error_highlight_default = val; + return 0; + } + + if (git_color_config(var, value, cb) < 0) + return -1; + + return git_diff_basic_config(var, value, cb); +} + +int git_diff_basic_config(const char *var, const char *value, void *cb) +{ + const char *name; + + if (!strcmp(var, "diff.renamelimit")) { + diff_rename_limit_default = git_config_int(var, value); + return 0; + } + + if (userdiff_config(var, value) < 0) + return -1; + + if (skip_prefix(var, "diff.color.", &name) || + skip_prefix(var, "color.diff.", &name)) { + int slot = parse_diff_color_slot(name); + if (slot < 0) + return 0; + if (!value) + return config_error_nonbool(var); + return color_parse(value, diff_colors[slot]); + } + + /* like GNU diff's --suppress-blank-empty option */ + if (!strcmp(var, "diff.suppressblankempty") || + /* for backwards compatibility */ + !strcmp(var, "diff.suppress-blank-empty")) { + diff_suppress_blank_empty = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "diff.dirstat")) { + struct strbuf errmsg = STRBUF_INIT; + default_diff_options.dirstat_permille = diff_dirstat_permille_default; + if (parse_dirstat_params(&default_diff_options, value, &errmsg)) + warning(_("Found errors in 'diff.dirstat' config variable:\n%s"), + errmsg.buf); + strbuf_release(&errmsg); + diff_dirstat_permille_default = default_diff_options.dirstat_permille; + return 0; + } + + if (git_diff_heuristic_config(var, value, cb) < 0) + return -1; + + return git_default_config(var, value, cb); +} + +static char *quote_two(const char *one, const char *two) +{ + int need_one = quote_c_style(one, NULL, NULL, 1); + int need_two = quote_c_style(two, NULL, NULL, 1); + struct strbuf res = STRBUF_INIT; + + if (need_one + need_two) { + strbuf_addch(&res, '"'); + quote_c_style(one, &res, NULL, 1); + quote_c_style(two, &res, NULL, 1); + strbuf_addch(&res, '"'); + } else { + strbuf_addstr(&res, one); + strbuf_addstr(&res, two); + } + return strbuf_detach(&res, NULL); +} + +static const char *external_diff(void) +{ + static const char *external_diff_cmd = NULL; + static int done_preparing = 0; + + if (done_preparing) + return external_diff_cmd; + external_diff_cmd = getenv("GIT_EXTERNAL_DIFF"); + if (!external_diff_cmd) + external_diff_cmd = external_diff_cmd_cfg; + done_preparing = 1; + return external_diff_cmd; +} + +/* + * Keep track of files used for diffing. Sometimes such an entry + * refers to a temporary file, sometimes to an existing file, and + * sometimes to "/dev/null". + */ +static struct diff_tempfile { + /* + * filename external diff should read from, or NULL if this + * entry is currently not in use: + */ + const char *name; + + char hex[GIT_MAX_HEXSZ + 1]; + char mode[10]; + + /* + * If this diff_tempfile instance refers to a temporary file, + * this tempfile object is used to manage its lifetime. + */ + struct tempfile *tempfile; +} diff_temp[2]; + +struct emit_callback { + int color_diff; + unsigned ws_rule; + int blank_at_eof_in_preimage; + int blank_at_eof_in_postimage; + int lno_in_preimage; + int lno_in_postimage; + const char **label_path; + struct diff_words_data *diff_words; + struct diff_options *opt; + struct strbuf *header; +}; + +static int count_lines(const char *data, int size) +{ + int count, ch, completely_empty = 1, nl_just_seen = 0; + count = 0; + while (0 < size--) { + ch = *data++; + if (ch == '\n') { + count++; + nl_just_seen = 1; + completely_empty = 0; + } + else { + nl_just_seen = 0; + completely_empty = 0; + } + } + if (completely_empty) + return 0; + if (!nl_just_seen) + count++; /* no trailing newline */ + return count; +} + +static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one) +{ + if (!DIFF_FILE_VALID(one)) { + mf->ptr = (char *)""; /* does not matter */ + mf->size = 0; + return 0; + } + else if (diff_populate_filespec(one, 0)) + return -1; + + mf->ptr = one->data; + mf->size = one->size; + return 0; +} + +/* like fill_mmfile, but only for size, so we can avoid retrieving blob */ +static unsigned long diff_filespec_size(struct diff_filespec *one) +{ + if (!DIFF_FILE_VALID(one)) + return 0; + diff_populate_filespec(one, CHECK_SIZE_ONLY); + return one->size; +} + +static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule) +{ + char *ptr = mf->ptr; + long size = mf->size; + int cnt = 0; + + if (!size) + return cnt; + ptr += size - 1; /* pointing at the very end */ + if (*ptr != '\n') + ; /* incomplete line */ + else + ptr--; /* skip the last LF */ + while (mf->ptr < ptr) { + char *prev_eol; + for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--) + if (*prev_eol == '\n') + break; + if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule)) + break; + cnt++; + ptr = prev_eol - 1; + } + return cnt; +} + +static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2, + struct emit_callback *ecbdata) +{ + int l1, l2, at; + unsigned ws_rule = ecbdata->ws_rule; + l1 = count_trailing_blank(mf1, ws_rule); + l2 = count_trailing_blank(mf2, ws_rule); + if (l2 <= l1) { + ecbdata->blank_at_eof_in_preimage = 0; + ecbdata->blank_at_eof_in_postimage = 0; + return; + } + at = count_lines(mf1->ptr, mf1->size); + ecbdata->blank_at_eof_in_preimage = (at - l1) + 1; + + at = count_lines(mf2->ptr, mf2->size); + ecbdata->blank_at_eof_in_postimage = (at - l2) + 1; +} + +static void emit_line_0(struct diff_options *o, const char *set, const char *reset, + int first, const char *line, int len) +{ + int has_trailing_newline, has_trailing_carriage_return; + int nofirst; + FILE *file = o->file; + + fputs(diff_line_prefix(o), file); + + if (len == 0) { + has_trailing_newline = (first == '\n'); + has_trailing_carriage_return = (!has_trailing_newline && + (first == '\r')); + nofirst = has_trailing_newline || has_trailing_carriage_return; + } else { + has_trailing_newline = (len > 0 && line[len-1] == '\n'); + if (has_trailing_newline) + len--; + has_trailing_carriage_return = (len > 0 && line[len-1] == '\r'); + if (has_trailing_carriage_return) + len--; + nofirst = 0; + } + + if (len || !nofirst) { + fputs(set, file); + if (!nofirst) + fputc(first, file); + fwrite(line, len, 1, file); + fputs(reset, file); + } + if (has_trailing_carriage_return) + fputc('\r', file); + if (has_trailing_newline) + fputc('\n', file); +} + +static void emit_line(struct diff_options *o, const char *set, const char *reset, + const char *line, int len) +{ + emit_line_0(o, set, reset, line[0], line+1, len-1); +} + +enum diff_symbol { + DIFF_SYMBOL_BINARY_DIFF_HEADER, + DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA, + DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL, + DIFF_SYMBOL_BINARY_DIFF_BODY, + DIFF_SYMBOL_BINARY_DIFF_FOOTER, + DIFF_SYMBOL_STATS_SUMMARY_NO_FILES, + DIFF_SYMBOL_STATS_SUMMARY_ABBREV, + DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES, + DIFF_SYMBOL_STATS_LINE, + DIFF_SYMBOL_WORD_DIFF, + DIFF_SYMBOL_STAT_SEP, + DIFF_SYMBOL_SUMMARY, + DIFF_SYMBOL_SUBMODULE_ADD, + DIFF_SYMBOL_SUBMODULE_DEL, + DIFF_SYMBOL_SUBMODULE_UNTRACKED, + DIFF_SYMBOL_SUBMODULE_MODIFIED, + DIFF_SYMBOL_SUBMODULE_HEADER, + DIFF_SYMBOL_SUBMODULE_ERROR, + DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, + DIFF_SYMBOL_REWRITE_DIFF, + DIFF_SYMBOL_BINARY_FILES, + DIFF_SYMBOL_HEADER, + DIFF_SYMBOL_FILEPAIR_PLUS, + DIFF_SYMBOL_FILEPAIR_MINUS, + DIFF_SYMBOL_WORDS_PORCELAIN, + DIFF_SYMBOL_WORDS, + DIFF_SYMBOL_CONTEXT, + DIFF_SYMBOL_CONTEXT_INCOMPLETE, + DIFF_SYMBOL_PLUS, + DIFF_SYMBOL_MINUS, + DIFF_SYMBOL_NO_LF_EOF, + DIFF_SYMBOL_CONTEXT_FRAGINFO, + DIFF_SYMBOL_CONTEXT_MARKER, + DIFF_SYMBOL_SEPARATOR +}; +/* + * Flags for content lines: + * 0..12 are whitespace rules + * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT + * 16 is marking if the line is blank at EOF + */ +#define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16) +#define DIFF_SYMBOL_MOVED_LINE (1<<17) +#define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18) +#define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19) +#define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK) + +/* + * This struct is used when we need to buffer the output of the diff output. + * + * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer + * into the pre/post image file. This pointer could be a union with the + * line pointer. By storing an offset into the file instead of the literal line, + * we can decrease the memory footprint for the buffered output. At first we + * may want to only have indirection for the content lines, but we could also + * enhance the state for emitting prefabricated lines, e.g. the similarity + * score line or hunk/file headers would only need to store a number or path + * and then the output can be constructed later on depending on state. + */ +struct emitted_diff_symbol { + const char *line; + int len; + int flags; + enum diff_symbol s; +}; +#define EMITTED_DIFF_SYMBOL_INIT {NULL} + +struct emitted_diff_symbols { + struct emitted_diff_symbol *buf; + int nr, alloc; +}; +#define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0} + +static void append_emitted_diff_symbol(struct diff_options *o, + struct emitted_diff_symbol *e) +{ + struct emitted_diff_symbol *f; + + ALLOC_GROW(o->emitted_symbols->buf, + o->emitted_symbols->nr + 1, + o->emitted_symbols->alloc); + f = &o->emitted_symbols->buf[o->emitted_symbols->nr++]; + + memcpy(f, e, sizeof(struct emitted_diff_symbol)); + f->line = e->line ? xmemdupz(e->line, e->len) : NULL; +} + +struct moved_entry { + struct hashmap_entry ent; + const struct emitted_diff_symbol *es; + struct moved_entry *next_line; +}; + +static int moved_entry_cmp(const struct diff_options *diffopt, + const struct moved_entry *a, + const struct moved_entry *b, + const void *keydata) +{ + return !xdiff_compare_lines(a->es->line, a->es->len, + b->es->line, b->es->len, + diffopt->xdl_opts); +} + +static struct moved_entry *prepare_entry(struct diff_options *o, + int line_no) +{ + struct moved_entry *ret = xmalloc(sizeof(*ret)); + struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no]; + + ret->ent.hash = xdiff_hash_string(l->line, l->len, o->xdl_opts); + ret->es = l; + ret->next_line = NULL; + + return ret; +} + +static void add_lines_to_move_detection(struct diff_options *o, + struct hashmap *add_lines, + struct hashmap *del_lines) +{ + struct moved_entry *prev_line = NULL; + + int n; + for (n = 0; n < o->emitted_symbols->nr; n++) { + struct hashmap *hm; + struct moved_entry *key; + + switch (o->emitted_symbols->buf[n].s) { + case DIFF_SYMBOL_PLUS: + hm = add_lines; + break; + case DIFF_SYMBOL_MINUS: + hm = del_lines; + break; + default: + prev_line = NULL; + continue; + } + + key = prepare_entry(o, n); + if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s) + prev_line->next_line = key; + + hashmap_add(hm, key); + prev_line = key; + } +} + +static int shrink_potential_moved_blocks(struct moved_entry **pmb, + int pmb_nr) +{ + int lp, rp; + + /* Shrink the set of potential block to the remaining running */ + for (lp = 0, rp = pmb_nr - 1; lp <= rp;) { + while (lp < pmb_nr && pmb[lp]) + lp++; + /* lp points at the first NULL now */ + + while (rp > -1 && !pmb[rp]) + rp--; + /* rp points at the last non-NULL */ + + if (lp < pmb_nr && rp > -1 && lp < rp) { + pmb[lp] = pmb[rp]; + pmb[rp] = NULL; + rp--; + lp++; + } + } + + /* Remember the number of running sets */ + return rp + 1; +} + +/* + * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing. + * + * Otherwise, if the last block has fewer alphanumeric characters than + * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in + * that block. + * + * The last block consists of the (n - block_length)'th line up to but not + * including the nth line. + * + * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c. + * Think of a way to unify them. + */ +static void adjust_last_block(struct diff_options *o, int n, int block_length) +{ + int i, alnum_count = 0; + if (o->color_moved == COLOR_MOVED_PLAIN) + return; + for (i = 1; i < block_length + 1; i++) { + const char *c = o->emitted_symbols->buf[n - i].line; + for (; *c; c++) { + if (!isalnum(*c)) + continue; + alnum_count++; + if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT) + return; + } + } + for (i = 1; i < block_length + 1; i++) + o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE; +} + +/* Find blocks of moved code, delegate actual coloring decision to helper */ +static void mark_color_as_moved(struct diff_options *o, + struct hashmap *add_lines, + struct hashmap *del_lines) +{ + struct moved_entry **pmb = NULL; /* potentially moved blocks */ + int pmb_nr = 0, pmb_alloc = 0; + int n, flipped_block = 1, block_length = 0; + + + for (n = 0; n < o->emitted_symbols->nr; n++) { + struct hashmap *hm = NULL; + struct moved_entry *key; + struct moved_entry *match = NULL; + struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n]; + int i; + + switch (l->s) { + case DIFF_SYMBOL_PLUS: + hm = del_lines; + key = prepare_entry(o, n); + match = hashmap_get(hm, key, o); + free(key); + break; + case DIFF_SYMBOL_MINUS: + hm = add_lines; + key = prepare_entry(o, n); + match = hashmap_get(hm, key, o); + free(key); + break; + default: + flipped_block = 1; + } + + if (!match) { + adjust_last_block(o, n, block_length); + pmb_nr = 0; + block_length = 0; + continue; + } + + l->flags |= DIFF_SYMBOL_MOVED_LINE; + + if (o->color_moved == COLOR_MOVED_PLAIN) + continue; + + /* Check any potential block runs, advance each or nullify */ + for (i = 0; i < pmb_nr; i++) { + struct moved_entry *p = pmb[i]; + struct moved_entry *pnext = (p && p->next_line) ? + p->next_line : NULL; + if (pnext && !hm->cmpfn(o, pnext, match, NULL)) { + pmb[i] = p->next_line; + } else { + pmb[i] = NULL; + } + } + + pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr); + + if (pmb_nr == 0) { + /* + * The current line is the start of a new block. + * Setup the set of potential blocks. + */ + for (; match; match = hashmap_get_next(hm, match)) { + ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc); + pmb[pmb_nr++] = match; + } + + flipped_block = (flipped_block + 1) % 2; + + adjust_last_block(o, n, block_length); + block_length = 0; + } + + block_length++; + + if (flipped_block) + l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT; + } + adjust_last_block(o, n, block_length); + + free(pmb); +} + +#define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \ + (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT) +static void dim_moved_lines(struct diff_options *o) +{ + int n; + for (n = 0; n < o->emitted_symbols->nr; n++) { + struct emitted_diff_symbol *prev = (n != 0) ? + &o->emitted_symbols->buf[n - 1] : NULL; + struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n]; + struct emitted_diff_symbol *next = + (n < o->emitted_symbols->nr - 1) ? + &o->emitted_symbols->buf[n + 1] : NULL; + + /* Not a plus or minus line? */ + if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS) + continue; + + /* Not a moved line? */ + if (!(l->flags & DIFF_SYMBOL_MOVED_LINE)) + continue; + + /* + * If prev or next are not a plus or minus line, + * pretend they don't exist + */ + if (prev && prev->s != DIFF_SYMBOL_PLUS && + prev->s != DIFF_SYMBOL_MINUS) + prev = NULL; + if (next && next->s != DIFF_SYMBOL_PLUS && + next->s != DIFF_SYMBOL_MINUS) + next = NULL; + + /* Inside a block? */ + if ((prev && + (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) == + (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) && + (next && + (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) == + (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) { + l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING; + continue; + } + + /* Check if we are at an interesting bound: */ + if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) && + (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) != + (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT)) + continue; + if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) && + (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) != + (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT)) + continue; + + /* + * The boundary to prev and next are not interesting, + * so this line is not interesting as a whole + */ + l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING; + } +} + +static void emit_line_ws_markup(struct diff_options *o, + const char *set, const char *reset, + const char *line, int len, char sign, + unsigned ws_rule, int blank_at_eof) +{ + const char *ws = NULL; + + if (o->ws_error_highlight & ws_rule) { + ws = diff_get_color_opt(o, DIFF_WHITESPACE); + if (!*ws) + ws = NULL; + } + + if (!ws) + emit_line_0(o, set, reset, sign, line, len); + else if (blank_at_eof) + /* Blank line at EOF - paint '+' as well */ + emit_line_0(o, ws, reset, sign, line, len); + else { + /* Emit just the prefix, then the rest. */ + emit_line_0(o, set, reset, sign, "", 0); + ws_check_emit(line, len, ws_rule, + o->file, set, reset, ws); + } +} + +static void emit_diff_symbol_from_struct(struct diff_options *o, + struct emitted_diff_symbol *eds) +{ + static const char *nneof = " No newline at end of file\n"; + const char *context, *reset, *set, *meta, *fraginfo; + struct strbuf sb = STRBUF_INIT; + + enum diff_symbol s = eds->s; + const char *line = eds->line; + int len = eds->len; + unsigned flags = eds->flags; + + switch (s) { + case DIFF_SYMBOL_NO_LF_EOF: + context = diff_get_color_opt(o, DIFF_CONTEXT); + reset = diff_get_color_opt(o, DIFF_RESET); + putc('\n', o->file); + emit_line_0(o, context, reset, '\\', + nneof, strlen(nneof)); + break; + case DIFF_SYMBOL_SUBMODULE_HEADER: + case DIFF_SYMBOL_SUBMODULE_ERROR: + case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH: + case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES: + case DIFF_SYMBOL_SUMMARY: + case DIFF_SYMBOL_STATS_LINE: + case DIFF_SYMBOL_BINARY_DIFF_BODY: + case DIFF_SYMBOL_CONTEXT_FRAGINFO: + emit_line(o, "", "", line, len); + break; + case DIFF_SYMBOL_CONTEXT_INCOMPLETE: + case DIFF_SYMBOL_CONTEXT_MARKER: + context = diff_get_color_opt(o, DIFF_CONTEXT); + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line(o, context, reset, line, len); + break; + case DIFF_SYMBOL_SEPARATOR: + fprintf(o->file, "%s%c", + diff_line_prefix(o), + o->line_termination); + break; + case DIFF_SYMBOL_CONTEXT: + set = diff_get_color_opt(o, DIFF_CONTEXT); + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line_ws_markup(o, set, reset, line, len, ' ', + flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0); + break; + case DIFF_SYMBOL_PLUS: + switch (flags & (DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) { + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING: + set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM); + break; + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT: + set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT); + break; + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING: + set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM); + break; + case DIFF_SYMBOL_MOVED_LINE: + set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED); + break; + default: + set = diff_get_color_opt(o, DIFF_FILE_NEW); + } + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line_ws_markup(o, set, reset, line, len, '+', + flags & DIFF_SYMBOL_CONTENT_WS_MASK, + flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF); + break; + case DIFF_SYMBOL_MINUS: + switch (flags & (DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) { + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING: + set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM); + break; + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT: + set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT); + break; + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING: + set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM); + break; + case DIFF_SYMBOL_MOVED_LINE: + set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED); + break; + default: + set = diff_get_color_opt(o, DIFF_FILE_OLD); + } + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line_ws_markup(o, set, reset, line, len, '-', + flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0); + break; + case DIFF_SYMBOL_WORDS_PORCELAIN: + context = diff_get_color_opt(o, DIFF_CONTEXT); + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line(o, context, reset, line, len); + fputs("~\n", o->file); + break; + case DIFF_SYMBOL_WORDS: + context = diff_get_color_opt(o, DIFF_CONTEXT); + reset = diff_get_color_opt(o, DIFF_RESET); + /* + * Skip the prefix character, if any. With + * diff_suppress_blank_empty, there may be + * none. + */ + if (line[0] != '\n') { + line++; + len--; + } + emit_line(o, context, reset, line, len); + break; + case DIFF_SYMBOL_FILEPAIR_PLUS: + meta = diff_get_color_opt(o, DIFF_METAINFO); + reset = diff_get_color_opt(o, DIFF_RESET); + fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta, + line, reset, + strchr(line, ' ') ? "\t" : ""); + break; + case DIFF_SYMBOL_FILEPAIR_MINUS: + meta = diff_get_color_opt(o, DIFF_METAINFO); + reset = diff_get_color_opt(o, DIFF_RESET); + fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta, + line, reset, + strchr(line, ' ') ? "\t" : ""); + break; + case DIFF_SYMBOL_BINARY_FILES: + case DIFF_SYMBOL_HEADER: + fprintf(o->file, "%s", line); + break; + case DIFF_SYMBOL_BINARY_DIFF_HEADER: + fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o)); + break; + case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA: + fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line); + break; + case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL: + fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line); + break; + case DIFF_SYMBOL_BINARY_DIFF_FOOTER: + fputs(diff_line_prefix(o), o->file); + fputc('\n', o->file); + break; + case DIFF_SYMBOL_REWRITE_DIFF: + fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO); + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line(o, fraginfo, reset, line, len); + break; + case DIFF_SYMBOL_SUBMODULE_ADD: + set = diff_get_color_opt(o, DIFF_FILE_NEW); + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line(o, set, reset, line, len); + break; + case DIFF_SYMBOL_SUBMODULE_DEL: + set = diff_get_color_opt(o, DIFF_FILE_OLD); + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line(o, set, reset, line, len); + break; + case DIFF_SYMBOL_SUBMODULE_UNTRACKED: + fprintf(o->file, "%sSubmodule %s contains untracked content\n", + diff_line_prefix(o), line); + break; + case DIFF_SYMBOL_SUBMODULE_MODIFIED: + fprintf(o->file, "%sSubmodule %s contains modified content\n", + diff_line_prefix(o), line); + break; + case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES: + emit_line(o, "", "", " 0 files changed\n", + strlen(" 0 files changed\n")); + break; + case DIFF_SYMBOL_STATS_SUMMARY_ABBREV: + emit_line(o, "", "", " ...\n", strlen(" ...\n")); + break; + case DIFF_SYMBOL_WORD_DIFF: + fprintf(o->file, "%.*s", len, line); + break; + case DIFF_SYMBOL_STAT_SEP: + fputs(o->stat_sep, o->file); + break; + default: + die("BUG: unknown diff symbol"); + } + strbuf_release(&sb); +} + +static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s, + const char *line, int len, unsigned flags) +{ + struct emitted_diff_symbol e = {line, len, flags, s}; + + if (o->emitted_symbols) + append_emitted_diff_symbol(o, &e); + else + emit_diff_symbol_from_struct(o, &e); +} + +void diff_emit_submodule_del(struct diff_options *o, const char *line) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0); +} + +void diff_emit_submodule_add(struct diff_options *o, const char *line) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0); +} + +void diff_emit_submodule_untracked(struct diff_options *o, const char *path) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED, + path, strlen(path), 0); +} + +void diff_emit_submodule_modified(struct diff_options *o, const char *path) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED, + path, strlen(path), 0); +} + +void diff_emit_submodule_header(struct diff_options *o, const char *header) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER, + header, strlen(header), 0); +} + +void diff_emit_submodule_error(struct diff_options *o, const char *err) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0); +} + +void diff_emit_submodule_pipethrough(struct diff_options *o, + const char *line, int len) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0); +} + +static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len) +{ + if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) && + ecbdata->blank_at_eof_in_preimage && + ecbdata->blank_at_eof_in_postimage && + ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage && + ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage)) + return 0; + return ws_blank_line(line, len, ecbdata->ws_rule); +} + +static void emit_add_line(const char *reset, + struct emit_callback *ecbdata, + const char *line, int len) +{ + unsigned flags = WSEH_NEW | ecbdata->ws_rule; + if (new_blank_line_at_eof(ecbdata, line, len)) + flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF; + + emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags); +} + +static void emit_del_line(const char *reset, + struct emit_callback *ecbdata, + const char *line, int len) +{ + unsigned flags = WSEH_OLD | ecbdata->ws_rule; + emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags); +} + +static void emit_context_line(const char *reset, + struct emit_callback *ecbdata, + const char *line, int len) +{ + unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule; + emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags); +} + +static void emit_hunk_header(struct emit_callback *ecbdata, + const char *line, int len) +{ + const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT); + const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO); + const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO); + const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET); + static const char atat[2] = { '@', '@' }; + const char *cp, *ep; + struct strbuf msgbuf = STRBUF_INIT; + int org_len = len; + int i = 1; + + /* + * As a hunk header must begin with "@@ -<old>, +<new> @@", + * it always is at least 10 bytes long. + */ + if (len < 10 || + memcmp(line, atat, 2) || + !(ep = memmem(line + 2, len - 2, atat, 2))) { + emit_diff_symbol(ecbdata->opt, + DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0); + return; + } + ep += 2; /* skip over @@ */ + + /* The hunk header in fraginfo color */ + strbuf_addstr(&msgbuf, frag); + strbuf_add(&msgbuf, line, ep - line); + strbuf_addstr(&msgbuf, reset); + + /* + * trailing "\r\n" + */ + for ( ; i < 3; i++) + if (line[len - i] == '\r' || line[len - i] == '\n') + len--; + + /* blank before the func header */ + for (cp = ep; ep - line < len; ep++) + if (*ep != ' ' && *ep != '\t') + break; + if (ep != cp) { + strbuf_addstr(&msgbuf, context); + strbuf_add(&msgbuf, cp, ep - cp); + strbuf_addstr(&msgbuf, reset); + } + + if (ep < line + len) { + strbuf_addstr(&msgbuf, func); + strbuf_add(&msgbuf, ep, line + len - ep); + strbuf_addstr(&msgbuf, reset); + } + + strbuf_add(&msgbuf, line + len, org_len - len); + strbuf_complete_line(&msgbuf); + emit_diff_symbol(ecbdata->opt, + DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0); + strbuf_release(&msgbuf); +} + +static struct diff_tempfile *claim_diff_tempfile(void) { + int i; + for (i = 0; i < ARRAY_SIZE(diff_temp); i++) + if (!diff_temp[i].name) + return diff_temp + i; + die("BUG: diff is failing to clean up its tempfiles"); +} + +static void remove_tempfile(void) +{ + int i; + for (i = 0; i < ARRAY_SIZE(diff_temp); i++) { + if (is_tempfile_active(diff_temp[i].tempfile)) + delete_tempfile(&diff_temp[i].tempfile); + diff_temp[i].name = NULL; + } +} + +static void add_line_count(struct strbuf *out, int count) +{ + switch (count) { + case 0: + strbuf_addstr(out, "0,0"); + break; + case 1: + strbuf_addstr(out, "1"); + break; + default: + strbuf_addf(out, "1,%d", count); + break; + } +} + +static void emit_rewrite_lines(struct emit_callback *ecb, + int prefix, const char *data, int size) +{ + const char *endp = NULL; + const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET); + + while (0 < size) { + int len; + + endp = memchr(data, '\n', size); + len = endp ? (endp - data + 1) : size; + if (prefix != '+') { + ecb->lno_in_preimage++; + emit_del_line(reset, ecb, data, len); + } else { + ecb->lno_in_postimage++; + emit_add_line(reset, ecb, data, len); + } + size -= len; + data += len; + } + if (!endp) + emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0); +} + +static void emit_rewrite_diff(const char *name_a, + const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + struct userdiff_driver *textconv_one, + struct userdiff_driver *textconv_two, + struct diff_options *o) +{ + int lc_a, lc_b; + static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT; + const char *a_prefix, *b_prefix; + char *data_one, *data_two; + size_t size_one, size_two; + struct emit_callback ecbdata; + struct strbuf out = STRBUF_INIT; + + if (diff_mnemonic_prefix && o->flags.reverse_diff) { + a_prefix = o->b_prefix; + b_prefix = o->a_prefix; + } else { + a_prefix = o->a_prefix; + b_prefix = o->b_prefix; + } + + name_a += (*name_a == '/'); + name_b += (*name_b == '/'); + + strbuf_reset(&a_name); + strbuf_reset(&b_name); + quote_two_c_style(&a_name, a_prefix, name_a, 0); + quote_two_c_style(&b_name, b_prefix, name_b, 0); + + size_one = fill_textconv(textconv_one, one, &data_one); + size_two = fill_textconv(textconv_two, two, &data_two); + + memset(&ecbdata, 0, sizeof(ecbdata)); + ecbdata.color_diff = want_color(o->use_color); + ecbdata.ws_rule = whitespace_rule(name_b); + ecbdata.opt = o; + if (ecbdata.ws_rule & WS_BLANK_AT_EOF) { + mmfile_t mf1, mf2; + mf1.ptr = (char *)data_one; + mf2.ptr = (char *)data_two; + mf1.size = size_one; + mf2.size = size_two; + check_blank_at_eof(&mf1, &mf2, &ecbdata); + } + ecbdata.lno_in_preimage = 1; + ecbdata.lno_in_postimage = 1; + + lc_a = count_lines(data_one, size_one); + lc_b = count_lines(data_two, size_two); + + emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS, + a_name.buf, a_name.len, 0); + emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS, + b_name.buf, b_name.len, 0); + + strbuf_addstr(&out, "@@ -"); + if (!o->irreversible_delete) + add_line_count(&out, lc_a); + else + strbuf_addstr(&out, "?,?"); + strbuf_addstr(&out, " +"); + add_line_count(&out, lc_b); + strbuf_addstr(&out, " @@\n"); + emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0); + strbuf_release(&out); + + if (lc_a && !o->irreversible_delete) + emit_rewrite_lines(&ecbdata, '-', data_one, size_one); + if (lc_b) + emit_rewrite_lines(&ecbdata, '+', data_two, size_two); + if (textconv_one) + free((char *)data_one); + if (textconv_two) + free((char *)data_two); +} + +struct diff_words_buffer { + mmfile_t text; + unsigned long alloc; + struct diff_words_orig { + const char *begin, *end; + } *orig; + int orig_nr, orig_alloc; +}; + +static void diff_words_append(char *line, unsigned long len, + struct diff_words_buffer *buffer) +{ + ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc); + line++; + len--; + memcpy(buffer->text.ptr + buffer->text.size, line, len); + buffer->text.size += len; + buffer->text.ptr[buffer->text.size] = '\0'; +} + +struct diff_words_style_elem { + const char *prefix; + const char *suffix; + const char *color; /* NULL; filled in by the setup code if + * color is enabled */ +}; + +struct diff_words_style { + enum diff_words_type type; + struct diff_words_style_elem new, old, ctx; + const char *newline; +}; + +static struct diff_words_style diff_words_styles[] = { + { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" }, + { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" }, + { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" } +}; + +struct diff_words_data { + struct diff_words_buffer minus, plus; + const char *current_plus; + int last_minus; + struct diff_options *opt; + regex_t *word_regex; + enum diff_words_type type; + struct diff_words_style *style; +}; + +static int fn_out_diff_words_write_helper(struct diff_options *o, + struct diff_words_style_elem *st_el, + const char *newline, + size_t count, const char *buf) +{ + int print = 0; + struct strbuf sb = STRBUF_INIT; + + while (count) { + char *p = memchr(buf, '\n', count); + if (print) + strbuf_addstr(&sb, diff_line_prefix(o)); + + if (p != buf) { + const char *reset = st_el->color && *st_el->color ? + GIT_COLOR_RESET : NULL; + if (st_el->color && *st_el->color) + strbuf_addstr(&sb, st_el->color); + strbuf_addstr(&sb, st_el->prefix); + strbuf_add(&sb, buf, p ? p - buf : count); + strbuf_addstr(&sb, st_el->suffix); + if (reset) + strbuf_addstr(&sb, reset); + } + if (!p) + goto out; + + strbuf_addstr(&sb, newline); + count -= p + 1 - buf; + buf = p + 1; + print = 1; + if (count) { + emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF, + sb.buf, sb.len, 0); + strbuf_reset(&sb); + } + } + +out: + if (sb.len) + emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF, + sb.buf, sb.len, 0); + strbuf_release(&sb); + return 0; +} + +/* + * '--color-words' algorithm can be described as: + * + * 1. collect the minus/plus lines of a diff hunk, divided into + * minus-lines and plus-lines; + * + * 2. break both minus-lines and plus-lines into words and + * place them into two mmfile_t with one word for each line; + * + * 3. use xdiff to run diff on the two mmfile_t to get the words level diff; + * + * And for the common parts of the both file, we output the plus side text. + * diff_words->current_plus is used to trace the current position of the plus file + * which printed. diff_words->last_minus is used to trace the last minus word + * printed. + * + * For '--graph' to work with '--color-words', we need to output the graph prefix + * on each line of color words output. Generally, there are two conditions on + * which we should output the prefix. + * + * 1. diff_words->last_minus == 0 && + * diff_words->current_plus == diff_words->plus.text.ptr + * + * that is: the plus text must start as a new line, and if there is no minus + * word printed, a graph prefix must be printed. + * + * 2. diff_words->current_plus > diff_words->plus.text.ptr && + * *(diff_words->current_plus - 1) == '\n' + * + * that is: a graph prefix must be printed following a '\n' + */ +static int color_words_output_graph_prefix(struct diff_words_data *diff_words) +{ + if ((diff_words->last_minus == 0 && + diff_words->current_plus == diff_words->plus.text.ptr) || + (diff_words->current_plus > diff_words->plus.text.ptr && + *(diff_words->current_plus - 1) == '\n')) { + return 1; + } else { + return 0; + } +} + +static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len) +{ + struct diff_words_data *diff_words = priv; + struct diff_words_style *style = diff_words->style; + int minus_first, minus_len, plus_first, plus_len; + const char *minus_begin, *minus_end, *plus_begin, *plus_end; + struct diff_options *opt = diff_words->opt; + const char *line_prefix; + + if (line[0] != '@' || parse_hunk_header(line, len, + &minus_first, &minus_len, &plus_first, &plus_len)) + return; + + assert(opt); + line_prefix = diff_line_prefix(opt); + + /* POSIX requires that first be decremented by one if len == 0... */ + if (minus_len) { + minus_begin = diff_words->minus.orig[minus_first].begin; + minus_end = + diff_words->minus.orig[minus_first + minus_len - 1].end; + } else + minus_begin = minus_end = + diff_words->minus.orig[minus_first].end; + + if (plus_len) { + plus_begin = diff_words->plus.orig[plus_first].begin; + plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end; + } else + plus_begin = plus_end = diff_words->plus.orig[plus_first].end; + + if (color_words_output_graph_prefix(diff_words)) { + fputs(line_prefix, diff_words->opt->file); + } + if (diff_words->current_plus != plus_begin) { + fn_out_diff_words_write_helper(diff_words->opt, + &style->ctx, style->newline, + plus_begin - diff_words->current_plus, + diff_words->current_plus); + } + if (minus_begin != minus_end) { + fn_out_diff_words_write_helper(diff_words->opt, + &style->old, style->newline, + minus_end - minus_begin, minus_begin); + } + if (plus_begin != plus_end) { + fn_out_diff_words_write_helper(diff_words->opt, + &style->new, style->newline, + plus_end - plus_begin, plus_begin); + } + + diff_words->current_plus = plus_end; + diff_words->last_minus = minus_first; +} + +/* This function starts looking at *begin, and returns 0 iff a word was found. */ +static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex, + int *begin, int *end) +{ + if (word_regex && *begin < buffer->size) { + regmatch_t match[1]; + if (!regexec_buf(word_regex, buffer->ptr + *begin, + buffer->size - *begin, 1, match, 0)) { + char *p = memchr(buffer->ptr + *begin + match[0].rm_so, + '\n', match[0].rm_eo - match[0].rm_so); + *end = p ? p - buffer->ptr : match[0].rm_eo + *begin; + *begin += match[0].rm_so; + return *begin >= *end; + } + return -1; + } + + /* find the next word */ + while (*begin < buffer->size && isspace(buffer->ptr[*begin])) + (*begin)++; + if (*begin >= buffer->size) + return -1; + + /* find the end of the word */ + *end = *begin + 1; + while (*end < buffer->size && !isspace(buffer->ptr[*end])) + (*end)++; + + return 0; +} + +/* + * This function splits the words in buffer->text, stores the list with + * newline separator into out, and saves the offsets of the original words + * in buffer->orig. + */ +static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out, + regex_t *word_regex) +{ + int i, j; + long alloc = 0; + + out->size = 0; + out->ptr = NULL; + + /* fake an empty "0th" word */ + ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc); + buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr; + buffer->orig_nr = 1; + + for (i = 0; i < buffer->text.size; i++) { + if (find_word_boundaries(&buffer->text, word_regex, &i, &j)) + return; + + /* store original boundaries */ + ALLOC_GROW(buffer->orig, buffer->orig_nr + 1, + buffer->orig_alloc); + buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i; + buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j; + buffer->orig_nr++; + + /* store one word */ + ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc); + memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i); + out->ptr[out->size + j - i] = '\n'; + out->size += j - i + 1; + + i = j - 1; + } +} + +/* this executes the word diff on the accumulated buffers */ +static void diff_words_show(struct diff_words_data *diff_words) +{ + xpparam_t xpp; + xdemitconf_t xecfg; + mmfile_t minus, plus; + struct diff_words_style *style = diff_words->style; + + struct diff_options *opt = diff_words->opt; + const char *line_prefix; + + assert(opt); + line_prefix = diff_line_prefix(opt); + + /* special case: only removal */ + if (!diff_words->plus.text.size) { + emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF, + line_prefix, strlen(line_prefix), 0); + fn_out_diff_words_write_helper(diff_words->opt, + &style->old, style->newline, + diff_words->minus.text.size, + diff_words->minus.text.ptr); + diff_words->minus.text.size = 0; + return; + } + + diff_words->current_plus = diff_words->plus.text.ptr; + diff_words->last_minus = 0; + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex); + diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex); + xpp.flags = 0; + /* as only the hunk header will be parsed, we need a 0-context */ + xecfg.ctxlen = 0; + if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words, + &xpp, &xecfg)) + die("unable to generate word diff"); + free(minus.ptr); + free(plus.ptr); + if (diff_words->current_plus != diff_words->plus.text.ptr + + diff_words->plus.text.size) { + if (color_words_output_graph_prefix(diff_words)) + emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF, + line_prefix, strlen(line_prefix), 0); + fn_out_diff_words_write_helper(diff_words->opt, + &style->ctx, style->newline, + diff_words->plus.text.ptr + diff_words->plus.text.size + - diff_words->current_plus, diff_words->current_plus); + } + diff_words->minus.text.size = diff_words->plus.text.size = 0; +} + +/* In "color-words" mode, show word-diff of words accumulated in the buffer */ +static void diff_words_flush(struct emit_callback *ecbdata) +{ + struct diff_options *wo = ecbdata->diff_words->opt; + + if (ecbdata->diff_words->minus.text.size || + ecbdata->diff_words->plus.text.size) + diff_words_show(ecbdata->diff_words); + + if (wo->emitted_symbols) { + struct diff_options *o = ecbdata->opt; + struct emitted_diff_symbols *wol = wo->emitted_symbols; + int i; + + /* + * NEEDSWORK: + * Instead of appending each, concat all words to a line? + */ + for (i = 0; i < wol->nr; i++) + append_emitted_diff_symbol(o, &wol->buf[i]); + + for (i = 0; i < wol->nr; i++) + free((void *)wol->buf[i].line); + + wol->nr = 0; + } +} + +static void diff_filespec_load_driver(struct diff_filespec *one) +{ + /* Use already-loaded driver */ + if (one->driver) + return; + + if (S_ISREG(one->mode)) + one->driver = userdiff_find_by_path(one->path); + + /* Fallback to default settings */ + if (!one->driver) + one->driver = userdiff_find_by_name("default"); +} + +static const char *userdiff_word_regex(struct diff_filespec *one) +{ + diff_filespec_load_driver(one); + return one->driver->word_regex; +} + +static void init_diff_words_data(struct emit_callback *ecbdata, + struct diff_options *orig_opts, + struct diff_filespec *one, + struct diff_filespec *two) +{ + int i; + struct diff_options *o = xmalloc(sizeof(struct diff_options)); + memcpy(o, orig_opts, sizeof(struct diff_options)); + + ecbdata->diff_words = + xcalloc(1, sizeof(struct diff_words_data)); + ecbdata->diff_words->type = o->word_diff; + ecbdata->diff_words->opt = o; + + if (orig_opts->emitted_symbols) + o->emitted_symbols = + xcalloc(1, sizeof(struct emitted_diff_symbols)); + + if (!o->word_regex) + o->word_regex = userdiff_word_regex(one); + if (!o->word_regex) + o->word_regex = userdiff_word_regex(two); + if (!o->word_regex) + o->word_regex = diff_word_regex_cfg; + if (o->word_regex) { + ecbdata->diff_words->word_regex = (regex_t *) + xmalloc(sizeof(regex_t)); + if (regcomp(ecbdata->diff_words->word_regex, + o->word_regex, + REG_EXTENDED | REG_NEWLINE)) + die ("Invalid regular expression: %s", + o->word_regex); + } + for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) { + if (o->word_diff == diff_words_styles[i].type) { + ecbdata->diff_words->style = + &diff_words_styles[i]; + break; + } + } + if (want_color(o->use_color)) { + struct diff_words_style *st = ecbdata->diff_words->style; + st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD); + st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW); + st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT); + } +} + +static void free_diff_words_data(struct emit_callback *ecbdata) +{ + if (ecbdata->diff_words) { + diff_words_flush(ecbdata); + free (ecbdata->diff_words->opt->emitted_symbols); + free (ecbdata->diff_words->opt); + free (ecbdata->diff_words->minus.text.ptr); + free (ecbdata->diff_words->minus.orig); + free (ecbdata->diff_words->plus.text.ptr); + free (ecbdata->diff_words->plus.orig); + if (ecbdata->diff_words->word_regex) { + regfree(ecbdata->diff_words->word_regex); + free(ecbdata->diff_words->word_regex); + } + FREE_AND_NULL(ecbdata->diff_words); + } +} + +const char *diff_get_color(int diff_use_color, enum color_diff ix) +{ + if (want_color(diff_use_color)) + return diff_colors[ix]; + return ""; +} + +const char *diff_line_prefix(struct diff_options *opt) +{ + struct strbuf *msgbuf; + if (!opt->output_prefix) + return ""; + + msgbuf = opt->output_prefix(opt, opt->output_prefix_data); + return msgbuf->buf; +} + +static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len) +{ + const char *cp; + unsigned long allot; + size_t l = len; + + cp = line; + allot = l; + while (0 < l) { + (void) utf8_width(&cp, &l); + if (!cp) + break; /* truncated in the middle? */ + } + return allot - l; +} + +static void find_lno(const char *line, struct emit_callback *ecbdata) +{ + const char *p; + ecbdata->lno_in_preimage = 0; + ecbdata->lno_in_postimage = 0; + p = strchr(line, '-'); + if (!p) + return; /* cannot happen */ + ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10); + p = strchr(p, '+'); + if (!p) + return; /* cannot happen */ + ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10); +} + +static void fn_out_consume(void *priv, char *line, unsigned long len) +{ + struct emit_callback *ecbdata = priv; + const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET); + struct diff_options *o = ecbdata->opt; + + o->found_changes = 1; + + if (ecbdata->header) { + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + ecbdata->header->buf, ecbdata->header->len, 0); + strbuf_reset(ecbdata->header); + ecbdata->header = NULL; + } + + if (ecbdata->label_path[0]) { + emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS, + ecbdata->label_path[0], + strlen(ecbdata->label_path[0]), 0); + emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS, + ecbdata->label_path[1], + strlen(ecbdata->label_path[1]), 0); + ecbdata->label_path[0] = ecbdata->label_path[1] = NULL; + } + + if (diff_suppress_blank_empty + && len == 2 && line[0] == ' ' && line[1] == '\n') { + line[0] = '\n'; + len = 1; + } + + if (line[0] == '@') { + if (ecbdata->diff_words) + diff_words_flush(ecbdata); + len = sane_truncate_line(ecbdata, line, len); + find_lno(line, ecbdata); + emit_hunk_header(ecbdata, line, len); + return; + } + + if (ecbdata->diff_words) { + enum diff_symbol s = + ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ? + DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS; + if (line[0] == '-') { + diff_words_append(line, len, + &ecbdata->diff_words->minus); + return; + } else if (line[0] == '+') { + diff_words_append(line, len, + &ecbdata->diff_words->plus); + return; + } else if (starts_with(line, "\\ ")) { + /* + * Eat the "no newline at eof" marker as if we + * saw a "+" or "-" line with nothing on it, + * and return without diff_words_flush() to + * defer processing. If this is the end of + * preimage, more "+" lines may come after it. + */ + return; + } + diff_words_flush(ecbdata); + emit_diff_symbol(o, s, line, len, 0); + return; + } + + switch (line[0]) { + case '+': + ecbdata->lno_in_postimage++; + emit_add_line(reset, ecbdata, line + 1, len - 1); + break; + case '-': + ecbdata->lno_in_preimage++; + emit_del_line(reset, ecbdata, line + 1, len - 1); + break; + case ' ': + ecbdata->lno_in_postimage++; + ecbdata->lno_in_preimage++; + emit_context_line(reset, ecbdata, line + 1, len - 1); + break; + default: + /* incomplete line at the end */ + ecbdata->lno_in_preimage++; + emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE, + line, len, 0); + break; + } +} + +static char *pprint_rename(const char *a, const char *b) +{ + const char *old = a; + const char *new = b; + struct strbuf name = STRBUF_INIT; + int pfx_length, sfx_length; + int pfx_adjust_for_slash; + int len_a = strlen(a); + int len_b = strlen(b); + int a_midlen, b_midlen; + int qlen_a = quote_c_style(a, NULL, NULL, 0); + int qlen_b = quote_c_style(b, NULL, NULL, 0); + + if (qlen_a || qlen_b) { + quote_c_style(a, &name, NULL, 0); + strbuf_addstr(&name, " => "); + quote_c_style(b, &name, NULL, 0); + return strbuf_detach(&name, NULL); + } + + /* Find common prefix */ + pfx_length = 0; + while (*old && *new && *old == *new) { + if (*old == '/') + pfx_length = old - a + 1; + old++; + new++; + } + + /* Find common suffix */ + old = a + len_a; + new = b + len_b; + sfx_length = 0; + /* + * If there is a common prefix, it must end in a slash. In + * that case we let this loop run 1 into the prefix to see the + * same slash. + * + * If there is no common prefix, we cannot do this as it would + * underrun the input strings. + */ + pfx_adjust_for_slash = (pfx_length ? 1 : 0); + while (a + pfx_length - pfx_adjust_for_slash <= old && + b + pfx_length - pfx_adjust_for_slash <= new && + *old == *new) { + if (*old == '/') + sfx_length = len_a - (old - a); + old--; + new--; + } + + /* + * pfx{mid-a => mid-b}sfx + * {pfx-a => pfx-b}sfx + * pfx{sfx-a => sfx-b} + * name-a => name-b + */ + a_midlen = len_a - pfx_length - sfx_length; + b_midlen = len_b - pfx_length - sfx_length; + if (a_midlen < 0) + a_midlen = 0; + if (b_midlen < 0) + b_midlen = 0; + + strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7); + if (pfx_length + sfx_length) { + strbuf_add(&name, a, pfx_length); + strbuf_addch(&name, '{'); + } + strbuf_add(&name, a + pfx_length, a_midlen); + strbuf_addstr(&name, " => "); + strbuf_add(&name, b + pfx_length, b_midlen); + if (pfx_length + sfx_length) { + strbuf_addch(&name, '}'); + strbuf_add(&name, a + len_a - sfx_length, sfx_length); + } + return strbuf_detach(&name, NULL); +} + +struct diffstat_t { + int nr; + int alloc; + struct diffstat_file { + char *from_name; + char *name; + char *print_name; + unsigned is_unmerged:1; + unsigned is_binary:1; + unsigned is_renamed:1; + unsigned is_interesting:1; + uintmax_t added, deleted; + } **files; +}; + +static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat, + const char *name_a, + const char *name_b) +{ + struct diffstat_file *x; + x = xcalloc(1, sizeof(*x)); + ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc); + diffstat->files[diffstat->nr++] = x; + if (name_b) { + x->from_name = xstrdup(name_a); + x->name = xstrdup(name_b); + x->is_renamed = 1; + } + else { + x->from_name = NULL; + x->name = xstrdup(name_a); + } + return x; +} + +static void diffstat_consume(void *priv, char *line, unsigned long len) +{ + struct diffstat_t *diffstat = priv; + struct diffstat_file *x = diffstat->files[diffstat->nr - 1]; + + if (line[0] == '+') + x->added++; + else if (line[0] == '-') + x->deleted++; +} + +const char mime_boundary_leader[] = "------------"; + +static int scale_linear(int it, int width, int max_change) +{ + if (!it) + return 0; + /* + * make sure that at least one '-' or '+' is printed if + * there is any change to this path. The easiest way is to + * scale linearly as if the alloted width is one column shorter + * than it is, and then add 1 to the result. + */ + return 1 + (it * (width - 1) / max_change); +} + +static void show_graph(struct strbuf *out, char ch, int cnt, + const char *set, const char *reset) +{ + if (cnt <= 0) + return; + strbuf_addstr(out, set); + strbuf_addchars(out, ch, cnt); + strbuf_addstr(out, reset); +} + +static void fill_print_name(struct diffstat_file *file) +{ + char *pname; + + if (file->print_name) + return; + + if (!file->is_renamed) { + struct strbuf buf = STRBUF_INIT; + if (quote_c_style(file->name, &buf, NULL, 0)) { + pname = strbuf_detach(&buf, NULL); + } else { + pname = file->name; + strbuf_release(&buf); + } + } else { + pname = pprint_rename(file->from_name, file->name); + } + file->print_name = pname; +} + +static void print_stat_summary_inserts_deletes(struct diff_options *options, + int files, int insertions, int deletions) +{ + struct strbuf sb = STRBUF_INIT; + + if (!files) { + assert(insertions == 0 && deletions == 0); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES, + NULL, 0, 0); + return; + } + + strbuf_addf(&sb, + (files == 1) ? " %d file changed" : " %d files changed", + files); + + /* + * For binary diff, the caller may want to print "x files + * changed" with insertions == 0 && deletions == 0. + * + * Not omitting "0 insertions(+), 0 deletions(-)" in this case + * is probably less confusing (i.e skip over "2 files changed + * but nothing about added/removed lines? Is this a bug in Git?"). + */ + if (insertions || deletions == 0) { + strbuf_addf(&sb, + (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)", + insertions); + } + + if (deletions || insertions == 0) { + strbuf_addf(&sb, + (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)", + deletions); + } + strbuf_addch(&sb, '\n'); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES, + sb.buf, sb.len, 0); + strbuf_release(&sb); +} + +void print_stat_summary(FILE *fp, int files, + int insertions, int deletions) +{ + struct diff_options o; + memset(&o, 0, sizeof(o)); + o.file = fp; + + print_stat_summary_inserts_deletes(&o, files, insertions, deletions); +} + +static void show_stats(struct diffstat_t *data, struct diff_options *options) +{ + int i, len, add, del, adds = 0, dels = 0; + uintmax_t max_change = 0, max_len = 0; + int total_files = data->nr, count; + int width, name_width, graph_width, number_width = 0, bin_width = 0; + const char *reset, *add_c, *del_c; + int extra_shown = 0; + const char *line_prefix = diff_line_prefix(options); + struct strbuf out = STRBUF_INIT; + + if (data->nr == 0) + return; + + count = options->stat_count ? options->stat_count : data->nr; + + reset = diff_get_color_opt(options, DIFF_RESET); + add_c = diff_get_color_opt(options, DIFF_FILE_NEW); + del_c = diff_get_color_opt(options, DIFF_FILE_OLD); + + /* + * Find the longest filename and max number of changes + */ + for (i = 0; (i < count) && (i < data->nr); i++) { + struct diffstat_file *file = data->files[i]; + uintmax_t change = file->added + file->deleted; + + if (!file->is_interesting && (change == 0)) { + count++; /* not shown == room for one more */ + continue; + } + fill_print_name(file); + len = strlen(file->print_name); + if (max_len < len) + max_len = len; + + if (file->is_unmerged) { + /* "Unmerged" is 8 characters */ + bin_width = bin_width < 8 ? 8 : bin_width; + continue; + } + if (file->is_binary) { + /* "Bin XXX -> YYY bytes" */ + int w = 14 + decimal_width(file->added) + + decimal_width(file->deleted); + bin_width = bin_width < w ? w : bin_width; + /* Display change counts aligned with "Bin" */ + number_width = 3; + continue; + } + + if (max_change < change) + max_change = change; + } + count = i; /* where we can stop scanning in data->files[] */ + + /* + * We have width = stat_width or term_columns() columns total. + * We want a maximum of min(max_len, stat_name_width) for the name part. + * We want a maximum of min(max_change, stat_graph_width) for the +- part. + * We also need 1 for " " and 4 + decimal_width(max_change) + * for " | NNNN " and one the empty column at the end, altogether + * 6 + decimal_width(max_change). + * + * If there's not enough space, we will use the smaller of + * stat_name_width (if set) and 5/8*width for the filename, + * and the rest for constant elements + graph part, but no more + * than stat_graph_width for the graph part. + * (5/8 gives 50 for filename and 30 for the constant parts + graph + * for the standard terminal size). + * + * In other words: stat_width limits the maximum width, and + * stat_name_width fixes the maximum width of the filename, + * and is also used to divide available columns if there + * aren't enough. + * + * Binary files are displayed with "Bin XXX -> YYY bytes" + * instead of the change count and graph. This part is treated + * similarly to the graph part, except that it is not + * "scaled". If total width is too small to accommodate the + * guaranteed minimum width of the filename part and the + * separators and this message, this message will "overflow" + * making the line longer than the maximum width. + */ + + if (options->stat_width == -1) + width = term_columns() - strlen(line_prefix); + else + width = options->stat_width ? options->stat_width : 80; + number_width = decimal_width(max_change) > number_width ? + decimal_width(max_change) : number_width; + + if (options->stat_graph_width == -1) + options->stat_graph_width = diff_stat_graph_width; + + /* + * Guarantee 3/8*16==6 for the graph part + * and 5/8*16==10 for the filename part + */ + if (width < 16 + 6 + number_width) + width = 16 + 6 + number_width; + + /* + * First assign sizes that are wanted, ignoring available width. + * strlen("Bin XXX -> YYY bytes") == bin_width, and the part + * starting from "XXX" should fit in graph_width. + */ + graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4; + if (options->stat_graph_width && + options->stat_graph_width < graph_width) + graph_width = options->stat_graph_width; + + name_width = (options->stat_name_width > 0 && + options->stat_name_width < max_len) ? + options->stat_name_width : max_len; + + /* + * Adjust adjustable widths not to exceed maximum width + */ + if (name_width + number_width + 6 + graph_width > width) { + if (graph_width > width * 3/8 - number_width - 6) { + graph_width = width * 3/8 - number_width - 6; + if (graph_width < 6) + graph_width = 6; + } + + if (options->stat_graph_width && + graph_width > options->stat_graph_width) + graph_width = options->stat_graph_width; + if (name_width > width - number_width - 6 - graph_width) + name_width = width - number_width - 6 - graph_width; + else + graph_width = width - number_width - 6 - name_width; + } + + /* + * From here name_width is the width of the name area, + * and graph_width is the width of the graph area. + * max_change is used to scale graph properly. + */ + for (i = 0; i < count; i++) { + const char *prefix = ""; + struct diffstat_file *file = data->files[i]; + char *name = file->print_name; + uintmax_t added = file->added; + uintmax_t deleted = file->deleted; + int name_len; + + if (!file->is_interesting && (added + deleted == 0)) + continue; + + /* + * "scale" the filename + */ + len = name_width; + name_len = strlen(name); + if (name_width < name_len) { + char *slash; + prefix = "..."; + len -= 3; + name += name_len - len; + slash = strchr(name, '/'); + if (slash) + name = slash; + } + + if (file->is_binary) { + strbuf_addf(&out, " %s%-*s |", prefix, len, name); + strbuf_addf(&out, " %*s", number_width, "Bin"); + if (!added && !deleted) { + strbuf_addch(&out, '\n'); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE, + out.buf, out.len, 0); + strbuf_reset(&out); + continue; + } + strbuf_addf(&out, " %s%"PRIuMAX"%s", + del_c, deleted, reset); + strbuf_addstr(&out, " -> "); + strbuf_addf(&out, "%s%"PRIuMAX"%s", + add_c, added, reset); + strbuf_addstr(&out, " bytes\n"); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE, + out.buf, out.len, 0); + strbuf_reset(&out); + continue; + } + else if (file->is_unmerged) { + strbuf_addf(&out, " %s%-*s |", prefix, len, name); + strbuf_addstr(&out, " Unmerged\n"); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE, + out.buf, out.len, 0); + strbuf_reset(&out); + continue; + } + + /* + * scale the add/delete + */ + add = added; + del = deleted; + + if (graph_width <= max_change) { + int total = scale_linear(add + del, graph_width, max_change); + if (total < 2 && add && del) + /* width >= 2 due to the sanity check */ + total = 2; + if (add < del) { + add = scale_linear(add, graph_width, max_change); + del = total - add; + } else { + del = scale_linear(del, graph_width, max_change); + add = total - del; + } + } + strbuf_addf(&out, " %s%-*s |", prefix, len, name); + strbuf_addf(&out, " %*"PRIuMAX"%s", + number_width, added + deleted, + added + deleted ? " " : ""); + show_graph(&out, '+', add, add_c, reset); + show_graph(&out, '-', del, del_c, reset); + strbuf_addch(&out, '\n'); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE, + out.buf, out.len, 0); + strbuf_reset(&out); + } + + for (i = 0; i < data->nr; i++) { + struct diffstat_file *file = data->files[i]; + uintmax_t added = file->added; + uintmax_t deleted = file->deleted; + + if (file->is_unmerged || + (!file->is_interesting && (added + deleted == 0))) { + total_files--; + continue; + } + + if (!file->is_binary) { + adds += added; + dels += deleted; + } + if (i < count) + continue; + if (!extra_shown) + emit_diff_symbol(options, + DIFF_SYMBOL_STATS_SUMMARY_ABBREV, + NULL, 0, 0); + extra_shown = 1; + } + + print_stat_summary_inserts_deletes(options, total_files, adds, dels); + strbuf_release(&out); +} + +static void show_shortstats(struct diffstat_t *data, struct diff_options *options) +{ + int i, adds = 0, dels = 0, total_files = data->nr; + + if (data->nr == 0) + return; + + for (i = 0; i < data->nr; i++) { + int added = data->files[i]->added; + int deleted = data->files[i]->deleted; + + if (data->files[i]->is_unmerged || + (!data->files[i]->is_interesting && (added + deleted == 0))) { + total_files--; + } else if (!data->files[i]->is_binary) { /* don't count bytes */ + adds += added; + dels += deleted; + } + } + print_stat_summary_inserts_deletes(options, total_files, adds, dels); +} + +static void show_numstat(struct diffstat_t *data, struct diff_options *options) +{ + int i; + + if (data->nr == 0) + return; + + for (i = 0; i < data->nr; i++) { + struct diffstat_file *file = data->files[i]; + + fprintf(options->file, "%s", diff_line_prefix(options)); + + if (file->is_binary) + fprintf(options->file, "-\t-\t"); + else + fprintf(options->file, + "%"PRIuMAX"\t%"PRIuMAX"\t", + file->added, file->deleted); + if (options->line_termination) { + fill_print_name(file); + if (!file->is_renamed) + write_name_quoted(file->name, options->file, + options->line_termination); + else { + fputs(file->print_name, options->file); + putc(options->line_termination, options->file); + } + } else { + if (file->is_renamed) { + putc('\0', options->file); + write_name_quoted(file->from_name, options->file, '\0'); + } + write_name_quoted(file->name, options->file, '\0'); + } + } +} + +struct dirstat_file { + const char *name; + unsigned long changed; +}; + +struct dirstat_dir { + struct dirstat_file *files; + int alloc, nr, permille, cumulative; +}; + +static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir, + unsigned long changed, const char *base, int baselen) +{ + unsigned long this_dir = 0; + unsigned int sources = 0; + const char *line_prefix = diff_line_prefix(opt); + + while (dir->nr) { + struct dirstat_file *f = dir->files; + int namelen = strlen(f->name); + unsigned long this; + char *slash; + + if (namelen < baselen) + break; + if (memcmp(f->name, base, baselen)) + break; + slash = strchr(f->name + baselen, '/'); + if (slash) { + int newbaselen = slash + 1 - f->name; + this = gather_dirstat(opt, dir, changed, f->name, newbaselen); + sources++; + } else { + this = f->changed; + dir->files++; + dir->nr--; + sources += 2; + } + this_dir += this; + } + + /* + * We don't report dirstat's for + * - the top level + * - or cases where everything came from a single directory + * under this directory (sources == 1). + */ + if (baselen && sources != 1) { + if (this_dir) { + int permille = this_dir * 1000 / changed; + if (permille >= dir->permille) { + fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix, + permille / 10, permille % 10, baselen, base); + if (!dir->cumulative) + return 0; + } + } + } + return this_dir; +} + +static int dirstat_compare(const void *_a, const void *_b) +{ + const struct dirstat_file *a = _a; + const struct dirstat_file *b = _b; + return strcmp(a->name, b->name); +} + +static void show_dirstat(struct diff_options *options) +{ + int i; + unsigned long changed; + struct dirstat_dir dir; + struct diff_queue_struct *q = &diff_queued_diff; + + dir.files = NULL; + dir.alloc = 0; + dir.nr = 0; + dir.permille = options->dirstat_permille; + dir.cumulative = options->flags.dirstat_cumulative; + + changed = 0; + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + const char *name; + unsigned long copied, added, damage; + int content_changed; + + name = p->two->path ? p->two->path : p->one->path; + + if (p->one->oid_valid && p->two->oid_valid) + content_changed = oidcmp(&p->one->oid, &p->two->oid); + else + content_changed = 1; + + if (!content_changed) { + /* + * The SHA1 has not changed, so pre-/post-content is + * identical. We can therefore skip looking at the + * file contents altogether. + */ + damage = 0; + goto found_damage; + } + + if (options->flags.dirstat_by_file) { + /* + * In --dirstat-by-file mode, we don't really need to + * look at the actual file contents at all. + * The fact that the SHA1 changed is enough for us to + * add this file to the list of results + * (with each file contributing equal damage). + */ + damage = 1; + goto found_damage; + } + + if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) { + diff_populate_filespec(p->one, 0); + diff_populate_filespec(p->two, 0); + diffcore_count_changes(p->one, p->two, NULL, NULL, + &copied, &added); + diff_free_filespec_data(p->one); + diff_free_filespec_data(p->two); + } else if (DIFF_FILE_VALID(p->one)) { + diff_populate_filespec(p->one, CHECK_SIZE_ONLY); + copied = added = 0; + diff_free_filespec_data(p->one); + } else if (DIFF_FILE_VALID(p->two)) { + diff_populate_filespec(p->two, CHECK_SIZE_ONLY); + copied = 0; + added = p->two->size; + diff_free_filespec_data(p->two); + } else + continue; + + /* + * Original minus copied is the removed material, + * added is the new material. They are both damages + * made to the preimage. + * If the resulting damage is zero, we know that + * diffcore_count_changes() considers the two entries to + * be identical, but since content_changed is true, we + * know that there must have been _some_ kind of change, + * so we force all entries to have damage > 0. + */ + damage = (p->one->size - copied) + added; + if (!damage) + damage = 1; + +found_damage: + ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc); + dir.files[dir.nr].name = name; + dir.files[dir.nr].changed = damage; + changed += damage; + dir.nr++; + } + + /* This can happen even with many files, if everything was renames */ + if (!changed) + return; + + /* Show all directories with more than x% of the changes */ + QSORT(dir.files, dir.nr, dirstat_compare); + gather_dirstat(options, &dir, changed, "", 0); +} + +static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options) +{ + int i; + unsigned long changed; + struct dirstat_dir dir; + + if (data->nr == 0) + return; + + dir.files = NULL; + dir.alloc = 0; + dir.nr = 0; + dir.permille = options->dirstat_permille; + dir.cumulative = options->flags.dirstat_cumulative; + + changed = 0; + for (i = 0; i < data->nr; i++) { + struct diffstat_file *file = data->files[i]; + unsigned long damage = file->added + file->deleted; + if (file->is_binary) + /* + * binary files counts bytes, not lines. Must find some + * way to normalize binary bytes vs. textual lines. + * The following heuristic assumes that there are 64 + * bytes per "line". + * This is stupid and ugly, but very cheap... + */ + damage = DIV_ROUND_UP(damage, 64); + ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc); + dir.files[dir.nr].name = file->name; + dir.files[dir.nr].changed = damage; + changed += damage; + dir.nr++; + } + + /* This can happen even with many files, if everything was renames */ + if (!changed) + return; + + /* Show all directories with more than x% of the changes */ + QSORT(dir.files, dir.nr, dirstat_compare); + gather_dirstat(options, &dir, changed, "", 0); +} + +static void free_diffstat_info(struct diffstat_t *diffstat) +{ + int i; + for (i = 0; i < diffstat->nr; i++) { + struct diffstat_file *f = diffstat->files[i]; + if (f->name != f->print_name) + free(f->print_name); + free(f->name); + free(f->from_name); + free(f); + } + free(diffstat->files); +} + +struct checkdiff_t { + const char *filename; + int lineno; + int conflict_marker_size; + struct diff_options *o; + unsigned ws_rule; + unsigned status; +}; + +static int is_conflict_marker(const char *line, int marker_size, unsigned long len) +{ + char firstchar; + int cnt; + + if (len < marker_size + 1) + return 0; + firstchar = line[0]; + switch (firstchar) { + case '=': case '>': case '<': case '|': + break; + default: + return 0; + } + for (cnt = 1; cnt < marker_size; cnt++) + if (line[cnt] != firstchar) + return 0; + /* line[1] thru line[marker_size-1] are same as firstchar */ + if (len < marker_size + 1 || !isspace(line[marker_size])) + return 0; + return 1; +} + +static void checkdiff_consume(void *priv, char *line, unsigned long len) +{ + struct checkdiff_t *data = priv; + int marker_size = data->conflict_marker_size; + const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE); + const char *reset = diff_get_color(data->o->use_color, DIFF_RESET); + const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW); + char *err; + const char *line_prefix; + + assert(data->o); + line_prefix = diff_line_prefix(data->o); + + if (line[0] == '+') { + unsigned bad; + data->lineno++; + if (is_conflict_marker(line + 1, marker_size, len - 1)) { + data->status |= 1; + fprintf(data->o->file, + "%s%s:%d: leftover conflict marker\n", + line_prefix, data->filename, data->lineno); + } + bad = ws_check(line + 1, len - 1, data->ws_rule); + if (!bad) + return; + data->status |= bad; + err = whitespace_error_string(bad); + fprintf(data->o->file, "%s%s:%d: %s.\n", + line_prefix, data->filename, data->lineno, err); + free(err); + emit_line(data->o, set, reset, line, 1); + ws_check_emit(line + 1, len - 1, data->ws_rule, + data->o->file, set, reset, ws); + } else if (line[0] == ' ') { + data->lineno++; + } else if (line[0] == '@') { + char *plus = strchr(line, '+'); + if (plus) + data->lineno = strtol(plus, NULL, 10) - 1; + else + die("invalid diff"); + } +} + +static unsigned char *deflate_it(char *data, + unsigned long size, + unsigned long *result_size) +{ + int bound; + unsigned char *deflated; + git_zstream stream; + + git_deflate_init(&stream, zlib_compression_level); + bound = git_deflate_bound(&stream, size); + deflated = xmalloc(bound); + stream.next_out = deflated; + stream.avail_out = bound; + + stream.next_in = (unsigned char *)data; + stream.avail_in = size; + while (git_deflate(&stream, Z_FINISH) == Z_OK) + ; /* nothing */ + git_deflate_end(&stream); + *result_size = stream.total_out; + return deflated; +} + +static void emit_binary_diff_body(struct diff_options *o, + mmfile_t *one, mmfile_t *two) +{ + void *cp; + void *delta; + void *deflated; + void *data; + unsigned long orig_size; + unsigned long delta_size; + unsigned long deflate_size; + unsigned long data_size; + + /* We could do deflated delta, or we could do just deflated two, + * whichever is smaller. + */ + delta = NULL; + deflated = deflate_it(two->ptr, two->size, &deflate_size); + if (one->size && two->size) { + delta = diff_delta(one->ptr, one->size, + two->ptr, two->size, + &delta_size, deflate_size); + if (delta) { + void *to_free = delta; + orig_size = delta_size; + delta = deflate_it(delta, delta_size, &delta_size); + free(to_free); + } + } + + if (delta && delta_size < deflate_size) { + char *s = xstrfmt("%lu", orig_size); + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA, + s, strlen(s), 0); + free(s); + free(deflated); + data = delta; + data_size = delta_size; + } else { + char *s = xstrfmt("%lu", two->size); + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL, + s, strlen(s), 0); + free(s); + free(delta); + data = deflated; + data_size = deflate_size; + } + + /* emit data encoded in base85 */ + cp = data; + while (data_size) { + int len; + int bytes = (52 < data_size) ? 52 : data_size; + char line[71]; + data_size -= bytes; + if (bytes <= 26) + line[0] = bytes + 'A' - 1; + else + line[0] = bytes - 26 + 'a' - 1; + encode_85(line + 1, cp, bytes); + cp = (char *) cp + bytes; + + len = strlen(line); + line[len++] = '\n'; + line[len] = '\0'; + + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY, + line, len, 0); + } + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0); + free(data); +} + +static void emit_binary_diff(struct diff_options *o, + mmfile_t *one, mmfile_t *two) +{ + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0); + emit_binary_diff_body(o, one, two); + emit_binary_diff_body(o, two, one); +} + +int diff_filespec_is_binary(struct diff_filespec *one) +{ + if (one->is_binary == -1) { + diff_filespec_load_driver(one); + if (one->driver->binary != -1) + one->is_binary = one->driver->binary; + else { + if (!one->data && DIFF_FILE_VALID(one)) + diff_populate_filespec(one, CHECK_BINARY); + if (one->is_binary == -1 && one->data) + one->is_binary = buffer_is_binary(one->data, + one->size); + if (one->is_binary == -1) + one->is_binary = 0; + } + } + return one->is_binary; +} + +static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one) +{ + diff_filespec_load_driver(one); + return one->driver->funcname.pattern ? &one->driver->funcname : NULL; +} + +void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b) +{ + if (!options->a_prefix) + options->a_prefix = a; + if (!options->b_prefix) + options->b_prefix = b; +} + +struct userdiff_driver *get_textconv(struct diff_filespec *one) +{ + if (!DIFF_FILE_VALID(one)) + return NULL; + + diff_filespec_load_driver(one); + return userdiff_get_textconv(one->driver); +} + +static void builtin_diff(const char *name_a, + const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + const char *xfrm_msg, + int must_show_header, + struct diff_options *o, + int complete_rewrite) +{ + mmfile_t mf1, mf2; + const char *lbl[2]; + char *a_one, *b_two; + const char *meta = diff_get_color_opt(o, DIFF_METAINFO); + const char *reset = diff_get_color_opt(o, DIFF_RESET); + const char *a_prefix, *b_prefix; + struct userdiff_driver *textconv_one = NULL; + struct userdiff_driver *textconv_two = NULL; + struct strbuf header = STRBUF_INIT; + const char *line_prefix = diff_line_prefix(o); + + diff_set_mnemonic_prefix(o, "a/", "b/"); + if (o->flags.reverse_diff) { + a_prefix = o->b_prefix; + b_prefix = o->a_prefix; + } else { + a_prefix = o->a_prefix; + b_prefix = o->b_prefix; + } + + if (o->submodule_format == DIFF_SUBMODULE_LOG && + (!one->mode || S_ISGITLINK(one->mode)) && + (!two->mode || S_ISGITLINK(two->mode))) { + show_submodule_summary(o, one->path ? one->path : two->path, + &one->oid, &two->oid, + two->dirty_submodule); + return; + } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF && + (!one->mode || S_ISGITLINK(one->mode)) && + (!two->mode || S_ISGITLINK(two->mode))) { + show_submodule_inline_diff(o, one->path ? one->path : two->path, + &one->oid, &two->oid, + two->dirty_submodule); + return; + } + + if (o->flags.allow_textconv) { + textconv_one = get_textconv(one); + textconv_two = get_textconv(two); + } + + /* Never use a non-valid filename anywhere if at all possible */ + name_a = DIFF_FILE_VALID(one) ? name_a : name_b; + name_b = DIFF_FILE_VALID(two) ? name_b : name_a; + + a_one = quote_two(a_prefix, name_a + (*name_a == '/')); + b_two = quote_two(b_prefix, name_b + (*name_b == '/')); + lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null"; + lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null"; + strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset); + if (lbl[0][0] == '/') { + /* /dev/null */ + strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset); + if (xfrm_msg) + strbuf_addstr(&header, xfrm_msg); + must_show_header = 1; + } + else if (lbl[1][0] == '/') { + strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset); + if (xfrm_msg) + strbuf_addstr(&header, xfrm_msg); + must_show_header = 1; + } + else { + if (one->mode != two->mode) { + strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset); + strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset); + must_show_header = 1; + } + if (xfrm_msg) + strbuf_addstr(&header, xfrm_msg); + + /* + * we do not run diff between different kind + * of objects. + */ + if ((one->mode ^ two->mode) & S_IFMT) + goto free_ab_and_return; + if (complete_rewrite && + (textconv_one || !diff_filespec_is_binary(one)) && + (textconv_two || !diff_filespec_is_binary(two))) { + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + header.buf, header.len, 0); + strbuf_reset(&header); + emit_rewrite_diff(name_a, name_b, one, two, + textconv_one, textconv_two, o); + o->found_changes = 1; + goto free_ab_and_return; + } + } + + if (o->irreversible_delete && lbl[1][0] == '/') { + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, + header.len, 0); + strbuf_reset(&header); + goto free_ab_and_return; + } else if (!o->flags.text && + ( (!textconv_one && diff_filespec_is_binary(one)) || + (!textconv_two && diff_filespec_is_binary(two)) )) { + struct strbuf sb = STRBUF_INIT; + if (!one->data && !two->data && + S_ISREG(one->mode) && S_ISREG(two->mode) && + !o->flags.binary) { + if (!oidcmp(&one->oid, &two->oid)) { + if (must_show_header) + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + header.buf, header.len, + 0); + goto free_ab_and_return; + } + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + header.buf, header.len, 0); + strbuf_addf(&sb, "%sBinary files %s and %s differ\n", + diff_line_prefix(o), lbl[0], lbl[1]); + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES, + sb.buf, sb.len, 0); + strbuf_release(&sb); + goto free_ab_and_return; + } + if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) + die("unable to read files to diff"); + /* Quite common confusing case */ + if (mf1.size == mf2.size && + !memcmp(mf1.ptr, mf2.ptr, mf1.size)) { + if (must_show_header) + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + header.buf, header.len, 0); + goto free_ab_and_return; + } + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0); + strbuf_reset(&header); + if (o->flags.binary) + emit_binary_diff(o, &mf1, &mf2); + else { + strbuf_addf(&sb, "%sBinary files %s and %s differ\n", + diff_line_prefix(o), lbl[0], lbl[1]); + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES, + sb.buf, sb.len, 0); + strbuf_release(&sb); + } + o->found_changes = 1; + } else { + /* Crazy xdl interfaces.. */ + const char *diffopts = getenv("GIT_DIFF_OPTS"); + const char *v; + xpparam_t xpp; + xdemitconf_t xecfg; + struct emit_callback ecbdata; + const struct userdiff_funcname *pe; + + if (must_show_header) { + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + header.buf, header.len, 0); + strbuf_reset(&header); + } + + mf1.size = fill_textconv(textconv_one, one, &mf1.ptr); + mf2.size = fill_textconv(textconv_two, two, &mf2.ptr); + + pe = diff_funcname_pattern(one); + if (!pe) + pe = diff_funcname_pattern(two); + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + memset(&ecbdata, 0, sizeof(ecbdata)); + ecbdata.label_path = lbl; + ecbdata.color_diff = want_color(o->use_color); + ecbdata.ws_rule = whitespace_rule(name_b); + if (ecbdata.ws_rule & WS_BLANK_AT_EOF) + check_blank_at_eof(&mf1, &mf2, &ecbdata); + ecbdata.opt = o; + ecbdata.header = header.len ? &header : NULL; + xpp.flags = o->xdl_opts; + xpp.anchors = o->anchors; + xpp.anchors_nr = o->anchors_nr; + xecfg.ctxlen = o->context; + xecfg.interhunkctxlen = o->interhunkcontext; + xecfg.flags = XDL_EMIT_FUNCNAMES; + if (o->flags.funccontext) + xecfg.flags |= XDL_EMIT_FUNCCONTEXT; + if (pe) + xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags); + if (!diffopts) + ; + else if (skip_prefix(diffopts, "--unified=", &v)) + xecfg.ctxlen = strtoul(v, NULL, 10); + else if (skip_prefix(diffopts, "-u", &v)) + xecfg.ctxlen = strtoul(v, NULL, 10); + if (o->word_diff) + init_diff_words_data(&ecbdata, o, one, two); + if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata, + &xpp, &xecfg)) + die("unable to generate diff for %s", one->path); + if (o->word_diff) + free_diff_words_data(&ecbdata); + if (textconv_one) + free(mf1.ptr); + if (textconv_two) + free(mf2.ptr); + xdiff_clear_find_func(&xecfg); + } + + free_ab_and_return: + strbuf_release(&header); + diff_free_filespec_data(one); + diff_free_filespec_data(two); + free(a_one); + free(b_two); + return; +} + +static void builtin_diffstat(const char *name_a, const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + struct diffstat_t *diffstat, + struct diff_options *o, + struct diff_filepair *p) +{ + mmfile_t mf1, mf2; + struct diffstat_file *data; + int same_contents; + int complete_rewrite = 0; + + if (!DIFF_PAIR_UNMERGED(p)) { + if (p->status == DIFF_STATUS_MODIFIED && p->score) + complete_rewrite = 1; + } + + data = diffstat_add(diffstat, name_a, name_b); + data->is_interesting = p->status != DIFF_STATUS_UNKNOWN; + + if (!one || !two) { + data->is_unmerged = 1; + return; + } + + same_contents = !oidcmp(&one->oid, &two->oid); + + if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) { + data->is_binary = 1; + if (same_contents) { + data->added = 0; + data->deleted = 0; + } else { + data->added = diff_filespec_size(two); + data->deleted = diff_filespec_size(one); + } + } + + else if (complete_rewrite) { + diff_populate_filespec(one, 0); + diff_populate_filespec(two, 0); + data->deleted = count_lines(one->data, one->size); + data->added = count_lines(two->data, two->size); + } + + else if (!same_contents) { + /* Crazy xdl interfaces.. */ + xpparam_t xpp; + xdemitconf_t xecfg; + + if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) + die("unable to read files to diff"); + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + xpp.flags = o->xdl_opts; + xpp.anchors = o->anchors; + xpp.anchors_nr = o->anchors_nr; + xecfg.ctxlen = o->context; + xecfg.interhunkctxlen = o->interhunkcontext; + if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat, + &xpp, &xecfg)) + die("unable to generate diffstat for %s", one->path); + } + + diff_free_filespec_data(one); + diff_free_filespec_data(two); +} + +static void builtin_checkdiff(const char *name_a, const char *name_b, + const char *attr_path, + struct diff_filespec *one, + struct diff_filespec *two, + struct diff_options *o) +{ + mmfile_t mf1, mf2; + struct checkdiff_t data; + + if (!two) + return; + + memset(&data, 0, sizeof(data)); + data.filename = name_b ? name_b : name_a; + data.lineno = 0; + data.o = o; + data.ws_rule = whitespace_rule(attr_path); + data.conflict_marker_size = ll_merge_marker_size(attr_path); + + if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) + die("unable to read files to diff"); + + /* + * All the other codepaths check both sides, but not checking + * the "old" side here is deliberate. We are checking the newly + * introduced changes, and as long as the "new" side is text, we + * can and should check what it introduces. + */ + if (diff_filespec_is_binary(two)) + goto free_and_return; + else { + /* Crazy xdl interfaces.. */ + xpparam_t xpp; + xdemitconf_t xecfg; + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + xecfg.ctxlen = 1; /* at least one context line */ + xpp.flags = 0; + if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data, + &xpp, &xecfg)) + die("unable to generate checkdiff for %s", one->path); + + if (data.ws_rule & WS_BLANK_AT_EOF) { + struct emit_callback ecbdata; + int blank_at_eof; + + ecbdata.ws_rule = data.ws_rule; + check_blank_at_eof(&mf1, &mf2, &ecbdata); + blank_at_eof = ecbdata.blank_at_eof_in_postimage; + + if (blank_at_eof) { + static char *err; + if (!err) + err = whitespace_error_string(WS_BLANK_AT_EOF); + fprintf(o->file, "%s:%d: %s.\n", + data.filename, blank_at_eof, err); + data.status = 1; /* report errors */ + } + } + } + free_and_return: + diff_free_filespec_data(one); + diff_free_filespec_data(two); + if (data.status) + o->flags.check_failed = 1; +} + +struct diff_filespec *alloc_filespec(const char *path) +{ + struct diff_filespec *spec; + + FLEXPTR_ALLOC_STR(spec, path, path); + spec->count = 1; + spec->is_binary = -1; + return spec; +} + +void free_filespec(struct diff_filespec *spec) +{ + if (!--spec->count) { + diff_free_filespec_data(spec); + free(spec); + } +} + +void fill_filespec(struct diff_filespec *spec, const struct object_id *oid, + int oid_valid, unsigned short mode) +{ + if (mode) { + spec->mode = canon_mode(mode); + oidcpy(&spec->oid, oid); + spec->oid_valid = oid_valid; + } +} + +/* + * Given a name and sha1 pair, if the index tells us the file in + * the work tree has that object contents, return true, so that + * prepare_temp_file() does not have to inflate and extract. + */ +static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file) +{ + const struct cache_entry *ce; + struct stat st; + int pos, len; + + /* + * We do not read the cache ourselves here, because the + * benchmark with my previous version that always reads cache + * shows that it makes things worse for diff-tree comparing + * two linux-2.6 kernel trees in an already checked out work + * tree. This is because most diff-tree comparisons deal with + * only a small number of files, while reading the cache is + * expensive for a large project, and its cost outweighs the + * savings we get by not inflating the object to a temporary + * file. Practically, this code only helps when we are used + * by diff-cache --cached, which does read the cache before + * calling us. + */ + if (!active_cache) + return 0; + + /* We want to avoid the working directory if our caller + * doesn't need the data in a normal file, this system + * is rather slow with its stat/open/mmap/close syscalls, + * and the object is contained in a pack file. The pack + * is probably already open and will be faster to obtain + * the data through than the working directory. Loose + * objects however would tend to be slower as they need + * to be individually opened and inflated. + */ + if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(oid->hash)) + return 0; + + /* + * Similarly, if we'd have to convert the file contents anyway, that + * makes the optimization not worthwhile. + */ + if (!want_file && would_convert_to_git(&the_index, name)) + return 0; + + len = strlen(name); + pos = cache_name_pos(name, len); + if (pos < 0) + return 0; + ce = active_cache[pos]; + + /* + * This is not the sha1 we are looking for, or + * unreusable because it is not a regular file. + */ + if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode)) + return 0; + + /* + * If ce is marked as "assume unchanged", there is no + * guarantee that work tree matches what we are looking for. + */ + if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) + return 0; + + /* + * If ce matches the file in the work tree, we can reuse it. + */ + if (ce_uptodate(ce) || + (!lstat(name, &st) && !ce_match_stat(ce, &st, 0))) + return 1; + + return 0; +} + +static int diff_populate_gitlink(struct diff_filespec *s, int size_only) +{ + struct strbuf buf = STRBUF_INIT; + char *dirty = ""; + + /* Are we looking at the work tree? */ + if (s->dirty_submodule) + dirty = "-dirty"; + + strbuf_addf(&buf, "Subproject commit %s%s\n", + oid_to_hex(&s->oid), dirty); + s->size = buf.len; + if (size_only) { + s->data = NULL; + strbuf_release(&buf); + } else { + s->data = strbuf_detach(&buf, NULL); + s->should_free = 1; + } + return 0; +} + +/* + * While doing rename detection and pickaxe operation, we may need to + * grab the data for the blob (or file) for our own in-core comparison. + * diff_filespec has data and size fields for this purpose. + */ +int diff_populate_filespec(struct diff_filespec *s, unsigned int flags) +{ + int size_only = flags & CHECK_SIZE_ONLY; + int err = 0; + int conv_flags = global_conv_flags_eol; + /* + * demote FAIL to WARN to allow inspecting the situation + * instead of refusing. + */ + if (conv_flags & CONV_EOL_RNDTRP_DIE) + conv_flags = CONV_EOL_RNDTRP_WARN; + + if (!DIFF_FILE_VALID(s)) + die("internal error: asking to populate invalid file."); + if (S_ISDIR(s->mode)) + return -1; + + if (s->data) + return 0; + + if (size_only && 0 < s->size) + return 0; + + if (S_ISGITLINK(s->mode)) + return diff_populate_gitlink(s, size_only); + + if (!s->oid_valid || + reuse_worktree_file(s->path, &s->oid, 0)) { + struct strbuf buf = STRBUF_INIT; + struct stat st; + int fd; + + if (lstat(s->path, &st) < 0) { + err_empty: + err = -1; + empty: + s->data = (char *)""; + s->size = 0; + return err; + } + s->size = xsize_t(st.st_size); + if (!s->size) + goto empty; + if (S_ISLNK(st.st_mode)) { + struct strbuf sb = STRBUF_INIT; + + if (strbuf_readlink(&sb, s->path, s->size)) + goto err_empty; + s->size = sb.len; + s->data = strbuf_detach(&sb, NULL); + s->should_free = 1; + return 0; + } + + /* + * Even if the caller would be happy with getting + * only the size, we cannot return early at this + * point if the path requires us to run the content + * conversion. + */ + if (size_only && !would_convert_to_git(&the_index, s->path)) + return 0; + + /* + * Note: this check uses xsize_t(st.st_size) that may + * not be the true size of the blob after it goes + * through convert_to_git(). This may not strictly be + * correct, but the whole point of big_file_threshold + * and is_binary check being that we want to avoid + * opening the file and inspecting the contents, this + * is probably fine. + */ + if ((flags & CHECK_BINARY) && + s->size > big_file_threshold && s->is_binary == -1) { + s->is_binary = 1; + return 0; + } + fd = open(s->path, O_RDONLY); + if (fd < 0) + goto err_empty; + s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0); + close(fd); + s->should_munmap = 1; + + /* + * Convert from working tree format to canonical git format + */ + if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, conv_flags)) { + size_t size = 0; + munmap(s->data, s->size); + s->should_munmap = 0; + s->data = strbuf_detach(&buf, &size); + s->size = size; + s->should_free = 1; + } + } + else { + enum object_type type; + if (size_only || (flags & CHECK_BINARY)) { + type = sha1_object_info(s->oid.hash, &s->size); + if (type < 0) + die("unable to read %s", + oid_to_hex(&s->oid)); + if (size_only) + return 0; + if (s->size > big_file_threshold && s->is_binary == -1) { + s->is_binary = 1; + return 0; + } + } + s->data = read_sha1_file(s->oid.hash, &type, &s->size); + if (!s->data) + die("unable to read %s", oid_to_hex(&s->oid)); + s->should_free = 1; + } + return 0; +} + +void diff_free_filespec_blob(struct diff_filespec *s) +{ + if (s->should_free) + free(s->data); + else if (s->should_munmap) + munmap(s->data, s->size); + + if (s->should_free || s->should_munmap) { + s->should_free = s->should_munmap = 0; + s->data = NULL; + } +} + +void diff_free_filespec_data(struct diff_filespec *s) +{ + diff_free_filespec_blob(s); + FREE_AND_NULL(s->cnt_data); +} + +static void prep_temp_blob(const char *path, struct diff_tempfile *temp, + void *blob, + unsigned long size, + const struct object_id *oid, + int mode) +{ + struct strbuf buf = STRBUF_INIT; + struct strbuf template = STRBUF_INIT; + char *path_dup = xstrdup(path); + const char *base = basename(path_dup); + + /* Generate "XXXXXX_basename.ext" */ + strbuf_addstr(&template, "XXXXXX_"); + strbuf_addstr(&template, base); + + temp->tempfile = mks_tempfile_ts(template.buf, strlen(base) + 1); + if (!temp->tempfile) + die_errno("unable to create temp-file"); + if (convert_to_working_tree(path, + (const char *)blob, (size_t)size, &buf)) { + blob = buf.buf; + size = buf.len; + } + if (write_in_full(temp->tempfile->fd, blob, size) < 0 || + close_tempfile_gently(temp->tempfile)) + die_errno("unable to write temp-file"); + temp->name = get_tempfile_path(temp->tempfile); + oid_to_hex_r(temp->hex, oid); + xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode); + strbuf_release(&buf); + strbuf_release(&template); + free(path_dup); +} + +static struct diff_tempfile *prepare_temp_file(const char *name, + struct diff_filespec *one) +{ + struct diff_tempfile *temp = claim_diff_tempfile(); + + if (!DIFF_FILE_VALID(one)) { + not_a_valid_file: + /* A '-' entry produces this for file-2, and + * a '+' entry produces this for file-1. + */ + temp->name = "/dev/null"; + xsnprintf(temp->hex, sizeof(temp->hex), "."); + xsnprintf(temp->mode, sizeof(temp->mode), "."); + return temp; + } + + if (!S_ISGITLINK(one->mode) && + (!one->oid_valid || + reuse_worktree_file(name, &one->oid, 1))) { + struct stat st; + if (lstat(name, &st) < 0) { + if (errno == ENOENT) + goto not_a_valid_file; + die_errno("stat(%s)", name); + } + if (S_ISLNK(st.st_mode)) { + struct strbuf sb = STRBUF_INIT; + if (strbuf_readlink(&sb, name, st.st_size) < 0) + die_errno("readlink(%s)", name); + prep_temp_blob(name, temp, sb.buf, sb.len, + (one->oid_valid ? + &one->oid : &null_oid), + (one->oid_valid ? + one->mode : S_IFLNK)); + strbuf_release(&sb); + } + else { + /* we can borrow from the file in the work tree */ + temp->name = name; + if (!one->oid_valid) + oid_to_hex_r(temp->hex, &null_oid); + else + oid_to_hex_r(temp->hex, &one->oid); + /* Even though we may sometimes borrow the + * contents from the work tree, we always want + * one->mode. mode is trustworthy even when + * !(one->oid_valid), as long as + * DIFF_FILE_VALID(one). + */ + xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode); + } + return temp; + } + else { + if (diff_populate_filespec(one, 0)) + die("cannot read data blob for %s", one->path); + prep_temp_blob(name, temp, one->data, one->size, + &one->oid, one->mode); + } + return temp; +} + +static void add_external_diff_name(struct argv_array *argv, + const char *name, + struct diff_filespec *df) +{ + struct diff_tempfile *temp = prepare_temp_file(name, df); + argv_array_push(argv, temp->name); + argv_array_push(argv, temp->hex); + argv_array_push(argv, temp->mode); +} + +/* An external diff command takes: + * + * diff-cmd name infile1 infile1-sha1 infile1-mode \ + * infile2 infile2-sha1 infile2-mode [ rename-to ] + * + */ +static void run_external_diff(const char *pgm, + const char *name, + const char *other, + struct diff_filespec *one, + struct diff_filespec *two, + const char *xfrm_msg, + int complete_rewrite, + struct diff_options *o) +{ + struct argv_array argv = ARGV_ARRAY_INIT; + struct argv_array env = ARGV_ARRAY_INIT; + struct diff_queue_struct *q = &diff_queued_diff; + + argv_array_push(&argv, pgm); + argv_array_push(&argv, name); + + if (one && two) { + add_external_diff_name(&argv, name, one); + if (!other) + add_external_diff_name(&argv, name, two); + else { + add_external_diff_name(&argv, other, two); + argv_array_push(&argv, other); + argv_array_push(&argv, xfrm_msg); + } + } + + argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter); + argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr); + + if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv)) + die(_("external diff died, stopping at %s"), name); + + remove_tempfile(); + argv_array_clear(&argv); + argv_array_clear(&env); +} + +static int similarity_index(struct diff_filepair *p) +{ + return p->score * 100 / MAX_SCORE; +} + +static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev) +{ + if (startup_info->have_repository) + return find_unique_abbrev(oid->hash, abbrev); + else { + char *hex = oid_to_hex(oid); + if (abbrev < 0) + abbrev = FALLBACK_DEFAULT_ABBREV; + if (abbrev > GIT_SHA1_HEXSZ) + die("BUG: oid abbreviation out of range: %d", abbrev); + if (abbrev) + hex[abbrev] = '\0'; + return hex; + } +} + +static void fill_metainfo(struct strbuf *msg, + const char *name, + const char *other, + struct diff_filespec *one, + struct diff_filespec *two, + struct diff_options *o, + struct diff_filepair *p, + int *must_show_header, + int use_color) +{ + const char *set = diff_get_color(use_color, DIFF_METAINFO); + const char *reset = diff_get_color(use_color, DIFF_RESET); + const char *line_prefix = diff_line_prefix(o); + + *must_show_header = 1; + strbuf_init(msg, PATH_MAX * 2 + 300); + switch (p->status) { + case DIFF_STATUS_COPIED: + strbuf_addf(msg, "%s%ssimilarity index %d%%", + line_prefix, set, similarity_index(p)); + strbuf_addf(msg, "%s\n%s%scopy from ", + reset, line_prefix, set); + quote_c_style(name, msg, NULL, 0); + strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set); + quote_c_style(other, msg, NULL, 0); + strbuf_addf(msg, "%s\n", reset); + break; + case DIFF_STATUS_RENAMED: + strbuf_addf(msg, "%s%ssimilarity index %d%%", + line_prefix, set, similarity_index(p)); + strbuf_addf(msg, "%s\n%s%srename from ", + reset, line_prefix, set); + quote_c_style(name, msg, NULL, 0); + strbuf_addf(msg, "%s\n%s%srename to ", + reset, line_prefix, set); + quote_c_style(other, msg, NULL, 0); + strbuf_addf(msg, "%s\n", reset); + break; + case DIFF_STATUS_MODIFIED: + if (p->score) { + strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n", + line_prefix, + set, similarity_index(p), reset); + break; + } + /* fallthru */ + default: + *must_show_header = 0; + } + if (one && two && oidcmp(&one->oid, &two->oid)) { + int abbrev = o->flags.full_index ? 40 : DEFAULT_ABBREV; + + if (o->flags.binary) { + mmfile_t mf; + if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) || + (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two))) + abbrev = 40; + } + strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set, + diff_abbrev_oid(&one->oid, abbrev), + diff_abbrev_oid(&two->oid, abbrev)); + if (one->mode == two->mode) + strbuf_addf(msg, " %06o", one->mode); + strbuf_addf(msg, "%s\n", reset); + } +} + +static void run_diff_cmd(const char *pgm, + const char *name, + const char *other, + const char *attr_path, + struct diff_filespec *one, + struct diff_filespec *two, + struct strbuf *msg, + struct diff_options *o, + struct diff_filepair *p) +{ + const char *xfrm_msg = NULL; + int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score; + int must_show_header = 0; + + + if (o->flags.allow_external) { + struct userdiff_driver *drv = userdiff_find_by_path(attr_path); + if (drv && drv->external) + pgm = drv->external; + } + + if (msg) { + /* + * don't use colors when the header is intended for an + * external diff driver + */ + fill_metainfo(msg, name, other, one, two, o, p, + &must_show_header, + want_color(o->use_color) && !pgm); + xfrm_msg = msg->len ? msg->buf : NULL; + } + + if (pgm) { + run_external_diff(pgm, name, other, one, two, xfrm_msg, + complete_rewrite, o); + return; + } + if (one && two) + builtin_diff(name, other ? other : name, + one, two, xfrm_msg, must_show_header, + o, complete_rewrite); + else + fprintf(o->file, "* Unmerged path %s\n", name); +} + +static void diff_fill_oid_info(struct diff_filespec *one) +{ + if (DIFF_FILE_VALID(one)) { + if (!one->oid_valid) { + struct stat st; + if (one->is_stdin) { + oidclr(&one->oid); + return; + } + if (lstat(one->path, &st) < 0) + die_errno("stat '%s'", one->path); + if (index_path(&one->oid, one->path, &st, 0)) + die("cannot hash %s", one->path); + } + } + else + oidclr(&one->oid); +} + +static void strip_prefix(int prefix_length, const char **namep, const char **otherp) +{ + /* Strip the prefix but do not molest /dev/null and absolute paths */ + if (*namep && **namep != '/') { + *namep += prefix_length; + if (**namep == '/') + ++*namep; + } + if (*otherp && **otherp != '/') { + *otherp += prefix_length; + if (**otherp == '/') + ++*otherp; + } +} + +static void run_diff(struct diff_filepair *p, struct diff_options *o) +{ + const char *pgm = external_diff(); + struct strbuf msg; + struct diff_filespec *one = p->one; + struct diff_filespec *two = p->two; + const char *name; + const char *other; + const char *attr_path; + + name = one->path; + other = (strcmp(name, two->path) ? two->path : NULL); + attr_path = name; + if (o->prefix_length) + strip_prefix(o->prefix_length, &name, &other); + + if (!o->flags.allow_external) + pgm = NULL; + + if (DIFF_PAIR_UNMERGED(p)) { + run_diff_cmd(pgm, name, NULL, attr_path, + NULL, NULL, NULL, o, p); + return; + } + + diff_fill_oid_info(one); + diff_fill_oid_info(two); + + if (!pgm && + DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) && + (S_IFMT & one->mode) != (S_IFMT & two->mode)) { + /* + * a filepair that changes between file and symlink + * needs to be split into deletion and creation. + */ + struct diff_filespec *null = alloc_filespec(two->path); + run_diff_cmd(NULL, name, other, attr_path, + one, null, &msg, o, p); + free(null); + strbuf_release(&msg); + + null = alloc_filespec(one->path); + run_diff_cmd(NULL, name, other, attr_path, + null, two, &msg, o, p); + free(null); + } + else + run_diff_cmd(pgm, name, other, attr_path, + one, two, &msg, o, p); + + strbuf_release(&msg); +} + +static void run_diffstat(struct diff_filepair *p, struct diff_options *o, + struct diffstat_t *diffstat) +{ + const char *name; + const char *other; + + if (DIFF_PAIR_UNMERGED(p)) { + /* unmerged */ + builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p); + return; + } + + name = p->one->path; + other = (strcmp(name, p->two->path) ? p->two->path : NULL); + + if (o->prefix_length) + strip_prefix(o->prefix_length, &name, &other); + + diff_fill_oid_info(p->one); + diff_fill_oid_info(p->two); + + builtin_diffstat(name, other, p->one, p->two, diffstat, o, p); +} + +static void run_checkdiff(struct diff_filepair *p, struct diff_options *o) +{ + const char *name; + const char *other; + const char *attr_path; + + if (DIFF_PAIR_UNMERGED(p)) { + /* unmerged */ + return; + } + + name = p->one->path; + other = (strcmp(name, p->two->path) ? p->two->path : NULL); + attr_path = other ? other : name; + + if (o->prefix_length) + strip_prefix(o->prefix_length, &name, &other); + + diff_fill_oid_info(p->one); + diff_fill_oid_info(p->two); + + builtin_checkdiff(name, other, attr_path, p->one, p->two, o); +} + +void diff_setup(struct diff_options *options) +{ + memcpy(options, &default_diff_options, sizeof(*options)); + + options->file = stdout; + + options->abbrev = DEFAULT_ABBREV; + options->line_termination = '\n'; + options->break_opt = -1; + options->rename_limit = -1; + options->dirstat_permille = diff_dirstat_permille_default; + options->context = diff_context_default; + options->interhunkcontext = diff_interhunk_context_default; + options->ws_error_highlight = ws_error_highlight_default; + options->flags.rename_empty = 1; + options->objfind = NULL; + + /* pathchange left =NULL by default */ + options->change = diff_change; + options->add_remove = diff_addremove; + options->use_color = diff_use_color_default; + options->detect_rename = diff_detect_rename_default; + options->xdl_opts |= diff_algorithm; + if (diff_indent_heuristic) + DIFF_XDL_SET(options, INDENT_HEURISTIC); + + options->orderfile = diff_order_file_cfg; + + if (diff_no_prefix) { + options->a_prefix = options->b_prefix = ""; + } else if (!diff_mnemonic_prefix) { + options->a_prefix = "a/"; + options->b_prefix = "b/"; + } + + options->color_moved = diff_color_moved_default; +} + +void diff_setup_done(struct diff_options *options) +{ + unsigned check_mask = DIFF_FORMAT_NAME | + DIFF_FORMAT_NAME_STATUS | + DIFF_FORMAT_CHECKDIFF | + DIFF_FORMAT_NO_OUTPUT; + + if (options->set_default) + options->set_default(options); + + if (HAS_MULTI_BITS(options->output_format & check_mask)) + die(_("--name-only, --name-status, --check and -s are mutually exclusive")); + + if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)) + die(_("-G, -S and --find-object are mutually exclusive")); + + /* + * Most of the time we can say "there are changes" + * only by checking if there are changed paths, but + * --ignore-whitespace* options force us to look + * inside contents. + */ + + if ((options->xdl_opts & XDF_WHITESPACE_FLAGS)) + options->flags.diff_from_contents = 1; + else + options->flags.diff_from_contents = 0; + + if (options->flags.find_copies_harder) + options->detect_rename = DIFF_DETECT_COPY; + + if (!options->flags.relative_name) + options->prefix = NULL; + if (options->prefix) + options->prefix_length = strlen(options->prefix); + else + options->prefix_length = 0; + + if (options->output_format & (DIFF_FORMAT_NAME | + DIFF_FORMAT_NAME_STATUS | + DIFF_FORMAT_CHECKDIFF | + DIFF_FORMAT_NO_OUTPUT)) + options->output_format &= ~(DIFF_FORMAT_RAW | + DIFF_FORMAT_NUMSTAT | + DIFF_FORMAT_DIFFSTAT | + DIFF_FORMAT_SHORTSTAT | + DIFF_FORMAT_DIRSTAT | + DIFF_FORMAT_SUMMARY | + DIFF_FORMAT_PATCH); + + /* + * These cases always need recursive; we do not drop caller-supplied + * recursive bits for other formats here. + */ + if (options->output_format & (DIFF_FORMAT_PATCH | + DIFF_FORMAT_NUMSTAT | + DIFF_FORMAT_DIFFSTAT | + DIFF_FORMAT_SHORTSTAT | + DIFF_FORMAT_DIRSTAT | + DIFF_FORMAT_SUMMARY | + DIFF_FORMAT_CHECKDIFF)) + options->flags.recursive = 1; + /* + * Also pickaxe would not work very well if you do not say recursive + */ + if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK) + options->flags.recursive = 1; + /* + * When patches are generated, submodules diffed against the work tree + * must be checked for dirtiness too so it can be shown in the output + */ + if (options->output_format & DIFF_FORMAT_PATCH) + options->flags.dirty_submodules = 1; + + if (options->detect_rename && options->rename_limit < 0) + options->rename_limit = diff_rename_limit_default; + if (options->setup & DIFF_SETUP_USE_CACHE) { + if (!active_cache) + /* read-cache does not die even when it fails + * so it is safe for us to do this here. Also + * it does not smudge active_cache or active_nr + * when it fails, so we do not have to worry about + * cleaning it up ourselves either. + */ + read_cache(); + } + if (40 < options->abbrev) + options->abbrev = 40; /* full */ + + /* + * It does not make sense to show the first hit we happened + * to have found. It does not make sense not to return with + * exit code in such a case either. + */ + if (options->flags.quick) { + options->output_format = DIFF_FORMAT_NO_OUTPUT; + options->flags.exit_with_status = 1; + } + + options->diff_path_counter = 0; + + if (options->flags.follow_renames && options->pathspec.nr != 1) + die(_("--follow requires exactly one pathspec")); + + if (!options->use_color || external_diff()) + options->color_moved = 0; +} + +static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val) +{ + char c, *eq; + int len; + + if (*arg != '-') + return 0; + c = *++arg; + if (!c) + return 0; + if (c == arg_short) { + c = *++arg; + if (!c) + return 1; + if (val && isdigit(c)) { + char *end; + int n = strtoul(arg, &end, 10); + if (*end) + return 0; + *val = n; + return 1; + } + return 0; + } + if (c != '-') + return 0; + arg++; + eq = strchrnul(arg, '='); + len = eq - arg; + if (!len || strncmp(arg, arg_long, len)) + return 0; + if (*eq) { + int n; + char *end; + if (!isdigit(*++eq)) + return 0; + n = strtoul(eq, &end, 10); + if (*end) + return 0; + *val = n; + } + return 1; +} + +static int diff_scoreopt_parse(const char *opt); + +static inline int short_opt(char opt, const char **argv, + const char **optarg) +{ + const char *arg = argv[0]; + if (arg[0] != '-' || arg[1] != opt) + return 0; + if (arg[2] != '\0') { + *optarg = arg + 2; + return 1; + } + if (!argv[1]) + die("Option '%c' requires a value", opt); + *optarg = argv[1]; + return 2; +} + +int parse_long_opt(const char *opt, const char **argv, + const char **optarg) +{ + const char *arg = argv[0]; + if (!skip_prefix(arg, "--", &arg)) + return 0; + if (!skip_prefix(arg, opt, &arg)) + return 0; + if (*arg == '=') { /* stuck form: --option=value */ + *optarg = arg + 1; + return 1; + } + if (*arg != '\0') + return 0; + /* separate form: --option value */ + if (!argv[1]) + die("Option '--%s' requires a value", opt); + *optarg = argv[1]; + return 2; +} + +static int stat_opt(struct diff_options *options, const char **av) +{ + const char *arg = av[0]; + char *end; + int width = options->stat_width; + int name_width = options->stat_name_width; + int graph_width = options->stat_graph_width; + int count = options->stat_count; + int argcount = 1; + + if (!skip_prefix(arg, "--stat", &arg)) + die("BUG: stat option does not begin with --stat: %s", arg); + end = (char *)arg; + + switch (*arg) { + case '-': + if (skip_prefix(arg, "-width", &arg)) { + if (*arg == '=') + width = strtoul(arg + 1, &end, 10); + else if (!*arg && !av[1]) + die_want_option("--stat-width"); + else if (!*arg) { + width = strtoul(av[1], &end, 10); + argcount = 2; + } + } else if (skip_prefix(arg, "-name-width", &arg)) { + if (*arg == '=') + name_width = strtoul(arg + 1, &end, 10); + else if (!*arg && !av[1]) + die_want_option("--stat-name-width"); + else if (!*arg) { + name_width = strtoul(av[1], &end, 10); + argcount = 2; + } + } else if (skip_prefix(arg, "-graph-width", &arg)) { + if (*arg == '=') + graph_width = strtoul(arg + 1, &end, 10); + else if (!*arg && !av[1]) + die_want_option("--stat-graph-width"); + else if (!*arg) { + graph_width = strtoul(av[1], &end, 10); + argcount = 2; + } + } else if (skip_prefix(arg, "-count", &arg)) { + if (*arg == '=') + count = strtoul(arg + 1, &end, 10); + else if (!*arg && !av[1]) + die_want_option("--stat-count"); + else if (!*arg) { + count = strtoul(av[1], &end, 10); + argcount = 2; + } + } + break; + case '=': + width = strtoul(arg+1, &end, 10); + if (*end == ',') + name_width = strtoul(end+1, &end, 10); + if (*end == ',') + count = strtoul(end+1, &end, 10); + } + + /* Important! This checks all the error cases! */ + if (*end) + return 0; + options->output_format |= DIFF_FORMAT_DIFFSTAT; + options->stat_name_width = name_width; + options->stat_graph_width = graph_width; + options->stat_width = width; + options->stat_count = count; + return argcount; +} + +static int parse_dirstat_opt(struct diff_options *options, const char *params) +{ + struct strbuf errmsg = STRBUF_INIT; + if (parse_dirstat_params(options, params, &errmsg)) + die(_("Failed to parse --dirstat/-X option parameter:\n%s"), + errmsg.buf); + strbuf_release(&errmsg); + /* + * The caller knows a dirstat-related option is given from the command + * line; allow it to say "return this_function();" + */ + options->output_format |= DIFF_FORMAT_DIRSTAT; + return 1; +} + +static int parse_submodule_opt(struct diff_options *options, const char *value) +{ + if (parse_submodule_params(options, value)) + die(_("Failed to parse --submodule option parameter: '%s'"), + value); + return 1; +} + +static const char diff_status_letters[] = { + DIFF_STATUS_ADDED, + DIFF_STATUS_COPIED, + DIFF_STATUS_DELETED, + DIFF_STATUS_MODIFIED, + DIFF_STATUS_RENAMED, + DIFF_STATUS_TYPE_CHANGED, + DIFF_STATUS_UNKNOWN, + DIFF_STATUS_UNMERGED, + DIFF_STATUS_FILTER_AON, + DIFF_STATUS_FILTER_BROKEN, + '\0', +}; + +static unsigned int filter_bit['Z' + 1]; + +static void prepare_filter_bits(void) +{ + int i; + + if (!filter_bit[DIFF_STATUS_ADDED]) { + for (i = 0; diff_status_letters[i]; i++) + filter_bit[(int) diff_status_letters[i]] = (1 << i); + } +} + +static unsigned filter_bit_tst(char status, const struct diff_options *opt) +{ + return opt->filter & filter_bit[(int) status]; +} + +static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt) +{ + int i, optch; + + prepare_filter_bits(); + + /* + * If there is a negation e.g. 'd' in the input, and we haven't + * initialized the filter field with another --diff-filter, start + * from full set of bits, except for AON. + */ + if (!opt->filter) { + for (i = 0; (optch = optarg[i]) != '\0'; i++) { + if (optch < 'a' || 'z' < optch) + continue; + opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1; + opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON]; + break; + } + } + + for (i = 0; (optch = optarg[i]) != '\0'; i++) { + unsigned int bit; + int negate; + + if ('a' <= optch && optch <= 'z') { + negate = 1; + optch = toupper(optch); + } else { + negate = 0; + } + + bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0; + if (!bit) + return optarg[i]; + if (negate) + opt->filter &= ~bit; + else + opt->filter |= bit; + } + return 0; +} + +static void enable_patch_output(int *fmt) { + *fmt &= ~DIFF_FORMAT_NO_OUTPUT; + *fmt |= DIFF_FORMAT_PATCH; +} + +static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg) +{ + int val = parse_ws_error_highlight(arg); + + if (val < 0) { + error("unknown value after ws-error-highlight=%.*s", + -1 - val, arg); + return 0; + } + opt->ws_error_highlight = val; + return 1; +} + +static int parse_objfind_opt(struct diff_options *opt, const char *arg) +{ + struct object_id oid; + + if (get_oid(arg, &oid)) + return error("unable to resolve '%s'", arg); + + if (!opt->objfind) + opt->objfind = xcalloc(1, sizeof(*opt->objfind)); + + opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND; + opt->flags.recursive = 1; + opt->flags.tree_in_recursive = 1; + oidset_insert(opt->objfind, &oid); + return 1; +} + +int diff_opt_parse(struct diff_options *options, + const char **av, int ac, const char *prefix) +{ + const char *arg = av[0]; + const char *optarg; + int argcount; + + if (!prefix) + prefix = ""; + + /* Output format options */ + if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch") + || opt_arg(arg, 'U', "unified", &options->context)) + enable_patch_output(&options->output_format); + else if (!strcmp(arg, "--raw")) + options->output_format |= DIFF_FORMAT_RAW; + else if (!strcmp(arg, "--patch-with-raw")) { + enable_patch_output(&options->output_format); + options->output_format |= DIFF_FORMAT_RAW; + } else if (!strcmp(arg, "--numstat")) + options->output_format |= DIFF_FORMAT_NUMSTAT; + else if (!strcmp(arg, "--shortstat")) + options->output_format |= DIFF_FORMAT_SHORTSTAT; + else if (skip_prefix(arg, "-X", &arg) || + skip_to_optional_arg(arg, "--dirstat", &arg)) + return parse_dirstat_opt(options, arg); + else if (!strcmp(arg, "--cumulative")) + return parse_dirstat_opt(options, "cumulative"); + else if (skip_to_optional_arg(arg, "--dirstat-by-file", &arg)) { + parse_dirstat_opt(options, "files"); + return parse_dirstat_opt(options, arg); + } + else if (!strcmp(arg, "--check")) + options->output_format |= DIFF_FORMAT_CHECKDIFF; + else if (!strcmp(arg, "--summary")) + options->output_format |= DIFF_FORMAT_SUMMARY; + else if (!strcmp(arg, "--patch-with-stat")) { + enable_patch_output(&options->output_format); + options->output_format |= DIFF_FORMAT_DIFFSTAT; + } else if (!strcmp(arg, "--name-only")) + options->output_format |= DIFF_FORMAT_NAME; + else if (!strcmp(arg, "--name-status")) + options->output_format |= DIFF_FORMAT_NAME_STATUS; + else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch")) + options->output_format |= DIFF_FORMAT_NO_OUTPUT; + else if (starts_with(arg, "--stat")) + /* --stat, --stat-width, --stat-name-width, or --stat-count */ + return stat_opt(options, av); + + /* renames options */ + else if (starts_with(arg, "-B") || + skip_to_optional_arg(arg, "--break-rewrites", NULL)) { + if ((options->break_opt = diff_scoreopt_parse(arg)) == -1) + return error("invalid argument to -B: %s", arg+2); + } + else if (starts_with(arg, "-M") || + skip_to_optional_arg(arg, "--find-renames", NULL)) { + if ((options->rename_score = diff_scoreopt_parse(arg)) == -1) + return error("invalid argument to -M: %s", arg+2); + options->detect_rename = DIFF_DETECT_RENAME; + } + else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) { + options->irreversible_delete = 1; + } + else if (starts_with(arg, "-C") || + skip_to_optional_arg(arg, "--find-copies", NULL)) { + if (options->detect_rename == DIFF_DETECT_COPY) + options->flags.find_copies_harder = 1; + if ((options->rename_score = diff_scoreopt_parse(arg)) == -1) + return error("invalid argument to -C: %s", arg+2); + options->detect_rename = DIFF_DETECT_COPY; + } + else if (!strcmp(arg, "--no-renames")) + options->detect_rename = 0; + else if (!strcmp(arg, "--rename-empty")) + options->flags.rename_empty = 1; + else if (!strcmp(arg, "--no-rename-empty")) + options->flags.rename_empty = 0; + else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) { + options->flags.relative_name = 1; + if (arg) + options->prefix = arg; + } + + /* xdiff options */ + else if (!strcmp(arg, "--minimal")) + DIFF_XDL_SET(options, NEED_MINIMAL); + else if (!strcmp(arg, "--no-minimal")) + DIFF_XDL_CLR(options, NEED_MINIMAL); + else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space")) + DIFF_XDL_SET(options, IGNORE_WHITESPACE); + else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change")) + DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE); + else if (!strcmp(arg, "--ignore-space-at-eol")) + DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL); + else if (!strcmp(arg, "--ignore-cr-at-eol")) + DIFF_XDL_SET(options, IGNORE_CR_AT_EOL); + else if (!strcmp(arg, "--ignore-blank-lines")) + DIFF_XDL_SET(options, IGNORE_BLANK_LINES); + else if (!strcmp(arg, "--indent-heuristic")) + DIFF_XDL_SET(options, INDENT_HEURISTIC); + else if (!strcmp(arg, "--no-indent-heuristic")) + DIFF_XDL_CLR(options, INDENT_HEURISTIC); + else if (!strcmp(arg, "--patience")) { + int i; + options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF); + /* + * Both --patience and --anchored use PATIENCE_DIFF + * internally, so remove any anchors previously + * specified. + */ + for (i = 0; i < options->anchors_nr; i++) + free(options->anchors[i]); + options->anchors_nr = 0; + } else if (!strcmp(arg, "--histogram")) + options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF); + else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) { + long value = parse_algorithm_value(optarg); + if (value < 0) + return error("option diff-algorithm accepts \"myers\", " + "\"minimal\", \"patience\" and \"histogram\""); + /* clear out previous settings */ + DIFF_XDL_CLR(options, NEED_MINIMAL); + options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK; + options->xdl_opts |= value; + return argcount; + } else if (skip_prefix(arg, "--anchored=", &arg)) { + options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF); + ALLOC_GROW(options->anchors, options->anchors_nr + 1, + options->anchors_alloc); + options->anchors[options->anchors_nr++] = xstrdup(arg); + } + + /* flags options */ + else if (!strcmp(arg, "--binary")) { + enable_patch_output(&options->output_format); + options->flags.binary = 1; + } + else if (!strcmp(arg, "--full-index")) + options->flags.full_index = 1; + else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) + options->flags.text = 1; + else if (!strcmp(arg, "-R")) + options->flags.reverse_diff = 1; + else if (!strcmp(arg, "--find-copies-harder")) + options->flags.find_copies_harder = 1; + else if (!strcmp(arg, "--follow")) + options->flags.follow_renames = 1; + else if (!strcmp(arg, "--no-follow")) { + options->flags.follow_renames = 0; + options->flags.default_follow_renames = 0; + } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) { + int value = git_config_colorbool(NULL, arg); + if (value < 0) + return error("option `color' expects \"always\", \"auto\", or \"never\""); + options->use_color = value; + } + else if (!strcmp(arg, "--no-color")) + options->use_color = 0; + else if (!strcmp(arg, "--color-moved")) { + if (diff_color_moved_default) + options->color_moved = diff_color_moved_default; + if (options->color_moved == COLOR_MOVED_NO) + options->color_moved = COLOR_MOVED_DEFAULT; + } else if (!strcmp(arg, "--no-color-moved")) + options->color_moved = COLOR_MOVED_NO; + else if (skip_prefix(arg, "--color-moved=", &arg)) { + int cm = parse_color_moved(arg); + if (cm < 0) + die("bad --color-moved argument: %s", arg); + options->color_moved = cm; + } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) { + options->use_color = 1; + options->word_diff = DIFF_WORDS_COLOR; + } + else if (!strcmp(arg, "--word-diff")) { + if (options->word_diff == DIFF_WORDS_NONE) + options->word_diff = DIFF_WORDS_PLAIN; + } + else if (skip_prefix(arg, "--word-diff=", &arg)) { + if (!strcmp(arg, "plain")) + options->word_diff = DIFF_WORDS_PLAIN; + else if (!strcmp(arg, "color")) { + options->use_color = 1; + options->word_diff = DIFF_WORDS_COLOR; + } + else if (!strcmp(arg, "porcelain")) + options->word_diff = DIFF_WORDS_PORCELAIN; + else if (!strcmp(arg, "none")) + options->word_diff = DIFF_WORDS_NONE; + else + die("bad --word-diff argument: %s", arg); + } + else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) { + if (options->word_diff == DIFF_WORDS_NONE) + options->word_diff = DIFF_WORDS_PLAIN; + options->word_regex = optarg; + return argcount; + } + else if (!strcmp(arg, "--exit-code")) + options->flags.exit_with_status = 1; + else if (!strcmp(arg, "--quiet")) + options->flags.quick = 1; + else if (!strcmp(arg, "--ext-diff")) + options->flags.allow_external = 1; + else if (!strcmp(arg, "--no-ext-diff")) + options->flags.allow_external = 0; + else if (!strcmp(arg, "--textconv")) { + options->flags.allow_textconv = 1; + options->flags.textconv_set_via_cmdline = 1; + } else if (!strcmp(arg, "--no-textconv")) + options->flags.allow_textconv = 0; + else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) { + options->flags.override_submodule_config = 1; + handle_ignore_submodules_arg(options, arg); + } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log")) + return parse_submodule_opt(options, arg); + else if (skip_prefix(arg, "--ws-error-highlight=", &arg)) + return parse_ws_error_highlight_opt(options, arg); + else if (!strcmp(arg, "--ita-invisible-in-index")) + options->ita_invisible_in_index = 1; + else if (!strcmp(arg, "--ita-visible-in-index")) + options->ita_invisible_in_index = 0; + + /* misc options */ + else if (!strcmp(arg, "-z")) + options->line_termination = 0; + else if ((argcount = short_opt('l', av, &optarg))) { + options->rename_limit = strtoul(optarg, NULL, 10); + return argcount; + } + else if ((argcount = short_opt('S', av, &optarg))) { + options->pickaxe = optarg; + options->pickaxe_opts |= DIFF_PICKAXE_KIND_S; + return argcount; + } else if ((argcount = short_opt('G', av, &optarg))) { + options->pickaxe = optarg; + options->pickaxe_opts |= DIFF_PICKAXE_KIND_G; + return argcount; + } + else if (!strcmp(arg, "--pickaxe-all")) + options->pickaxe_opts |= DIFF_PICKAXE_ALL; + else if (!strcmp(arg, "--pickaxe-regex")) + options->pickaxe_opts |= DIFF_PICKAXE_REGEX; + else if ((argcount = short_opt('O', av, &optarg))) { + options->orderfile = prefix_filename(prefix, optarg); + return argcount; + } else if (skip_prefix(arg, "--find-object=", &arg)) + return parse_objfind_opt(options, arg); + else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) { + int offending = parse_diff_filter_opt(optarg, options); + if (offending) + die("unknown change class '%c' in --diff-filter=%s", + offending, optarg); + return argcount; + } + else if (!strcmp(arg, "--no-abbrev")) + options->abbrev = 0; + else if (!strcmp(arg, "--abbrev")) + options->abbrev = DEFAULT_ABBREV; + else if (skip_prefix(arg, "--abbrev=", &arg)) { + options->abbrev = strtoul(arg, NULL, 10); + if (options->abbrev < MINIMUM_ABBREV) + options->abbrev = MINIMUM_ABBREV; + else if (40 < options->abbrev) + options->abbrev = 40; + } + else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) { + options->a_prefix = optarg; + return argcount; + } + else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) { + options->line_prefix = optarg; + options->line_prefix_length = strlen(options->line_prefix); + graph_setup_line_prefix(options); + return argcount; + } + else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) { + options->b_prefix = optarg; + return argcount; + } + else if (!strcmp(arg, "--no-prefix")) + options->a_prefix = options->b_prefix = ""; + else if (opt_arg(arg, '\0', "inter-hunk-context", + &options->interhunkcontext)) + ; + else if (!strcmp(arg, "-W")) + options->flags.funccontext = 1; + else if (!strcmp(arg, "--function-context")) + options->flags.funccontext = 1; + else if (!strcmp(arg, "--no-function-context")) + options->flags.funccontext = 0; + else if ((argcount = parse_long_opt("output", av, &optarg))) { + char *path = prefix_filename(prefix, optarg); + options->file = xfopen(path, "w"); + options->close_file = 1; + if (options->use_color != GIT_COLOR_ALWAYS) + options->use_color = GIT_COLOR_NEVER; + free(path); + return argcount; + } else + return 0; + return 1; +} + +int parse_rename_score(const char **cp_p) +{ + unsigned long num, scale; + int ch, dot; + const char *cp = *cp_p; + + num = 0; + scale = 1; + dot = 0; + for (;;) { + ch = *cp; + if ( !dot && ch == '.' ) { + scale = 1; + dot = 1; + } else if ( ch == '%' ) { + scale = dot ? scale*100 : 100; + cp++; /* % is always at the end */ + break; + } else if ( ch >= '0' && ch <= '9' ) { + if ( scale < 100000 ) { + scale *= 10; + num = (num*10) + (ch-'0'); + } + } else { + break; + } + cp++; + } + *cp_p = cp; + + /* user says num divided by scale and we say internally that + * is MAX_SCORE * num / scale. + */ + return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale)); +} + +static int diff_scoreopt_parse(const char *opt) +{ + int opt1, opt2, cmd; + + if (*opt++ != '-') + return -1; + cmd = *opt++; + if (cmd == '-') { + /* convert the long-form arguments into short-form versions */ + if (skip_prefix(opt, "break-rewrites", &opt)) { + if (*opt == 0 || *opt++ == '=') + cmd = 'B'; + } else if (skip_prefix(opt, "find-copies", &opt)) { + if (*opt == 0 || *opt++ == '=') + cmd = 'C'; + } else if (skip_prefix(opt, "find-renames", &opt)) { + if (*opt == 0 || *opt++ == '=') + cmd = 'M'; + } + } + if (cmd != 'M' && cmd != 'C' && cmd != 'B') + return -1; /* that is not a -M, -C, or -B option */ + + opt1 = parse_rename_score(&opt); + if (cmd != 'B') + opt2 = 0; + else { + if (*opt == 0) + opt2 = 0; + else if (*opt != '/') + return -1; /* we expect -B80/99 or -B80 */ + else { + opt++; + opt2 = parse_rename_score(&opt); + } + } + if (*opt != 0) + return -1; + return opt1 | (opt2 << 16); +} + +struct diff_queue_struct diff_queued_diff; + +void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp) +{ + ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc); + queue->queue[queue->nr++] = dp; +} + +struct diff_filepair *diff_queue(struct diff_queue_struct *queue, + struct diff_filespec *one, + struct diff_filespec *two) +{ + struct diff_filepair *dp = xcalloc(1, sizeof(*dp)); + dp->one = one; + dp->two = two; + if (queue) + diff_q(queue, dp); + return dp; +} + +void diff_free_filepair(struct diff_filepair *p) +{ + free_filespec(p->one); + free_filespec(p->two); + free(p); +} + +const char *diff_aligned_abbrev(const struct object_id *oid, int len) +{ + int abblen; + const char *abbrev; + + /* Do we want all 40 hex characters? */ + if (len == GIT_SHA1_HEXSZ) + return oid_to_hex(oid); + + /* An abbreviated value is fine, possibly followed by an ellipsis. */ + abbrev = diff_abbrev_oid(oid, len); + + if (!print_sha1_ellipsis()) + return abbrev; + + abblen = strlen(abbrev); + + /* + * In well-behaved cases, where the abbreviated result is the + * same as the requested length, append three dots after the + * abbreviation (hence the whole logic is limited to the case + * where abblen < 37); when the actual abbreviated result is a + * bit longer than the requested length, we reduce the number + * of dots so that they match the well-behaved ones. However, + * if the actual abbreviation is longer than the requested + * length by more than three, we give up on aligning, and add + * three dots anyway, to indicate that the output is not the + * full object name. Yes, this may be suboptimal, but this + * appears only in "diff --raw --abbrev" output and it is not + * worth the effort to change it now. Note that this would + * likely to work fine when the automatic sizing of default + * abbreviation length is used--we would be fed -1 in "len" in + * that case, and will end up always appending three-dots, but + * the automatic sizing is supposed to give abblen that ensures + * uniqueness across all objects (statistically speaking). + */ + if (abblen < GIT_SHA1_HEXSZ - 3) { + static char hex[GIT_MAX_HEXSZ + 1]; + if (len < abblen && abblen <= len + 2) + xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, ".."); + else + xsnprintf(hex, sizeof(hex), "%s...", abbrev); + return hex; + } + + return oid_to_hex(oid); +} + +static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt) +{ + int line_termination = opt->line_termination; + int inter_name_termination = line_termination ? '\t' : '\0'; + + fprintf(opt->file, "%s", diff_line_prefix(opt)); + if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) { + fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode, + diff_aligned_abbrev(&p->one->oid, opt->abbrev)); + fprintf(opt->file, "%s ", + diff_aligned_abbrev(&p->two->oid, opt->abbrev)); + } + if (p->score) { + fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p), + inter_name_termination); + } else { + fprintf(opt->file, "%c%c", p->status, inter_name_termination); + } + + if (p->status == DIFF_STATUS_COPIED || + p->status == DIFF_STATUS_RENAMED) { + const char *name_a, *name_b; + name_a = p->one->path; + name_b = p->two->path; + strip_prefix(opt->prefix_length, &name_a, &name_b); + write_name_quoted(name_a, opt->file, inter_name_termination); + write_name_quoted(name_b, opt->file, line_termination); + } else { + const char *name_a, *name_b; + name_a = p->one->mode ? p->one->path : p->two->path; + name_b = NULL; + strip_prefix(opt->prefix_length, &name_a, &name_b); + write_name_quoted(name_a, opt->file, line_termination); + } +} + +int diff_unmodified_pair(struct diff_filepair *p) +{ + /* This function is written stricter than necessary to support + * the currently implemented transformers, but the idea is to + * let transformers to produce diff_filepairs any way they want, + * and filter and clean them up here before producing the output. + */ + struct diff_filespec *one = p->one, *two = p->two; + + if (DIFF_PAIR_UNMERGED(p)) + return 0; /* unmerged is interesting */ + + /* deletion, addition, mode or type change + * and rename are all interesting. + */ + if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) || + DIFF_PAIR_MODE_CHANGED(p) || + strcmp(one->path, two->path)) + return 0; + + /* both are valid and point at the same path. that is, we are + * dealing with a change. + */ + if (one->oid_valid && two->oid_valid && + !oidcmp(&one->oid, &two->oid) && + !one->dirty_submodule && !two->dirty_submodule) + return 1; /* no change */ + if (!one->oid_valid && !two->oid_valid) + return 1; /* both look at the same file on the filesystem. */ + return 0; +} + +static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o) +{ + if (diff_unmodified_pair(p)) + return; + + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; /* no tree diffs in patch format */ + + run_diff(p, o); +} + +static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o, + struct diffstat_t *diffstat) +{ + if (diff_unmodified_pair(p)) + return; + + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; /* no useful stat for tree diffs */ + + run_diffstat(p, o, diffstat); +} + +static void diff_flush_checkdiff(struct diff_filepair *p, + struct diff_options *o) +{ + if (diff_unmodified_pair(p)) + return; + + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; /* nothing to check in tree diffs */ + + run_checkdiff(p, o); +} + +int diff_queue_is_empty(void) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i; + for (i = 0; i < q->nr; i++) + if (!diff_unmodified_pair(q->queue[i])) + return 0; + return 1; +} + +#if DIFF_DEBUG +void diff_debug_filespec(struct diff_filespec *s, int x, const char *one) +{ + fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n", + x, one ? one : "", + s->path, + DIFF_FILE_VALID(s) ? "valid" : "invalid", + s->mode, + s->oid_valid ? oid_to_hex(&s->oid) : ""); + fprintf(stderr, "queue[%d] %s size %lu\n", + x, one ? one : "", + s->size); +} + +void diff_debug_filepair(const struct diff_filepair *p, int i) +{ + diff_debug_filespec(p->one, i, "one"); + diff_debug_filespec(p->two, i, "two"); + fprintf(stderr, "score %d, status %c rename_used %d broken %d\n", + p->score, p->status ? p->status : '?', + p->one->rename_used, p->broken_pair); +} + +void diff_debug_queue(const char *msg, struct diff_queue_struct *q) +{ + int i; + if (msg) + fprintf(stderr, "%s\n", msg); + fprintf(stderr, "q->nr = %d\n", q->nr); + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + diff_debug_filepair(p, i); + } +} +#endif + +static void diff_resolve_rename_copy(void) +{ + int i; + struct diff_filepair *p; + struct diff_queue_struct *q = &diff_queued_diff; + + diff_debug_queue("resolve-rename-copy", q); + + for (i = 0; i < q->nr; i++) { + p = q->queue[i]; + p->status = 0; /* undecided */ + if (DIFF_PAIR_UNMERGED(p)) + p->status = DIFF_STATUS_UNMERGED; + else if (!DIFF_FILE_VALID(p->one)) + p->status = DIFF_STATUS_ADDED; + else if (!DIFF_FILE_VALID(p->two)) + p->status = DIFF_STATUS_DELETED; + else if (DIFF_PAIR_TYPE_CHANGED(p)) + p->status = DIFF_STATUS_TYPE_CHANGED; + + /* from this point on, we are dealing with a pair + * whose both sides are valid and of the same type, i.e. + * either in-place edit or rename/copy edit. + */ + else if (DIFF_PAIR_RENAME(p)) { + /* + * A rename might have re-connected a broken + * pair up, causing the pathnames to be the + * same again. If so, that's not a rename at + * all, just a modification.. + * + * Otherwise, see if this source was used for + * multiple renames, in which case we decrement + * the count, and call it a copy. + */ + if (!strcmp(p->one->path, p->two->path)) + p->status = DIFF_STATUS_MODIFIED; + else if (--p->one->rename_used > 0) + p->status = DIFF_STATUS_COPIED; + else + p->status = DIFF_STATUS_RENAMED; + } + else if (oidcmp(&p->one->oid, &p->two->oid) || + p->one->mode != p->two->mode || + p->one->dirty_submodule || + p->two->dirty_submodule || + is_null_oid(&p->one->oid)) + p->status = DIFF_STATUS_MODIFIED; + else { + /* This is a "no-change" entry and should not + * happen anymore, but prepare for broken callers. + */ + error("feeding unmodified %s to diffcore", + p->one->path); + p->status = DIFF_STATUS_UNKNOWN; + } + } + diff_debug_queue("resolve-rename-copy done", q); +} + +static int check_pair_status(struct diff_filepair *p) +{ + switch (p->status) { + case DIFF_STATUS_UNKNOWN: + return 0; + case 0: + die("internal error in diff-resolve-rename-copy"); + default: + return 1; + } +} + +static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt) +{ + int fmt = opt->output_format; + + if (fmt & DIFF_FORMAT_CHECKDIFF) + diff_flush_checkdiff(p, opt); + else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS)) + diff_flush_raw(p, opt); + else if (fmt & DIFF_FORMAT_NAME) { + const char *name_a, *name_b; + name_a = p->two->path; + name_b = NULL; + strip_prefix(opt->prefix_length, &name_a, &name_b); + fprintf(opt->file, "%s", diff_line_prefix(opt)); + write_name_quoted(name_a, opt->file, opt->line_termination); + } +} + +static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs) +{ + struct strbuf sb = STRBUF_INIT; + if (fs->mode) + strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode); + else + strbuf_addf(&sb, " %s ", newdelete); + + quote_c_style(fs->path, &sb, NULL, 0); + strbuf_addch(&sb, '\n'); + emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY, + sb.buf, sb.len, 0); + strbuf_release(&sb); +} + +static void show_mode_change(struct diff_options *opt, struct diff_filepair *p, + int show_name) +{ + if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) { + struct strbuf sb = STRBUF_INIT; + strbuf_addf(&sb, " mode change %06o => %06o", + p->one->mode, p->two->mode); + if (show_name) { + strbuf_addch(&sb, ' '); + quote_c_style(p->two->path, &sb, NULL, 0); + } + strbuf_addch(&sb, '\n'); + emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY, + sb.buf, sb.len, 0); + strbuf_release(&sb); + } +} + +static void show_rename_copy(struct diff_options *opt, const char *renamecopy, + struct diff_filepair *p) +{ + struct strbuf sb = STRBUF_INIT; + char *names = pprint_rename(p->one->path, p->two->path); + strbuf_addf(&sb, " %s %s (%d%%)\n", + renamecopy, names, similarity_index(p)); + free(names); + emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY, + sb.buf, sb.len, 0); + show_mode_change(opt, p, 0); + strbuf_release(&sb); +} + +static void diff_summary(struct diff_options *opt, struct diff_filepair *p) +{ + switch(p->status) { + case DIFF_STATUS_DELETED: + show_file_mode_name(opt, "delete", p->one); + break; + case DIFF_STATUS_ADDED: + show_file_mode_name(opt, "create", p->two); + break; + case DIFF_STATUS_COPIED: + show_rename_copy(opt, "copy", p); + break; + case DIFF_STATUS_RENAMED: + show_rename_copy(opt, "rename", p); + break; + default: + if (p->score) { + struct strbuf sb = STRBUF_INIT; + strbuf_addstr(&sb, " rewrite "); + quote_c_style(p->two->path, &sb, NULL, 0); + strbuf_addf(&sb, " (%d%%)\n", similarity_index(p)); + emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY, + sb.buf, sb.len, 0); + strbuf_release(&sb); + } + show_mode_change(opt, p, !p->score); + break; + } +} + +struct patch_id_t { + git_SHA_CTX *ctx; + int patchlen; +}; + +static int remove_space(char *line, int len) +{ + int i; + char *dst = line; + unsigned char c; + + for (i = 0; i < len; i++) + if (!isspace((c = line[i]))) + *dst++ = c; + + return dst - line; +} + +static void patch_id_consume(void *priv, char *line, unsigned long len) +{ + struct patch_id_t *data = priv; + int new_len; + + /* Ignore line numbers when computing the SHA1 of the patch */ + if (starts_with(line, "@@ -")) + return; + + new_len = remove_space(line, len); + + git_SHA1_Update(data->ctx, line, new_len); + data->patchlen += new_len; +} + +static void patch_id_add_string(git_SHA_CTX *ctx, const char *str) +{ + git_SHA1_Update(ctx, str, strlen(str)); +} + +static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode) +{ + /* large enough for 2^32 in octal */ + char buf[12]; + int len = xsnprintf(buf, sizeof(buf), "%06o", mode); + git_SHA1_Update(ctx, buf, len); +} + +/* returns 0 upon success, and writes result into sha1 */ +static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i; + git_SHA_CTX ctx; + struct patch_id_t data; + + git_SHA1_Init(&ctx); + memset(&data, 0, sizeof(struct patch_id_t)); + data.ctx = &ctx; + + for (i = 0; i < q->nr; i++) { + xpparam_t xpp; + xdemitconf_t xecfg; + mmfile_t mf1, mf2; + struct diff_filepair *p = q->queue[i]; + int len1, len2; + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + if (p->status == 0) + return error("internal diff status error"); + if (p->status == DIFF_STATUS_UNKNOWN) + continue; + if (diff_unmodified_pair(p)) + continue; + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + continue; + if (DIFF_PAIR_UNMERGED(p)) + continue; + + diff_fill_oid_info(p->one); + diff_fill_oid_info(p->two); + + len1 = remove_space(p->one->path, strlen(p->one->path)); + len2 = remove_space(p->two->path, strlen(p->two->path)); + patch_id_add_string(&ctx, "diff--git"); + patch_id_add_string(&ctx, "a/"); + git_SHA1_Update(&ctx, p->one->path, len1); + patch_id_add_string(&ctx, "b/"); + git_SHA1_Update(&ctx, p->two->path, len2); + + if (p->one->mode == 0) { + patch_id_add_string(&ctx, "newfilemode"); + patch_id_add_mode(&ctx, p->two->mode); + patch_id_add_string(&ctx, "---/dev/null"); + patch_id_add_string(&ctx, "+++b/"); + git_SHA1_Update(&ctx, p->two->path, len2); + } else if (p->two->mode == 0) { + patch_id_add_string(&ctx, "deletedfilemode"); + patch_id_add_mode(&ctx, p->one->mode); + patch_id_add_string(&ctx, "---a/"); + git_SHA1_Update(&ctx, p->one->path, len1); + patch_id_add_string(&ctx, "+++/dev/null"); + } else { + patch_id_add_string(&ctx, "---a/"); + git_SHA1_Update(&ctx, p->one->path, len1); + patch_id_add_string(&ctx, "+++b/"); + git_SHA1_Update(&ctx, p->two->path, len2); + } + + if (diff_header_only) + continue; + + if (fill_mmfile(&mf1, p->one) < 0 || + fill_mmfile(&mf2, p->two) < 0) + return error("unable to read files to diff"); + + if (diff_filespec_is_binary(p->one) || + diff_filespec_is_binary(p->two)) { + git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid), + GIT_SHA1_HEXSZ); + git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid), + GIT_SHA1_HEXSZ); + continue; + } + + xpp.flags = 0; + xecfg.ctxlen = 3; + xecfg.flags = 0; + if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data, + &xpp, &xecfg)) + return error("unable to generate patch-id diff for %s", + p->one->path); + } + + git_SHA1_Final(oid->hash, &ctx); + return 0; +} + +int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i; + int result = diff_get_patch_id(options, oid, diff_header_only); + + for (i = 0; i < q->nr; i++) + diff_free_filepair(q->queue[i]); + + free(q->queue); + DIFF_QUEUE_CLEAR(q); + + return result; +} + +static int is_summary_empty(const struct diff_queue_struct *q) +{ + int i; + + for (i = 0; i < q->nr; i++) { + const struct diff_filepair *p = q->queue[i]; + + switch (p->status) { + case DIFF_STATUS_DELETED: + case DIFF_STATUS_ADDED: + case DIFF_STATUS_COPIED: + case DIFF_STATUS_RENAMED: + return 0; + default: + if (p->score) + return 0; + if (p->one->mode && p->two->mode && + p->one->mode != p->two->mode) + return 0; + break; + } + } + return 1; +} + +static const char rename_limit_warning[] = +N_("inexact rename detection was skipped due to too many files."); + +static const char degrade_cc_to_c_warning[] = +N_("only found copies from modified paths due to too many files."); + +static const char rename_limit_advice[] = +N_("you may want to set your %s variable to at least " + "%d and retry the command."); + +void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc) +{ + fflush(stdout); + if (degraded_cc) + warning(_(degrade_cc_to_c_warning)); + else if (needed) + warning(_(rename_limit_warning)); + else + return; + if (0 < needed) + warning(_(rename_limit_advice), varname, needed); +} + +static void diff_flush_patch_all_file_pairs(struct diff_options *o) +{ + int i; + static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT; + struct diff_queue_struct *q = &diff_queued_diff; + + if (WSEH_NEW & WS_RULE_MASK) + die("BUG: WS rules bit mask overlaps with diff symbol flags"); + + if (o->color_moved) + o->emitted_symbols = &esm; + + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + diff_flush_patch(p, o); + } + + if (o->emitted_symbols) { + if (o->color_moved) { + struct hashmap add_lines, del_lines; + + hashmap_init(&del_lines, + (hashmap_cmp_fn)moved_entry_cmp, o, 0); + hashmap_init(&add_lines, + (hashmap_cmp_fn)moved_entry_cmp, o, 0); + + add_lines_to_move_detection(o, &add_lines, &del_lines); + mark_color_as_moved(o, &add_lines, &del_lines); + if (o->color_moved == COLOR_MOVED_ZEBRA_DIM) + dim_moved_lines(o); + + hashmap_free(&add_lines, 0); + hashmap_free(&del_lines, 0); + } + + for (i = 0; i < esm.nr; i++) + emit_diff_symbol_from_struct(o, &esm.buf[i]); + + for (i = 0; i < esm.nr; i++) + free((void *)esm.buf[i].line); + } + esm.nr = 0; +} + +void diff_flush(struct diff_options *options) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i, output_format = options->output_format; + int separator = 0; + int dirstat_by_line = 0; + + /* + * Order: raw, stat, summary, patch + * or: name/name-status/checkdiff (other bits clear) + */ + if (!q->nr) + goto free_queue; + + if (output_format & (DIFF_FORMAT_RAW | + DIFF_FORMAT_NAME | + DIFF_FORMAT_NAME_STATUS | + DIFF_FORMAT_CHECKDIFF)) { + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + flush_one_pair(p, options); + } + separator++; + } + + if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line) + dirstat_by_line = 1; + + if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) || + dirstat_by_line) { + struct diffstat_t diffstat; + + memset(&diffstat, 0, sizeof(struct diffstat_t)); + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + diff_flush_stat(p, options, &diffstat); + } + if (output_format & DIFF_FORMAT_NUMSTAT) + show_numstat(&diffstat, options); + if (output_format & DIFF_FORMAT_DIFFSTAT) + show_stats(&diffstat, options); + if (output_format & DIFF_FORMAT_SHORTSTAT) + show_shortstats(&diffstat, options); + if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line) + show_dirstat_by_line(&diffstat, options); + free_diffstat_info(&diffstat); + separator++; + } + if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line) + show_dirstat(options); + + if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) { + for (i = 0; i < q->nr; i++) { + diff_summary(options, q->queue[i]); + } + separator++; + } + + if (output_format & DIFF_FORMAT_NO_OUTPUT && + options->flags.exit_with_status && + options->flags.diff_from_contents) { + /* + * run diff_flush_patch for the exit status. setting + * options->file to /dev/null should be safe, because we + * aren't supposed to produce any output anyway. + */ + if (options->close_file) + fclose(options->file); + options->file = xfopen("/dev/null", "w"); + options->close_file = 1; + options->color_moved = 0; + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + diff_flush_patch(p, options); + if (options->found_changes) + break; + } + } + + if (output_format & DIFF_FORMAT_PATCH) { + if (separator) { + emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0); + if (options->stat_sep) + /* attach patch instead of inline */ + emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP, + NULL, 0, 0); + } + + diff_flush_patch_all_file_pairs(options); + } + + if (output_format & DIFF_FORMAT_CALLBACK) + options->format_callback(q, options, options->format_callback_data); + + for (i = 0; i < q->nr; i++) + diff_free_filepair(q->queue[i]); +free_queue: + free(q->queue); + DIFF_QUEUE_CLEAR(q); + if (options->close_file) + fclose(options->file); + + /* + * Report the content-level differences with HAS_CHANGES; + * diff_addremove/diff_change does not set the bit when + * DIFF_FROM_CONTENTS is in effect (e.g. with -w). + */ + if (options->flags.diff_from_contents) { + if (options->found_changes) + options->flags.has_changes = 1; + else + options->flags.has_changes = 0; + } +} + +static int match_filter(const struct diff_options *options, const struct diff_filepair *p) +{ + return (((p->status == DIFF_STATUS_MODIFIED) && + ((p->score && + filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) || + (!p->score && + filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) || + ((p->status != DIFF_STATUS_MODIFIED) && + filter_bit_tst(p->status, options))); +} + +static void diffcore_apply_filter(struct diff_options *options) +{ + int i; + struct diff_queue_struct *q = &diff_queued_diff; + struct diff_queue_struct outq; + + DIFF_QUEUE_CLEAR(&outq); + + if (!options->filter) + return; + + if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) { + int found; + for (i = found = 0; !found && i < q->nr; i++) { + if (match_filter(options, q->queue[i])) + found++; + } + if (found) + return; + + /* otherwise we will clear the whole queue + * by copying the empty outq at the end of this + * function, but first clear the current entries + * in the queue. + */ + for (i = 0; i < q->nr; i++) + diff_free_filepair(q->queue[i]); + } + else { + /* Only the matching ones */ + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (match_filter(options, p)) + diff_q(&outq, p); + else + diff_free_filepair(p); + } + } + free(q->queue); + *q = outq; +} + +/* Check whether two filespecs with the same mode and size are identical */ +static int diff_filespec_is_identical(struct diff_filespec *one, + struct diff_filespec *two) +{ + if (S_ISGITLINK(one->mode)) + return 0; + if (diff_populate_filespec(one, 0)) + return 0; + if (diff_populate_filespec(two, 0)) + return 0; + return !memcmp(one->data, two->data, one->size); +} + +static int diff_filespec_check_stat_unmatch(struct diff_filepair *p) +{ + if (p->done_skip_stat_unmatch) + return p->skip_stat_unmatch_result; + + p->done_skip_stat_unmatch = 1; + p->skip_stat_unmatch_result = 0; + /* + * 1. Entries that come from stat info dirtiness + * always have both sides (iow, not create/delete), + * one side of the object name is unknown, with + * the same mode and size. Keep the ones that + * do not match these criteria. They have real + * differences. + * + * 2. At this point, the file is known to be modified, + * with the same mode and size, and the object + * name of one side is unknown. Need to inspect + * the identical contents. + */ + if (!DIFF_FILE_VALID(p->one) || /* (1) */ + !DIFF_FILE_VALID(p->two) || + (p->one->oid_valid && p->two->oid_valid) || + (p->one->mode != p->two->mode) || + diff_populate_filespec(p->one, CHECK_SIZE_ONLY) || + diff_populate_filespec(p->two, CHECK_SIZE_ONLY) || + (p->one->size != p->two->size) || + !diff_filespec_is_identical(p->one, p->two)) /* (2) */ + p->skip_stat_unmatch_result = 1; + return p->skip_stat_unmatch_result; +} + +static void diffcore_skip_stat_unmatch(struct diff_options *diffopt) +{ + int i; + struct diff_queue_struct *q = &diff_queued_diff; + struct diff_queue_struct outq; + DIFF_QUEUE_CLEAR(&outq); + + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + + if (diff_filespec_check_stat_unmatch(p)) + diff_q(&outq, p); + else { + /* + * The caller can subtract 1 from skip_stat_unmatch + * to determine how many paths were dirty only + * due to stat info mismatch. + */ + if (!diffopt->flags.no_index) + diffopt->skip_stat_unmatch++; + diff_free_filepair(p); + } + } + free(q->queue); + *q = outq; +} + +static int diffnamecmp(const void *a_, const void *b_) +{ + const struct diff_filepair *a = *((const struct diff_filepair **)a_); + const struct diff_filepair *b = *((const struct diff_filepair **)b_); + const char *name_a, *name_b; + + name_a = a->one ? a->one->path : a->two->path; + name_b = b->one ? b->one->path : b->two->path; + return strcmp(name_a, name_b); +} + +void diffcore_fix_diff_index(struct diff_options *options) +{ + struct diff_queue_struct *q = &diff_queued_diff; + QSORT(q->queue, q->nr, diffnamecmp); +} + +void diffcore_std(struct diff_options *options) +{ + /* NOTE please keep the following in sync with diff_tree_combined() */ + if (options->skip_stat_unmatch) + diffcore_skip_stat_unmatch(options); + if (!options->found_follow) { + /* See try_to_follow_renames() in tree-diff.c */ + if (options->break_opt != -1) + diffcore_break(options->break_opt); + if (options->detect_rename) + diffcore_rename(options); + if (options->break_opt != -1) + diffcore_merge_broken(); + } + if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK) + diffcore_pickaxe(options); + if (options->orderfile) + diffcore_order(options->orderfile); + if (!options->found_follow) + /* See try_to_follow_renames() in tree-diff.c */ + diff_resolve_rename_copy(); + diffcore_apply_filter(options); + + if (diff_queued_diff.nr && !options->flags.diff_from_contents) + options->flags.has_changes = 1; + else + options->flags.has_changes = 0; + + options->found_follow = 0; +} + +int diff_result_code(struct diff_options *opt, int status) +{ + int result = 0; + + diff_warn_rename_limit("diff.renameLimit", + opt->needed_rename_limit, + opt->degraded_cc_to_c); + if (!opt->flags.exit_with_status && + !(opt->output_format & DIFF_FORMAT_CHECKDIFF)) + return status; + if (opt->flags.exit_with_status && + opt->flags.has_changes) + result |= 01; + if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) && + opt->flags.check_failed) + result |= 02; + return result; +} + +int diff_can_quit_early(struct diff_options *opt) +{ + return (opt->flags.quick && + !opt->filter && + opt->flags.has_changes); +} + +/* + * Shall changes to this submodule be ignored? + * + * Submodule changes can be configured to be ignored separately for each path, + * but that configuration can be overridden from the command line. + */ +static int is_submodule_ignored(const char *path, struct diff_options *options) +{ + int ignored = 0; + struct diff_flags orig_flags = options->flags; + if (!options->flags.override_submodule_config) + set_diffopt_flags_from_submodule_config(options, path); + if (options->flags.ignore_submodules) + ignored = 1; + options->flags = orig_flags; + return ignored; +} + +void diff_addremove(struct diff_options *options, + int addremove, unsigned mode, + const struct object_id *oid, + int oid_valid, + const char *concatpath, unsigned dirty_submodule) +{ + struct diff_filespec *one, *two; + + if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options)) + return; + + /* This may look odd, but it is a preparation for + * feeding "there are unchanged files which should + * not produce diffs, but when you are doing copy + * detection you would need them, so here they are" + * entries to the diff-core. They will be prefixed + * with something like '=' or '*' (I haven't decided + * which but should not make any difference). + * Feeding the same new and old to diff_change() + * also has the same effect. + * Before the final output happens, they are pruned after + * merged into rename/copy pairs as appropriate. + */ + if (options->flags.reverse_diff) + addremove = (addremove == '+' ? '-' : + addremove == '-' ? '+' : addremove); + + if (options->prefix && + strncmp(concatpath, options->prefix, options->prefix_length)) + return; + + one = alloc_filespec(concatpath); + two = alloc_filespec(concatpath); + + if (addremove != '+') + fill_filespec(one, oid, oid_valid, mode); + if (addremove != '-') { + fill_filespec(two, oid, oid_valid, mode); + two->dirty_submodule = dirty_submodule; + } + + diff_queue(&diff_queued_diff, one, two); + if (!options->flags.diff_from_contents) + options->flags.has_changes = 1; +} + +void diff_change(struct diff_options *options, + unsigned old_mode, unsigned new_mode, + const struct object_id *old_oid, + const struct object_id *new_oid, + int old_oid_valid, int new_oid_valid, + const char *concatpath, + unsigned old_dirty_submodule, unsigned new_dirty_submodule) +{ + struct diff_filespec *one, *two; + struct diff_filepair *p; + + if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) && + is_submodule_ignored(concatpath, options)) + return; + + if (options->flags.reverse_diff) { + SWAP(old_mode, new_mode); + SWAP(old_oid, new_oid); + SWAP(old_oid_valid, new_oid_valid); + SWAP(old_dirty_submodule, new_dirty_submodule); + } + + if (options->prefix && + strncmp(concatpath, options->prefix, options->prefix_length)) + return; + + one = alloc_filespec(concatpath); + two = alloc_filespec(concatpath); + fill_filespec(one, old_oid, old_oid_valid, old_mode); + fill_filespec(two, new_oid, new_oid_valid, new_mode); + one->dirty_submodule = old_dirty_submodule; + two->dirty_submodule = new_dirty_submodule; + p = diff_queue(&diff_queued_diff, one, two); + + if (options->flags.diff_from_contents) + return; + + if (options->flags.quick && options->skip_stat_unmatch && + !diff_filespec_check_stat_unmatch(p)) + return; + + options->flags.has_changes = 1; +} + +struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path) +{ + struct diff_filepair *pair; + struct diff_filespec *one, *two; + + if (options->prefix && + strncmp(path, options->prefix, options->prefix_length)) + return NULL; + + one = alloc_filespec(path); + two = alloc_filespec(path); + pair = diff_queue(&diff_queued_diff, one, two); + pair->is_unmerged = 1; + return pair; +} + +static char *run_textconv(const char *pgm, struct diff_filespec *spec, + size_t *outsize) +{ + struct diff_tempfile *temp; + const char *argv[3]; + const char **arg = argv; + struct child_process child = CHILD_PROCESS_INIT; + struct strbuf buf = STRBUF_INIT; + int err = 0; + + temp = prepare_temp_file(spec->path, spec); + *arg++ = pgm; + *arg++ = temp->name; + *arg = NULL; + + child.use_shell = 1; + child.argv = argv; + child.out = -1; + if (start_command(&child)) { + remove_tempfile(); + return NULL; + } + + if (strbuf_read(&buf, child.out, 0) < 0) + err = error("error reading from textconv command '%s'", pgm); + close(child.out); + + if (finish_command(&child) || err) { + strbuf_release(&buf); + remove_tempfile(); + return NULL; + } + remove_tempfile(); + + return strbuf_detach(&buf, outsize); +} + +size_t fill_textconv(struct userdiff_driver *driver, + struct diff_filespec *df, + char **outbuf) +{ + size_t size; + + if (!driver) { + if (!DIFF_FILE_VALID(df)) { + *outbuf = ""; + return 0; + } + if (diff_populate_filespec(df, 0)) + die("unable to read files to diff"); + *outbuf = df->data; + return df->size; + } + + if (!driver->textconv) + die("BUG: fill_textconv called with non-textconv driver"); + + if (driver->textconv_cache && df->oid_valid) { + *outbuf = notes_cache_get(driver->textconv_cache, + &df->oid, + &size); + if (*outbuf) + return size; + } + + *outbuf = run_textconv(driver->textconv, df, &size); + if (!*outbuf) + die("unable to read files to diff"); + + if (driver->textconv_cache && df->oid_valid) { + /* ignore errors, as we might be in a readonly repository */ + notes_cache_put(driver->textconv_cache, &df->oid, *outbuf, + size); + /* + * we could save up changes and flush them all at the end, + * but we would need an extra call after all diffing is done. + * Since generating a cache entry is the slow path anyway, + * this extra overhead probably isn't a big deal. + */ + notes_cache_write(driver->textconv_cache); + } + + return size; +} + +int textconv_object(const char *path, + unsigned mode, + const struct object_id *oid, + int oid_valid, + char **buf, + unsigned long *buf_size) +{ + struct diff_filespec *df; + struct userdiff_driver *textconv; + + df = alloc_filespec(path); + fill_filespec(df, oid, oid_valid, mode); + textconv = get_textconv(df); + if (!textconv) { + free_filespec(df); + return 0; + } + + *buf_size = fill_textconv(textconv, df, buf); + free_filespec(df); + return 1; +} + +void setup_diff_pager(struct diff_options *opt) +{ + /* + * If the user asked for our exit code, then either they want --quiet + * or --exit-code. We should definitely not bother with a pager in the + * former case, as we will generate no output. Since we still properly + * report our exit code even when a pager is run, we _could_ run a + * pager with --exit-code. But since we have not done so historically, + * and because it is easy to find people oneline advising "git diff + * --exit-code" in hooks and other scripts, we do not do so. + */ + if (!opt->flags.exit_with_status && + check_pager_config("diff") != 0) + setup_pager(); +} |