From a5a818ee4877e4458e8e6741a03ac3b19941d58a Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Mon, 18 Aug 2008 20:08:09 -0700 Subject: diff: vary default prefix depending on what are compared With a new configuration "diff.mnemonicprefix", "git diff" shows the differences between various combinations of preimage and postimage trees with prefixes different from the standard "a/" and "b/". Hopefully this will make the distinction stand out for some people. "git diff" compares the (i)ndex and the (w)ork tree; "git diff HEAD" compares a (c)ommit and the (w)ork tree; "git diff --cached" compares a (c)ommit and the (i)ndex; "git-diff HEAD:file1 file2" compares an (o)bject and a (w)ork tree entity; "git diff --no-index a b" compares two non-git things (1) and (2). Because these mnemonics now have meanings, they are swapped when reverse diff is in effect and this feature is enabled. Signed-off-by: Junio C Hamano diff --git a/Documentation/config.txt b/Documentation/config.txt index 81f9815..74af36d 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -581,6 +581,22 @@ diff.external:: you want to use an external diff program only on a subset of your files, you might want to use linkgit:gitattributes[5] instead. +diff.mnemonicprefix:: + If set, 'git-diff' uses a prefix pair that is different from the + standard "a/" and "b/" depending on what is being compared. When + this configuration is in effect, reverse diff output also swaps + the order of the prefixes: +'git-diff';; + compares the (i)ndex and the (w)ork tree; +'git-diff HEAD';; + compares a (c)ommit and the (w)ork tree; +'git diff --cached';; + compares a (c)ommit and the (i)ndex; +'git-diff HEAD:file1 file2';; + compares an (o)bject and a (w)ork tree entity; +'git diff --no-index a b';; + compares two non-git things (1) and (2). + diff.renameLimit:: The number of files to consider when performing the copy/rename detection; equivalent to the 'git-diff' option '-l'. diff --git a/builtin-diff.c b/builtin-diff.c index 7ffea97..266337b 100644 --- a/builtin-diff.c +++ b/builtin-diff.c @@ -74,6 +74,8 @@ static int builtin_diff_b_f(struct rev_info *revs, if (!(S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))) die("'%s': not a regular file or symlink", path); + diff_set_mnemonic_prefix(&revs->diffopt, "o/", "w/"); + if (blob[0].mode == S_IFINVALID) blob[0].mode = canon_mode(st.st_mode); diff --git a/combine-diff.c b/combine-diff.c index 4dfc330..19bd60e 100644 --- a/combine-diff.c +++ b/combine-diff.c @@ -675,9 +675,13 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent, int i, show_hunks; int working_tree_file = is_null_sha1(elem->sha1); int abbrev = DIFF_OPT_TST(opt, FULL_INDEX) ? 40 : DEFAULT_ABBREV; + const char *a_prefix, *b_prefix; mmfile_t result_file; context = opt->context; + a_prefix = opt->a_prefix ? opt->a_prefix : "a/"; + b_prefix = opt->b_prefix ? opt->b_prefix : "b/"; + /* Read the result of merge first */ if (!working_tree_file) result = grab_blob(elem->sha1, &result_size); @@ -853,13 +857,13 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent, dump_quoted_path("--- ", "", "/dev/null", c_meta, c_reset); else - dump_quoted_path("--- ", opt->a_prefix, elem->path, + dump_quoted_path("--- ", a_prefix, elem->path, c_meta, c_reset); if (deleted) dump_quoted_path("+++ ", "", "/dev/null", c_meta, c_reset); else - dump_quoted_path("+++ ", opt->b_prefix, elem->path, + dump_quoted_path("+++ ", b_prefix, elem->path, c_meta, c_reset); dump_sline(sline, cnt, num_parent, DIFF_OPT_TST(opt, COLOR_DIFF)); diff --git a/diff-lib.c b/diff-lib.c index e7eaff9..ae96c64 100644 --- a/diff-lib.c +++ b/diff-lib.c @@ -63,6 +63,8 @@ int run_diff_files(struct rev_info *revs, unsigned int option) ? CE_MATCH_RACY_IS_DIRTY : 0); char symcache[PATH_MAX]; + diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/"); + if (diff_unmerged_stage < 0) diff_unmerged_stage = 2; entries = active_nr; @@ -469,6 +471,7 @@ int run_diff_index(struct rev_info *revs, int cached) if (unpack_trees(1, &t, &opts)) exit(128); + diff_set_mnemonic_prefix(&revs->diffopt, "c/", cached ? "i/" : "w/"); diffcore_std(&revs->diffopt); diff_flush(&revs->diffopt); return 0; diff --git a/diff-no-index.c b/diff-no-index.c index 7d68b7f..b60d345 100644 --- a/diff-no-index.c +++ b/diff-no-index.c @@ -252,6 +252,7 @@ void diff_no_index(struct rev_info *revs, if (queue_diff(&revs->diffopt, revs->diffopt.paths[0], revs->diffopt.paths[1])) exit(1); + diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/"); diffcore_std(&revs->diffopt); diff_flush(&revs->diffopt); diff --git a/diff.c b/diff.c index 7b4300a..c1804ef 100644 --- a/diff.c +++ b/diff.c @@ -23,6 +23,7 @@ static int diff_rename_limit_default = 200; int diff_use_color_default = -1; static const char *external_diff_cmd_cfg; int diff_auto_refresh_index = 1; +static int diff_mnemonic_prefix; static char diff_colors[][COLOR_MAXLEN] = { "\033[m", /* reset */ @@ -149,6 +150,10 @@ int git_diff_ui_config(const char *var, const char *value, void *cb) 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.external")) return git_config_string(&external_diff_cmd_cfg, var, value); if (!prefixcmp(var, "diff.")) { @@ -305,6 +310,15 @@ static void emit_rewrite_diff(const char *name_a, const char *new = diff_get_color(color_diff, DIFF_FILE_NEW); const char *reset = diff_get_color(color_diff, DIFF_RESET); static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT; + const char *a_prefix, *b_prefix; + + if (diff_mnemonic_prefix && DIFF_OPT_TST(o, 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 == '/'); @@ -313,8 +327,8 @@ static void emit_rewrite_diff(const char *name_a, strbuf_reset(&a_name); strbuf_reset(&b_name); - quote_two_c_style(&a_name, o->a_prefix, name_a, 0); - quote_two_c_style(&b_name, o->b_prefix, name_b, 0); + quote_two_c_style(&a_name, a_prefix, name_a, 0); + quote_two_c_style(&b_name, b_prefix, name_b, 0); diff_populate_filespec(one, 0); diff_populate_filespec(two, 0); @@ -1432,6 +1446,14 @@ static const char *diff_funcname_pattern(struct diff_filespec *one) return 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; +} + static void builtin_diff(const char *name_a, const char *name_b, struct diff_filespec *one, @@ -1445,9 +1467,19 @@ static void builtin_diff(const char *name_a, char *a_one, *b_two; const char *set = diff_get_color_opt(o, DIFF_METAINFO); const char *reset = diff_get_color_opt(o, DIFF_RESET); + const char *a_prefix, *b_prefix; + + diff_set_mnemonic_prefix(o, "a/", "b/"); + if (DIFF_OPT_TST(o, REVERSE_DIFF)) { + a_prefix = o->b_prefix; + b_prefix = o->a_prefix; + } else { + a_prefix = o->a_prefix; + b_prefix = o->b_prefix; + } - a_one = quote_two(o->a_prefix, name_a + (*name_a == '/')); - b_two = quote_two(o->b_prefix, name_b + (*name_b == '/')); + 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"; fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset); @@ -2308,8 +2340,10 @@ void diff_setup(struct diff_options *options) DIFF_OPT_CLR(options, COLOR_DIFF); options->detect_rename = diff_detect_rename_default; - options->a_prefix = "a/"; - options->b_prefix = "b/"; + if (!diff_mnemonic_prefix) { + options->a_prefix = "a/"; + options->b_prefix = "b/"; + } } int diff_setup_done(struct diff_options *options) diff --git a/diff.h b/diff.h index 50fb5dd..9a679f5 100644 --- a/diff.h +++ b/diff.h @@ -160,6 +160,8 @@ extern void diff_tree_combined(const unsigned char *sha1, const unsigned char pa extern void diff_tree_combined_merge(const unsigned char *sha1, int, struct rev_info *); +void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b); + extern void diff_addremove(struct diff_options *, int addremove, unsigned mode, -- cgit v0.10.2-6-g49f6