From 296d4a94e7231a1d57356889f51bff57a1a3c5a1 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Micha=C5=82=20K=C4=99pie=C5=84?= Date: Tue, 20 Oct 2020 08:48:09 +0200 Subject: diff: add -I that ignores matching changes MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a new diff option that enables ignoring changes whose all lines (changed, removed, and added) match a given regular expression. This is similar to the -I/--ignore-matching-lines option in standalone diff utilities and can be used e.g. to ignore changes which only affect code comments or to look for unrelated changes in commits containing a large number of automatically applied modifications (e.g. a tree-wide string replacement). The difference between -G/-S and the new -I option is that the latter filters output on a per-change basis. Use the 'ignore' field of xdchange_t for marking a change as ignored or not. Since the same field is used by --ignore-blank-lines, identical hunk emitting rules apply for --ignore-blank-lines and -I. These two options can also be used together in the same git invocation (they are complementary to each other). Rename xdl_mark_ignorable() to xdl_mark_ignorable_lines(), to indicate that it is logically a "sibling" of xdl_mark_ignorable_regex() rather than its "parent". Signed-off-by: Michał Kępień Signed-off-by: Junio C Hamano --- diff.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'diff.c') diff --git a/diff.c b/diff.c index d24aaa3047..92e247fb83 100644 --- a/diff.c +++ b/diff.c @@ -3584,6 +3584,8 @@ static void builtin_diff(const char *name_a, if (header.len && !o->flags.suppress_diff_headers) ecbdata.header = &header; xpp.flags = o->xdl_opts; + xpp.ignore_regex = o->ignore_regex; + xpp.ignore_regex_nr = o->ignore_regex_nr; xpp.anchors = o->anchors; xpp.anchors_nr = o->anchors_nr; xecfg.ctxlen = o->context; @@ -3711,6 +3713,8 @@ static void builtin_diffstat(const char *name_a, const char *name_b, memset(&xpp, 0, sizeof(xpp)); memset(&xecfg, 0, sizeof(xecfg)); xpp.flags = o->xdl_opts; + xpp.ignore_regex = o->ignore_regex; + xpp.ignore_regex_nr = o->ignore_regex_nr; xpp.anchors = o->anchors; xpp.anchors_nr = o->anchors_nr; xecfg.ctxlen = o->context; @@ -5174,6 +5178,22 @@ static int diff_opt_patience(const struct option *opt, return 0; } +static int diff_opt_ignore_regex(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + regex_t *regex; + + BUG_ON_OPT_NEG(unset); + regex = xmalloc(sizeof(*regex)); + if (regcomp(regex, arg, REG_EXTENDED | REG_NEWLINE)) + return error(_("invalid regex given to -I: '%s'"), arg); + ALLOC_GROW(options->ignore_regex, options->ignore_regex_nr + 1, + options->ignore_regex_alloc); + options->ignore_regex[options->ignore_regex_nr++] = regex; + return 0; +} + static int diff_opt_pickaxe_regex(const struct option *opt, const char *arg, int unset) { @@ -5462,6 +5482,9 @@ static void prep_parse_options(struct diff_options *options) OPT_BIT_F(0, "ignore-blank-lines", &options->xdl_opts, N_("ignore changes whose lines are all blank"), XDF_IGNORE_BLANK_LINES, PARSE_OPT_NONEG), + OPT_CALLBACK_F('I', "ignore-matching-lines", options, N_(""), + N_("ignore changes whose all lines match "), + 0, diff_opt_ignore_regex), OPT_BIT(0, "indent-heuristic", &options->xdl_opts, N_("heuristic to shift diff hunk boundaries for easy reading"), XDF_INDENT_HEURISTIC), -- cgit v1.2.1