From: =?UTF-8?q?Carlos=20L=C3=B3pez?= <00xc@xxxxxxxxxxxxxx>
This patch adds a command line option analogous to that of GNU
grep(1)'s -m / --max-count, which users might already be used to.
This makes it possible to limit the amount of matches shown in the
output while keeping the functionality of other options such as -C
(show code context) or -p (show containing function), which would be
difficult to do with a shell pipeline (e.g. head(1)).
Signed-off-by: Carlos López 00xc@xxxxxxxxxxxxxx
---
Documentation/git-grep.txt | 9 +++++++++
builtin/grep.c | 9 +++++++++
grep.c | 2 +-
grep.h | 2 ++
4 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/Documentation/git-grep.txt b/Documentation/git-grep.txt
index 3d393fbac1b..58d944bd578 100644
--- a/Documentation/git-grep.txt
+++ b/Documentation/git-grep.txt
@@ -23,6 +23,7 @@ SYNOPSIS
[--break] [--heading] [-p | --show-function]
[-A <post-context>] [-B <pre-context>] [-C <context>]
[-W | --function-context]
+ [(-m | --max-count) <num>]
[--threads <num>]
[-f <file>] [-e] <pattern>
[--and|--or|--not|(|)|-e <pattern>...]
@@ -238,6 +239,14 @@ providing this option will cause it to die.
`git diff` works out patch hunk headers (see 'Defining a
custom hunk-header' in linkgit:gitattributes[5]).
+-m <num>::
+--max-count <num>::
+ Limit the amount of matches per file. When using the `-v` or
+ `--invert-match` option, the search stops after the specified
+ number of non-matches. A value of -1 will return unlimited
+ results (the default). A value of 0 will exit immediately with
+ a non-zero status.
+
--threads <num>::
Number of grep worker threads to use.
See `grep.threads` in 'CONFIGURATION' for more information.
diff --git a/builtin/grep.c b/builtin/grep.c
index bcb07ea7f75..e6bcdf860cc 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -961,6 +961,8 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
OPT_BOOL_F(0, "ext-grep", &external_grep_allowed__ignored,
N_("allow calling of grep(1) (ignored by this build)"),
PARSE_OPT_NOCOMPLETE),
+ OPT_INTEGER('m', "max-count", &opt.max_count,
+ N_("maximum number of results per file")),
OPT_END()
};
grep_prefix = prefix;
@@ -1101,6 +1103,13 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
if (recurse_submodules && untracked)
die(_("--untracked not supported with --recurse-submodules"));
+ /*
+ * Optimize out the case where the amount of matches is limited to zero.
+ * We do this to keep results consistent with GNU grep(1).
+ */
+ if (opt.max_count == 0)
+ return 1;
+
if (show_in_pager) {
if (num_threads > 1)
warning(_("invalid option combination, ignoring --threads"));
diff --git a/grep.c b/grep.c
index 82eb7da1022..52a894c9890 100644
--- a/grep.c
+++ b/grep.c
@@ -1615,7 +1615,7 @@ static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int colle
return 0;
goto next_line;
}
- if (hit) {
+ if (hit && (opt->max_count < 0 || count < opt->max_count)) {
count++;
if (opt->status_only)
return 1;
diff --git a/grep.h b/grep.h
index c722d25ed9d..bdcadce61b8 100644
--- a/grep.h
+++ b/grep.h
@@ -171,6 +171,7 @@ struct grep_opt {
int show_hunk_mark;
int file_break;
int heading;
+ int max_count;
void *priv;
void (*output)(struct grep_opt *opt, const void *data, size_t size);
@@ -181,6 +182,7 @@ struct grep_opt {
.relative = 1, \
.pathname = 1, \
.max_depth = -1, \
+ .max_count = -1, \
.pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED, \
.colors = { \
[GREP_COLOR_CONTEXT] = "", \
--
gitgitgadget
