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builtin-grep: workaround for non GNU grep.

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Of course, it still ignores the fact that not all grep's support some of
the flags like -F/-L/-A/-C etc, but for those cases, the external grep
itself will happily just say "unrecognized option -F" or similar.

So with this change, "git grep" should handle all the flags the native
grep handles, which is really quite fine. We don't _need_ to expose
anything more, and if you do want our extensions, you can get them with
"--uncached" and an up-to-date index.

No configuration necessary, and we automatically take advantage of any
native grep we have, if possible.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Linus Torvalds 2006-05-17 11:12:22 -07:00 committed by Junio C Hamano
parent e9ce27543d
commit bbb66c6061
1 changed files with 20 additions and 3 deletions
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23
builtin-grep.c
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@ -453,7 +453,6 @@ static int external_grep(struct grep_opt *opt, const char **paths, int cached)
len = nr = 0;
push_arg("grep");
push_arg("-H");
if (opt->fixed)
push_arg("-F");
if (opt->linenum)
@ -503,17 +502,35 @@ static int external_grep(struct grep_opt *opt, const char **paths, int cached)
push_arg("-e");
push_arg(p->pattern);
}
push_arg("--");
/*
* To make sure we get the header printed out when we want it,
* add /dev/null to the paths to grep. This is unnecessary
* (and wrong) with "-l" or "-L", which always print out the
* name anyway.
*
* GNU grep has "-H", but this is portable.
*/
if (!opt->name_only && !opt->unmatch_name_only)
push_arg("/dev/null");
hit = 0;
argc = nr;
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce = active_cache[i];
const char *name;
if (ce_stage(ce) || !S_ISREG(ntohl(ce->ce_mode)))
continue;
if (!pathspec_matches(paths, ce->name))
continue;
argv[argc++] = ce->name;
name = ce->name;
if (name[0] == '-') {
int len = ce_namelen(ce);
name = xmalloc(len + 3);
memcpy(name, "./", 2);
memcpy(name + 2, ce->name, len + 1);
}
argv[argc++] = name;
if (argc < MAXARGS)
continue;
hit += exec_grep(argc, argv);