builtin-grep: -L (--files-without-match).

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/builtin-grep.c b/builtin-grep.c
index 0d6115763bf3c9f409518daa000f51951a7f0c95..c89ee33a1ede4e032cae850315ee2b2185a64457 100644 (file)
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -93,6 +93,7 @@ struct grep_opt {
        unsigned linenum:1;
        unsigned invert:1;
        unsigned name_only:1;
+       unsigned unmatch_name_only:1;
        unsigned count:1;
        unsigned word_regexp:1;
 #define GREP_BINARY_DEFAULT    0
@@ -241,6 +242,11 @@ static int grep_buffer(struct grep_opt *opt, const char *name,
                 */
                if (opt->invert)
                        hit = !hit;
+               if (opt->unmatch_name_only) {
+                       if (hit)
+                               return 0;
+                       goto next_line;
+               }
                if (hit) {
                        count++;
                        if (binary_match_only) {
@@ -297,6 +303,8 @@ static int grep_buffer(struct grep_opt *opt, const char *name,
                        prev->bol = bol;
                        prev->eol = eol;
                }
+
+       next_line:
                *eol = ch;
                bol = eol + 1;
                if (!left)
@@ -304,6 +312,13 @@ static int grep_buffer(struct grep_opt *opt, const char *name,
                left--;
                lno++;
        }
+
+       if (opt->unmatch_name_only) {
+               /* We did not see any hit, so we want to show this */
+               printf("%s\n", name);
+               return 1;
+       }
+
        /* NEEDSWORK:
         * The real "grep -c foo *.c" gives many "bar.c:0" lines,
         * which feels mostly useless but sometimes useful.  Maybe
@@ -532,6 +547,11 @@ int cmd_grep(int argc, const char **argv, char **envp)
                        opt.name_only = 1;
                        continue;
                }
+               if (!strcmp("-L", arg) ||
+                   !strcmp("--files-without-match", arg)) {
+                       opt.unmatch_name_only = 1;
+                       continue;
+               }
                if (!strcmp("-c", arg) ||
                    !strcmp("--count", arg)) {
                        opt.count = 1;