grep --quiet: finishing touches

Name the option "--quiet" not "--quick", document it, and add tests.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/git-grep.txt

@@ -16,7 +16,7 @@ SYNOPSIS
 	   [-F | --fixed-strings] [-n]
 	   [-l | --files-with-matches] [-L | --files-without-match]
 	   [-z | --null]
-	   [-c | --count] [--all-match]
+	   [-c | --count] [--all-match] [-q | --quiet]
 	   [--max-depth <depth>]
 	   [--color | --no-color]
 	   [-A <post-context>] [-B <pre-context>] [-C <context>]
@@ -158,6 +158,11 @@ OPTIONS
 	this flag is specified to limit the match to files that
 	have lines to match all of them.
 
+-q::
+--quiet::
+	Do not output matched lines; instead, exit with status 0 when
+	there is a match and with non-zero status when there isn't.
+
 `<tree>...`::
 	Search blobs in the trees for specified patterns.
 

builtin-grep.c

@@ -832,7 +832,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 		{ OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
 		  PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
 		  close_callback },
-		OPT_BOOLEAN('q', "quick", &opt.status_only,
+		OPT_BOOLEAN('q', "quiet", &opt.status_only,
 			    "indicate hit with exit status without output"),
 		OPT_BOOLEAN(0, "all-match", &opt.all_match,
 			"show only matches from files that match all patterns"),

t/t7002-grep.sh

@@ -291,6 +291,14 @@ y:y yy
 z:zzz
 EOF
 
+test_expect_success 'grep -q, silently report matches' '
+	>empty &&
+	git grep -q mmap >actual &&
+	test_cmp empty actual &&
+	test_must_fail git grep -q qfwfq >actual &&
+	test_cmp empty actual
+'
+
 # Create 1024 file names that sort between "y" and "z" to make sure
 # the two files are handled by different calls to an external grep.
 # This depends on MAXARGS in builtin-grep.c being 1024 or less.