stash: allow "git stash [<options>] --patch <pathspec>" to assume push

The support for assuming "push" when "-p" is given introduced in
9e14090 (stash: allow pathspecs in the no verb form, 2017-02-28) is
very narrow, neither "git stash -m <message> -p <pathspec>" nor "git
stash --patch <pathspec>" imply "push" and die instead. Relax this by
passing PARSE_OPT_STOP_AT_NON_OPTION when push is being assumed and then
setting "force_assume" if "--patch" was present. This means "git stash
<pathspec> -p" still dies so that it does not assume the user meant
"push" if they mistype a subcommand name but "git stash -m <message> -p
<pathspec>" will now succeed. The test added in the last commit is
adjusted to check that push is still assumed when "--patch" comes after
other options on the command-line.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: phillipwood

builtin/stash.c

@@ -1789,11 +1789,15 @@ static int push_stash(int argc, const char **argv, const char *prefix,
 	int ret;
 
 	if (argc) {
-		force_assume = argc > 1 && !strcmp(argv[1], "-p");
+		int flags = PARSE_OPT_KEEP_DASHDASH;
+
+		if (push_assumed)
+			flags |= PARSE_OPT_STOP_AT_NON_OPTION;
+
 		argc = parse_options(argc, argv, prefix, options,
 				     push_assumed ? git_stash_usage :
-				     git_stash_push_usage,
-				     PARSE_OPT_KEEP_DASHDASH);
+				     git_stash_push_usage, flags);
+		force_assume |= patch_mode;
 	}
 
 	if (argc) {

t/t3903-stash.sh

@@ -1177,13 +1177,13 @@ test_expect_success 'stash -- <pathspec> stashes and restores the file' '
 	test_path_is_file bar
 '
 
-test_expect_success 'stash -p <pathspec> stash and restores the file' '
+test_expect_success 'stash --patch <pathspec> stash and restores the file' '
 	test_write_lines b c >file &&
 	git commit -m "add a few lines" file &&
 	test_write_lines a b c d >file &&
 	test_write_lines b c d >expect-file &&
 	echo changed-other-file >other-file &&
-	test_write_lines s y n | git stash -p file &&
+	test_write_lines s y n | git stash -m "stash bar" --patch file &&
 	test_cmp expect-file file &&
 	echo changed-other-file >expect &&
 	test_cmp expect other-file &&