[PATCH v5 3/3] stash push -u: don't create empty stash

[Thomas Gummerer <t.gummerer@gmail.com>]

When introducing the stash push feature, and thus allowing users to pass
in a pathspec to limit the files that would get stashed in
df6bba0937 ("stash: teach 'push' (and 'create_stash') to honor
pathspec", 2017-02-28), this developer missed one place where the
pathspec should be passed in.

Namely in the call to the 'untracked_files()' function in the
'no_changes()' function.  This resulted in 'git stash push -u --
<non-existant>' creating an empty stash when there are untracked files
in the repository other that don't match the pathspec.

As 'git stash' never creates empty stashes, this behaviour is wrong and
confusing for users.  Instead it should just show a message "No local
changes to save", and not create a stash.

Luckily the 'untracked_files()' function already correctly respects
pathspecs that are passed to it, so the fix is simply to pass the
pathspec along to the function.

Reported-by: Marc Strapetz <marc.strapetz@syntevo.com>
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
---
 git-stash.sh                       | 2 +-
 t/t3905-stash-include-untracked.sh | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/git-stash.sh b/git-stash.sh
index 5e06f96da5..4e55f278bd 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -39,7 +39,7 @@ fi
 no_changes () {
 	git diff-index --quiet --cached HEAD --ignore-submodules -- "$@" &&
 	git diff-files --quiet --ignore-submodules -- "$@" &&
-	(test -z "$untracked" || test -z "$(untracked_files)")
+	(test -z "$untracked" || test -z "$(untracked_files "$@")")
 }
 
 untracked_files () {
diff --git a/t/t3905-stash-include-untracked.sh b/t/t3905-stash-include-untracked.sh
index 2f9045553e..3ea5b9bb3f 100755
--- a/t/t3905-stash-include-untracked.sh
+++ b/t/t3905-stash-include-untracked.sh
@@ -274,4 +274,10 @@ test_expect_success 'stash -u -- <ignored> leaves ignored file alone' '
 	test_path_is_file ignored.d/bar
 '
 
+test_expect_success 'stash -u -- <non-existant> shows no changes when there are none' '
+	git stash push -u -- non-existant >actual &&
+	echo "No local changes to save" >expect &&
+	test_i18ncmp expect actual
+'
+
 test_done
-- 
2.15.1.33.g3165b24a68