[PATCH 1/2] bash prompt: test untracked files status indicator with untracked dirs

The next commit will tweak the way __git_ps1() decides whether to display
the untracked files status indicator in the presence of untracked
directories.  Add tests to make sure it doesn't change current behavior,
in particular that an empty untracked directory doesn't trigger the
untracked files status indicator.

Signed-off-by: SZEDER Gábor <redacted>
---
 t/t9903-bash-prompt.sh | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/t/t9903-bash-prompt.sh b/t/t9903-bash-prompt.sh
index 49d58e6726..6b68777b98 100755
--- a/t/t9903-bash-prompt.sh
+++ b/t/t9903-bash-prompt.sh

@@ -397,6 +397,31 @@ test_expect_success 'prompt - untracked files status indicator - untracked files
 	test_cmp expected "$actual"
 '
 
+test_expect_success 'prompt - untracked files status indicator - empty untracked dir' '
+	printf " (master)" >expected &&
+	mkdir otherrepo/untracked-dir &&
+	test_when_finished "rm -rf otherrepo/untracked-dir" &&
+	(
+		GIT_PS1_SHOWUNTRACKEDFILES=y &&
+		cd otherrepo &&
+		__git_ps1 >"$actual"
+	) &&
+	test_cmp expected "$actual"
+'
+
+test_expect_success 'prompt - untracked files status indicator - non-empty untracked dir' '
+	printf " (master %%)" >expected &&
+	mkdir otherrepo/untracked-dir &&
+	test_when_finished "rm -rf otherrepo/untracked-dir" &&
+	>otherrepo/untracked-dir/untracked-file &&
+	(
+		GIT_PS1_SHOWUNTRACKEDFILES=y &&
+		cd otherrepo &&
+		__git_ps1 >"$actual"
+	) &&
+	test_cmp expected "$actual"
+'
+
 test_expect_success 'prompt - untracked files status indicator - untracked files outside cwd' '
 	printf " (master %%)" >expected &&
 	(

-- 
2.5.0.rc2.15.gd82f7f6

If the untracked status indicator is enabled, __git_ps1() looks for
untracked files by running 'git ls-files'.  This can be perceptibly slow
in case of an untracked directory containing lot of files, because it
lists all files found in the untracked directory only to be redirected
into /dev/null right away (this is the actual command run by __git_ps1()):

  $ ls untracked-dir/ |wc -l
  100000
  $ time git ls-files --others --exclude-standard --error-unmatch \
    -- ':/*' >/dev/null 2>/dev/null

  real	0m0.955s
  user	0m0.936s
  sys	0m0.016s

Eliminate this delay by additionally passing the '--directory
--no-empty-directory' options to 'git ls-files' to show only the name of
non-empty untracked directories instead of all their content:

  $ time git ls-files --others --exclude-standard --directory \
    --no-empty-directory --error-unmatch -- ':/*' >/dev/null 2>/dev/null

  real	0m0.010s
  user	0m0.008s
  sys	0m0.000s

This follows suit of ea95c7b8f5 (completion: improve untracked directory
filtering for filename completion, 2013-09-18).

Signed-off-by: SZEDER Gábor <redacted>
---
 contrib/completion/git-prompt.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
index 366f0bc1e9..07b52bedf1 100644
--- a/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh

@@ -491,7 +491,7 @@ __git_ps1 ()
 
 		if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ] &&
 		   [ "$(git config --bool bash.showUntrackedFiles)" != "false" ] &&
-		   git ls-files --others --exclude-standard --error-unmatch -- ':/*' >/dev/null 2>/dev/null
+		   git ls-files --others --exclude-standard --directory --no-empty-directory --error-unmatch -- ':/*' >/dev/null 2>/dev/null
 		then
 			u="%${ZSH_VERSION+%}"
 		fi

-- 
2.5.0.rc2.15.gd82f7f6