For cleanliness, "git worktree prune" deletes the .git/worktrees
directory if it is empty after pruning is complete.

For consistency, make "git worktree remove <path>" likewise delete
.git/worktrees if it is empty after the removal.

Signed-off-by: Eric Sunshine <[email protected]>
---
 builtin/worktree.c       |  8 +++++++-
 t/t2028-worktree-move.sh | 12 ++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/builtin/worktree.c b/builtin/worktree.c
index a95fe67da6..c4abbde2b8 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -62,6 +62,11 @@ static int delete_git_dir(const char *id)
        return ret;
 }
 
+static void delete_worktrees_dir_if_empty(void)
+{
+       rmdir(git_path("worktrees")); /* ignore failed removal */
+}
+
 static int prune_worktree(const char *id, struct strbuf *reason)
 {
        struct stat st;
@@ -149,7 +154,7 @@ static void prune_worktrees(void)
        }
        closedir(dir);
        if (!show_only)
-               rmdir(git_path("worktrees"));
+               delete_worktrees_dir_if_empty();
        strbuf_release(&reason);
 }
 
@@ -918,6 +923,7 @@ static int remove_worktree(int ac, const char **av, const 
char *prefix)
         * from here.
         */
        ret |= delete_git_dir(wt->id);
+       delete_worktrees_dir_if_empty();
 
        free_worktrees(worktrees);
        return ret;
diff --git a/t/t2028-worktree-move.sh b/t/t2028-worktree-move.sh
index 1b5079e8fa..33c0337733 100755
--- a/t/t2028-worktree-move.sh
+++ b/t/t2028-worktree-move.sh
@@ -173,4 +173,16 @@ test_expect_success 'remove locked worktree (force)' '
        git worktree remove --force --force gumby
 '
 
+test_expect_success 'remove cleans up .git/worktrees when empty' '
+       git init moog &&
+       (
+               cd moog &&
+               test_commit bim &&
+               git worktree add --detach goom &&
+               test_path_exists .git/worktrees &&
+               git worktree remove goom &&
+               test_path_is_missing .git/worktrees
+       )
+'
+
 test_done
-- 
2.19.0.rc1.350.ge57e33dbd1

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