Three completion functions, namely __git_index_files(), __git_heads()
and __git_tags(), first run __gitdir() and check that the path it
outputs exists, i.e. that there is a git repository, and run a git
command only if there is one.

After the previous changes in this series there are no further uses of
__gitdir()'s output in these functions besides those checks.  And
those checks are unnecessary, because we can just execute those git
commands outside of a repository and let them error out.  We don't
perform such a check in other places either.

Remove this check and the __gitdir() call from these functions,
sparing the fork()+exec() overhead of the command substitution and the
potential 'git rev-parse' execution.

Signed-off-by: SZEDER Gábor <szeder....@gmail.com>
---
 contrib/completion/git-completion.bash | 32 +++++++++++---------------------
 1 file changed, 11 insertions(+), 21 deletions(-)

diff --git a/contrib/completion/git-completion.bash 
b/contrib/completion/git-completion.bash
index 1a849761f..1c7493ff2 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -312,35 +312,25 @@ __git_ls_files_helper ()
 #    slash.
 __git_index_files ()
 {
-       local dir="$(__gitdir)" root="${2-.}" file
-
-       if [ -d "$dir" ]; then
-               __git_ls_files_helper "$root" "$1" |
-               while read -r file; do
-                       case "$file" in
-                       ?*/*) echo "${file%%/*}" ;;
-                       *) echo "$file" ;;
-                       esac
-               done | sort | uniq
-       fi
+       local root="${2-.}" file
+
+       __git_ls_files_helper "$root" "$1" |
+       while read -r file; do
+               case "$file" in
+               ?*/*) echo "${file%%/*}" ;;
+               *) echo "$file" ;;
+               esac
+       done | sort | uniq
 }
 
 __git_heads ()
 {
-       local dir="$(__gitdir)"
-       if [ -d "$dir" ]; then
-               __git for-each-ref --format='%(refname:short)' refs/heads
-               return
-       fi
+       __git for-each-ref --format='%(refname:short)' refs/heads
 }
 
 __git_tags ()
 {
-       local dir="$(__gitdir)"
-       if [ -d "$dir" ]; then
-               __git for-each-ref --format='%(refname:short)' refs/tags
-               return
-       fi
+       __git for-each-ref --format='%(refname:short)' refs/tags
 }
 
 # Lists refs from the local (by default) or from a remote repository.
-- 
2.11.0.555.g967c1bcb3

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