__git_ps1() runs the '$(git symbolic-ref HEAD)' command substitution
to find out whether we are on a branch and to find out the name of
that branch. This imposes the overhead of fork()ing a subshell and
fork()+exec()ing a git process.
Since HEAD is a single-line file and the symbolic ref format is quite
simple to recognize and parse, read and parse it using only bash
builtins, thereby sparing all that fork()+exec() overhead.
Signed-off-by: SZEDER Gábor <szeder@xxxxxxxxxx>
---
contrib/completion/git-completion.bash | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index dd69e56e..ed372c41 100755
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -293,8 +293,11 @@ __git_ps1 ()
r="|BISECTING"
fi
- b="$(git symbolic-ref HEAD 2>/dev/null)" || {
-
+ local head=""
+ read head 2>/dev/null <"$__git_dir/HEAD" || return
+ # is it a symbolic ref?
+ b="${head#ref: }"
+ if [ "$head" = "$b" ]; then
b="$(
case "${GIT_PS1_DESCRIBE_STYLE-}" in
(contains)
@@ -310,7 +313,7 @@ __git_ps1 ()
b="$(cut -c1-7 "$__git_dir/HEAD" 2>/dev/null)..." ||
return
b="($b)"
- }
+ fi
fi
local w=""
--
1.7.10.1.541.gb1be298
--
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