From: SZEDER Gábor <sze...@ira.uka.de>
When describing a detached HEAD according to the $GIT_PS1_DESCRIBE
environment variable fails, __git_ps1() runs the '$(cut -c1-7
.git/HEAD)' command substitution to put the 7 hexdigits abbreviated
commit object name in the prompt. This imposes the overhead of
fork()ing a subshell and fork()+exec()ing 'cut'.
Thanks to the previous patch at this point the contents of HEAD has
already been read into a variable, so we can get the 7 hexdigits using
only parameter expansions, sparing the fork()+exec() overhead.
Since zsh doesn't implement substring expansion we can't just use
${head:0:7}, hence the "remove everything except the first 7 chars"
parameter expansion combination.
Signed-off-by: SZEDER Gábor <sze...@ira.uka.de>
---
contrib/completion/git-prompt.sh | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
index 4e5c8efa..10ec6902 100644
--- a/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh
@@ -378,9 +378,8 @@ __git_ps1 ()
(* | default)
git describe --tags --exact-match HEAD
;;
esac 2>/dev/null)" ||
-
- b="$(cut -c1-7 "$g/HEAD" 2>/dev/null)..." ||
- b="unknown"
+ # detached head abbreviated object name
+ b="${head%${head#???????}}..."
b="($b)"
fi
fi
--
1.8.3.1.487.g8f4672d
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