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 an earlier commit in this series the contents of HEAD is
already read into a local 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
${head:0:7}, hence the "remove everything except the first 7 chars"
parameter expansion combination.
Signed-off-by: SZEDER Gábor <szeder@xxxxxxxxxx>
---
contrib/completion/git-completion.bash | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 671032bf..2346962d 100755
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -310,8 +310,8 @@ __git_ps1 ()
git describe --tags --exact-match HEAD ;;
esac 2>/dev/null)" ||
- b="$(cut -c1-7 "$__git_dir/HEAD" 2>/dev/null)..." ||
- return
+ # detached head abbreviated object name
+ b="${head%${head#???????}}..."
b="($b)"
fi
fi
--
1.7.10.1.541.gb1be298
--
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