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agnoster: speed up git prompt

Problem

On detached-refs, the git prompt is very slow because it uses a command
to output all refs, which takes 32s on the twitter internal git repo.

Solution

Use git-rev-parse instead of git-show-ref to only output the head ref.
Runtime drops to 0.03 seconds.

Note

Interestingly, git-rev-parse isn't slow without the --head arguement so
I'll probably be cooking up a patch for the git team to speed this up
eventually, but it's still pointless to sigpipe git as it walks the
filesystem.
This commit is contained in:
Brian Degenhardt 2015-07-27 14:19:23 -07:00
parent a207a38d63
commit b875df8970

View file

@ -78,7 +78,7 @@ prompt_git() {
if $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then if $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then
dirty=$(parse_git_dirty) dirty=$(parse_git_dirty)
ref=$(git symbolic-ref HEAD 2> /dev/null) || ref="➦ $(git show-ref --head -s --abbrev |head -n1 2> /dev/null)" ref=$(git symbolic-ref HEAD 2> /dev/null) || ref="➦ $(git rev-parse --short HEAD 2> /dev/null)"
if [[ -n $dirty ]]; then if [[ -n $dirty ]]; then
prompt_segment yellow black prompt_segment yellow black
else else