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.

agnoster: speed up git prompt
b875df89 · Brian Degenhardt · a207a38d · b875df89
Commit b875df89 authored Jul 27, 2015 by Brian Degenhardt
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agnoster.zsh-theme themes/agnoster.zsh-theme +1 -1

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--- a/themes/agnoster.zsh-theme
+++ b/themes/agnoster.zsh-theme
@@ -78,7 +78,7 @@ prompt_git() {

  if $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then
    dirty=$(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
      prompt_segment yellow black
    else