Re: [RFC] Add posibility to preload stat information.

From: Phil Hord <phil.hord@gmail.com>
Date: Mar 30, 2013, 19:42 UTC
Message-ID: <CABURp0rAp_s1jDdhohZ44+6RXNW_A4JirAaVwfiCL9Jf2ZmiZA@mail.gmail.com>
In-Reply-To: <7vtxo4byng.fsf@alter.siamese.dyndns.org>

On Thu, Mar 21, 2013 at 10:44 AM, Junio C Hamano <gitster@pobox.com> wrote:

Show 16 quoted lines

> Thomas Rast <trast@student.ethz.ch> writes:
>
>> I think it would actually be a somewhat interesting feature if it
>> interacted with GIT_PS1_SHOW*.  If you use these settings (I personally
>> use SHOWDIRTYSTATE but not SHOWUNTRACKEDFILES), the prompt hangs while
>> __git_ps1 runs git-status.  It should be possible to run a git-status
>> process in the background when entering a repository, and displaying
>> some marker ('??' maybe) in the prompt instead of the dirty-state info
>> until git-status has finished.
>
> This is somewhat interesting.
>
> Perhaps we can introduce a helper binary that does what __git_ps1()
> does, with a --timeout=500ms option to say "I dunno (yet)", and keep
> priming the well in the background when it takes more than the
> specified amount of time?

That would be nice. My fork-fu is weak, so I cheated and relied on kill/timeout instead.

I have had this code below in my zsh git prompt (based on oh-my-zsh) for more than a year. It uses $(timeout) to kill the status command if it does not complete in 1 second. It's dumb in several ways, but it does show me four different flags fairly reliably indicating whether I have changed files, untracked files, clean workdir, or I timed out trying to find out.

git_dirty_timeout () {
  #-- Modified files
  xx=$(timeout 1s git status -s $@ 2> /dev/null)
  test $? -eq 124 && return 124
  test -n ${xx} && return 50

  #-- Untracked files (only)
  xx=$(timeout 1s git status -s -uno $@ 2> /dev/null)
  test $? -eq 124 && return 124
  test -n ${xx} && return 51
  return 0
}

parse_git_dirty () {
  git_dirty_timeout
  case "$?" in
        '50')  echo "$ZSH_THEME_GIT_PROMPT_DIRTY"       ;;
        '51')  echo "$ZSH_THEME_GIT_PROMPT_UNTRACKED"   ;;
        '124') echo "$ZSH_THEME_GIT_PROMPT_TIMEOUT"     ;;
        *)     echo "[$?]$ZSH_THEME_GIT_PROMPT_CLEAN"   ;;
  esac
}