Re: [PATCH v2 06/13] bash prompt: run 'git rev-parse --git-dir' directly instead of __gitdir()

> From: SZEDER Gábor <szeder@ira.uka.de>
>
> __git_ps1() finds out the path to the repository by using the
> __gitdir() helper function.  __gitdir() is basically just a wrapper
> around 'git rev-parse --git-dir', extended with support for
> recognizing a remote repository given as argument, to use the path
> given on the command line, and with a few shortcuts to recognize a git
> repository in cwd or at $GIT_DIR quickly without actually running 'git
> rev-parse'.  However, the former two is only necessary for the
> completion script but makes no sense for the bash prompt, while the
> latter shortcuts are performance optimizations __git_ps1() can do
> without (they just avoid the overhead of fork()+exec()ing a git
> process).
>
> Run 'git rev-parse --git-dir' directly in __git_ps1(), because it will
> allow this patch series to combine several $(git rev-parse ...)
> command substitutions in the main code path, and the overall
> performance benefit will far outweight the loss of those few shortcuts

> in __gitdir().  Furthermore, since __gitdir() is not needed anymore
> for the prompt, remove it from the prompt script finally eliminating
> its duplication between the prompt and completion scripts.  Also
> remove the comment from the completion script warning about this code
> duplication.
>
> Signed-off-by: SZEDER Gábor <szeder@ira.uka.de>