completion: Better __git_ps1 support when not in working directory
If .git/HEAD is not readable, __git_ps1 does nothing. If --is-in-git-dir, __git_ps1 returns " (GIT_DIR!)" as a cautionary note. The previous behavior would show the branch name (and would optionally attempt to determine the dirtyState of the directory, which was impossible because a "git diff" was used). If --is-in-work-tree, __git_ps1 returns the branch name. Additionally, if showDirtyState is on, the dirty state is displayed. Signed-off-by: NTed Pavlic <ted@tedpavlic.com> Acked-by: NShawn O. Pearce <spearce@spearce.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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