[PATCH v3] tab completion of filenames for 'git restore'

From: David Cantrell <david@cantrell.org.uk>

If no --args are present after 'git restore' it assumes that you want to tab-complete one of the files with unstaged uncommitted changes.

If a file has been staged we don't want to list it, as restoring those requires a slightly more complex `git restore --staged`, so we only list those files that are --modified. While --committable also looks like a good candidate, that includes changes that have been staged.

Signed-off-by: David Cantrell <david@cantrell.org.uk>
---
    Improved bash tab completion for 'git restore' - adds support for
    auto-completing filenames
    
    This adds tab-completion of filenames to the bash completions for git
    restore.

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1227%2FDrHyde%2Ffilename-completion-for-git-restore-v3
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1227/DrHyde/filename-completion-for-git-restore-v3
Pull-Request: https://github.com/git/git/pull/1227

Range-diff vs v2:

 1:  2bb8f1cb1c4 ! 1:  779744b9fc5 tab completion of filenames for 'git restore'
     @@ Commit message
          tab completion of filenames for 'git restore'
      
          If no --args are present after 'git restore' it assumes that you want
     -    to tab-complete one of the files with uncommitted changes
     +    to tab-complete one of the files with unstaged uncommitted changes.
     +
     +    If a file has been staged we don't want to list it, as restoring those
     +    requires a slightly more complex `git restore --staged`, so we only list
     +    those files that are --modified. While --committable also looks like
     +    a good candidate, that includes changes that have been staged.
      
          Signed-off-by: David Cantrell <david@cantrell.org.uk>
      
       ## contrib/completion/git-completion.bash ##
      @@ contrib/completion/git-completion.bash: _git_restore ()
     - 	case "$cur" in
     - 	--conflict=*)
     - 		__gitcomp "diff3 merge zdiff3" "" "${cur##--conflict=}"
     -+		return
     - 		;;
     - 	--source=*)
     - 		__git_complete_refs --cur="${cur##--source=}"
     -+		return
     - 		;;
       	--*)
       		__gitcomp_builtin restore
     -+		return
       		;;
     ++	*)
     ++		if __git rev-parse --verify --quiet HEAD >/dev/null; then
     ++			__git_complete_index_file "--modified"
     ++		fi
       	esac
     -+
     -+	if __git rev-parse --verify --quiet HEAD >/dev/null; then
     -+		__git_complete_index_file "--committable"
     -+	fi
       }
       
     - __git_revert_inprogress_options=$__git_sequencer_inprogress_options
 2:  16aa4d0b2e4 < -:  ----------- if a file has been staged we don't want to list it

 contrib/completion/git-completion.bash | 4 ++++
 1 file changed, 4 insertions(+)