[PATCH v2 0/3] git-completion.bash: improvements to _git_stash()

This series modernises the _git_stash() completion handler by letting it take advantage of __gitcomp_builtin(). Also, it fixes a bug with how completions are offered when arguments are provided to the main git command.

Changes since v1:

* Fix the hardcoded $cword comparisons in a more generic way

Denton Liu (3):
  git-completion.bash: pass $__git_subcommand_idx from __git_main()
  git-completion.bash: extract from else in _git_stash()
  git-completion.bash: use __gitcomp_builtin() in _git_stash()

 contrib/completion/git-completion.bash | 122 ++++++++++++-------------
 1 file changed, 60 insertions(+), 62 deletions(-)

Range-diff against v1:
-:  ---------- > 1:  e4aa3e8cd7 git-completion.bash: pass $__git_subcommand_idx from __git_main()
1:  a2d9bc4a66 ! 2:  430d5acf97 git-completion.bash: extract from else in _git_stash()
    @@ contrib/completion/git-completion.bash: _git_stash ()
     -		branch,--*)
     -			;;
     -		branch,*)
    --			if [ $cword -eq 3 ]; then
    +-			if [ $cword -eq $((__git_subcommand_idx+2)) ]; then
     -				__git_complete_refs
     -			else
     -				__gitcomp_nl "$(__git stash list \
    @@ contrib/completion/git-completion.bash: _git_stash ()
     +	branch,--*)
     +		;;
     +	branch,*)
    -+		if [ $cword -eq 3 ]; then
    ++		if [ $cword -eq $((__git_subcommand_idx+2)) ]; then
     +			__git_complete_refs
     +		else
      			__gitcomp_nl "$(__git stash list \
2:  be727d0171 < -:  ---------- git-completion.bash: fix `git <args>... stash branch` bug
3:  d6deaecc1f ! 3:  680f3a3146 git-completion.bash: use __gitcomp_builtin() in _git_stash()
    @@ Commit message
         subcommand is given, it automatically defaults to `git stash push`. This
         means that we can simplify the logic for when no subcommands have been
         given yet. We only have to offer subcommand completions when we're
    -    completing the word after "stash". Unfortunately, this does not work
    -    100% correctly. For example, in the case of something like `git -C stash
    -    stash<TAB>`, this will incorrectly identify the first "stash" as the
    -    command. This seems to be an edge-case that we can ignore, though, as
    -    other functions, such as _git_worktree(), suffer from the same problem.
    +    completing a non-option after "stash".
     
         One area that this patch could improve upon is that the `git stash list`
         command accepts log-options. It would be nice if the completion for this
    @@ contrib/completion/git-completion.bash: _git_sparse_checkout ()
     -	local save_opts='--all --keep-index --no-keep-index --quiet --patch --include-untracked'
      	local subcommands='push list show apply clear drop pop create branch'
      	local subcommand="$(__git_find_on_cmdline "$subcommands save")"
    - 	local stash_idx="$(__git_find_on_cmdline --show-idx stash)"
    - 	stash_idx="${stash_idx% *}"
    - 
     -	if [ -z "$subcommand" -a -n "$(__git_find_on_cmdline "-p")" ]; then
     -		subcommand="push"
     -	fi
    ++
      	if [ -z "$subcommand" ]; then
     -		case "$cur" in
     -		--*)
     -			__gitcomp "$save_opts"
    -+		case "$((cword - stash_idx)),$cur" in
    ++		case "$((cword - __git_subcommand_idx)),$cur" in
     +		*,--*)
     +			__gitcomp_builtin stash_push
      			;;
    @@ contrib/completion/git-completion.bash: _git_stash ()
     +		__gitcomp_builtin stash_branch
      		;;
      	branch,*)
    - 		if [ $((cword - stash_idx)) -eq 2 ]; then
    + 		if [ $cword -eq $((__git_subcommand_idx+2)) ]; then