Re: [PATCH v4 1/3] completion: no-op refactoring of diff completion

>
> The "git diff" completion function punts very early when it sees
> "--" on the command line, since it is a sign that options or
> revisions can appear and the current completion does not need to do
> anything "git diff" specific. By returning, it lets Bash default
> action that completes the names of the files in $PWD to kick in.
>
> In preparation for the next step to change what happens when we
> "punt", arrange the code flow to avoid this early return.  The
> behaviour at this step is unchanged, but the control flow just
> falls straight to the end.
>
> Signed-off-by: Junio C Hamano <gitster@pobox.com>
> ---
>  contrib/completion/git-completion.bash | 61 ++++++++++++++------------
>  1 file changed, 33 insertions(+), 28 deletions(-)
>
> diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
> index e875787710..ccd3b2a372 100644
> --- a/contrib/completion/git-completion.bash
> +++ b/contrib/completion/git-completion.bash
> @@ -1947,35 +1947,40 @@ __git_diff_difftool_options="--cached --staged
>
>  _git_diff ()
>  {

> +       if ! __git_has_doubledash; then
> +               case "$cur" in
> +               --diff-algorithm=*)
> +                       __gitcomp "$__git_diff_algorithms" \
> +                               "" "${cur##--diff-algorithm=}"
> +                       return
>                 ;;