On Fri, May 04, 2018 at 05:35:11PM +0200, Johannes Schindelin wrote:
> Tab completion of `branch-diff` is very convenient, especially given
> that the revision arguments that need to be passed to `git branch-diff`
> are typically more complex than, say, your grandfather's `git log`
> arguments.
> 
> Without this patch, we would only complete the `branch-diff` part but
> not the options and other arguments.
> 
> This of itself may already be slightly disruptive for well-trained
> fingers that assume that `git bra<TAB>ori<TAB>mas<TAB>` would expand to
> `git branch origin/master`, as we now no longer automatically append a
> space after completing `git branch`: this is now ambiguous.
> 
> Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
> ---
>  contrib/completion/git-completion.bash | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/contrib/completion/git-completion.bash 
> b/contrib/completion/git-completion.bash
> index 01dd9ff07a2..45addd525ac 100644
> --- a/contrib/completion/git-completion.bash
> +++ b/contrib/completion/git-completion.bash
> @@ -1496,6 +1496,24 @@ _git_format_patch ()
>       __git_complete_revlist
>  }
>  
> +__git_branch_diff_options="
> +     --no-patches --creation-weight= --dual-color
> +"
> +
> +_git_branch_diff ()
> +{
> +     case "$cur" in
> +     --*)
> +             __gitcomp "

You should use __gitcomp_builtin so you don't have to maintain
$__git_branch_diff_options here. Something like this

-- 8< --
diff --git a/contrib/completion/git-completion.bash 
b/contrib/completion/git-completion.bash
index 45addd525a..4745631daf 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -1496,18 +1496,11 @@ _git_format_patch ()
        __git_complete_revlist
 }
 
-__git_branch_diff_options="
-       --no-patches --creation-weight= --dual-color
-"
-
 _git_branch_diff ()
 {
        case "$cur" in
        --*)
-               __gitcomp "
-                       $__git_branch_diff_options
-                       $__git_diff_common_options
-                       "
+               __gitcomp_builtin branch-diff "$__git_diff_common_options"
                return
                ;;
        esac
-- 8< --


> +                     $__git_branch_diff_options
> +                     $__git_diff_common_options
> +                     "
> +             return
> +             ;;
> +     esac
> +     __git_complete_revlist
> +}
> +
>  _git_fsck ()
>  {
>       case "$cur" in
> -- 
> 2.17.0.409.g71698f11835

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