bash: Complete long options to git-add.

The new --interactive mode of git-add can be very useful, so users
will probably want to have completion for it.

Likewise the new git-add--interactive executable is actually a
plumbing command.  Its invoked by `git add --interactive` and is
not intended to be invoked directly by the user.  Therefore we
should hide it from the list of available Git commands.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

contrib/completion/git-completion.bash

@@ -235,6 +235,7 @@ __git_commands ()
 	for i in $(git help -a|egrep '^ ')
 	do
 		case $i in
+		add--interactive) : plumbing;;
 		cat-file)         : plumbing;;
 		check-ref-format) : plumbing;;
 		commit-tree)      : plumbing;;
@@ -358,6 +359,19 @@ _git_apply ()
 	COMPREPLY=()
 }
 
+_git_add ()
+{
+	local cur="${COMP_WORDS[COMP_CWORD]}"
+	case "$cur" in
+	--*)
+		COMPREPLY=($(compgen -W "
+			--interactive
+			" -- "$cur"))
+		return
+	esac
+	COMPREPLY=()
+}
+
 _git_branch ()
 {
 	local cur="${COMP_WORDS[COMP_CWORD]}"
@@ -786,6 +800,7 @@ _git ()
 
 	case "$command" in
 	am)          _git_am ;;
+	add)         _git_add ;;
 	apply)       _git_apply ;;
 	branch)      _git_branch ;;
 	checkout)    _git_checkout ;;
@@ -852,6 +867,7 @@ complete -o default -o nospace -F _git_log git-whatchanged
 # included the '.exe' suffix.
 #
 if [ Cygwin = "$(uname -o 2>/dev/null)" ]; then
+complete -o default            -F _git_add git-add.exe
 complete -o default            -F _git_apply git-apply.exe
 complete -o default -o nospace -F _git git.exe
 complete -o default            -F _git_branch git-branch.exe