bash completion: Add completion for 'git archive'

Add completions for all long options specified in the docs
    --format= --list --verbose
    --prefix= --remote= --exec=

The --format= long option can be completed with available formats
and the --remote= can be completed with defined remote repositories.
Signed-off-by: NLee Marlow <lee.marlow@gmail.com>
Acked-by: NShawn O. Pearce <spearce@spearce.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -561,6 +561,29 @@ _git_add ()
 	COMPREPLY=()
 }
 
+_git_archive ()
+{
+	local cur="${COMP_WORDS[COMP_CWORD]}"
+	case "$cur" in
+	--format=*)
+		__gitcomp "$(git archive --list)" "" "${cur##--format=}"
+		return
+		;;
+	--remote=*)
+		__gitcomp "$(__git_remotes)" "" "${cur##--remote=}"
+		return
+		;;
+	--*)
+		__gitcomp "
+			--format= --list --verbose
+			--prefix= --remote= --exec=
+			"
+		return
+		;;
+	esac
+	__git_complete_file
+}
+
 _git_bisect ()
 {
 	__git_has_doubledash && return
@@ -1571,6 +1594,7 @@ _git ()
 	am)          _git_am ;;
 	add)         _git_add ;;
 	apply)       _git_apply ;;
+	archive)     _git_archive ;;
 	bisect)      _git_bisect ;;
 	bundle)      _git_bundle ;;
 	branch)      _git_branch ;;