completion: use __gitcomp_builtin in _git_apply

The new completable options are:

--3way
--allow-overlap
--build-fake-ancestor=
--directory
--exclude
--include

--index-info is no longer completable but that's because it's renamed to
--build-fake-ancestor in 26b2800768 (apply: get rid of --index-info in
favor of --build-fake-ancestor - 2007-09-17)

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

apply.c

@@ -4943,8 +4943,9 @@ int apply_parse_options(int argc, const char **argv,
 			N_("make sure the patch is applicable to the current index")),
 		OPT_BOOL(0, "cached", &state->cached,
 			N_("apply a patch without touching the working tree")),
-		OPT_BOOL(0, "unsafe-paths", &state->unsafe_paths,
+		OPT_BOOL_F(0, "unsafe-paths", &state->unsafe_paths,
-			N_("accept a patch that touches outside the working area")),
+			   N_("accept a patch that touches outside the working area"),
+			   PARSE_OPT_NOCOMPLETE),
 		OPT_BOOL(0, "apply", force_apply,
 			N_("also apply the patch (use with --stat/--summary/--check)")),
 		OPT_BOOL('3', "3way", &state->threeway,

contrib/completion/git-completion.bash

@@ -1134,14 +1134,7 @@ _git_apply ()
 		return
 		;;
 	--*)
-		__gitcomp "
+		__gitcomp_builtin apply
-			--stat --numstat --summary --check --index
-			--cached --index-info --reverse --reject --unidiff-zero
-			--apply --no-add --exclude=
-			--ignore-whitespace --ignore-space-change
-			--whitespace= --inaccurate-eof --verbose
-			--recount --directory=
-			"
 		return
 	esac
 }