hook: scaffolding for git-hook subcommand

Introduce infrastructure for a new subcommand, git-hook, which will be
used to ease config-based hook management. This command will handle
parsing configs to compose a list of hooks to run for a given event, as
well as adding or modifying hook configs in an interactive fashion.

Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

.gitignore

@@ -75,6 +75,7 @@
 /git-grep
 /git-hash-object
 /git-help
+/git-hook
 /git-http-backend
 /git-http-fetch
 /git-http-push

Documentation/git-hook.txt

@@ -0,0 +1,19 @@
+git-hook(1)
+===========
+
+NAME
+----
+git-hook - Manage configured hooks
+
+SYNOPSIS
+--------
+[verse]
+'git hook'
+
+DESCRIPTION
+-----------
+You can list, add, and modify hooks with this command.
+
+GIT
+---
+Part of the linkgit:git[1] suite

Makefile

@@ -1077,6 +1077,7 @@ BUILTIN_OBJS += builtin/get-tar-commit-id.o
 BUILTIN_OBJS += builtin/grep.o
 BUILTIN_OBJS += builtin/hash-object.o
 BUILTIN_OBJS += builtin/help.o
+BUILTIN_OBJS += builtin/hook.o
 BUILTIN_OBJS += builtin/index-pack.o
 BUILTIN_OBJS += builtin/init-db.o
 BUILTIN_OBJS += builtin/interpret-trailers.o

builtin.h

@@ -157,6 +157,7 @@ int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix);
 int cmd_grep(int argc, const char **argv, const char *prefix);
 int cmd_hash_object(int argc, const char **argv, const char *prefix);
 int cmd_help(int argc, const char **argv, const char *prefix);
+int cmd_hook(int argc, const char **argv, const char *prefix);
 int cmd_index_pack(int argc, const char **argv, const char *prefix);
 int cmd_init_db(int argc, const char **argv, const char *prefix);
 int cmd_interpret_trailers(int argc, const char **argv, const char *prefix);

builtin/hook.c

@@ -0,0 +1,21 @@
+#include "cache.h"
+
+#include "builtin.h"
+#include "parse-options.h"
+
+static const char * const builtin_hook_usage[] = {
+	N_("git hook"),
+	NULL
+};
+
+int cmd_hook(int argc, const char **argv, const char *prefix)
+{
+	struct option builtin_hook_options[] = {
+		OPT_END(),
+	};
+
+	argc = parse_options(argc, argv, prefix, builtin_hook_options,
+			     builtin_hook_usage, 0);
+
+	return 0;
+}

git.c

@@ -517,6 +517,7 @@ static struct cmd_struct commands[] = {
 	{ "grep", cmd_grep, RUN_SETUP_GENTLY },
 	{ "hash-object", cmd_hash_object },
 	{ "help", cmd_help },
+	{ "hook", cmd_hook, RUN_SETUP },
 	{ "index-pack", cmd_index_pack, RUN_SETUP_GENTLY | NO_PARSEOPT },
 	{ "init", cmd_init_db },
 	{ "init-db", cmd_init_db },

t/t1360-config-based-hooks.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+test_description='config-managed multihooks, including git-hook command'
+
+. ./test-lib.sh
+
+test_expect_success 'git hook command does not crash' '
+	git hook
+'
+
+test_done