1 files changed, 247 insertions, 0 deletions
diff --git a/builtin/revert.c b/builtin/revert.c
new file mode 100644
index 000000000000..f61cc5d82cf2
--- /dev/null
+++ b/builtin/revert.c
@@ -0,0 +1,247 @@
+#include "cache.h"
+#include "config.h"
+#include "builtin.h"
+#include "parse-options.h"
+#include "diff.h"
+#include "revision.h"
+#include "rerere.h"
+#include "dir.h"
+#include "sequencer.h"
+#include "branch.h"
+
+/*
+ * This implements the builtins revert and cherry-pick.
+ *
+ * Copyright (c) 2007 Johannes E. Schindelin
+ *
+ * Based on git-revert.sh, which is
+ *
+ * Copyright (c) 2005 Linus Torvalds
+ * Copyright (c) 2005 Junio C Hamano
+ */
+
+static const char * const revert_usage[] = {
+	N_("git revert [<options>] <commit-ish>..."),
+	N_("git revert <subcommand>"),
+	NULL
+};
+
+static const char * const cherry_pick_usage[] = {
+	N_("git cherry-pick [<options>] <commit-ish>..."),
+	N_("git cherry-pick <subcommand>"),
+	NULL
+};
+
+static const char *action_name(const struct replay_opts *opts)
+{
+	return opts->action == REPLAY_REVERT ? "revert" : "cherry-pick";
+}
+
+static const char * const *revert_or_cherry_pick_usage(struct replay_opts *opts)
+{
+	return opts->action == REPLAY_REVERT ? revert_usage : cherry_pick_usage;
+}
+
+static int option_parse_x(const struct option *opt,
+			  const char *arg, int unset)
+{
+	struct replay_opts **opts_ptr = opt->value;
+	struct replay_opts *opts = *opts_ptr;
+
+	if (unset)
+		return 0;
+
+	ALLOC_GROW(opts->xopts, opts->xopts_nr + 1, opts->xopts_alloc);
+	opts->xopts[opts->xopts_nr++] = xstrdup(arg);
+	return 0;
+}
+
+static int option_parse_m(const struct option *opt,
+			  const char *arg, int unset)
+{
+	struct replay_opts *replay = opt->value;
+	char *end;
+
+	if (unset) {
+		replay->mainline = 0;
+		return 0;
+	}
+
+	replay->mainline = strtol(arg, &end, 10);
+	if (*end || replay->mainline <= 0)
+		return error(_("option `%s' expects a number greater than zero"),
+			     opt->long_name);
+
+	return 0;
+}
+
+LAST_ARG_MUST_BE_NULL
+static void verify_opt_compatible(const char *me, const char *base_opt, ...)
+{
+	const char *this_opt;
+	va_list ap;
+
+	va_start(ap, base_opt);
+	while ((this_opt = va_arg(ap, const char *))) {
+		if (va_arg(ap, int))
+			break;
+	}
+	va_end(ap);
+
+	if (this_opt)
+		die(_("%s: %s cannot be used with %s"), me, this_opt, base_opt);
+}
+
+static int run_sequencer(int argc, const char **argv, struct replay_opts *opts)
+{
+	const char * const * usage_str = revert_or_cherry_pick_usage(opts);
+	const char *me = action_name(opts);
+	const char *cleanup_arg = NULL;
+	int cmd = 0;
+	struct option base_options[] = {
+		OPT_CMDMODE(0, "quit", &cmd, N_("end revert or cherry-pick sequence"), 'q'),
+		OPT_CMDMODE(0, "continue", &cmd, N_("resume revert or cherry-pick sequence"), 'c'),
+		OPT_CMDMODE(0, "abort", &cmd, N_("cancel revert or cherry-pick sequence"), 'a'),
+		OPT_CMDMODE(0, "skip", &cmd, N_("skip current commit and continue"), 's'),
+		OPT_CLEANUP(&cleanup_arg),
+		OPT_BOOL('n', "no-commit", &opts->no_commit, N_("don't automatically commit")),
+		OPT_BOOL('e', "edit", &opts->edit, N_("edit the commit message")),
+		OPT_NOOP_NOARG('r', NULL),
+		OPT_BOOL('s', "signoff", &opts->signoff, N_("add Signed-off-by:")),
+		OPT_CALLBACK('m', "mainline", opts, N_("parent-number"),
+			     N_("select mainline parent"), option_parse_m),
+		OPT_RERERE_AUTOUPDATE(&opts->allow_rerere_auto),
+		OPT_STRING(0, "strategy", &opts->strategy, N_("strategy"), N_("merge strategy")),
+		OPT_CALLBACK('X', "strategy-option", &opts, N_("option"),
+			N_("option for merge strategy"), option_parse_x),
+		{ OPTION_STRING, 'S', "gpg-sign", &opts->gpg_sign, N_("key-id"),
+		  N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
+		OPT_END()
+	};
+	struct option *options = base_options;
+
+	if (opts->action == REPLAY_PICK) {
+		struct option cp_extra[] = {
+			OPT_BOOL('x', NULL, &opts->record_origin, N_("append commit name")),
+			OPT_BOOL(0, "ff", &opts->allow_ff, N_("allow fast-forward")),
+			OPT_BOOL(0, "allow-empty", &opts->allow_empty, N_("preserve initially empty commits")),
+			OPT_BOOL(0, "allow-empty-message", &opts->allow_empty_message, N_("allow commits with empty messages")),
+			OPT_BOOL(0, "keep-redundant-commits", &opts->keep_redundant_commits, N_("keep redundant, empty commits")),
+			OPT_END(),
+		};
+		options = parse_options_concat(options, cp_extra);
+	}
+
+	argc = parse_options(argc, argv, NULL, options, usage_str,
+			PARSE_OPT_KEEP_ARGV0 |
+			PARSE_OPT_KEEP_UNKNOWN);
+
+	/* implies allow_empty */
+	if (opts->keep_redundant_commits)
+		opts->allow_empty = 1;
+
+	if (cleanup_arg) {
+		opts->default_msg_cleanup = get_cleanup_mode(cleanup_arg, 1);
+		opts->explicit_cleanup = 1;
+	}
+
+	/* Check for incompatible command line arguments */
+	if (cmd) {
+		char *this_operation;
+		if (cmd == 'q')
+			this_operation = "--quit";
+		else if (cmd == 'c')
+			this_operation = "--continue";
+		else if (cmd == 's')
+			this_operation = "--skip";
+		else {
+			assert(cmd == 'a');
+			this_operation = "--abort";
+		}
+
+		verify_opt_compatible(me, this_operation,
+				"--no-commit", opts->no_commit,
+				"--signoff", opts->signoff,
+				"--mainline", opts->mainline,
+				"--strategy", opts->strategy ? 1 : 0,
+				"--strategy-option", opts->xopts ? 1 : 0,
+				"-x", opts->record_origin,
+				"--ff", opts->allow_ff,
+				"--rerere-autoupdate", opts->allow_rerere_auto == RERERE_AUTOUPDATE,
+				"--no-rerere-autoupdate", opts->allow_rerere_auto == RERERE_NOAUTOUPDATE,
+				NULL);
+	}
+
+	if (opts->allow_ff)
+		verify_opt_compatible(me, "--ff",
+				"--signoff", opts->signoff,
+				"--no-commit", opts->no_commit,
+				"-x", opts->record_origin,
+				"--edit", opts->edit,
+				NULL);
+
+	if (cmd) {
+		opts->revs = NULL;
+	} else {
+		struct setup_revision_opt s_r_opt;
+		opts->revs = xmalloc(sizeof(*opts->revs));
+		repo_init_revisions(the_repository, opts->revs, NULL);
+		opts->revs->no_walk = REVISION_WALK_NO_WALK_UNSORTED;
+		if (argc < 2)
+			usage_with_options(usage_str, options);
+		if (!strcmp(argv[1], "-"))
+			argv[1] = "@{-1}";
+		memset(&s_r_opt, 0, sizeof(s_r_opt));
+		s_r_opt.assume_dashdash = 1;
+		argc = setup_revisions(argc, argv, opts->revs, &s_r_opt);
+	}
+
+	if (argc > 1)
+		usage_with_options(usage_str, options);
+
+	/* These option values will be free()d */
+	opts->gpg_sign = xstrdup_or_null(opts->gpg_sign);
+	opts->strategy = xstrdup_or_null(opts->strategy);
+
+	if (cmd == 'q') {
+		int ret = sequencer_remove_state(opts);
+		if (!ret)
+			remove_branch_state(the_repository, 0);
+		return ret;
+	}
+	if (cmd == 'c')
+		return sequencer_continue(the_repository, opts);
+	if (cmd == 'a')
+		return sequencer_rollback(the_repository, opts);
+	if (cmd == 's')
+		return sequencer_skip(the_repository, opts);
+	return sequencer_pick_revisions(the_repository, opts);
+}
+
+int cmd_revert(int argc, const char **argv, const char *prefix)
+{
+	struct replay_opts opts = REPLAY_OPTS_INIT;
+	int res;
+
+	if (isatty(0))
+		opts.edit = 1;
+	opts.action = REPLAY_REVERT;
+	sequencer_init_config(&opts);
+	res = run_sequencer(argc, argv, &opts);
+	if (res < 0)
+		die(_("revert failed"));
+	return res;
+}
+
+int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
+{
+	struct replay_opts opts = REPLAY_OPTS_INIT;
+	int res;
+
+	opts.action = REPLAY_PICK;
+	sequencer_init_config(&opts);
+	res = run_sequencer(argc, argv, &opts);
+	if (res < 0)
+		die(_("cherry-pick failed"));
+	return res;
+}