rebase -i: use struct commit when parsing options

This is in preparation for using `struct rebase_options` when parsing
options in cmd_rebase__interactive(). Using a string for onto,
restrict_revision and upstream, was a hangover from the scripted version
of rebase. The functions that use these variables are updated to take a
`struct commit`.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/rebase.c

@@ -147,27 +147,28 @@ static int edit_todo_file(unsigned flags)
 	return res;
 }
 
-static int get_revision_ranges(const char *upstream, const char *onto,
+static int get_revision_ranges(struct commit *upstream, struct commit *onto,
 			       const char **head_hash,
 			       char **revisions, char **shortrevisions)
 {
-	const char *base_rev = upstream ? upstream : onto, *shorthead;
+	struct commit *base_rev = upstream ? upstream : onto;
+	const char *shorthead;
 	struct object_id orig_head;
 
 	if (get_oid("HEAD", &orig_head))
 		return error(_("no HEAD?"));
 
 	*head_hash = find_unique_abbrev(&orig_head, GIT_MAX_HEXSZ);
-	*revisions = xstrfmt("%s...%s", base_rev, *head_hash);
+	*revisions = xstrfmt("%s...%s", oid_to_hex(&base_rev->object.oid),
+						   *head_hash);
 
 	shorthead = find_unique_abbrev(&orig_head, DEFAULT_ABBREV);
 
 	if (upstream) {
 		const char *shortrev;
-		struct object_id rev_oid;
 
-		get_oid(base_rev, &rev_oid);
+		shortrev = find_unique_abbrev(&base_rev->object.oid,
-		shortrev = find_unique_abbrev(&rev_oid, DEFAULT_ABBREV);
+					      DEFAULT_ABBREV);
 
 		*shortrevisions = xstrfmt("%s..%s", shortrev, shorthead);
 	} else
@@ -177,7 +178,7 @@ static int get_revision_ranges(const char *upstream, const char *onto,
 }
 
 static int init_basic_state(struct replay_opts *opts, const char *head_name,
-			    const char *onto, const char *orig_head)
+			    struct commit *onto, const char *orig_head)
 {
 	FILE *interactive;
 
@@ -195,10 +196,10 @@ static int init_basic_state(struct replay_opts *opts, const char *head_name,
 }
 
 static int do_interactive_rebase(struct replay_opts *opts, unsigned flags,
-				 const char *switch_to, const char *upstream,
+				 const char *switch_to, struct commit *upstream,
-				 const char *onto, const char *onto_name,
+				 struct commit *onto, const char *onto_name,
 				 const char *squash_onto, const char *head_name,
-				 const char *restrict_revision, char *raw_strategies,
+				 struct commit *restrict_revision, char *raw_strategies,
 				 struct string_list *commands, unsigned autosquash)
 {
 	int ret;
@@ -229,7 +230,8 @@ static int do_interactive_rebase(struct replay_opts *opts, unsigned flags,
 
 	argv_array_pushl(&make_script_args, "", revisions, NULL);
 	if (restrict_revision)
-		argv_array_push(&make_script_args, restrict_revision);
+		argv_array_push(&make_script_args,
+				oid_to_hex(&restrict_revision->object.oid));
 
 	ret = sequencer_make_script(the_repository, &todo_list.buf,
 				    make_script_args.argc, make_script_args.argv,
@@ -265,9 +267,10 @@ int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
 	struct replay_opts opts = REPLAY_OPTS_INIT;
 	unsigned flags = 0, keep_empty = 0, rebase_merges = 0, autosquash = 0;
 	int abbreviate_commands = 0, rebase_cousins = -1, ret = 0;
-	const char *onto = NULL, *onto_name = NULL, *restrict_revision = NULL,
+	const char *onto_name = NULL,
-		*squash_onto = NULL, *upstream = NULL, *head_name = NULL,
+		*squash_onto = NULL, *head_name = NULL,
 		*switch_to = NULL, *cmd = NULL;
+	struct commit *onto = NULL, *upstream = NULL, *restrict_revision = NULL;
 	struct string_list commands = STRING_LIST_INIT_DUP;
 	char *raw_strategies = NULL;
 	enum {
@@ -303,13 +306,16 @@ int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
 			N_("rearrange fixup/squash lines"), REARRANGE_SQUASH),
 		OPT_CMDMODE(0, "add-exec-commands", &command,
 			N_("insert exec commands in todo list"), ADD_EXEC),
-		OPT_STRING(0, "onto", &onto, N_("onto"), N_("onto")),
+		{ OPTION_CALLBACK, 0, "onto", &onto, N_("onto"), N_("onto"),
-		OPT_STRING(0, "restrict-revision", &restrict_revision,
+		  PARSE_OPT_NONEG, parse_opt_commit, 0 },
-			   N_("restrict-revision"), N_("restrict revision")),
+		{ OPTION_CALLBACK, 0, "restrict-revision", &restrict_revision,
+		  N_("restrict-revision"), N_("restrict revision"),
+		  PARSE_OPT_NONEG, parse_opt_commit, 0 },
 		OPT_STRING(0, "squash-onto", &squash_onto, N_("squash-onto"),
 			   N_("squash onto")),
-		OPT_STRING(0, "upstream", &upstream, N_("upstream"),
+		{ OPTION_CALLBACK, 0, "upstream", &upstream, N_("upstream"),
-			   N_("the upstream commit")),
+		  N_("the upstream commit"), PARSE_OPT_NONEG, parse_opt_commit,
+		  0 },
 		OPT_STRING(0, "head-name", &head_name, N_("head-name"), N_("head name")),
 		{ OPTION_STRING, 'S', "gpg-sign", &opts.gpg_sign, N_("key-id"),
 			N_("GPG-sign commits"),

parse-options-cb.c

@@ -96,6 +96,23 @@ int parse_opt_commits(const struct option *opt, const char *arg, int unset)
 	return 0;
 }
 
+int parse_opt_commit(const struct option *opt, const char *arg, int unset)
+{
+	struct object_id oid;
+	struct commit *commit;
+	struct commit **target = opt->value;
+
+	if (!arg)
+		return -1;
+	if (get_oid(arg, &oid))
+		return error("malformed object name %s", arg);
+	commit = lookup_commit_reference(the_repository, &oid);
+	if (!commit)
+		return error("no such commit %s", arg);
+	*target = commit;
+	return 0;
+}
+
 int parse_opt_object_name(const struct option *opt, const char *arg, int unset)
 {
 	struct object_id oid;

parse-options.h

@@ -266,6 +266,7 @@ int parse_opt_color_flag_cb(const struct option *, const char *, int);
 int parse_opt_verbosity_cb(const struct option *, const char *, int);
 int parse_opt_object_name(const struct option *, const char *, int);
 int parse_opt_commits(const struct option *, const char *, int);
+int parse_opt_commit(const struct option *, const char *, int);
 int parse_opt_tertiary(const struct option *, const char *, int);
 int parse_opt_string_list(const struct option *, const char *, int);
 int parse_opt_noop_cb(const struct option *, const char *, int);

sequencer.c

@@ -2418,14 +2418,15 @@ static void write_strategy_opts(struct replay_opts *opts)
 }
 
 int write_basic_state(struct replay_opts *opts, const char *head_name,
-		      const char *onto, const char *orig_head)
+		      struct commit *onto, const char *orig_head)
 {
 	const char *quiet = getenv("GIT_QUIET");
 
 	if (head_name)
 		write_file(rebase_path_head_name(), "%s\n", head_name);
 	if (onto)
-		write_file(rebase_path_onto(), "%s\n", onto);
+		write_file(rebase_path_onto(), "%s\n",
+			   oid_to_hex(&onto->object.oid));
 	if (orig_head)
 		write_file(rebase_path_orig_head(), "%s\n", orig_head);
 
@@ -3456,7 +3457,7 @@ int prepare_branch_to_be_rebased(struct repository *r, struct replay_opts *opts,
 }
 
 static int checkout_onto(struct repository *r, struct replay_opts *opts,
-			 const char *onto_name, const char *onto,
+			 const char *onto_name, const struct object_id *onto,
 			 const char *orig_head)
 {
 	struct object_id oid;
@@ -3465,7 +3466,7 @@ static int checkout_onto(struct repository *r, struct replay_opts *opts,
 	if (get_oid(orig_head, &oid))
 		return error(_("%s: not a valid OID"), orig_head);
 
-	if (run_git_checkout(r, opts, onto, action)) {
+	if (run_git_checkout(r, opts, oid_to_hex(onto), action)) {
 		apply_autostash(opts);
 		sequencer_remove_state(opts);
 		return error(_("could not detach HEAD"));
@@ -4741,16 +4742,16 @@ static int skip_unnecessary_picks(struct repository *r,
 
 int complete_action(struct repository *r, struct replay_opts *opts, unsigned flags,
 		    const char *shortrevisions, const char *onto_name,
-		    const char *onto, const char *orig_head, struct string_list *commands,
+		    struct commit *onto, const char *orig_head,
-		    unsigned autosquash, struct todo_list *todo_list)
+		    struct string_list *commands, unsigned autosquash,
+		    struct todo_list *todo_list)
 {
 	const char *shortonto, *todo_file = rebase_path_todo();
 	struct todo_list new_todo = TODO_LIST_INIT;
 	struct strbuf *buf = &todo_list->buf;
-	struct object_id oid;
+	struct object_id oid = onto->object.oid;
 	int res;
 
-	get_oid(onto, &oid);
 	shortonto = find_unique_abbrev(&oid, DEFAULT_ABBREV);
 
 	if (buf->len == 0) {
@@ -4793,7 +4794,7 @@ int complete_action(struct repository *r, struct replay_opts *opts, unsigned fla
 	if (todo_list_parse_insn_buffer(r, new_todo.buf.buf, &new_todo) ||
 	    todo_list_check(todo_list, &new_todo)) {
 		fprintf(stderr, _(edit_todo_list_advice));
-		checkout_onto(r, opts, onto_name, onto, orig_head);
+		checkout_onto(r, opts, onto_name, &onto->object.oid, orig_head);
 		todo_list_release(&new_todo);
 
 		return -1;
@@ -4812,7 +4813,7 @@ int complete_action(struct repository *r, struct replay_opts *opts, unsigned fla
 
 	todo_list_release(&new_todo);
 
-	if (checkout_onto(r, opts, onto_name, oid_to_hex(&oid), orig_head))
+	if (checkout_onto(r, opts, onto_name, &oid, orig_head))
 		return -1;
 
 	if (require_clean_work_tree(r, "rebase", "", 1, 1))

sequencer.h

@@ -150,7 +150,7 @@ void todo_list_add_exec_commands(struct todo_list *todo_list,
 int check_todo_list_from_file(struct repository *r);
 int complete_action(struct repository *r, struct replay_opts *opts, unsigned flags,
 		    const char *shortrevisions, const char *onto_name,
-		    const char *onto, const char *orig_head, struct string_list *commands,
+		    struct commit *onto, const char *orig_head, struct string_list *commands,
 		    unsigned autosquash, struct todo_list *todo_list);
 int todo_list_rearrange_squash(struct todo_list *todo_list);
 
@@ -191,4 +191,4 @@ int read_author_script(const char *path, char **name, char **email, char **date,
 
 void parse_strategy_opts(struct replay_opts *opts, char *raw_opts);
 int write_basic_state(struct replay_opts *opts, const char *head_name,
-		      const char *onto, const char *orig_head);
+		      struct commit *onto, const char *orig_head);