Merge branch 'ag/sequencer-todo-updates'

Reduce unnecessary reading of state variables back from the disk
during sequencer operation.

* ag/sequencer-todo-updates:
  sequencer: directly call pick_commits() from complete_action()
  rebase: fill `squash_onto' in get_replay_opts()
  sequencer: move the code writing total_nr on the disk to a new function
  sequencer: update `done_nr' when skipping commands in a todo list
  sequencer: update `total_nr' when adding an item to a todo list

Author: gitster

builtin/rebase.c

@@ -130,6 +130,12 @@ static struct replay_opts get_replay_opts(const struct rebase_options *opts)
 		parse_strategy_opts(&replay, strategy_buf.buf);
 
 	strbuf_release(&strategy_buf);
+
+	if (opts->squash_onto) {
+		oidcpy(&replay.squash_onto, opts->squash_onto);
+		replay.have_squash_onto = 1;
+	}
+
 	return replay;
 }
 

sequencer.c

@@ -2130,6 +2130,7 @@ void todo_list_release(struct todo_list *todo_list)
 static struct todo_item *append_new_todo(struct todo_list *todo_list)
 {
 	ALLOC_GROW(todo_list->items, todo_list->nr + 1, todo_list->alloc);
+	todo_list->total_nr++;
 	return todo_list->items + todo_list->nr++;
 }
 
@@ -2401,6 +2402,16 @@ void sequencer_post_commit_cleanup(struct repository *r, int verbose)
 	sequencer_remove_state(&opts);
 }
 
+static void todo_list_write_total_nr(struct todo_list *todo_list)
+{
+	FILE *f = fopen_or_warn(rebase_path_msgtotal(), "w");
+
+	if (f) {
+		fprintf(f, "%d\n", todo_list->total_nr);
+		fclose(f);
+	}
+}
+
 static int read_populate_todo(struct repository *r,
 			      struct todo_list *todo_list,
 			      struct replay_opts *opts)
@@ -2446,7 +2457,6 @@ static int read_populate_todo(struct repository *r,
 
 	if (is_rebase_i(opts)) {
 		struct todo_list done = TODO_LIST_INIT;
-		FILE *f = fopen_or_warn(rebase_path_msgtotal(), "w");
 
 		if (strbuf_read_file(&done.buf, rebase_path_done(), 0) > 0 &&
 		    !todo_list_parse_insn_buffer(r, done.buf.buf, &done))
@@ -2458,10 +2468,7 @@ static int read_populate_todo(struct repository *r,
 			+ count_commands(todo_list);
 		todo_list_release(&done);
 
-		if (f) {
-			fprintf(f, "%d\n", todo_list->total_nr);
-			fclose(f);
-		}
+		todo_list_write_total_nr(todo_list);
 	}
 
 	return 0;
@@ -5176,6 +5183,7 @@ static int skip_unnecessary_picks(struct repository *r,
 		MOVE_ARRAY(todo_list->items, todo_list->items + i, todo_list->nr - i);
 		todo_list->nr -= i;
 		todo_list->current = 0;
+		todo_list->done_nr += i;
 
 		if (is_fixup(peek_command(todo_list, 0)))
 			record_in_rewritten(base_oid, peek_command(todo_list, 0));
@@ -5255,15 +5263,21 @@ int complete_action(struct repository *r, struct replay_opts *opts, unsigned fla
 		return error_errno(_("could not write '%s'"), todo_file);
 	}
 
-	todo_list_release(&new_todo);
+	res = -1;
 
 	if (checkout_onto(r, opts, onto_name, &oid, orig_head))
-		return -1;
+		goto cleanup;
 
 	if (require_clean_work_tree(r, "rebase", "", 1, 1))
-		return -1;
+		goto cleanup;
 
-	return sequencer_continue(r, opts);
+	todo_list_write_total_nr(&new_todo);
+	res = pick_commits(r, &new_todo, opts);
+
+cleanup:
+	todo_list_release(&new_todo);
+
+	return res;
 }
 
 struct subject2item_entry {