sequencer: refactor check_todo_list() to work on a todo_list

This refactors check_todo_list() to work on a todo_list to avoid
redundant reads and writes to the disk.  The function is renamed
todo_list_check().  The parsing of the two todo lists is left to the
caller.

As rebase -p still need to check the todo list from the disk, a new
function is introduced, check_todo_list_from_file().  It reads the file
from the disk, parses it, pass the todo_list to todo_list_check(), and
writes it back to the disk.

As get_missing_commit_check_level() and the enum
missing_commit_check_level are no longer needed inside of sequencer.c,
they are moved to rebase-interactive.c, and made static again.

Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 23 insertions, 98 deletions

diff --git a/sequencer.c b/sequencer.c
index 4809b22ce4..99e12c751e 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -4660,112 +4660,37 @@ int transform_todo_file(struct repository *r, unsigned flags)
 	return 0;
 }
 
-enum missing_commit_check_level get_missing_commit_check_level(void)
-{
-	const char *value;
-
-	if (git_config_get_value("rebase.missingcommitscheck", &value) ||
-			!strcasecmp("ignore", value))
-		return MISSING_COMMIT_CHECK_IGNORE;
-	if (!strcasecmp("warn", value))
-		return MISSING_COMMIT_CHECK_WARN;
-	if (!strcasecmp("error", value))
-		return MISSING_COMMIT_CHECK_ERROR;
-	warning(_("unrecognized setting %s for option "
-		  "rebase.missingCommitsCheck. Ignoring."), value);
-	return MISSING_COMMIT_CHECK_IGNORE;
-}
+static const char edit_todo_list_advice[] =
+N_("You can fix this with 'git rebase --edit-todo' "
+"and then run 'git rebase --continue'.\n"
+"Or you can abort the rebase with 'git rebase"
+" --abort'.\n");
 
-define_commit_slab(commit_seen, unsigned char);
-/*
- * Check if the user dropped some commits by mistake
- * Behaviour determined by rebase.missingCommitsCheck.
- * Check if there is an unrecognized command or a
- * bad SHA-1 in a command.
- */
-int check_todo_list(struct repository *r)
+int check_todo_list_from_file(struct repository *r)
 {
-	enum missing_commit_check_level check_level = get_missing_commit_check_level();
-	struct strbuf todo_file = STRBUF_INIT;
-	struct todo_list todo_list = TODO_LIST_INIT;
-	struct strbuf missing = STRBUF_INIT;
-	int advise_to_edit_todo = 0, res = 0, i;
-	struct commit_seen commit_seen;
-
-	init_commit_seen(&commit_seen);
+	struct todo_list old_todo = TODO_LIST_INIT, new_todo = TODO_LIST_INIT;
+	int res = 0;
 
-	strbuf_addstr(&todo_file, rebase_path_todo());
-	if (strbuf_read_file_or_whine(&todo_list.buf, todo_file.buf) < 0) {
+	if (strbuf_read_file_or_whine(&new_todo.buf, rebase_path_todo()) < 0) {
 		res = -1;
-		goto leave_check;
-	}
-	advise_to_edit_todo = res =
-		todo_list_parse_insn_buffer(r, todo_list.buf.buf, &todo_list);
-
-	if (res || check_level == MISSING_COMMIT_CHECK_IGNORE)
-		goto leave_check;
-
-	/* Mark the commits in git-rebase-todo as seen */
-	for (i = 0; i < todo_list.nr; i++) {
-		struct commit *commit = todo_list.items[i].commit;
-		if (commit)
-			*commit_seen_at(&commit_seen, commit) = 1;
+		goto out;
 	}
 
-	todo_list_release(&todo_list);
-	strbuf_addstr(&todo_file, ".backup");
-	if (strbuf_read_file_or_whine(&todo_list.buf, todo_file.buf) < 0) {
+	if (strbuf_read_file_or_whine(&old_todo.buf, rebase_path_todo_backup()) < 0) {
 		res = -1;
-		goto leave_check;
-	}
-	strbuf_release(&todo_file);
-	res = !!todo_list_parse_insn_buffer(r, todo_list.buf.buf, &todo_list);
-
-	/* Find commits in git-rebase-todo.backup yet unseen */
-	for (i = todo_list.nr - 1; i >= 0; i--) {
-		struct todo_item *item = todo_list.items + i;
-		struct commit *commit = item->commit;
-		if (commit && !*commit_seen_at(&commit_seen, commit)) {
-			strbuf_addf(&missing, " - %s %.*s\n",
-				    short_commit_name(commit),
-				    item->arg_len,
-				    todo_item_get_arg(&todo_list, item));
-			*commit_seen_at(&commit_seen, commit) = 1;
-		}
+		goto out;
 	}
 
-	/* Warn about missing commits */
-	if (!missing.len)
-		goto leave_check;
-
-	if (check_level == MISSING_COMMIT_CHECK_ERROR)
-		advise_to_edit_todo = res = 1;
-
-	fprintf(stderr,
-		_("Warning: some commits may have been dropped accidentally.\n"
-		"Dropped commits (newer to older):\n"));
-
-	/* Make the list user-friendly and display */
-	fputs(missing.buf, stderr);
-	strbuf_release(&missing);
-
-	fprintf(stderr, _("To avoid this message, use \"drop\" to "
-		"explicitly remove a commit.\n\n"
-		"Use 'git config rebase.missingCommitsCheck' to change "
-		"the level of warnings.\n"
-		"The possible behaviours are: ignore, warn, error.\n\n"));
-
-leave_check:
-	clear_commit_seen(&commit_seen);
-	strbuf_release(&todo_file);
-	todo_list_release(&todo_list);
-
-	if (advise_to_edit_todo)
-		fprintf(stderr,
-			_("You can fix this with 'git rebase --edit-todo' "
-			  "and then run 'git rebase --continue'.\n"
-			  "Or you can abort the rebase with 'git rebase"
-			  " --abort'.\n"));
+	res = todo_list_parse_insn_buffer(r, old_todo.buf.buf, &old_todo);
+	if (!res)
+		res = todo_list_parse_insn_buffer(r, new_todo.buf.buf, &new_todo);
+	if (!res)
+		res = todo_list_check(&old_todo, &new_todo);
+	if (res)
+		fprintf(stderr, _(edit_todo_list_advice));
+out:
+	todo_list_release(&old_todo);
+	todo_list_release(&new_todo);
 
 	return res;
 }
@@ -4943,7 +4868,7 @@ int complete_action(struct repository *r, struct replay_opts *opts, unsigned fla
 
 	todo_list_release(&todo_list);
 
-	if (check_todo_list(r)) {
+	if (check_todo_list_from_file(r)) {
 		checkout_onto(opts, onto_name, onto, orig_head);
 		return -1;
 	}