Re: [PATCH 08/15] sequencer: change complete_action() to use the refactored functions

complete_action() used functions that read the todo-list file, made some
changes to it, and wrote it back to the disk.

The previous commits were dedicated to separate the part that deals with
the file from the actual logic of these functions.  Now that this is
done, we can call directly the "logic" functions to avoid useless file
access.

Signed-off-by: Alban Gruin <redacted>
---
  builtin/rebase--interactive.c | 13 +-----
  sequencer.c                   | 76 +++++++++++++++++------------------
  sequencer.h                   |  2 +-
  3 files changed, 38 insertions(+), 53 deletions(-)

diff --git a/builtin/rebase--interactive.c b/builtin/rebase--interactive.c
index eef1ff2e83..0700339f90 100644
--- a/builtin/rebase--interactive.c
+++ b/builtin/rebase--interactive.c

@@ -71,7 +71,6 @@ static int do_interactive_rebase(struct replay_opts *opts, unsigned flags,
  	const char *head_hash = NULL;
  	char *revisions = NULL, *shortrevisions = NULL;
  	struct argv_array make_script_args = ARGV_ARRAY_INIT;
-	FILE *todo_list_file;
  	struct todo_list todo_list = TODO_LIST_INIT;
  
  	if (prepare_branch_to_be_rebased(opts, switch_to))

@@ -94,14 +93,6 @@ static int do_interactive_rebase(struct replay_opts *opts, unsigned flags,
  	if (!upstream && squash_onto)
  		write_file(path_squash_onto(), "%s\n", squash_onto);
  
-	todo_list_file = fopen(rebase_path_todo(), "w");
-	if (!todo_list_file) {
-		free(revisions);
-		free(shortrevisions);
-
-		return error_errno(_("could not open %s"), rebase_path_todo());
-	}
-
  	argv_array_pushl(&make_script_args, "", revisions, NULL);
  	if (restrict_revision)
  		argv_array_push(&make_script_args, restrict_revision);

@@ -109,15 +100,13 @@ static int do_interactive_rebase(struct replay_opts *opts, unsigned flags,
  	ret = sequencer_make_script(&todo_list.buf,
  				    make_script_args.argc, make_script_args.argv,
  				    flags);

-	fputs(todo_list.buf.buf, todo_list_file);
-	fclose(todo_list_file);
  
  	if (ret)
  		error(_("could not generate todo list"));
  	else {
  		discard_cache() >   		ret = complete_action(opts, flags, shortrevisions, onto_name, onto,
-				      head_hash, cmd, autosquash);
+				      head_hash, cmd, autosquash, &todo_list);
  	}
  
  	free(revisions);

diff --git a/sequencer.c b/sequencer.c
index dfb8d1c974..b37935e5ab 100644
--- a/sequencer.c
+++ b/sequencer.c

@@ -4624,93 +4624,89 @@ static int skip_unnecessary_picks(struct object_id *output_oid)
  	return 0;
  }
  
+static int todo_list_rearrange_squash(struct todo_list *todo_list);
+
  int complete_action(struct replay_opts *opts, unsigned flags,
  		    const char *shortrevisions, const char *onto_name,
  		    const char *onto, const char *orig_head, const char *cmd,
-		    unsigned autosquash)
+		    unsigned autosquash, struct todo_list *todo_list)
  {
  	const char *shortonto, *todo_file = rebase_path_todo();
-	struct todo_list todo_list = TODO_LIST_INIT;
-	struct strbuf *buf = &(todo_list.buf);
+	struct todo_list new_todo = TODO_LIST_INIT;
+	struct strbuf *buf = &todo_list->buf;
  	struct object_id oid;
-	struct stat st;
+	int command_count;
  
  	get_oid(onto, &oid);
  	shortonto = find_unique_abbrev(&oid, DEFAULT_ABBREV);
  
-	if (!lstat(todo_file, &st) && st.st_size == 0 &&
-	    write_message("noop\n", 5, todo_file, 0))
-		return -1;
+	if (buf->len == 0)
+		strbuf_add(buf, "noop\n", 5);
+
+	if (todo_list_parse_insn_buffer(buf->buf, todo_list))
+		BUG("unusable todo list");
  
-	if (autosquash && rearrange_squash_in_todo_file())
+	if (autosquash && todo_list_rearrange_squash(todo_list))
  		return -1;
  
  	if (cmd && *cmd)
-		sequencer_add_exec_commands(cmd);
+		todo_list_add_exec_commands(todo_list, cmd);
  
-	if (strbuf_read_file(buf, todo_file, 0) < 0)
-		return error_errno(_("could not read '%s'."), todo_file);
-
-	if (todo_list_parse_insn_buffer(buf->buf, &todo_list)) {
-		todo_list_release(&todo_list);
-		return error(_("unusable todo list: '%s'"), todo_file);
-	}
-
-	if (count_commands(&todo_list) == 0) {
+	command_count = count_commands(todo_list);
+	if (command_count == 0) {
  		apply_autostash(opts);
  		sequencer_remove_state(opts);
-		todo_list_release(&todo_list);
  
  		return error(_("nothing to do"));
  	}
  
+	todo_list_transform(todo_list, flags | TODO_LIST_SHORTEN_IDS);
+
  	strbuf_addch(buf, '\n');
  	strbuf_commented_addf(buf, Q_("Rebase %s onto %s (%d command)",
  				      "Rebase %s onto %s (%d commands)",
-				      count_commands(&todo_list)),
-			      shortrevisions, shortonto, count_commands(&todo_list));
+				      command_count),
+			      shortrevisions, shortonto, command_count);
  	append_todo_help(0, flags & TODO_LIST_KEEP_EMPTY, buf);
  
-	if (write_message(buf->buf, buf->len, todo_file, 0)) {
-		todo_list_release(&todo_list);
-		return -1;
-	}
+	if (write_message(buf->buf, buf->len, todo_file, 0))
+		return error_errno(_("could not write '%s'"), todo_file);
  
  	if (copy_file(rebase_path_todo_backup(), todo_file, 0666))
  		return error(_("could not copy '%s' to '%s'."), todo_file,
  			     rebase_path_todo_backup());
  
-	if (transform_todo_file(flags | TODO_LIST_SHORTEN_IDS))
-		return error(_("could not transform the todo list"));
-
-	strbuf_reset(buf);
-
-	if (launch_sequence_editor(todo_file, buf, NULL)) {
+	if (launch_sequence_editor(todo_file, &new_todo.buf, NULL)) {
  		apply_autostash(opts);
  		sequencer_remove_state(opts);
-		todo_list_release(&todo_list);
  
  		return -1;
  	}
  
-	strbuf_stripspace(buf, 1);
-	if (buf->len == 0) {
+	strbuf_stripspace(&new_todo.buf, 1);
+	if (new_todo.buf.len == 0) {
  		apply_autostash(opts);
  		sequencer_remove_state(opts);
-		todo_list_release(&todo_list);
+		todo_list_release(&new_todo);
  
  		return error(_("nothing to do"));
  	}
  
-	todo_list_release(&todo_list);
-
-	if (check_todo_list_from_file()) {
+	if (todo_list_check(todo_list, &new_todo)) {
  		checkout_onto(opts, onto_name, onto, orig_head);
+		todo_list_release(&new_todo);
+
  		return -1;
  	}
  
-	if (transform_todo_file(flags & ~(TODO_LIST_SHORTEN_IDS)))
-		return error(_("could not transform the todo list"));
+	todo_list_transform(&new_todo, flags & ~(TODO_LIST_SHORTEN_IDS));
+
+	if (rewrite_file(todo_file, new_todo.buf.buf, new_todo.buf.len) < 0) {
+		todo_list_release(&new_todo);
+		return error_errno(_("could not write '%s'"), todo_file);
+	}

+
+	todo_list_release(&new_todo);
  
  	if (opts->allow_ff && skip_unnecessary_picks(&oid))
  		return error(_("could not skip unnecessary pick commands"));

diff --git a/sequencer.h b/sequencer.h
index 21d9ba09ab..5bd3b79282 100644
--- a/sequencer.h
+++ b/sequencer.h

@@ -141,7 +141,7 @@ int check_todo_list_from_file(void);
  int complete_action(struct replay_opts *opts, unsigned flags,
  		    const char *shortrevisions, const char *onto_name,
  		    const char *onto, const char *orig_head, const char *cmd,
-		    unsigned autosquash);
+		    unsigned autosquash, struct todo_list *todo_list);
  int rearrange_squash_in_todo_file(void);
  
  extern const char sign_off_header[];