[PATCH v6 12/16] rebase-interactive: use todo_list_write_to_file() in edit_todo_list()

[Alban Gruin]

Just like complete_action(), edit_todo_list() used a
function (transform_todo_file()) that read the todo list from the disk
and wrote it back, resulting in useless disk accesses.

This changes edit_todo_list() to call directly todo_list_write_to_file()
instead.

Signed-off-by: Alban Gruin <alban.gr...@gmail.com>
---
 rebase-interactive.c | 38 ++++++++++++++++----------------------
 sequencer.c          |  4 ++--
 sequencer.h          |  3 ---
 3 files changed, 18 insertions(+), 27 deletions(-)

diff --git a/rebase-interactive.c b/rebase-interactive.c
index dfa6dd530f..d396ecc599 100644
--- a/rebase-interactive.c
+++ b/rebase-interactive.c
@@ -79,39 +79,33 @@ void append_todo_help(unsigned edit_todo, unsigned 
keep_empty,
 
 int edit_todo_list(struct repository *r, unsigned flags)
 {
-       struct strbuf buf = STRBUF_INIT;
        const char *todo_file = rebase_path_todo();
+       struct todo_list todo_list = TODO_LIST_INIT;
+       int res = 0;
 
-       if (strbuf_read_file(&buf, todo_file, 0) < 0)
+       if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
                return error_errno(_("could not read '%s'."), todo_file);
 
-       strbuf_stripspace(&buf, 1);
-       if (write_message(buf.buf, buf.len, todo_file, 0)) {
-               strbuf_release(&buf);
+       strbuf_stripspace(&todo_list.buf, 1);
+       todo_list_parse_insn_buffer(r, todo_list.buf.buf, &todo_list);
+       if (todo_list_write_to_file(r, &todo_list, todo_file, NULL, NULL, -1,
+                                   flags | TODO_LIST_SHORTEN_IDS | 
TODO_LIST_APPEND_TODO_HELP)) {
+               todo_list_release(&todo_list);
                return -1;
        }
 
-       strbuf_release(&buf);
-
-       transform_todo_file(r, flags | TODO_LIST_SHORTEN_IDS);
-
-       if (strbuf_read_file(&buf, todo_file, 0) < 0)
-               return error_errno(_("could not read '%s'."), todo_file);
-
-       append_todo_help(1, 0, &buf);
-       if (write_message(buf.buf, buf.len, todo_file, 0)) {
-               strbuf_release(&buf);
+       strbuf_reset(&todo_list.buf);
+       if (launch_sequence_editor(todo_file, &todo_list.buf, NULL)) {
+               todo_list_release(&todo_list);
                return -1;
        }
 
-       strbuf_release(&buf);
+       if (!todo_list_parse_insn_buffer(r, todo_list.buf.buf, &todo_list))
+               res = todo_list_write_to_file(r, &todo_list, todo_file, NULL, 
NULL, -1,
+                                             flags & ~(TODO_LIST_SHORTEN_IDS));
 
-       if (launch_sequence_editor(todo_file, NULL, NULL))
-               return -1;
-
-       transform_todo_file(r, flags & ~(TODO_LIST_SHORTEN_IDS));
-
-       return 0;
+       todo_list_release(&todo_list);
+       return res;
 }
 
 define_commit_slab(commit_seen, unsigned char);
diff --git a/sequencer.c b/sequencer.c
index a817afffa9..d8d045067c 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -383,8 +383,8 @@ static void print_advice(struct repository *r, int 
show_hint,
        }
 }
 
-int write_message(const void *buf, size_t len, const char *filename,
-                 int append_eol)
+static int write_message(const void *buf, size_t len, const char *filename,
+                        int append_eol)
 {
        struct lock_file msg_file = LOCK_INIT;
 
diff --git a/sequencer.h b/sequencer.h
index 0c30e43f0a..c5bee8124c 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -64,9 +64,6 @@ struct replay_opts {
 };
 #define REPLAY_OPTS_INIT { .action = -1, .current_fixups = STRBUF_INIT }
 
-int write_message(const void *buf, size_t len, const char *filename,
-                 int append_eol);
-
 /*
  * Note that ordering matters in this enum. Not only must it match the mapping
  * of todo_command_info (in sequencer.c), it is also divided into several
-- 
2.20.1