From: Johannes Schindelin <johannes.schindelin@xxxxxx>
The idea of `--exec` is to append an `exec` call after each `pick`.
Since the introduction of fixup!/squash! commits, this idea was extended
to apply to "pick, possibly followed by a fixup/squash chain", i.e. an
exec would not be inserted between a `pick` and any of its corresponding
`fixup` or `squash` lines.
The current implementation uses a dirty trick to achieve that: it
assumes that there are only pick/fixup/squash commands, and then
*inserts* the `exec` lines before any `pick` but the first, and appends
a final one.
With the todo lists generated by `git rebase --rebase-merges`, this
simple implementation shows its problems: it produces the exact wrong
thing when there are `label`, `reset` and `merge` commands.
Let's change the implementation to do exactly what we want: look for
`pick` lines, skip any fixup/squash chains, and then insert the `exec`
line. Lather, rinse, repeat.
While at it, also add `exec` lines after `merge` commands, because they
are similar in spirit to `pick` commands: they add new commits.
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
sequencer.c | 37 +++++++++++++++++++++++++++----------
t/t3430-rebase-merges.sh | 2 +-
2 files changed, 28 insertions(+), 11 deletions(-)
diff --git a/sequencer.c b/sequencer.c
index 31038472f..ed2e694ff 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -4244,10 +4244,9 @@ int sequencer_add_exec_commands(const char
*commands)
{
const char *todo_file = rebase_path_todo();
struct todo_list todo_list = TODO_LIST_INIT;
- struct todo_item *item;
struct strbuf *buf = &todo_list.buf;
size_t offset = 0, commands_len = strlen(commands);
- int i, first;
+ int i, insert;
if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
return error(_("could not read '%s'."), todo_file);
@@ -4257,19 +4256,37 @@ int sequencer_add_exec_commands(const char
*commands)
return error(_("unusable todo list: '%s'"), todo_file);
}
- first = 1;
- /* insert <commands> before every pick except the first one */
- for (item = todo_list.items, i = 0; i < todo_list.nr; i++, item++) {
- if (item->command == TODO_PICK && !first) {
- strbuf_insert(buf, item->offset_in_buf + offset,
- commands, commands_len);
+ /*
+ * Insert <commands> after every pick. Here, fixup/squash chains
+ * are considered part of the pick, so we insert the commands
*after*
+ * those chains if there are any.
+ */
+ insert = -1;
+ for (i = 0; i < todo_list.nr; i++) {
+ enum todo_command command = todo_list.items[i].command;
+
+ if (insert >= 0) {
+ /* skip fixup/squash chains */
+ if (command == TODO_COMMENT)
+ continue;
+ else if (is_fixup(command)) {
+ insert = i + 1;
+ continue;
+ }
+ strbuf_insert(buf,
+ todo_list.items[insert].offset_in_buf +
+ offset, commands, commands_len);
offset += commands_len;
+ insert = -1;
}
- first = 0;
+
+ if (command == TODO_PICK || command == TODO_MERGE)
+ insert = i + 1;
}
/* append final <commands> */
- strbuf_add(buf, commands, commands_len);
+ if (insert >= 0 || !offset)
+ strbuf_add(buf, commands, commands_len);
