undef/git-commit-vandalism
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

rebase --exec: make it work with --rebase-merges

Browse Source 
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.

Note: we take pains to insert *before* comment lines whenever possible,
as empty commits are represented by commented-out pick lines (and we
want to insert a preceding pick's exec line *before* such a line, not
afterward).

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@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2018-08-09 02:41:11 -07:00 committed by Junio C Hamano
parent f0880f77ab
commit 1ace63bc39
2 changed files with 32 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
sequencer.c
View File

@ -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 +4256,40 @@ 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);
/* insert or append final <commands> */
if (insert >= 0 && insert < todo_list.nr)
strbuf_insert(buf, todo_list.items[insert].offset_in_buf +
offset, commands, commands_len);
else if (insert >= 0 || !offset)
strbuf_add(buf, commands, commands_len);
i = write_message(buf->buf, buf->len, todo_file, 0);
todo_list_release(&todo_list);

2
t/t3430-rebase-merges.sh
View File

@ -363,7 +363,7 @@ test_expect_success 'octopus merges' '
EOF
'
test_expect_failure 'with --autosquash and --exec' '
test_expect_success 'with --autosquash and --exec' '
git checkout -b with-exec H &&
echo Booh >B.t &&
test_tick &&