sequencer (rebase -i): allow fast-forwarding for edit/reword

The sequencer already knew how to fast-forward instead of
cherry-picking, if possible.

We want to continue to do this, of course, but in case of the 'reword'
command, we will need to call `git commit` after fast-forwarding.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/sequencer.c b/sequencer.c
index 50e998acc4c5749fbd37b1dfbcf73dc495a7f233..23161f593e2ce90486a939dd8612843a08c74003 100644 (file)
--- a/sequencer.c
+++ b/sequencer.c
@@ -860,7 +860,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
        const char *base_label, *next_label;
        struct commit_message msg = { NULL, NULL, NULL, NULL };
        struct strbuf msgbuf = STRBUF_INIT;
-       int res, unborn = 0, amend = 0, allow;
+       int res, unborn = 0, amend = 0, allow = 0;
 
        if (opts->no_commit) {
                /*
@@ -905,11 +905,23 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
        else
                parent = commit->parents->item;
 
+       if (get_message(commit, &msg) != 0)
+               return error(_("cannot get commit message for %s"),
+                       oid_to_hex(&commit->object.oid));
+
        if (opts->allow_ff && !is_fixup(command) &&
            ((parent && !hashcmp(parent->object.oid.hash, head)) ||
-            (!parent && unborn)))
-               return fast_forward_to(commit->object.oid.hash, head, unborn, opts);
-
+            (!parent && unborn))) {
+               if (is_rebase_i(opts))
+                       write_author_script(msg.message);
+               res = fast_forward_to(commit->object.oid.hash, head, unborn,
+                       opts);
+               if (res || command != TODO_REWORD)
+                       goto leave;
+               edit = amend = 1;
+               msg_file = NULL;
+               goto fast_forward_edit;
+       }
        if (parent && parse_commit(parent) < 0)
                /* TRANSLATORS: The first %s will be a "todo" command like
                   "revert" or "pick", the second %s a SHA1. */
@@ -917,10 +929,6 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
                        command_to_string(command),
                        oid_to_hex(&parent->object.oid));
 
-       if (get_message(commit, &msg) != 0)
-               return error(_("cannot get commit message for %s"),
-                       oid_to_hex(&commit->object.oid));
-
        /*
         * "commit" is an existing commit.  We would want to apply
         * the difference it introduces since its first parent "prev"
@@ -1044,6 +1052,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
                goto leave;
        }
        if (!opts->no_commit)
+fast_forward_edit:
                res = run_git_commit(msg_file, opts, allow, edit, amend,
                                     cleanup_commit_message);