[PATCH v3 11/27] rebase -i: implement reword in terms of do_pick

The to-do list command `reword` replays a commit like `pick` but lets
the user also edit the commit's log message. If one thinks of `pick`
entries as scheduled `cherry-pick` command lines, then `reword`
becomes an alias for the command line `cherry-pick --edit`. The
porcelain `rebase--interactive` defines a function `do_pick` for
processing the `pick` entries on to-do lists. Reimplement `reword` in
terms of `do_pick --edit`.

If the user picks a commit using the to-do list line

    reword fa1afe1 Some change

execute the command `do_pick --edit fa1afe1 "Some change"` which
carries out exactly the same steps as the case arm for `reword` in
`do_next` so far.

Signed-off-by: Fabian Ruch <redacted>
---
 git-rebase--interactive.sh | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 8a89ced..2d768b3 100644
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh

@@ -546,11 +546,7 @@ do_next () {
 		comment_for_reflog reword
 
 		mark_action_done
-		do_pick $sha1 "$rest"
-		output git commit --allow-empty --amend --no-post-rewrite --no-pre-commit ${gpg_sign_opt:+"$gpg_sign_opt"} || {
-			warn "Could not amend commit after successfully picking $sha1... $rest"
-			exit_with_patch $sha1 1
-		}
+		do_pick --edit $sha1 "$rest"
 		record_in_rewritten $sha1
 		;;
 	edit|e)

-- 
2.0.1