Re: RFC - "git editlog" feature for fixing up local commit messages

[Michael J Gruber <git@drmicha.warpmail.net>]

Avery Pennarun venit, vidit, dixit 29.03.2010 22:14:
> On Mon, Mar 29, 2010 at 9:31 AM, Eric Raymond <esr@thyrsus.com> wrote:
>> My editcomment script, as it exists, has a technical problem...the
>> editor needs to be something like emacsclient that actually invokes in
>> a different X window, otherwise whatever it writes to stdout will end
>> up stuffed in the comment along with the text I actually wanted to put
>> there.  The underlying problem is that git-filter-branch is sort of a
>> nuclear-powered chainsaw - gets the job done, but in a way that is
>> prone to messy side effects.  A more elegant implementation would
>> probably need to tie deeper into the plumbing.
> 
> It ought to be easy to work around this; simply extract the log
> message *before* filter-branch using something like
> 
>        git cat-file commit HEAD | tail -n +6 >msg.tmp
> 
> (I'm sure someone will correct me by providing a less revolting way to
> extract the commit message, but it's somehow not coming to me right
> now.)
> 
> Then launch $EDITOR to edit the message, then inside the
> filter-branch, just use that file instead of launching the editor.
> 
> Alternatively, in case you want the option of editing *multiple*
> commit messages at once, you could just redirect stdin/stdout to
> /dev/tty.
> 
> A further option would be to extend git-rebase--interactive.sh (yes,
> it's just a shell script) to take an option that makes a given commit
> (or commits) 'reword' by default instead of 'pick'.  And maybe another
> option to make git-rebase--interactive.sh not actually pop up an
> editor before it starts running.  Then your editcommit script could
> just be a thin wrapper around rebase with those options.

I think the OP's point was that filter-branch is better at keeping
merges in place; I'm not sure if this is true when rebase-i is used with
reword only.

> <insert obligatory wistful reference to git-sequencer> (I don't
> actually know anything about git-sequencer.)

Oh yeah:)

Michael