Re: [PATCH 2/8] sequencer: introduce the `merge` command

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Hi Jake & Phillip,

On Mon, 29 Jan 2018, Johannes Schindelin wrote:

> On Sat, 20 Jan 2018, Jacob Keller wrote:
> 
> > On Fri, Jan 19, 2018 at 6:45 AM, Phillip Wood <phillip.wood@xxxxxxxxxxxx> wrote:
> > > On 18/01/18 15:35, Johannes Schindelin wrote:
> > >>
> > >> This patch adds the `merge` command, with the following syntax:
> > >>
> > >>       merge <commit> <rev> <oneline>
> > >
> > > I'm concerned that this will be confusing for users. All of the other
> > > rebase commands replay the changes in the commit hash immediately
> > > following the command name. This command instead uses the first
> > > commit to specify the message which is different to both 'git merge'
> > > and the existing rebase commands. I wonder if it would be clearer to
> > > have 'merge -C <commit> <rev> ...' instead so it's clear which
> > > argument specifies the message and which the remote head to merge.
> > > It would also allow for 'merge -c <commit> <rev> ...' in the future
> > > for rewording an existing merge message and also avoid the slightly
> > > odd 'merge - <rev> ...'. Where it's creating new merges I'm not sure
> > > it's a good idea to encourage people to only have oneline commit
> > > messages by making it harder to edit them, perhaps it could take
> > > another argument to mean open the editor or not, though as Jake said
> > > I guess it's not that common.
> > 
> > I actually like the idea of re-using commit message options like -C,
> > -c,  and -m, so we could do:
> > 
> > merge -C <commit> ... to take message from commit
> 
> That is exactly how the Git garden shears do it.
> 
> I found it not very readable. That is why I wanted to get away from it in
> --recreate-merges.

I made up my mind. Even if it is not very readable, it is still better
than the `merge A B` where the order of A and B magically determines their
respective roles.

> > merge -c <commit> ...  to take the message from commit and open editor to edit
> > merge -m "<message>" ... to take the message from the quoted test
> > merge ... to merge and open commit editor with default message

I will probably implement -c, but not -m, and will handle the absence of
the -C and -c options to construct a default merge message which can then
be edited.

The -m option just opens such a can of worms with dequoting, that's why I
do not want to do that.

BTW I am still trying to figure out how to present the oneline of the
commit to merge (which is sometimes really helpful because the label might
be less than meaningful) while *still* allowing for octopus merges.

So far, what I have is this:

	merge <original> <to-merge> <oneline>

and for octopus:

	merge <original> "<to-merge> <to-merge2>..." <oneline>...

I think with the -C syntax, it would become something like

	merge -C <original> <to-merge> # <oneline>

and

	merge -C <original> <to-merge> <to-merge2>...
	# Merging: <oneline>
	# Merging: <oneline2>
	# ...

The only qualm I have about this is that `#` really *is* a valid ref name.
(Seriously, it is...). So that would mean that I'd have to disallow `#`
as a label specificially.

Thoughts?

Ciao,
Dscho



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