Quoth Mark Walters on May 27 at 11:30 pm:
> Austin Clements <amdragon@MIT.EDU> writes:
> 
> > This is a follow-up of sorts to id:"8761ycc19t.fsf@qmul.ac.uk", where
> > Mark suggested that the part handling commands could all use the
> > correponding mm-* functions.  I ran with the idea and wound up with
> > this series, which, in addition to standardizing on the mm-* functions
> > for everything and simplifying the implementation overall, decouples
> > the part commands from part buttons, which removes an entire layer
> > from the implementation and adds the ability to invoke part commands
> > with point anywhere in a part (something I often find myself wanting).
> 
> Overall I really like this series. In addition to the clean up etc it
> makes it easy to export the text/plain part (which doesn't have a part
> button). I have recollection of this being difficult if it is base64
> encoded.

Right.  That's one of the reasons I wanted a global part keymap (and
this series happened to be a convenient place to introduce that).
Also helpful is that the part bindings now appear in the show help,
which is good because I can never remember which key used the default
viewer and which prompted for a viewer.

> I have a few small comments
> 
> As mentioned on irc (just included here in case other people are
> testing) make-composed-keymap is emacs 24 only.

I've removed the button map entirely, so this is no longer a problem.

> This does change the default directory for saving: not serious but it's
> probably worth deciding do we want to use mailcap-download-directory or
> home or where emacs was started or?

I don't really care what the default directory is, as long as we're
consistent, which we currently aren't.  mm-default-directory seems
like a fine thing to be consistent with, since we use mm for
everything else.

> I don't know if we want to keep a special keymap for the button or just
> always use the . prefix; the advantage is that you don't have 's' on a
> button acting differently from 's' in the text (which has annoyed me
> several times) otoh it is the extra keystroke which may annoy people
> too. Let the bikeshedding begin! (obviously return for the default
> action would remain.

I'm all for removing the special button keymap.  The less hidden
functionality the better.

> Would it be worth having . return in the part body  as the default
> action ?

I played with this for a while and eventually decided it wasn't worth
the effort.  Maybe in a followup.

> Finally, with message indenting it's the start/end of the part are a
> little unclear. I think it's the [ of the part button at the start of
> the part to the character before the [ of the next part button. In
> particular on the line of a new part but before the button is still the
> old part. Since parts are whole lines it would be nice if the region
> were line based but I don't know if that is easy.

Fixed in v2.

> Best wishes
> 
> Mark