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bug#19829: 25.0.50; Design of commands operating on rectangular regions
From: |
Stefan Monnier |
Subject: |
bug#19829: 25.0.50; Design of commands operating on rectangular regions |
Date: |
Tue, 07 Jul 2015 08:20:28 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
>> IOW, either your REGION arg uses a standard format (e.g. a list of
>> (START . END) boundaries), or it should be just a constant saying "use
>> things like region-extract-function ".
> Or better to check the value returned by region-extract-function
> in `interactive' with:
> (defun region-nonstandard ()
> (> (length (funcall region-extract-function 'positions)) 1))
> like the patch below does.
The idea of a constant saying "use the region" is also to distinguish it
from the case where the function is called non-interactively with
boundaries which aren't necessarily related to the current region.
> region-noncontiguous
I like this name (tho with a final "-p") since it says precisely what
it means.
> Then we could replace in `interactive' calls `region-beginning'
> with `region-beginning-nonstandard' defined as:
No, I'd just replace it with the special constant that says "use things
like region-extract-function". This constant could be just t or `region'.
> But I'm still not sure whether ugly is nicer than hideous,
> so this patch doesn't use it yet.
I think the first thing is to figure out what is the ideal API, ignoring
backward compatibility. In this ideal case, I think we'd just want
a single arg which takes a "region descriptor" (along the lines of what
you described earlier, tho its format would be opaque) with methods like
`region-contiguous-p', `region-beginning', `region-end',
`region-chunks', `region-extract', ...
Then we can try and figure how to adapt it to the real world and how to
get from here to there. But I think it mostly means we'll want to go
from two args (START/END) to just a single arg. So adding an argument
doesn't seem to be the obvious best choice.
Stefan