On Sun, 11 Aug 2013 09:33:35 +0300, Beni Cherniavsky-Paskin <c...@users.sf.net>
wrote:
> A natural keystroke would be M-C-d / M-C-u (down/up-list) as if you were
> really moving across a "(".
> There should be visual feedback, a-la match-parens. With feedback I think
> you also want Right/Left to move across the virtual "(".
Sounds sensible.
> The deeper you go into the rabbit hole of pretending there is a paren, the
> harder it is to implement consistently - e.g. saving & restoring point
> should preserve this state (including via save-excursions!) - except by
> actually having an invisible char in the buffer.
I don't think that's all that necessary, as long as there's visual feedback
of the scope. In particular, invisible chars are nothing but trouble
(you could store that info in a separate file without problems).
> n-exprs present another ambiguity:
> |foo(bar)
> moves over foo or foo(bar)?
Ah, excellent point. Basically, there are *two* ambiguities:
* At the beginning of a t-expr that isn't a mono n-expr,
do we mean the first n-expr or the whole t-expr?
* At the beginning of an n-expr that has a tail,
do we mean the prefix, the whole n-expr, or in between (partial tail)?
I think a plausible default would be, if you're at the *very* first char
of the expression, choose the longer one, and have a keystroke that
can progressively change the scope (narrowing until you can't narrow more,
and then cycling back). In most cases you could also
move right to change the scope (exception: 1-letter prefixes).
I think the *REAL* key is visual feedback. As long as the editor shows
the scope of an s-expr, what it'll do next would be unsurprising.
And in fact, that visual feedback is useful regardless.
But again, I think trying things out is the real key.
Anyone want to try creating an emacs mode?
--- David A. Wheeler
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