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RE: widen-one-level [was: Emacs's handling of line numbers]
From: |
Drew Adams |
Subject: |
RE: widen-one-level [was: Emacs's handling of line numbers] |
Date: |
Sun, 18 Apr 2010 17:25:50 -0700 |
> > If you want to get a quick idea what this would be like, eval this
> > code and bind `widen-one-level' (e.g. to `C-x n w' ;-)).
>
> I propose a better UI compatible with current commands:
> bind `C-x n w' to a new user command `widen-command' that
> by default works exactly like `widen' currently works,
> i.e. without a prefix argument, widen completely.
>
> But with a numeric prefix it will widen that many levels,
> e.g. `C-u 1 C-x n w' for one level.
I prefer something like this:
http://www.emacswiki.org/emacs/wide-n.el
It follows this suggestion I made:
>> Another possibility would be to make a restriction ring,
>> instead of a stack, and let you browse among the restrictions...
* The binding is `C-x n x', not `C-x n w'.
You can still use `C-x n w' normally.
* You can repeat the `x' to cycle: `C-x n x x x'...
* Use a plain prefix arg (`C-u') to widen completely.
* Use a prefix arg N < 0 to widen completely and empty the ring.
* Use a prefix arg N >= 0 to go to the Nth previous restriction.
You can have any number of regions that you can return to as restrictions. They
can be, but need not be, nested.
---
One question I have, at least for this library if something like this is not
added to Emacs: In which of the two categories of primitive functions is
`narrow-to-region' (quoting from Stefan's mail to bug #5863 thread):
> there are several categories of functions:
> - functions that have their own byte-code (things like widen,
> car, cdr, ...).
> - functions that are implemented in C but don't have their own
> byte-code.
> - other functions.
>
> Pieces of advice on the first kind of functions only work for
> calls from interpreted Lisp code. Pieces of advice on the
> second kind of functions only work for calls from Lisp code
> (both interpreted and byte-compiled).
If `narrow-to-region' has its own byte-code, then I'll add a note to the library
telling users not to byte-compile it.
And for future reference, how to tell whether a primitive has its own byte-code?
And shouldn't this info about advising primitives be documented? (see bug #5863)
- Re: Emacs's handling of line numbers [from bug#5042], (continued)
- Re: Emacs's handling of line numbers [from bug#5042], Mark Lillibridge, 2010/04/17
- Re: Emacs's handling of line numbers [from bug#5042], Eli Zaretskii, 2010/04/17
- Re: Emacs's handling of line numbers [from bug#5042], Stefan Monnier, 2010/04/17
- Re: Emacs's handling of line numbers [from bug#5042], Eli Zaretskii, 2010/04/17
- Re: Emacs's handling of line numbers [from bug#5042], Mark Lillibridge, 2010/04/17
- Re: Emacs's handling of line numbers [from bug#5042], Eli Zaretskii, 2010/04/17
- Re: Emacs's handling of line numbers [from bug#5042], Juanma Barranquero, 2010/04/17
- RE: Emacs's handling of line numbers [from bug#5042], Drew Adams, 2010/04/17
- widen-one-level [was: Emacs's handling of line numbers], Drew Adams, 2010/04/18
- Re: widen-one-level [was: Emacs's handling of line numbers], Juri Linkov, 2010/04/18
- RE: widen-one-level [was: Emacs's handling of line numbers],
Drew Adams <=
- Re: widen-one-level [was: Emacs's handling of line numbers], Davis Herring, 2010/04/18
- Re: widen-one-level [was: Emacs's handling of line numbers], Richard Stallman, 2010/04/19
- RE: widen-one-level [was: Emacs's handling of line numbers], Drew Adams, 2010/04/19
- Re: widen-one-level [was: Emacs's handling of line numbers], Juri Linkov, 2010/04/19
- Re: widen-one-level [was: Emacs's handling of line numbers], Leo, 2010/04/18
- RE: widen-one-level [was: Emacs's handling of line numbers], Drew Adams, 2010/04/18
- Re: widen-one-level [was: Emacs's handling of line numbers], Leo, 2010/04/19
- RE: widen-one-level [was: Emacs's handling of line numbers], Drew Adams, 2010/04/19
- Re: widen-one-level [was: Emacs's handling of line numbers], Leo, 2010/04/19
- RE: widen-one-level [was: Emacs's handling of line numbers], Drew Adams, 2010/04/19