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Re: Patch: Syntax and Hard Newlines
From: |
Richard Stallman |
Subject: |
Re: Patch: Syntax and Hard Newlines |
Date: |
Sun, 19 Nov 2006 20:37:38 -0500 |
First, I note that in this message you're talking about user-level
behavor. Your previous message, which Miles responded to, proposed an
implementation, and his response was about that implementation, not
the user-level issues. These are two different (though closely
related) topics.
So let's look at the user-level issues you've raised, and how they
relate to implementation.
- longlines-mode substitutes newlines for spaces. This means that any
function based on scan_newline (like `goto-line') may get me results
that are inconsistent with those of tools analyzing the file my buffer
visits. How can I treat compiler or grep output with longlines-mode?
That is true, but I suspect it is not a problem since the broken lines
of compiler output normally won't match the templates for error
messages. (And I am not sure it makes sense to use longlines mode in
such buffers.)
- Matching against the regexp "." may get me different results for the
same buffer with longlines-mode disabled and enabled. Ignore that?
That is true. Whether it is good or bad, I am not sure. It depends on what
the program or the user is trying to achieve.
- longlines-mode may wrap a regexp like "[ \t]*" at the space character.
How can I evaluate a wrapped regexp like that?
The only way to avoid that consequence would be to switch from "soft newlines"
to "power spaces". I am not sure that is a good idea, and do we really
care about making Longlines mode work for Lisp code?
- How can I avoid that longlines-mode wraps a Lisp or Perl expression at
a space preceding a left paren (with the left paren ending up at bol
and messing up `beginning-of-defun-raw' and thus font-locking)?
Likewise.
- How can I avoid that longlines-mode wraps a C string and
`c-font-lock-invalid-string' complains?
Do we really care about making Longlines mode work for C code?
- I put an arbitrary text property on a space character. longlines-mode
wraps the line at that character. How can I restore that property
when turning off longlines-mode?
Longlines mode should preserve other text properties when it converts
a space to a soft newline and vise versa.
- I use two windows of different widths to simultaneously show one and
the same buffer. How can I adapt longlines-mode to wrap at the right
borders of my windows?
It is impossible for anything like Longlines mode to do that.
That would require a feature implemented entirely within redisplay.
There would be no fundamental difficulty in implementing such a
feature inside Emacs redisplay, but it would have to be implemented
entirely in C. It would be a variant of the current feature of line
continuation, and it would share the big inconvenience of line
continuation: all editing commands treat the line that has been
continued as one single line.
- Re: Patch: Syntax and Hard Newlines, (continued)
- Re: Patch: Syntax and Hard Newlines, Stefan Monnier, 2006/11/16
- Re: Patch: Syntax and Hard Newlines, Herbert Euler, 2006/11/16
- Re: Patch: Syntax and Hard Newlines, Stefan Monnier, 2006/11/16
- Re: Patch: Syntax and Hard Newlines, Herbert Euler, 2006/11/17
- Re: Patch: Syntax and Hard Newlines, martin rudalics, 2006/11/17
- Re: Patch: Syntax and Hard Newlines, Herbert Euler, 2006/11/17
- Re: Patch: Syntax and Hard Newlines, martin rudalics, 2006/11/18
- Re: Patch: Syntax and Hard Newlines, Miles Bader, 2006/11/18
- Re: Patch: Syntax and Hard Newlines, martin rudalics, 2006/11/19
- Re: Patch: Syntax and Hard Newlines, Stefan Monnier, 2006/11/19
- Re: Patch: Syntax and Hard Newlines,
Richard Stallman <=
- Re: Patch: Syntax and Hard Newlines, Stefan Monnier, 2006/11/19
- Re: Patch: Syntax and Hard Newlines, Richard Stallman, 2006/11/20
- Re: Patch: Syntax and Hard Newlines, David Kastrup, 2006/11/20
- Re: Patch: Syntax and Hard Newlines, Richard Stallman, 2006/11/22
- Re: Patch: Syntax and Hard Newlines, David Kastrup, 2006/11/22
- Re: Patch: Syntax and Hard Newlines, Richard Stallman, 2006/11/24
- Re: Patch: Syntax and Hard Newlines, Kim F. Storm, 2006/11/26
- Re: Patch: Syntax and Hard Newlines, David Kastrup, 2006/11/26
- Re: Patch: Syntax and Hard Newlines, Kim F. Storm, 2006/11/26
- Re: Patch: Syntax and Hard Newlines, David Kastrup, 2006/11/26