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Re: cperl-mode and fontlock

From: Harry Putnam
Subject: Re: cperl-mode and fontlock
Date: Fri, 25 Sep 2009 17:29:45 -0500
User-agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.1.50 (gnu/linux)

  [ALERT - I've attempted cross posting this to devel as 
  well -ED address@hidden

Ilya Zakharevich <address@hidden> writes:

> On 2009-09-17, Harry Putnam <address@hidden> wrote:
>> As I enter code... syn-hilite appears to be working just as expected
>> but as time wears on and some of the code scrolls off the screen,
>> Eventually when viewed later syn-hilite has disappeared in all but a
>> few items.
>> Just scrolling code off visible area and back doesn't appear to do it
>> ... I'm not sure exactly what does.
>> If I return to edit some already entered code that has lost its
>> syn-hilite, the hilite returns the instant I make any
>> modification. But then later I see its left again.
>> Calling M-x `font-lock-fontify-buffer' does not seem to re-instate the
>> syntax highlight where it has already gone away either.
>                    ^^^^^
> What is this "where"?  Region of buffers, or buffers as a whole?

Sorry, even though english is my first language I speak it with near

`where' was supposed to mean any spots in the code where font-locking
has already stopped working, are not revivied by M-x
font-lock-fontify-buffer.  That is, I can see some code with no
font-locking visible in current buffer, but it does not get fixed when
font-lock-fontify-buffer is run.

That isn't quite right either, because some of it does get fixed.
Also with the M-x normal-mode seems to re-font-lock something but not
others.   Very confusing and maddening.

If I edit a block where many elements have lost syntax coloring... For
a brief while the syntax coloring is re-established near the cursor

Maybe 2/3 lines in either direction.

Another part to this... not sure if its related is that mic-paren-mode
is now giving false readings at times... I've never noticed that

Any (`) backtick between matching parens (even in comments...) might
cause a false reading it seems

> Just 2 pieces of how I view similar problems:
>   a) cperl-mode distributed with RMS Emacs is completely borken.  See
>      "my" versions;

This is the version that came with emacs-23:
(From top of the file)

;;; cperl-mode.el --- Perl code editing commands for Emacs

;; Copyright (C) 1985, 1986, 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
;; 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
;;     Free Software Foundation, Inc.

;; Author: Ilya Zakharevich
;;      Bob Olson
;; Maintainer: Ilya Zakharevich <address@hidden>
;; Keywords: languages, Perl

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribut...


Is there something newer or better available?
>   b) I think I have seen things similar to what you describe - about
>      5-7 years ago.

It appears my version of cperl-mode is not totally outdated eh?.

Any other problems that might cause this? something to do with shadow
paths or whatever its called?

I went to the cperl-mode.el file by calling M-x find-library inside
emacs.  So, I guess that means that is the one loading... right.

Any other input would be greatly appreciated... My coding skills are
terrible enough without having syntax coloring problems.

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