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Re: syntax highlighting on the fly
From: |
lee |
Subject: |
Re: syntax highlighting on the fly |
Date: |
Fri, 07 Mar 2014 19:43:43 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) |
Drew Adams <drew.adams@oracle.com> writes:
> See http://stackoverflow.com/a/21997150/729907, which is about
> highlighting the symbol at point or under the mouse pointer.
> There are multiple approaches with different advantages.
Thanks! Those don´t really seem to be what I´m looking for, though.
> (Remember too that `C-s C-w C-w...' will also highlight
> occurrences of text at point, albeit transiently.)
Hm, I have bound C-s to isearch-forward-regexp ...
So far, hi-lock-mode is great. I have found that when writing new
patterns to the buffer, they first need to be removed to avoid adding
them multiple times. This has lead to:
(defun lsl-hi-lock-remove ()
"Remove hi-lock-mode patterns from the beginning of the buffer.
You may want to customize hi-lock-file-patterns-range when you
have many patterns."
(interactive)
(let ((startpos nil)
(target-regexp (concat "\\<" hi-lock-file-patterns-prefix ":")))
(save-excursion
(save-restriction
(widen)
(goto-char (point-min))
(re-search-forward target-regexp
(+ (point) hi-lock-file-patterns-range) t)
(beginning-of-line)
(setq startpos (point))
(while (and (re-search-forward target-regexp (+ (point) 100) t)
(not (looking-at "\\s-*end")))
(end-of-line)
(condition-case nil
(delete-region startpos (point))
(error (message "Invalid pattern list expression at %d"
(line-number-at-pos)))))))))
(defun lsl-hi-lock-add (whichface)
"Add the symbol at point to the patterns highlighted through
hi-lock-mode; then write the current patterns to the beginning of
the file.
The argument whichface specifies which face to use for the
highlighting.
You may want to customize hi-lock-file-patterns-range when you
have many patterns."
(lsl-hi-lock-remove)
(let* ((regexp (hi-lock-regexp-okay (find-tag-default-as-symbol-regexp))))
(hi-lock-set-pattern regexp whichface))
(save-excursion
(goto-char (point-min))
(hi-lock-write-interactive-patterns)))
(defun lsl-hi-lock-constant ()
(interactive)
(lsl-hi-lock-add font-lock-comment-delimiter-face))
(defun lsl-hi-lock-functionlike ()
(interactive)
(lsl-hi-lock-add font-lock-warning-face))
I have bound (lsl-hi-lock-constant) and (lsl-hi-lock-functionlike) to
C-w c and C-w f, respectively.
But there is a problem: When I restart emacs and visit a buffer that
has hi-lock patterns at the beginning, they are applied just fine, but
they cannot be written to the buffer again. It´s like hi-lock-mode
doesn´t know that they exist, though the highlighting works as expected.
Only newly created patterns can be written to the buffer. That means
when I use (lsl-hi-lock-constant), the existing patterns are removed and
only the new one is added.
Is there a way to make the existing patterns, as specified in the
buffer, known to hi-lock-mode in such a way that they can be added to
the buffer again like the new ones can with
(hi-lock-write-interactive-patterns)?
Is this a bug? Isn´t hi-lock-mode supposed to know which patterns are
in use and to be able to write them to the buffer?
And another question: Is there a way to apply the patterns for a number
of buffers? Suppose I work on some project which involves several
files. Some of these files use a constant "foobar". Now I would have
to add to all of these files a pattern to highlight "foobar". How do I
make it so that, let´s say, hi-lock-mode reads the patterns from a
common file that holds all patterns relevant for the project so that I
don´t need to add them to every file in question?
Please don´t tell me that what I´m looking for doesn´t exist ...
--
Knowledge is volatile and fluid. Software is power.