Re: text color + highlight

From: "Eric Schulte" <schulte.eric@gmail.com>
To: Vinh Nguyen <vinhdizzo@gmail.com>
Cc: emacs-orgmode@gnu.org, Bastien <bastien.guerry@wikimedia.fr>
Subject: Re: text color + highlight
Date: Fri, 06 Aug 2010 17:51:36 -0400	[thread overview]
Message-ID: <87mxszcsuv.fsf@gmail.com> (raw)
In-Reply-To: <AANLkTikF_BOrjHFfFNEPRA0n+TM6DR8rpuTCThvTp-j4@mail.gmail.com> (Vinh Nguyen's message of "Fri, 6 Aug 2010 09:47:03 -0700")

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Hi,

I've recently seen similar requests on this list.

The attached patch provides a first pass at this support implementing
both in-buffer coloring given the following syntax, and html export (I
don't know the correct LaTeX syntax, but it shouldn't be hard to extend
this to LaTeX as well).  This uses something like the LaTeX Beamer
\color{}{} directive, for example...

  My name is \color{red}{eric} schulte.

Would result in the word "eric" appearing in red.  Even though I
implemented the syntax above, I'm *not* recommending this syntax, it
feels decidedly more like "latex" than "org", it was simply the only
obvious option for this initial implementation.

-- Eric


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From a488b43b66971b16f63141d29cb61f44b959abfa Mon Sep 17 00:00:00 2001
From: Eric Schulte <schulte.eric@gmail.com>
Date: Fri, 6 Aug 2010 11:29:33 -0400
Subject: [PATCH] introduction of colorization for html output

* lisp/org-exp.el (org-export-with-color): new customization parameter
  controlling the code colorization on export

* lisp/org-html.el (org-html-do-expand): conditional application of
  string colorization in html

  (org-export-html-colorize): apply html colorization to org-mode text

* lisp/org.el (org-fontify-colorized-text): add option to control
  in-buffer colorization of the text

  (org-do-colorize-faces): function which applies color to a buffer

  (org-set-font-lock-defaults): add coloring to the org-mode
  fontification loop
---
 lisp/org-exp.el  |    5 +++++
 lisp/org-html.el |   18 ++++++++++++++++++
 lisp/org.el      |   27 +++++++++++++++++++++++++++
 3 files changed, 50 insertions(+), 0 deletions(-)

diff --git a/lisp/org-exp.el b/lisp/org-exp.el
index 6fc5109..991a555 100644
--- a/lisp/org-exp.el
+++ b/lisp/org-exp.el
@@ -445,6 +445,11 @@ This option can also be set with the +OPTIONS line, e.g. \"*:nil\"."
   :group 'org-export-translation
   :type 'boolean)
 
+(defcustom org-export-with-color t
+  "Non-nil means apply colors to exported text."
+  :group 'org-export-translation
+  :type 'boolean)
+
 (defcustom org-export-with-footnotes t
   "If nil, export [1] as a footnote marker.
 Lines starting with [1] will be formatted as footnotes.
diff --git a/lisp/org-html.el b/lisp/org-html.el
index a12141f..3d3bdcb 100644
--- a/lisp/org-html.el
+++ b/lisp/org-html.el
@@ -2060,6 +2060,8 @@ If there are links in the string, don't modify these."
 	(setq s (replace-match "<\\1>" t nil s))))
   (if org-export-with-emphasize
       (setq s (org-export-html-convert-emphasize s)))
+  (if org-export-with-color
+      (setq s (org-export-html-colorize s)))
   (if org-export-with-special-strings
       (setq s (org-export-html-convert-special-strings s)))
   (if org-export-with-sub-superscripts
@@ -2131,6 +2133,22 @@ If there are links in the string, don't modify these."
 	(setq s (1+ s))))
     string))
 
+(defun org-export-html-colorize (string)
+  "Apply colors."
+  (replace-regexp-in-string
+   "\\\\color{\\(.+?\\)}{\\(.+?\\)}"
+   (lambda (text)
+     (let ((ind 7) (length (length text)))
+       (while (and (< ind length)
+		   (not (string= (substring text ind (+ 2 ind)) "}{")))
+	 (setq ind (+ 1 ind)))
+       (if (get-text-property (match-beginning 0) 'org-protected string)
+	   text
+	 (concat "<span style=\"color: " (substring text 7 ind)
+		 ";\">" (substring text (+ 2 ind) (- length 1))
+		 "</span>"))))
+   string))
+
 (defun org-open-par ()
   "Insert <p>, but first close previous paragraph if any."
   (org-close-par-maybe)
diff --git a/lisp/org.el b/lisp/org.el
index d2c1fdf..fe98fb0 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -3282,6 +3282,12 @@ Changing this variable requires a restart of Emacs to take effect."
   :group 'org-appearance
   :type 'boolean)
 
+(defcustom org-fontify-colorized-text t
+  "Non-nil means colorize colored text.
+Changing this variable requires a restart of Emacs to take effect."
+  :group 'org-appearance
+  :type 'boolean)
+
 (defcustom org-fontify-whole-heading-line nil
   "Non-nil means fontify the whole line for headings.
 This is useful when setting a background color for the
@@ -4920,6 +4926,21 @@ The time stamps may be either active or inactive.")
       (backward-char 1))
     rtn))
 
+(defun org-do-colorize-faces (limit)
+  "Run through the buffer and add overlays to colored text."
+  (let ((org-color-re "\\\\color{\\(.+?\\)}{\\(.+?\\)}"))
+    (while (re-search-forward org-color-re limit t)
+      ;; hide wrapper
+      (add-text-properties (match-beginning 0) (+ 2 (match-end 1))
+			   '(invisible org-link))
+      (add-text-properties (- (match-end 0) 1) (match-end 0)
+			   '(invisible org-link))
+      ;; color text
+      (font-lock-prepend-text-property (match-beginning 2) (match-end 2)
+				       'face
+				       `((t (:foreground ,(match-string 1))))))
+    rtn))
+
 (defun org-emphasize (&optional char)
   "Insert or change an emphasis, i.e. a font like bold or italic.
 If there is an active region, change that region to a new emphasis.
@@ -5367,6 +5388,7 @@ For plain list items, if they are matched by `outline-regexp', this returns
 
 (defun org-set-font-lock-defaults ()
   (let* ((em org-fontify-emphasized-text)
+	 (co org-fontify-colorized-text)
 	 (lk org-activate-links)
 	 (org-font-lock-extra-keywords
 	  (list
@@ -5429,6 +5451,11 @@ For plain list items, if they are matched by `outline-regexp', this returns
                (if (featurep 'xemacs)
                    '(org-do-emphasis-faces (0 nil append))
                  '(org-do-emphasis-faces)))
+	   ;; Color
+	   (if co
+               (if (featurep 'xemacs)
+                   '(org-do-colorize-faces (0 nil append))
+                 '(org-do-colorize-faces)))
 	   ;; Checkboxes
 	   '("^[ \t]*\\([-+*]\\|[0-9]+[.)]\\) +\\(\\[[- X]\\]\\)"
 	     2 'org-checkbox prepend)
-- 
1.7.0.4


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Vinh Nguyen <vinhdizzo@gmail.com> writes:

> On Fri, Aug 6, 2010 at 2:18 AM, Bastien <bastien.guerry@wikimedia.fr> wrote:
>> Hi Vinh,
>>
>> Vinh Nguyen <vinhdizzo@gmail.com> writes:
>>
>>> I was wondering if there is an easy way to markup the color of the
>>> text for html output (and highlight as well).  When I prepare meeting
>>> minutes I'd like to color some things and highlight certain things.
>>> Right now, I am using emphasizing a major portion of the text.  It
>>> would be great to have colors and highlights to draw attention to
>>> certain items.
>>
>> I don't understand your request: what portion of org-mode buffer do you
>> want to highlight?  based on what criteria?
>>
>
> Apologies for the ambiguity.  In the org, we can use *text* and the
> word "text" would be bold in the html output.  I was wondering if
> there is a markup that would change the color, eg, \{red}[text], or
> something of that sort.  I don't think it exists.  If I wanted to
> implement this myself, what should I start with.  Ditto with
> highlights (say, highlight text yellow).
>
> Something more on org-mode's line would be like setting a variable
> #+ color=red
> and with some new symbols, say ^text^, the color of "text" would be
> red in the html output.
>
> Hope this clears things up.
>> --
>>  Bastien
>>
>
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