Re: feature request: save LaTeX as title for ltxpng html images

From: "Eric Schulte" <schulte.eric@gmail.com>
To: Carsten Dominik <carsten.dominik@gmail.com>
Cc: Org Mode <emacs-orgmode@gnu.org>
Subject: Re: feature request: save LaTeX as title for ltxpng html images
Date: Tue, 30 Mar 2010 00:26:25 -0600	[thread overview]
Message-ID: <87ljdaba0e.fsf@gmail.com> (raw)
In-Reply-To: <EA8A8165-F245-494B-B0E3-3054B2A1C70C@gmail.com> (Carsten Dominik's message of "Fri, 26 Mar 2010 21:42:16 +0100")

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Hi,

The attached patch places the latex source into alt html image tags as
described below.  I think it should be safe, in that I remove all "s
from inside of the alt string.

Thanks for the implementation advice -- Eric


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diff --git a/lisp/org-html.el b/lisp/org-html.el
index b8925e7..2246daf 100644
--- a/lisp/org-html.el
+++ b/lisp/org-html.el
@@ -1529,7 +1529,8 @@ lang=\"%s\" xml:lang=\"%s\">
   "Create image tag with source and attributes."
   (save-match-data
     (if (string-match "^ltxpng/" src)
-	(format "<img src=\"%s\"/>" src)
+	(format "<img src=\"%s\" alt=\"%s\"/>"
+                src (org-find-text-property-in-string 'org-latex-src src))
       (let* ((caption (org-find-text-property-in-string 'org-caption src))
 	     (attr (org-find-text-property-in-string 'org-attributes src))
 	     (label (org-find-text-property-in-string 'org-label src)))
	Modified lisp/org.el
diff --git a/lisp/org.el b/lisp/org.el
index e30c49a..480e9f1 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -15183,7 +15183,12 @@ Some of the options can be changed using the variable
 		  (push ov org-latex-fragment-image-overlays)
 		  (goto-char end))
 	      (delete-region beg end)
-	      (insert link))))))))
+              (let ((link-beg (point))
+                    (link-end (progn (insert link) (point))))
+                (add-text-properties
+                 link-beg link-end
+                 (list 'org-latex-src
+                       (replace-regexp-in-string "\"" "" txt)))))))))))
 
 ;; This function borrows from Ganesh Swami's latex2png.el
 (defun org-create-formula-image (string tofile options buffer)


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Carsten Dominik <carsten.dominik@gmail.com> writes:

> On Mar 26, 2010, at 4:01 PM, Eric Schulte wrote:
>
>> Hi,
>>
>> HTML <img> tags allow both alternate text (rendered when the image
>> can't
>> be rendered), as well as titles which show as tooltips on hover.  I
>> wonder if it would be difficult to place the text latex used in
>> generating an image into these two fields.  If not then I at least
>> would
>> find it useful.
>
> It is not trivial, but not too hard either.
>
> It is not trivial because Org first produces the images and inserts
> org-style links. Later, in a second step, these links are replaced
> (formatted for HTML).
> One way to solve this is that `org-format-latex' will add this
> information
> as text properties to the link.  Then later, when the HTML formatting
> is done,
> the text property could be retrieved and converted into the attributes
> you are mentioning.
>
> You have worked on org-format-latex before, I think this should be
> relatively easy for you.
>
> - Carsten

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