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

[Carsten Dominik]

Hi Eric, looks good to me, please go ahead and apply this patch.

I would not have expected that this is such a compact change.
The only improvement I can see would be to use org-add-props to
put the properties on the link before inserting it and in this
way shave off a let form.

Thanks!

- Carsten
On Mar 30, 2010, at 8:26 AM, Eric Schulte wrote:

> 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
>
> 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)
>
>
> Carsten Dominik <address@hidden> 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

- Carsten