Custom XHTML layouts

[Sebastian Rose <sebastian_rose@gmx.de>]

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The appended patch allows for custom layouts of the exported XHTML. As
the custom elements are added literally, PHP code could be added too.

Everyone who's informed about my elisp skills will read this with
appropriate scepticism :)

It's merely a proof of conncept, a suggestion.
Maybe we could find a more `template' based solution to make this easier
on non-lispers.

I didn't implement all the containers mentioned in the docstring of
`org-exp-custom-html-function' yet, but it's just adding two lines per
block.

If you add this patch, you'll be able to do the following:

1.) Define a function that add custom HTML elements.

    This example will produce a table layout with the TOC on the left,
    contents on the right. Title and postamble will span both columns.

    (defun sr-org-export-custom-html(which &optional element-start)
      "See the docs of org-exp-custom-html-function"
      (cond
       ((string= which "body")
        (if element-start
            "<div id=\"wrap\">"
          "</div><!-- end of wrap -->"))
       ((string= which "title")
        (if element-start
            "<table width=\"100%\"><tr><td colspan=\"2\">"
          "</td></tr><tr><td>"))
       ((string= which "toc")
        (if element-start
            ""
          "</td><td>"))
       ((string= which "postamble")
        (if element-start
            "</td></tr><tr><td colspan=\"2\">"
          "</td></tr></table>"))
       ))

2.) Add a line to your `org-publish-project-alist'.


        ("org-notes"
         ;; ....
         :publishing-directory "~/develop/htdocs/org-notes/"
         ;; Tell org-exp.el to use a custom function:
         :publishing-function org-publish-org-to-html
         ;; ....

3.) Apply this patch to the current head:


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diff --git a/lisp/org-exp.el b/lisp/org-exp.el
index 95b9ad8..239d387 100644
--- a/lisp/org-exp.el
+++ b/lisp/org-exp.el
@@ -3266,6 +3266,18 @@ in a window.  A non-interactive call will only return the buffer."
 
 (defvar html-table-tag nil) ; dynamically scoped into this.
 (defvar org-par-open nil)
+(defun  org-exp-custom-html-function (which &optional before)
+  "If before is non nil, we're about to start which. which is one of:
+        - 'head'
+        - 'body'
+        - 'title'
+        - 'toc'
+        - 'contents'
+        - 'lot'
+        - 'postamble'
+While 'head' and 'body' are called directly after the the starttags and directly before the endtags
+are added, all the others wrap the element/block they are called for."
+  "")
 ;;;###autoload
 (defun org-export-as-html (arg &optional hidden ext-plist
 			       to-buffer body-only pub-dir)
@@ -3311,6 +3323,8 @@ PUB-DIR is set, use this as the publishing directory."
 			"\n" org-export-html-scripts))
 	 (html-extension (plist-get opt-plist :html-extension))
 	 (link-validate (plist-get opt-plist :link-validation-function))
+	 (html-extension (plist-get opt-plist :html-extension))
+	 (custom-html-function (or (plist-get opt-plist :custom-html-function) 'org-exp-custom-html-function))
 	 valid thetoc have-headings first-heading-pos
 	 (odd org-odd-levels-only)
 	 (region-p (org-region-active-p))
@@ -3494,12 +3508,14 @@ lang=\"%s\" xml:lang=\"%s\">
 "
 		 language language (org-html-expand title)
 		 (or charset "iso-8859-1") date author style))
-
+    (insert (funcall custom-html-function "body" t))
 	(insert (or (plist-get opt-plist :preamble) ""))
 
 	(when (plist-get opt-plist :auto-preamble)
-	  (if title (insert (format org-export-html-title-format
-				    (org-html-expand title))))))
+	  (if title (insert (concat
+                         (funcall custom-html-function "title" t)
+                         (format org-export-html-title-format (org-html-expand title))
+                         (funcall custom-html-function "title"))))))
 
       (if (and org-export-with-toc (not body-only))
 	  (progn
@@ -4047,6 +4063,7 @@ lang=\"%s\" xml:lang=\"%s\">
 		"\n"))
       (unless body-only
 	(when (plist-get opt-plist :auto-postamble)
+      (insert (funcall custom-html-function "postamble" t))
 	  (insert "<div id=\"postamble\">")
 	  (when (and org-export-author-info author)
 	    (insert "<p class=\"author\"> "
@@ -4067,11 +4084,13 @@ lang=\"%s\" xml:lang=\"%s\">
 	  (when org-export-creator-info
 	    (insert (format "<p class=\"creator\">HTML generated by org-mode %s in emacs %s</p>\n"
 			    org-version emacs-major-version)))
-	  (insert "</div>"))
+	  (insert "</div>")
+      (insert (funcall custom-html-function "postamble")))
 
 	(if org-export-html-with-timestamp
 	    (insert org-export-html-html-helper-timestamp))
 	(insert (or (plist-get opt-plist :postamble) ""))
+    (insert (funcall custom-html-function "body"))
 	(insert "</body>\n</html>\n"))
 
       (unless (plist-get opt-plist :buffer-will-be-killed)
@@ -4092,9 +4111,11 @@ lang=\"%s\" xml:lang=\"%s\">
 	  (when (looking-at "\\s-*</p>")
 	    (goto-char (match-end 0))
 	    (insert "\n")))
+    (insert (funcall custom-html-function "toc" t))
 	(insert "<div id=\"table-of-contents\">\n")
 	(mapc 'insert thetoc)
 	(insert "</div>\n"))
+    (insert (funcall custom-html-function "toc"))
       ;; remove empty paragraphs and lists
       (goto-char (point-min))
       (while (re-search-forward "<p>[ \r\n\t]*</p>" nil t)

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Regards,

--
Sebastian Rose, EMMA STIL - mediendesign, Niemeyerstr.6, 30449 Hannover
Tel.:  +49 (0)511 - 36 58 472
Fax:   +49 (0)1805 - 233633 - 11044
mobil: +49 (0)173 - 83 93 417
Http:  www.emma-stil.de

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