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[Orgmode] Bug: HTML export of link to target in another file


From: Dan Davison
Subject: [Orgmode] Bug: HTML export of link to target in another file
Date: Thu, 18 Mar 2010 18:52:35 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)

Below are a bug report, a tentative patch and a proposed doc patch.

Bug report
==========
If I have this:

A [[file:zz.org::#mytarget][link]] to a target with a custom ID

and export it to HTML, I get

A <a href="zz.html##mytarget">link</a> to a target with a custom ID

which (in firefox on linux) links to the file but does not jump to the
target. However, if I change the '##' to '#' then firefox jumps to the
correct location. Is this an org bug?

Very tentatively proposed patch
===============================
I've investigated a bit (notes below), resulting in this proposed patch:

--8<---------------cut here---------------start------------->8---
diff --git a/lisp/org-html.el b/lisp/org-html.el
index aa70408..5ee5b19 100644
--- a/lisp/org-html.el
+++ b/lisp/org-html.el
@@ -1110,7 +1110,7 @@ lang=\"%s\" xml:lang=\"%s\">
                     (abs-p (file-name-absolute-p filename))
                     thefile file-is-image-p search)
                (save-match-data
-                 (if (string-match "::\\(.*\\)" filename)
+                 (if (string-match "::#?\\(.*\\)" filename)
                      (setq search (match-string 1 filename)
                            filename (replace-match "" t nil filename)))
                  (setq valid
--8<---------------cut here---------------end--------------->8---

Doc patch
=========
The link above (file:zz.org::#mytarget) was created by C-c l on a
heading with a CUSTOM_ID property. However, I couldn't see where in the
manual links of this form are documented. Do we need to add this link
type to section 4.7 "Search options in file links", e.g.

--8<---------------cut here---------------start------------->8---
diff --git a/doc/org.texi b/doc/org.texi
index f49f056..c8cc1a5 100644
--- a/doc/org.texi
+++ b/doc/org.texi
@@ -3116,6 +3116,7 @@ link, together with an explanation:
 [[file:~/code/main.c::255]]
 [[file:~/xx.org::My Target]]
 [[file:~/xx.org::*My Target]]
+[[file:~/xx.org::#my-custom-id]]
 [[file:~/xx.org::/regexp/]]
 @end example
 
@@ -3130,6 +3131,8 @@ link will become an HTML reference to the corresponding 
named anchor in
 the linked file.
 @item *My Target
 In an Org file, restrict search to headlines.
address@hidden #my-custom-id
+Link to a heading with a @code{CUSTOM_ID} property
 @item /regexp/
 Do a regular expression search for @code{regexp}.  This uses the Emacs
 command @code{occur} to list all matches in a separate window.  If the
--8<---------------cut here---------------end--------------->8---

Notes
=====
At line 1134 of org-html.el there is

                        (setq thefile (concat thefile "#"
                                              (org-solidify-link-text
                                               (org-link-unescape search)))))

during evaluation of which 'search is bound to "#mytarget", which
suggested that the problem might be in the regexp parsing creating
'search.

Dan




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