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.
+...@item #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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