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Re: [O] Bug: Export to html fails when link to header in non existing fi

From: Rasmus
Subject: Re: [O] Bug: Export to html fails when link to header in non existing file in document present
Date: Wed, 06 May 2015 15:50:30 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)

Rainer M Krug <address@hidden> writes:

>> What do you expect?
>> Should the "::*SOMETHING"-part be discarded without warning?
> Well - the ideal solution would be a warning (or error message) with a
> reference to the link. At the moment, a link to a non existing file is
> exported, a link to a section in a non existing produces a cryptic
> error message.
> At the moment, I have no clue how I can find the link.
> So I would hope for
> 1) consistent behavior for the two cases
> 2) a meaningful warning which helps to find the culprit
> 3) an html file, where the links do not work, but the export is fine.
> or, if 3) is not possible, meaningful error messages which actually help
> me to track down the error (I only found out what was causing this error
> accidentally)

The issue with warnings is that I don't see them....  Though an error
seems a bit drastic here.

The attached patch inserts a link without the anchor and issues a warning
if exporting such links without ox-publish.

>> The internal link cannot be known without the file, as it is of the form
>> orgheadlineN where N=n+1 and n is the number of headlines prior to
>> "*Something"...
> Sure - this is obvious.

Actually, the error you found is more interesting than what I first
though, as any link with anchors will trigger the error, it seems.
org-publish-cache must be non-nil, which seems to linger on publishing a


Don't panic!!!
>From 8e1dd6c43e8a358a85a8034825c475199bd2ffb7 Mon Sep 17 00:00:00 2001
From: Rasmus <address@hidden>
Date: Wed, 6 May 2015 15:44:26 +0200
Subject: [PATCH] ox-html: Improve links with search

* ox-html.el (org-html-link): Handle links with search when
  not using Publish.

Reported-by: Rainer M Krug <address@hidden>
 lisp/ox-html.el | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/lisp/ox-html.el b/lisp/ox-html.el
index 6c712f6..0e69e6a 100644
--- a/lisp/ox-html.el
+++ b/lisp/ox-html.el
@@ -2849,12 +2849,18 @@ INFO is a plist holding contextual information.  See
            ;; relative to a custom-id, a headline title a name,
            ;; a target or a radio-target.
            (let ((option (org-element-property :search-option link)))
-             (if (not option) raw-path
-               (concat raw-path
-                       "#"
-                       (org-publish-resolve-external-link
-                        option
-                        (org-element-property :path link))))))
+             (cond ((and option org-publish-cache)
+                    (concat raw-path
+                            "#"
+                            (org-publish-resolve-external-link
+                             option
+                             (org-element-property :path link))))
+                   ((and option (not org-publish-cache))
+                    (org-display-warning
+                     (format "Link to file %s cannot be resolved.  Please use 
Org Publish."
+                             (org-element-property :path link)))
+                    raw-path)
+                   (t raw-path))))
           (t raw-path)))
         ;; Extract attributes from parent's paragraph.  HACK: Only do
         ;; this for the first link in parent (inner image link for

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