From b1b76a30ed130dd5c077237e2c26bac5ce62cd3b Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Sat, 14 Mar 2020 19:20:26 +0530
Subject: Handle image links with separate transcoder.

* ennu-html.el (ennu-html-link): New function.
(ennu-html): Add ennu-html-link transcoder. Remove
:html-inline-image-rules option.
(ennu-export-image): Delete function. Unregister it from
org-link-parameters.
---
 ennu-html.el | 53 ++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 34 insertions(+), 19 deletions(-)

diff --git a/ennu-html.el b/ennu-html.el
index bf7cb0f..b1cf217 100644
--- a/ennu-html.el
+++ b/ennu-html.el
@@ -195,11 +195,10 @@
 
 (org-export-define-derived-backend 'ennu-html 'html
   :translate-alist
-  '((inner-template . ennu-html-inner-template))
+  '((inner-template . ennu-html-inner-template)
+    (link . ennu-html-link))
   :options-alist
-  '((:html-inline-image-rules
-     nil nil '(("image" . "\\.\\(jpeg\\|jpg\\|png\\|gif\\|svg\\)\\'")) t)
-    (:summary "SUMMARY" nil nil parse)
+  '((:summary "SUMMARY" nil nil parse)
     (:thumbnail "THUMBNAIL" nil nil t)
     (:translation-group "TRANSLATION_GROUP" nil nil t)))
 
@@ -265,6 +264,37 @@
    (org-html-footnote-section info)
    "</article>"))
 
+(defun ennu-html-link (link desc info)
+  ;; We override the html link transcoder to handle image links
+  ;; differently. We cannot use the `:export' property of
+  ;; `org-link-parameters' since those functions cannot access the
+  ;; `info' communication channel.
+  (let ((path (org-element-property :path link)))
+    (pcase (org-element-property :type link)
+      ("image"
+       ;; Convert image links to file links, get them transcoded by
+       ;; `org-html-link' and then remove the file:// scheme from the
+       ;; URI. Finally insert the transcoded image link in a link to a
+       ;; larger image as specified by the :image-link-width setting.
+       (format "<a href=\"%s\">%s</a>"
+               (expand-file-name*
+                (ennu-image-output-filename
+                 path (ennu-setting :image-link-width))
+                (ennu-setting :images-directory))
+               (replace-regexp-in-string
+                "src=\"file://" "src=\""
+                (org-html-link
+                 (org-element-put-property
+                  (org-element-put-property
+                   link :path (expand-file-name*
+                               (ennu-image-output-filename
+                                path (ennu-setting :default-image-width))
+                               (ennu-setting :images-directory)))
+                  :type "file")
+                 desc info))))
+      ;; Pass other link types to org-html-link
+      (_ (org-html-link link desc info)))))
+
 ;; TODO: Pass title through org-export-data-with-backend or something
 ;; similar in order to export org syntax in title
 (defun ennu-export-post (path desc backend)
@@ -277,21 +307,6 @@
 (org-link-set-parameters
  "post" :export 'ennu-export-post)
 
-(defun ennu-export-image (path desc backend)
-  (let ((img `(img :src ,(expand-file-name*
-                          (ennu-image-output-filename
-                           path (ennu-setting :default-image-width))
-                          (ennu-setting :images-directory)))))
-    (xmlgen (if (ennu-setting :image-link-width)
-                `(a :href ,(expand-file-name*
-                            (ennu-image-output-filename
-                             path (ennu-setting :image-link-width))
-                            (ennu-setting :images-directory))
-                    ,img)
-              img))))
-
-(org-link-set-parameters
- "image" :export 'ennu-export-image)
 
 (defun ennu-export-thumbnail (path desc backend)
   (xmlgen
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