From 14d46e1aefa33f3ca2d14db6aa2e54623c7a069d Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Sat, 1 Aug 2020 21:42:32 +0530
Subject: Embed post link target title in post-link object.

* ennum.el (ennum-post-set-links, ennum-post-link-set-target-title): New functions.
(ennum-post-link): New type.
(ennum--read-post): Create post-link object when applicable.
(ennum-posts): Set target-title slot of post-link objects.
---
 ennum.el | 55 +++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 45 insertions(+), 10 deletions(-)

diff --git a/ennum.el b/ennum.el
index 00927df..6cd5757 100644
--- a/ennum.el
+++ b/ennum.el
@@ -144,10 +144,21 @@ respectively by - and _, and the pad character = is optional."
 (ennum-make-functional-setter
  ennum-post-set-translations ennum-copy-post ennum-post-translations)
 
+(ennum-make-functional-setter
+ ennum-post-set-links ennum-copy-post ennum-post-links)
+
 (cl-defstruct (ennum-link (:constructor ennum-make-link)
                           (:copier nil))
   type path)
 
+(cl-defstruct (ennum-post-link (:constructor ennum-make-post-link)
+                                (:copier ennum-copy-post-link)
+                                (:include ennum-link (type 'post)))
+  target-title)
+
+(ennum-make-functional-setter
+ ennum-post-link-set-target-title ennum-copy-post-link ennum-post-link-target-title)
+
 (cl-defstruct (ennum-video-link (:constructor ennum-make-video-link)
                                 (:copier nil)
                                 (:include ennum-link (type 'video)))
@@ -169,16 +180,35 @@ respectively by - and _, and the pad character = is optional."
                                        (string= (ennum-post-slug post) slug))
                                      translations)))
                       posts)))
-         ;; Read posts from org files and group them by translation
-         ;; group.
-         (seq-group-by
-          'ennum-post-translation-group
-          (ennum--filter-map
-           (lambda (file)
-             (when (string= (file-name-extension file) "org")
-               (ennum-read-post
-                (ennum--expand-relative file (ennum-setting :posts-directory)))))
-           (ennum-directory-files (ennum-setting :posts-directory)))))
+         (let ((posts
+                ;; Read posts from org files.
+                (ennum--filter-map
+                 (lambda (file)
+                   (when (string= (file-name-extension file) "org")
+                     (ennum-read-post
+                      (ennum--expand-relative file (ennum-setting :posts-directory)))))
+                 (ennum-directory-files (ennum-setting :posts-directory)))))
+           ;; Group posts by translation group.
+           (seq-group-by
+            'ennum-post-translation-group
+            ;; Set target title slot of post links.
+            (seq-map
+             (lambda (post)
+               (ennum-post-set-links
+                post
+                (seq-map (lambda (link)
+                           (if (and (ennum-post-link-p link)
+                                    (eq (ennum-post-link-target-title link) 'required))
+                               (ennum-post-link-set-target-title
+                                link
+                                (seq-some (lambda (post)
+                                            (when (string= (ennum-post-slug post)
+                                                           (ennum-link-path link))
+                                              (ennum-post-title post)))
+                                          posts))
+                             link))
+                         (ennum-post-links post))))
+             posts))))
         'ennum-later-post-p))
 
 (defun ennum-later-post-p (post1 post2)
@@ -206,6 +236,11 @@ respectively by - and _, and the pad character = is optional."
                            (let ((link-type (org-element-property :type link))
                                  (path (org-element-property :path link)))
                              (pcase link-type
+                               ("post"
+                                (ennum-make-post-link
+                                 :path path
+                                 :target-title (if (org-element-contents link)
+                                                   'not-required 'required)))
                                ("video"
                                 (ennum-make-video-link
                                  :path path
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