From 5fb7f96d886848f6d3b2401a895fb1e203190ca9 Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Sat, 1 Aug 2020 20:07:22 +0530
Subject: Create a functional setter for ennum-post-translations.

* ennum.el (ennum-make-functional-setter): New macro.
(ennum-post-set-translations): New function.
(ennum-posts): Use ennum-post-set-translations.
---
 ennum.el | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/ennum.el b/ennum.el
index b92ec2c..00927df 100644
--- a/ennum.el
+++ b/ennum.el
@@ -130,11 +130,20 @@ respectively by - and _, and the pad character = is optional."
                      (reverse (ennum-directory-files item nil t))))
            (ennum-input items))))
 
+(defmacro ennum-make-functional-setter (name copier accessor)
+  `(defun ,name (object new-value)
+     (let ((object-copy (,copier object)))
+       (setf (,accessor object-copy) new-value)
+       object-copy)))
+
 (cl-defstruct (ennum-post (:constructor ennum-make-post)
                           (:copier ennum-copy-post))
   filename slug author date language links tangle
   summary tags thumbnail title translation-group translations)
 
+(ennum-make-functional-setter
+ ennum-post-set-translations ennum-copy-post ennum-post-translations)
+
 (cl-defstruct (ennum-link (:constructor ennum-make-link)
                           (:copier nil))
   type path)
@@ -154,13 +163,11 @@ respectively by - and _, and the pad character = is optional."
                                    (ennum-post-slug post)))
                            posts)))
              (seq-map (lambda (post)
-                        (let ((post-copy (ennum-post-copy post)))
-                          (setf (ennum-post-translations post-copy)
-                                (seq-remove (pcase-lambda (`(,_ . ,slug))
-                                              (string= (ennum-post-slug post)
-                                                       slug))
-                                            translations))
-                          post-copy))
+                        (ennum-post-set-translations
+                         post
+                         (seq-remove (pcase-lambda (`(,_ . ,slug))
+                                       (string= (ennum-post-slug post) slug))
+                                     translations)))
                       posts)))
          ;; Read posts from org files and group them by translation
          ;; group.
-- 
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