Add date field to albums

README.org

@@ -43,7 +43,7 @@ The library is implemented around a set of entities.
 | *Name*           | *Type*    | *Fields*             | *Description*                                           |
 |------------------+-----------+----------------------+---------------------------------------------------------|
 | song             | structure | name, album, file, … |                                                         |
-| album            | structure | name, artist         |                                                         |
+| album            | structure | name, date, artist   |                                                         |
 | artist           | structure | name                 |                                                         |
 | genre            | structure | name                 |                                                         |
 | directory        | structure | name, path           |                                                         |

libmpdel.el

@@ -33,6 +33,7 @@
 (require 'tq)
 (require 'cl-lib)
 (require 'subr-x)
+(require 'seq)
 
 
 ;;; Customization
@@ -171,6 +172,7 @@ message from the server.")
                (:constructor libmpdel--album-create)
                (:conc-name libmpdel--album-))
   (name nil :read-only t)
+  (date nil :read-only t)
   (artist nil :read-only t))
 
 (cl-defstruct (libmpdel-song
@@ -352,9 +354,16 @@ If the SONG's name is nil, return the filename instead."
   "Return the track number of SONG within its album."
   (or (libmpdel--song-track song) ""))
 
-(defun libmpdel-entity-date (song)
-  "Return the date of SONG."
-  (or (libmpdel--song-date song) ""))
+(cl-defgeneric libmpdel-entity-date (entity)
+  "Return the date of ENTITY.")
+
+(cl-defmethod libmpdel-entity-date ((album libmpdel-album))
+  "Return ALBUM's date."
+  (libmpdel--album-date album))
+
+(cl-defmethod libmpdel-entity-date ((song libmpdel-song))
+  "Return SONG's date."
+  (libmpdel--song-date song))
 
 (defun libmpdel-song-disc (song)
   "Return the disc number of SONG within its album."
@@ -390,9 +399,7 @@ If the SONG's name is nil, return the filename instead."
    :file (cdr (assq 'file song-data))
    :performers (libmpdel--artists-create (libmpdel-entries song-data 'Performer))
    :genres (libmpdel--genres-create (libmpdel-entries song-data 'Genre))
-   :album (libmpdel--album-create
-           :name (cdr (assq 'Album song-data))
-           :artist (libmpdel--artist-create :name (cdr (assq 'Artist song-data))))
+   :album (libmpdel--create-album-from-data song-data)
    :date (cdr (assq 'Date song-data))
    :disc (cdr (assq 'Disc song-data))
    :id (cdr (assq 'Id song-data))
@@ -402,6 +409,17 @@ If the SONG's name is nil, return the filename instead."
   "Return a list of songs from DATA, a server's response."
   (mapcar #'libmpdel--create-song-from-data (libmpdel-group-data data)))
 
+(defun libmpdel--create-album-from-data (song-data)
+  "Return an album from SONG-DATA, a server's response."
+  (libmpdel--album-create
+   :name (cdr (assq 'Album song-data))
+   :date (cdr (assq 'Date song-data))
+   :artist (libmpdel--artist-create :name (cdr (assq 'Artist song-data)))))
+
+(defun libmpdel--create-albums-from-data (data)
+  "Return a list of albums from DATA, a server's response."
+  (mapcar #'libmpdel--create-album-from-data (libmpdel-group-data data)))
+
 (defun libmpdel-current-playlist-p (entity)
   "Return non-nil if ENTITY is the current playlist."
   (eq entity 'current-playlist))
@@ -1003,11 +1021,9 @@ If HANDLER is nil, ignore response."
    "list album"
    (lambda (data)
      (funcall function
-              (mapcar
-               (lambda (album-name)
-                 (libmpdel--album-create :name album-name
-                                         :artist libmpdel--unknown-artist))
-               (libmpdel-sorted-entries data 'Album))))))
+              (seq-uniq
+               (libmpdel--create-albums-from-data data)
+               #'libmpdel-equal)))))
 
 (cl-defmethod libmpdel-list ((_entity (eql genres)) function)
   "Call FUNCTION with all genres as parameter."
@@ -1033,12 +1049,12 @@ If HANDLER is nil, ignore response."
 (cl-defmethod libmpdel-list ((artist libmpdel-artist) function)
   "Call FUNCTION with all albums of ARTIST as parameter."
   (libmpdel-send-command
-   `("list album %s" ,(libmpdel-entity-to-criteria artist))
+   `("find %s sort AlbumSort" ,(libmpdel-entity-to-criteria artist))
    (lambda (data)
      (funcall function
-              (mapcar
-               (lambda (album-name) (libmpdel--album-create :name album-name :artist artist))
-               (libmpdel-sorted-entries data 'Album))))))
+              (seq-uniq
+               (libmpdel--create-albums-from-data data)
+               #'libmpdel-equal)))))
 
 (cl-defgeneric libmpdel-list-songs (entity function)
   "Call FUNCTION with all songs of ENTITY."

test/libmpdel-test.el

@@ -116,6 +116,7 @@
   (let ((song (libmpdel--create-song-from-data
                '((Title . "The song")
                  (file . "foo/song.ogg")
+                 (Date . "1952-08-29")
                  (Album . "The Album")
                  (Performer . "The Violinist")
                  (Performer . "The Pianist")
@@ -125,6 +126,8 @@
     (should (equal "The song" (libmpdel-entity-name song)))
     (should (equal "foo/song.ogg" (libmpdel-song-file song)))
     (should (equal (list "The Genre") (mapcar #'libmpdel-entity-name (libmpdel-genres song))))
+    (should (equal "1952-08-29" (libmpdel-entity-date song)))
+    (should (equal "1952-08-29" (libmpdel-entity-date (libmpdel-album song))))
     (should (equal "The Album" (libmpdel-entity-name (libmpdel-album song))))
     (should (equal (list "The Violinist" "The Pianist" "The Singer")
                    (mapcar #'libmpdel-entity-name (libmpdel-performers song))))