content: misc. changes, groups divided by tracks, relation sections

1 files changed, 23 insertions, 0 deletions

diff --git a/src/content/util/groupTracksByGroup.js b/src/content/util/groupTracksByGroup.js
new file mode 100644
index 00000000..bae2c8c5
--- /dev/null
+++ b/src/content/util/groupTracksByGroup.js
@@ -0,0 +1,23 @@
+import {empty} from '../../util/sugar.js';
+
+export default function groupTracksByGroup(tracks, groups) {
+  const lists = new Map(groups.map(group => [group, []]));
+  lists.set('other', []);
+
+  for (const track of tracks) {
+    const group = groups.find(group => group.albums.includes(track.album));
+    if (group) {
+      lists.get(group).push(track);
+    } else {
+      other.get('other').push(track);
+    }
+  }
+
+  for (const [key, tracks] of lists.entries()) {
+    if (empty(tracks)) {
+      lists.delete(key);
+    }
+  }
+
+  return lists;
+}