Allow to open directories directly

.gitignore

@@ -1,3 +1,4 @@
 *~
 .flatpak-builder
+.flatpak
 build

data/music.desktop.in

@@ -7,7 +7,7 @@ Exec=io.elementary.music %U
 Icon=io.elementary.music
 Terminal=false
 Categories=Audio;Music;Player;AudioVideo;GTK;
-MimeType=x-content/audio-player;x-content/audio-cdda;application/ogg;application/x-extension-m4a;application/x-extension-mp4;application/x-flac;application/x-ogg;audio/3gpp;audio/aac;audio/ac3;audio/AMR;audio/AMR-WB;audio/basic;audio/flac;audio/midi;audio/mp2;audio/mp4;audio/mpeg;audio/ogg;audio/vnd.rn-realaudio;audio/x-aiff;audio/x-ape;audio/x-flac;audio/x-gsm;audio/x-it;audio/x-m4a;audio/x-matroska;audio/x-mod;audio/x-mp3;audio/x-mpeg;audio/x-mpegurl;audio/x-ms-asf;audio/x-ms-asx;audio/x-ms-wax;audio/x-ms-wma;audio/x-musepack;audio/x-opus+ogg;audio/x-pn-aiff;audio/x-pn-au;audio/x-pn-realaudio;audio/x-pn-realaudio-plugin;audio/x-pn-wav;audio/x-pn-windows-acm;audio/x-realaudio;audio/x-real-audio;audio/x-sbc;audio/x-scpls;audio/x-speex;audio/x-tta;audio/x-vorbis;audio/x-vorbis+ogg;audio/x-wav;audio/x-wavpack;audio/x-xm;audio/x-s3m;
+MimeType=x-content/audio-player;x-content/audio-cdda;application/ogg;application/x-extension-m4a;application/x-extension-mp4;application/x-flac;application/x-ogg;audio/3gpp;audio/aac;audio/ac3;audio/AMR;audio/AMR-WB;audio/basic;audio/flac;audio/midi;audio/mp2;audio/mp4;audio/mpeg;audio/ogg;audio/vnd.rn-realaudio;audio/x-aiff;audio/x-ape;audio/x-flac;audio/x-gsm;audio/x-it;audio/x-m4a;audio/x-matroska;audio/x-mod;audio/x-mp3;audio/x-mpeg;audio/x-mpegurl;audio/x-ms-asf;audio/x-ms-asx;audio/x-ms-wax;audio/x-ms-wma;audio/x-musepack;audio/x-opus+ogg;audio/x-pn-aiff;audio/x-pn-au;audio/x-pn-realaudio;audio/x-pn-realaudio-plugin;audio/x-pn-wav;audio/x-pn-windows-acm;audio/x-realaudio;audio/x-real-audio;audio/x-sbc;audio/x-scpls;audio/x-speex;audio/x-tta;audio/x-vorbis;audio/x-vorbis+ogg;audio/x-wav;audio/x-wavpack;audio/x-xm;audio/x-s3m;inode/directory;
 StartupNotify=true
 Keywords=Noise;Audio;Player;MP3;Play;Playlist;Media;Songs;
 X-GNOME-UsesNotifications=true

io.elementary.music.yml

@@ -9,6 +9,7 @@ finish-args:
   - '--socket=wayland'
   - '--socket=pulseaudio'
   - '--device=dri'
+  - '--filesystem=xdg-music:ro'
 
 modules:
   - name: music

src/Application.vala

@@ -103,12 +103,60 @@ public class Music.Application : Gtk.Application {
         settings.bind ("window-maximized", main_window, "maximized", SettingsBindFlags.SET);
     }
 
+    private File[] list_directory (string directory) {
+        Dir dir;
+        try {
+            dir = Dir.open (directory, 0);
+        } catch (FileError e) {
+            warning (e.message);
+            return {};
+        }
+
+        string? name = null;
+        File[] elements = {};
+
+        while ((name = dir.read_name ()) != null) {
+            var file_path = Path.build_filename (directory, name);
+            var file = File.new_for_path (file_path);
+
+            elements += file;
+        }
+
+        return elements;
+    }
+
+    private File[] loop_through_files (File[] files) {
+        // All of these will be returned later in bulk
+        File[] elements = {};
+
+        foreach (var file in files) {
+            var file_path = file.get_path ();
+
+            if (FileUtils.test (file_path, FileTest.IS_DIR)) {
+                var directory_elements = list_directory (file_path);
+                var directory_files = loop_through_files (directory_elements);
+
+                foreach (var directory_file in directory_files) {
+                    elements += directory_file;
+                }
+
+                continue;
+            }
+
+            elements += file;
+        }
+
+        return elements;
+    }
+
     protected override void open (File[] files, string hint) {
         if (active_window == null) {
             activate ();
         }
 
-        playback_manager.queue_files (files);
+        var files_to_play = loop_through_files (files);
+        debug ("Application: Number of files to play %u", files_to_play.length);
+        playback_manager.queue_files (files_to_play);
     }
 
     private void action_play_pause () {

src/PlaybackManager.vala

@@ -83,6 +83,7 @@ public class Music.PlaybackManager : Object {
         playbin.seek_simple (Gst.Format.TIME, Gst.SeekFlags.FLUSH, (int64)(percent * current_audio.duration));
     }
 
+    // Files[] must not contain any null entries
     public void queue_files (File[] files) {
         discoverer.start ();
         int invalids = 0;