feat: add playlist, recent files and MPRIS backends

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

autotests/playlistmodeltest.cpp

@@ -0,0 +1,105 @@
+// SPDX-FileCopyrightText: 2026 Tri Vo Khac
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "playlistmodel.h"
+
+#include <QFile>
+#include <QSignalSpy>
+#include <QTemporaryDir>
+#include <QTest>
+
+using namespace Qt::Literals::StringLiterals;
+
+class PlaylistModelTest : public QObject
+{
+    Q_OBJECT
+
+private:
+    static void touch(const QTemporaryDir &dir, const QString &name)
+    {
+        QFile file(dir.filePath(name));
+        QVERIFY(file.open(QIODevice::WriteOnly));
+    }
+
+    static QStringList names(const PlaylistModel &model)
+    {
+        QStringList result;
+        for (int i = 0; i < model.rowCount(); ++i) {
+            result.append(model.data(model.index(i), PlaylistModel::NameRole).toString());
+        }
+        return result;
+    }
+
+private Q_SLOTS:
+    void sortsEpisodesNaturallyAndSkipsOtherFiles()
+    {
+        QTemporaryDir dir;
+        for (const QString &name : {u"Show - 10.mkv"_s, u"show - 2.mkv"_s, u"Show - 1.mkv"_s, u"notes.txt"_s, u"Show - 1.srt"_s, u"theme.mp3"_s}) {
+            touch(dir, name);
+        }
+
+        const QList<QUrl> urls = PlaylistModel::mediaFilesIn(dir.path());
+        QStringList fileNames;
+        for (const QUrl &url : urls) {
+            fileNames.append(url.fileName());
+        }
+        QCOMPARE(fileNames, (QStringList{u"Show - 1.mkv"_s, u"show - 2.mkv"_s, u"Show - 10.mkv"_s, u"theme.mp3"_s}));
+    }
+
+    void openFileLoadsSiblingsAndPlaysTheFile()
+    {
+        QTemporaryDir dir;
+        for (const QString &name : {u"Ep 1.mkv"_s, u"Ep 2.mkv"_s, u"Ep 3.mkv"_s}) {
+            touch(dir, name);
+        }
+
+        PlaylistModel model;
+        QSignalSpy played(&model, &PlaylistModel::playRequested);
+        const QUrl second = QUrl::fromLocalFile(dir.filePath(u"Ep 2.mkv"_s));
+        model.openFile(second, true);
+
+        QCOMPARE(names(model), (QStringList{u"Ep 1.mkv"_s, u"Ep 2.mkv"_s, u"Ep 3.mkv"_s}));
+        QCOMPARE(model.playingIndex(), 1);
+        QCOMPARE(played.count(), 1);
+        QCOMPARE(played.first().first().toUrl(), second);
+
+        model.openFile(second, false);
+        QCOMPARE(names(model), (QStringList{u"Ep 2.mkv"_s}));
+    }
+
+    void nextAndPreviousStopAtTheEndsUnlessWrapping()
+    {
+        PlaylistModel model;
+        model.append({QUrl(u"https://example.com/a"_s), QUrl(u"https://example.com/b"_s)});
+        model.play(1);
+
+        QVERIFY(!model.playNext());
+        QCOMPARE(model.playingIndex(), 1);
+        QVERIFY(model.playNext(true));
+        QCOMPARE(model.playingIndex(), 0);
+        QVERIFY(!model.playPrevious());
+        QVERIFY(model.playPrevious(true));
+        QCOMPARE(model.playingIndex(), 1);
+    }
+
+    void playingIndexFollowsRemoveAndMove()
+    {
+        PlaylistModel model;
+        model.append({QUrl(u"https://example.com/a"_s), QUrl(u"https://example.com/b"_s), QUrl(u"https://example.com/c"_s)});
+        model.play(1);
+
+        model.move(1, 2);
+        QCOMPARE(model.playingIndex(), 2);
+        model.move(0, 2);
+        QCOMPARE(model.playingIndex(), 1);
+        model.remove(0);
+        QCOMPARE(model.playingIndex(), 0);
+        model.remove(0);
+        QCOMPARE(model.playingIndex(), -1);
+        QCOMPARE(model.count(), 1);
+    }
+};
+
+QTEST_GUILESS_MAIN(PlaylistModelTest)
+
+#include "playlistmodeltest.moc"