feat: load the user's mpv.conf

autotests/CMakeLists.txt

@@ -1,4 +1,9 @@
 ecm_add_test(subtitleparsertest.cpp
     TEST_NAME subtitleparsertest
-    LINK_LIBRARIES qtpotato_subtitles Qt6::Test
+    LINK_LIBRARIES qtpotato_core Qt6::Test
+)
+
+ecm_add_test(mpvuserconfigtest.cpp
+    TEST_NAME mpvuserconfigtest
+    LINK_LIBRARIES qtpotato_core Qt6::Test
 )

autotests/mpvuserconfigtest.cpp

@@ -0,0 +1,39 @@
+#include "mpvuserconfig.h"
+
+#include <QTest>
+
+using namespace Qt::Literals::StringLiterals;
+
+class MpvUserConfigTest : public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+    void expandsConfigDirPaths()
+    {
+        const auto prepared = MpvUserConfig::prepare(u"glsl-shaders=\"~~/shaders/a.glsl\"\ninclude=~~home/extra.conf\n"_s, u"/home/me/.config/mpv"_s);
+        QCOMPARE(prepared.content, u"glsl-shaders=\"/home/me/.config/mpv/shaders/a.glsl\"\ninclude=/home/me/.config/mpv/extra.conf\n"_s);
+        QVERIFY(prepared.skippedOptions.isEmpty());
+    }
+
+    void skipsOptionsThatBreakEmbedding()
+    {
+        const QString conf = u"# comment\nvo=gpu-next\nhwdec=auto\n[big]\nno-fs\n--idle=no\n  vo = gpu\nvolume=50\n"_s;
+        const auto prepared = MpvUserConfig::prepare(conf, u"/c"_s);
+        QCOMPARE(prepared.skippedOptions, (QStringList{u"vo"_s, u"fs"_s, u"idle"_s}));
+        QCOMPARE(prepared.content,
+                 u"# comment\n# skipped by QtPotato: vo=gpu-next\nhwdec=auto\n[big]\n# skipped by QtPotato: no-fs\n"
+                 "# skipped by QtPotato: --idle=no\n# skipped by QtPotato:   vo = gpu\nvolume=50\n"_s);
+    }
+
+    void keepsSimilarlyNamedOptions()
+    {
+        // "vo" must not catch "volume" or "vo-..." style options.
+        const auto prepared = MpvUserConfig::prepare(u"volume=70\nvideo-sync=display-resample\nfs-screen=1\n"_s, u"/c"_s);
+        QVERIFY(prepared.skippedOptions.isEmpty());
+    }
+};
+
+QTEST_GUILESS_MAIN(MpvUserConfigTest)
+
+#include "mpvuserconfigtest.moc"