Add setting for lyric providers and add more providers

Fixes #335

src/lyrics/lyricsproviders.cpp

@@ -21,13 +21,20 @@
 
 #include <QObject>
 #include <QMutex>
+#include <QList>
+#include <QVariant>
+#include <QVariantList>
 #include <QString>
+#include <QStringList>
+#include <QSettings>
 #include <QtDebug>
 
 #include "core/logging.h"
 #include "lyricsprovider.h"
 #include "lyricsproviders.h"
 
+#include "settings/lyricssettingspage.h"
+
 LyricsProviders::LyricsProviders(QObject *parent) : QObject(parent) {}
 
 LyricsProviders::~LyricsProviders() {
@@ -38,6 +45,48 @@ LyricsProviders::~LyricsProviders() {
 
 }
 
+void LyricsProviders::ReloadSettings() {
+
+  QStringList all_providers;
+  for (LyricsProvider *provider : lyrics_providers_.keys()) {
+    if (!provider->is_enabled()) continue;
+    all_providers << provider->name();
+  }
+
+  QSettings s;
+  s.beginGroup(LyricsSettingsPage::kSettingsGroup);
+  QStringList providers_enabled = s.value("providers", all_providers).toStringList();
+  s.endGroup();
+
+  int i = 0;
+  QList<LyricsProvider*> providers;
+  for (const QString &name : providers_enabled) {
+    LyricsProvider *provider = ProviderByName(name);
+    if (provider) {
+      provider->set_enabled(true);
+      provider->set_order(++i);
+      providers << provider;
+    }
+  }
+
+  for (LyricsProvider *provider : lyrics_providers_.keys()) {
+    if (!providers.contains(provider)) {
+      provider->set_enabled(false);
+      provider->set_order(++i);
+    }
+  }
+
+}
+
+LyricsProvider *LyricsProviders::ProviderByName(const QString &name) const {
+
+  for (LyricsProvider *provider : lyrics_providers_.keys()) {
+    if (provider->name() == name) return provider;
+  }
+  return nullptr;
+
+}
+
 void LyricsProviders::AddProvider(LyricsProvider *provider) {
 
   {