feat: config object migration path and add new options to settings

Plugins/ZShell/Config/migration.cpp

@@ -0,0 +1,123 @@
+#include "migration.hpp"
+
+#include <QDebug>
+
+namespace ZShell::config {
+
+namespace {
+
+// A stored value is "missing" if the path does not resolve to an entry.
+// Note: default-constructed QJsonValue is Null, not Undefined.
+bool isMissing(const QJsonValue& v) {
+	return v.isUndefined() || v.isNull();
+}
+
+QJsonValue valueAt(const QJsonObject& obj, const QStringList& path) {
+	QJsonObject cur = obj;
+
+	for (int i = 0; i < path.size() - 1; ++i) {
+		if (!cur.value(path.at(i)).isObject()) return QJsonValue::Undefined;
+		cur = cur.value(path.at(i)).toObject();
+	}
+
+	const QString key = path.last();
+	if (!cur.contains(key)) return QJsonValue::Undefined;
+	return cur.value(key);
+}
+
+QJsonObject placeAt(QJsonObject obj, QStringList path, const QJsonValue& value) {
+	const QString head = path.takeFirst();
+
+	if (path.isEmpty()) {
+		obj[head] = value;
+		return obj;
+	}
+
+	QJsonObject child = obj.value(head).isObject() ? obj.value(head).toObject()
+												   : QJsonObject();
+	obj[head] = placeAt(child, path, value);
+	return obj;
+}
+
+// Removes `path` from `obj`. Returns true if a value was removed.
+// Parent objects left empty are removed as well.
+bool removeAt(QJsonObject& obj, const QStringList& path) {
+	const QString head = path.first();
+
+	if (path.size() == 1) {
+		if (!obj.contains(head)) return false;
+		obj.remove(head);
+		return true;
+	}
+
+	if (!obj.value(head).isObject()) return false;
+
+	QJsonObject child = obj.value(head).toObject();
+	const bool removed = removeAt(child, path.mid(1));
+
+	if (child.isEmpty())
+		obj.remove(head);
+	else
+		obj[head] = child;
+
+	return removed;
+}
+
+} // namespace
+
+const QList<ConfigMigrationRule>& ConfigMigrations::rules() {
+	static const QList<ConfigMigrationRule> s_rules = {
+		migrate(
+			"general.color.scheduleHyprsunset", "display.nightlight.schedule"),
+		migrate(
+			"general.color.scheduleHyprsunsetStart",
+			"display.nightlight.scheduleStart"),
+		migrate(
+			"general.color.scheduleHyprsunsetEnd",
+			"display.nightlight.scheduleEnd"),
+		migrate("general.color.scheduleDark", "colors.scheduleDark"),
+		migrate("general.color.scheduleDarkStart", "colors.scheduleDarkStart"),
+		migrate("general.color.scheduleDarkEnd", "colors.scheduleDarkEnd"),
+		migrate("general.color.schemeGeneration", "colors.schemeGen"),
+		migrate(
+			"general.color.useNativeNightlight",
+			"display.nightlight.useNative"),
+		migrate(
+			"general.color.nativeFadeDuration",
+			"display.nightlight.fadeDuration"),
+		migrate("general.color.hyprsunsetTemp", "display.nightlight.temp"),
+		migrate("general.color.neovimColors", "colors.neovimColors"),
+		migrate("general.color.mode", "colors.mode"),
+		migrate("general.color.smart", "colors.smart"),
+	};
+	return s_rules;
+}
+
+QJsonObject ConfigMigrations::apply(const QJsonObject& json) {
+	QJsonObject obj = json;
+
+	for (const auto& rule : rules()) {
+		const QStringList from =
+			rule.from.split(QLatin1Char('.'), Qt::SkipEmptyParts);
+		const QStringList to =
+			rule.to.split(QLatin1Char('.'), Qt::SkipEmptyParts);
+
+		if (from.isEmpty() || to.isEmpty()) continue;
+
+		const QJsonValue oldValue = valueAt(obj, from);
+		if (isMissing(oldValue)) continue;
+
+		const bool targetExists = !isMissing(valueAt(obj, to));
+		if (!targetExists) obj = placeAt(obj, to, oldValue);
+
+		if (removeAt(obj, from)) {
+			qInfo() << "Config migration:" << rule.from << "->" << rule.to
+					<< (targetExists ? "(target already set, old value dropped)"
+									 : "(value moved)");
+		}
+	}
+
+	return obj;
+}
+
+} // namespace ZShell::config