initial commit

src/Config.cpp

@@ -0,0 +1,48 @@
+#include "Config.h"
+#include <QDir>
+#include <QFile>
+#include <QStandardPaths>
+
+QString Config::escape(const QString &s) {
+    return QString(s).replace("\\","\\\\").replace("\"","\\\"");
+}
+QString Config::unescape(const QString &s) {
+    return QString(s).replace("\\\\","\\").replace("\\\"","\"").replace("\\/","/");
+}
+
+QString Config::extractString(const QString &json, const QString &key) {
+    QString needle = "\"" + key + "\"";
+    int ki = json.indexOf(needle);
+    if (ki < 0) return {};
+    int colon = json.indexOf(':', ki + needle.size());
+    if (colon < 0) return {};
+    int open = json.indexOf('"', colon + 1);
+    if (open < 0) return {};
+    int close = open + 1;
+    while (close < json.size()) {
+        if (json[close] == '\\') { close += 2; continue; }
+        if (json[close] == '"')  break;
+        ++close;
+    }
+    if (close >= json.size()) return {};
+    return unescape(json.mid(open + 1, close - open - 1));
+}
+
+QString Config::loadMusicRoot() {
+    QFile f(configFile());
+    if (f.open(QIODevice::ReadOnly)) {
+        QString json = QString::fromUtf8(f.readAll());
+        QString path = extractString(json, "musicRoot");
+        if (!path.isEmpty() && QDir(path).exists()) return path;
+    }
+    QString music = QStandardPaths::writableLocation(QStandardPaths::MusicLocation);
+    return music.isEmpty() ? QDir::homePath() : music;
+}
+
+void Config::saveMusicRoot(const QString &root) {
+    QDir().mkpath(configDir());
+    QFile f(configFile());
+    if (f.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
+        f.write(("{\n  \"musicRoot\": \"" + escape(root) + "\"\n}\n").toUtf8());
+    }
+}