First tries on a portable version.

src/core/application.cpp

@@ -44,6 +44,8 @@
 # include "moodbar/moodbarloader.h"
 #endif
 
+bool Application::kIsPortable = false;
+
 Application::Application(QObject* parent)
   : QObject(parent),
     tag_reader_client_(NULL),

src/core/application.h

@@ -52,6 +52,8 @@ class Application : public QObject {
   Q_OBJECT
 
 public:
+  static bool kIsPortable;
+
   Application(QObject* parent = NULL);
   ~Application();
 

src/core/song.cpp

@@ -19,6 +19,7 @@
 
 #include <algorithm>
 
+#include <QCoreApplication>
 #include <QFile>
 #include <QFileInfo>
 #include <QLatin1Literal>
@@ -258,8 +259,15 @@ qint64 Song::length_nanosec() const { return d->end_ - d->beginning_; }
 int Song::bitrate() const { return d->bitrate_; }
 int Song::samplerate() const { return d->samplerate_; }
 int Song::directory_id() const { return d->directory_id_; }
-const QUrl& Song::url() const { return d->url_; }
-const QString& Song::basefilename() const { return d->basefilename_; }
+const QUrl& Song::url() const {
+  QUrl base = QUrl::fromLocalFile(QCoreApplication::applicationDirPath());
+  qLog(Debug) << "Url" << d->url_.toLocalFile();
+  qLog(Debug) << "base" << base.toString();
+  qLog(Debug) << "absolute" << base.resolved(d->url_).toString();
+  QUrl res = base.resolved(d->url_);
+  return d->url_;
+}
+const QString& Song::basefilename() const {  return d->basefilename_; }
 uint Song::mtime() const { return d->mtime_; }
 uint Song::ctime() const { return d->ctime_; }
 int Song::filesize() const { return d->filesize_; }

src/core/utilities.cpp

@@ -37,6 +37,7 @@
 #include <QWidget>
 #include <QXmlStreamReader>
 
+#include "core/application.h"
 #include "core/logging.h"
 #include "timeconstants.h"
 
@@ -298,6 +299,9 @@ QString ColorToRgba(const QColor& c) {
 QString GetConfigPath(ConfigPath config) {
   switch (config) {
     case Path_Root: {
+      if (Application::kIsPortable) {
+        return QString("%1/data").arg(QCoreApplication::applicationDirPath());
+      }
       #ifdef Q_OS_DARWIN
         return mac::GetApplicationSupportPath() + "/" + QCoreApplication::organizationName();
       #else
@@ -307,6 +311,9 @@ QString GetConfigPath(ConfigPath config) {
     break;
 
     case Path_CacheRoot: {
+      if (Application::kIsPortable) {
+        return GetConfigPath(Path_Root) + "/cache";
+      }
       #if defined(Q_OS_UNIX) && !defined(Q_OS_DARWIN)
         char* xdg = getenv("XDG_CACHE_HOME");
         if (!xdg || !*xdg) {

src/library/librarybackend.cpp

@@ -190,7 +190,7 @@ void LibraryBackend::UpdateTotalSongCount() {
 }
 
 void LibraryBackend::AddDirectory(const QString& path) {
-  QString canonical_path = QFileInfo(path).canonicalFilePath();
+  QString canonical_path = path; //QFileInfo(path).canonicalFilePath();
 
   QMutexLocker l(db_->Mutex());
   QSqlDatabase db(db_->Connect());

src/library/librarysettingspage.cpp

@@ -68,7 +68,14 @@ void LibrarySettingsPage::Add() {
   path = QFileDialog::getExistingDirectory(this, tr("Add directory..."), path);
 
   if (!path.isNull()) {
-    dialog()->library_directory_model()->AddDirectory(path);
+    if (Application::kIsPortable) {
+      QDir appPath(QCoreApplication::applicationDirPath());
+      QString relativePath = appPath.relativeFilePath(path);
+      qLog(Debug) << "Relative Path" << relativePath;
+      dialog()->library_directory_model()->AddDirectory(relativePath);
+    } else {
+      dialog()->library_directory_model()->AddDirectory(path);
+    }
   }
 
   settings.setValue("last_path", path);

src/main.cpp

@@ -225,6 +225,18 @@ void ParseAProto() {
   message.ParseFromArray(data.constData(), data.size());
 }
 
+void CheckPortable() {
+  QFile f(QApplication::applicationDirPath() + QDir::separator() + "data");
+  qLog(Debug) << f.fileName();
+  if (f.exists()) {
+    // We are portable. Set the bool and change the qsettings path
+    Application::kIsPortable = true;
+
+    QSettings::setDefaultFormat(QSettings::IniFormat);
+    QSettings::setPath(QSettings::IniFormat, QSettings::UserScope, f.fileName());
+  }
+}
+
 int main(int argc, char *argv[]) {
   if (CrashReporting::SendCrashReport(argc, argv)) {
     return 0;
@@ -306,6 +318,8 @@ int main(int argc, char *argv[]) {
 
   QtSingleApplication a(argc, argv);
 
+  CheckPortable();
+
   // A bug in Qt means the wheel_scroll_lines setting gets ignored and replaced
   // with the default value of 3 in QApplicationPrivate::initialize.
   {

src/networkremote/remoteclient.cpp

@@ -50,7 +50,6 @@ RemoteClient::RemoteClient(Application* app, QTcpSocket* client)
   authenticated_ = !use_auth_code_;
 }
 
-
 RemoteClient::~RemoteClient() {
   client_->close();
   if (client_->state() == QAbstractSocket::ConnectedState)