Ref T103, verify important files/directories

* utility function in CDirectoryUtils
* deployed in main/application

src/blackmisc/directoryutils.cpp

@@ -327,6 +327,34 @@ namespace BlackMisc
         return dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot | QDir::NoSymLinks);
     }
 
+    QStringList CDirectoryUtils::verifyRuntimeDirectoriesAndFiles()
+    {
+        QStringList failed;
+        QDir d(CDirectoryUtils::binDirectory());
+        if (!d.isReadable()) { failed.append(d.absolutePath()); }
+
+        d = QDir(CDirectoryUtils::imagesDirectory());
+        if (!d.isReadable()) { failed.append(d.absolutePath()); }
+
+        d = QDir(CDirectoryUtils::stylesheetsDirectory());
+        if (!d.isReadable()) { failed.append(d.absolutePath()); }
+
+        d = QDir(CDirectoryUtils::applicationDataDirectory());
+        if (!d.isReadable()) { failed.append(d.absolutePath()); }
+
+        // check if the executables are avialable
+        QString fn = CDirectoryUtils::executableFilePath(CBuildConfig::swiftCoreExecutableName());
+        if (!QFile::exists(fn)) { failed.append(fn); }
+
+        fn = CDirectoryUtils::executableFilePath(CBuildConfig::swiftDataExecutableName());
+        if (!QFile::exists(fn)) { failed.append(fn); }
+
+        fn = CDirectoryUtils::executableFilePath(CBuildConfig::swiftGuiExecutableName());
+        if (!QFile::exists(fn)) { failed.append(fn); }
+
+        return failed;
+    }
+
     QSet<QString> CDirectoryUtils::fileNamesToQSet(const QFileInfoList &fileInfoList)
     {
         QSet<QString> sl;

src/blackmisc/directoryutils.h

@@ -100,7 +100,7 @@ namespace BlackMisc
         //! \remark In BlackMisc so it can also be used from BlackMisc classes
         static const QString &logDirectory();
 
-        //! Directory for log files
+        //! Directory for crashpad files
         static const QString &crashpadDirectory();
 
         //! Virtually the inverse operation of CDirectoryUtils::normalizedApplicationDirectory
@@ -109,6 +109,9 @@ namespace BlackMisc
         //! All sub directories of given dir
         static QStringList getSubDirectories(const QString &rootDir);
 
+        //! Check if the (most important) runtime directories are available
+        static QStringList verifyRuntimeDirectoriesAndFiles();
+
         //! Result of directory comparison
         struct DirComparison
         {