Fixed FileSystemHelper warning

apps/sandbox/CMakeLists.txt

+waLBerla_link_files_to_builddir( *.dat )
+
 # Sandbox
 waLBerla_add_executable(
    NAME Sandbox

apps/sandbox/sandbox.cpp

@@ -53,7 +53,7 @@ int main( int argc, char ** argv )
    generator::registerAll();
 
    const auto simConfig = config->getOneBlock( "SimulationSetup" );
-   const uint_t timesteps = simConfig.getParameter<uint_t>( "timesteps" );
+   const uint_t timesteps = simConfig.getParameter<uint_t>( "timeSteps" );
 
    peSetup_T peSetup( *config );
 

apps/sandbox/sandbox.dat

@@ -7,7 +7,7 @@ DomainSetup
 
 SimulationSetup
 {
-   timesteps 2001;
+   timeSteps 2001;
 }
 
 pe
@@ -55,11 +55,11 @@ pe
       {
          position      <250, 250, 250>;
          lengths       < 1,  1,  1>;
-         userId        100; # [OPTIONAL]
-         material      bodyMaterial; # [OPTIONAL]
-         global        off; # [OPTIONAL]
-         communicating on; # [OPTIONAL]
-         infiniteMass  off; # [OPTIONAL]
+         userId        100;          // [OPTIONAL]
+         material      bodyMaterial; // [OPTIONAL]
+         global        off;          // [OPTIONAL]
+         communicating on;           // [OPTIONAL]
+         infiniteMass  off;          // [OPTIONAL]
       }*/
 
       /*Capsule
@@ -67,32 +67,33 @@ pe
          position      <250, 250, 250>;
          radius        0.5;
          length        2;
-         userId        100; # [OPTIONAL]
-         material      bodyMaterial; # [OPTIONAL]
-         global        off; # [OPTIONAL]
-         communicating on; # [OPTIONAL]
-         infiniteMass  off; # [OPTIONAL]
+         userId        100;          // [OPTIONAL]
+         material      bodyMaterial; // [OPTIONAL]
+         global        off;          // [OPTIONAL]
+         communicating on;           // [OPTIONAL]
+         infiniteMass  off;          // [OPTIONAL]
       }*/
 
       /*CylindricalBoundary
       {
          position <250, 250, 0>;
          radius   250;
-         userId   100; # [OPTIONAL]
-         material bodyMaterial; # [OPTIONAL]
+         userId   100;          // [OPTIONAL]
+         material bodyMaterial; // [OPTIONAL]
       }*/
 
       /*Ellipsoid
       {
          position      <250, 250, 250>;
          semiAxes      < 1,  1,  1>;
-         userId        100; # [OPTIONAL]
-         material      bodyMaterial; # [OPTIONAL]
-         global        off; # [OPTIONAL]
-         communicating on; # [OPTIONAL]
-         infiniteMass  off; # [OPTIONAL]
+         userId        100;          // [OPTIONAL]
+         material      bodyMaterial; // [OPTIONAL]
+         global        off;          // [OPTIONAL]
+         communicating on;           // [OPTIONAL]
+         infiniteMass  off;          // [OPTIONAL]
       }*/
 
+      /** Add a bottom plane **/
       Plane
       {
          position <250, 250, 0>;
@@ -104,11 +105,11 @@ pe
       {
          position      <250, 250, 250>;
          radius        5;
-         userId        100;          # [OPTIONAL]
-         material      bodyMaterial; # [OPTIONAL]
-         global        false;        # [OPTIONAL]
-         communicating on;           # [OPTIONAL]
-         infiniteMass  on;           # [OPTIONAL]
+         userId        100;          // [OPTIONAL]
+         material      bodyMaterial; // [OPTIONAL]
+         global        false;        // [OPTIONAL]
+         communicating on;           // [OPTIONAL]
+         infiniteMass  on;           // [OPTIONAL]
       }*/
 
       /*Squirmer
@@ -117,11 +118,11 @@ pe
          radius        5;
          velocity      0.1;
          beta          0.01;
-         userId        100;          # [OPTIONAL]
-         material      bodyMaterial; # [OPTIONAL]
-         global        false;        # [OPTIONAL]
-         communicating on;           # [OPTIONAL]
-         infiniteMass  on;           # [OPTIONAL]
+         userId        100;          // [OPTIONAL]
+         material      bodyMaterial; // [OPTIONAL]
+         global        false;        // [OPTIONAL]
+         communicating on;           // [OPTIONAL]
+         infiniteMass  on;           // [OPTIONAL]
       }*/
    }
 
@@ -129,7 +130,7 @@ pe
    {
       /*ConfigFileImport
       {
-         identifer  configImport;
+         identifier  configImport;
          execution  <0, 1, 0>;
          initTime   0;
 
@@ -141,7 +142,7 @@ pe
       {
          /*EllipsoidSource
          {
-            execution <0, 100, $(timesteps)>;
+            execution <0, 100, 1000>;
             numBodies -1;
 
             Material { value bodyMaterial; }
@@ -159,8 +160,8 @@ pe
             Position
             {
                type cartesianGrid;
-               aabb [<0.2, 0.2, 0.8>, <0.8, 0.8, 1.0>];
-               spacing 0.2;
+               aabb [<0.0, 0.0, 480>, <500, 500, 490>];
+               spacing 10.0;
             }
 
             AngularVelocity
@@ -183,9 +184,17 @@ pe
 
             Radius
             {
-               type logNormalDistribution;
-               mean 5.0;
-               sigma 1.2;
+               type transform;
+               // transform volume to radius
+               expression root(3.0 * value / (4.0 * PI), 3);
+
+               /** Generate log-normal distributed sphere volumes **/
+               Value
+               {
+                  type logNormalDistribution;
+                  mean 500; // -> R ~ 5
+                  sigma 1.2;
+               }
             }
 
             Position
@@ -230,7 +239,7 @@ pe
       {
          identifier                 volumeFractionMapping;
          execution                  <2000, 1, 2000>;
-         //initTime                   0;
+         initTime                   0;
 
          fieldId                    volumeFractionField;
          initValue                  0;
@@ -238,7 +247,7 @@ pe
          synchronize                off;
 
          fractionType               solid; // "solid" or "void"
-         //domain                     [<min>, <max>];
+         domain                     [<0.0, 0.0, 0.0>, <500.0, 500.0, 500.0>];
 
          BodyFilter { All { } }
 

src/sandbox/core/io/FileSystemHelper.cpp

@@ -55,11 +55,15 @@ std::vector<filesystem::path> getFilePathsFromRegex( const std::string & regex )
          if( !std::regex_match( i->path().filename().string(), filter ) )
             continue;
 
+         // only store FILE paths that match the expression
          paths.push_back( i->path() );
       }
-   } catch( std::regex_error ) {
-      // input is not a regex, so there is only one file
-      paths.push_back( absPath );
+   } catch( std::regex_error & ) {
+      // input is just a file path
+      if( filesystem::is_regular_file( absPath ) )
+         paths.push_back( absPath );
+      else
+         throw std::runtime_error( "Invalid file path or regex: " + absPath.string() );
    }
 
    return paths;