Merge branch 'The-track-file-name-update' into 'master'

The tracks output file name update

See merge request !165

FullSimLight/Plugins/TracksPlugin/src/TrksRunAction.cc

 #include "TrksRunAction.h"
 #include "TrksHDF5Factory.h"
 
+#include <string>
+#include <filesystem>
+#include <set>
+
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
 std::map<G4int, G4int> TrksRunAction::fgTrkNums;
@@ -26,8 +30,37 @@ void TrksRunAction::BeginOfRunAction(const G4Run* /*aRun*/)
 {
     if  (IsMaster())
     {
+        using namespace std;
+        namespace fs = std::filesystem;
+
+        set<string> fileNames;
+        string outputFileName; 
+
+        fs::path pwdPath = fs::current_path();
+        for (const auto & entry : fs::directory_iterator(pwdPath))
+        {
+            fileNames.insert(entry.path());
+        }
+
+        for (int i=0; true; ++i)
+        {
+            outputFileName = "Tracks_data";
+            outputFileName += i == 0 ? "" : string("_") + to_string(i);
+            outputFileName+=".h5";
+
+            if (fileNames.find( string(pwdPath) + "/" + outputFileName) == fileNames.end())
+            {
+
+                break;
+            }
+
+            cout << "A file " << outputFileName << " already exists in the working directory. " 
+                 << "Looking for another file name.\n";
+        }
+
+
         TrksHDF5Factory* hdf5Factory = TrksHDF5Factory::GetInstance();
-        hdf5Factory->OpenFile("Tracks_data.h5");
+        hdf5Factory->OpenFile(outputFileName.c_str());
     }
 }
 
@@ -60,7 +93,11 @@ void TrksRunAction::EndOfRunAction(const G4Run* /*aRun*/)
 
         delete dataSet;
 
+        G4String outputFileName = file->getFileName();
+
         file->close();
+
+        G4cout << "The file " << outputFileName << " has been created." << G4endl;
     }
 }