added patfname command to save the file the last pttern was loaded from (#770)

* added patfname command to save the file the last pttern was loaded from

python/slsdet/detector.py

@@ -3412,6 +3412,13 @@ class Detector(CppDetectorApi):
         fname = ut.make_string_path(fname)
         ut.set_using_dict(self.setPattern, fname)
 
+    @property
+    def patfname(self):
+        """
+        [Ctb][Mythen3] Gets the pattern file name including path of the last pattern uploaded. Returns an empty if nothing was uploaded or via a server default
+        file
+        """
+        return self.getPatterFileName()
 
     @property
     @element

python/src/detector.cpp

@@ -1737,6 +1737,11 @@ void init_det(py::module &m) {
                        (std::string(Detector::*)(const defs::dacIndex) const) &
                            Detector::getSlowAdcName,
                        py::arg());
+    CppDetectorApi.def(
+        "getPatterFileName",
+        (Result<std::string>(Detector::*)(sls::Positions) const) &
+            Detector::getPatterFileName,
+        py::arg() = Positions{});
     CppDetectorApi.def(
         "setPattern",
         (void (Detector::*)(const std::string &, sls::Positions)) &