Import: DXF, add dedicated import dialog

src/Mod/Import/Gui/AppImportGuiPy.cpp

@@ -94,6 +94,7 @@ public:
         add_keyword_method("insert",
                            &Module::insert,
                            "insert(string,string) -- Insert the file into the given document.");
+        add_varargs_method("preScanDxf", &Module::preScanDxf, "preScanDxf(filepath) -> dict");
         add_varargs_method("readDXF",
                            &Module::readDXF,
                            "readDXF(filename,[document,ignore_errors,option_source]): Imports a "
@@ -112,6 +113,26 @@ public:
     }
 
 private:
+    Py::Object preScanDxf(const Py::Tuple& args)
+    {
+        char* filepath_char = nullptr;
+        if (!PyArg_ParseTuple(args.ptr(), "et", "utf-8", &filepath_char)) {
+            throw Py::Exception();
+        }
+        std::string filepath(filepath_char);
+        PyMem_Free(filepath_char);
+
+#include <Mod/Import/App/dxf/ImpExpDxf.h>
+
+        std::map<std::string, int> counts = Import::ImpExpDxfRead::PreScan(filepath);
+
+        Py::Dict result;
+        for (const auto& pair : counts) {
+            result.setItem(Py::String(pair.first), Py::Long(pair.second));
+        }
+        return result;
+    }
+
     Py::Object importOptions(const Py::Tuple& args)
     {
         char* Name {};