Import: DXF, add dedicated import dialog

src/Mod/Import/App/dxf/ImpExpDxf.cpp

@@ -53,6 +53,7 @@
 #include <gp_Vec.hxx>
 #endif
 
+#include <fstream>
 #include <App/Annotation.h>
 #include <App/Application.h>
 #include <App/Document.h>
@@ -80,6 +81,35 @@ using namespace Import;
 using BRepAdaptor_HCurve = BRepAdaptor_Curve;
 #endif
 
+std::map<std::string, int> ImpExpDxfRead::PreScan(const std::string& filepath)
+{
+    std::map<std::string, int> counts;
+    std::ifstream ifs(filepath);
+    if (!ifs) {
+        // Could throw an exception or log an error
+        return counts;
+    }
+
+    std::string line;
+    bool next_is_entity_name = false;
+
+    while (std::getline(ifs, line)) {
+        // Simple trim for Windows-style carriage returns
+        if (!line.empty() && line.back() == '\r') {
+            line.pop_back();
+        }
+
+        if (next_is_entity_name) {
+            // The line after a "  0" group code is the entity type
+            counts[line]++;
+            next_is_entity_name = false;
+        }
+        else if (line == "  0") {
+            next_is_entity_name = true;
+        }
+    }
+    return counts;
+}
 
 //******************************************************************************
 // reading

src/Mod/Import/App/dxf/ImpExpDxf.h

@@ -61,7 +61,7 @@ public:
     {
         Py_XDECREF(DraftModule);
     }
-
+    static std::map<std::string, int> PreScan(const std::string& filepath);
     void StartImport() override;
 
     Py::Object getStatsAsPyObject();

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 {};