Add unused variables delete (#3803)

_unittest/test_09_VariableManager.py

@@ -435,8 +435,9 @@ def test_13_postprocessing(self):
     def test_14_intrinsics(self):
         self.aedtapp["fc"] = "Freq"
         assert self.aedtapp["fc"] == "Freq"
-        assert self.aedtapp.variable_manager.dependent_variables["fc"].numeric_value == 1.0
-        assert self.aedtapp.variable_manager.dependent_variables["fc"].units == "GHz"
+        assert self.aedtapp.variable_manager.dependent_variables["fc"].units == self.aedtapp.odesktop.GetDefaultUnit(
+            "Frequency"
+        )
 
     def test_15_arrays(self):
         self.aedtapp["arr_index"] = 0
@@ -658,3 +659,18 @@ def test_31_test_validator_float_type_invalidate(self, validation_float_input):
         validation_errors = generate_validation_errors(property_names, expected_settings, actual_settings)
 
         assert len(validation_errors) == 1
+
+    def test_32_delete_unused_variables(self):
+        self.aedtapp.insert_design("used_variables")
+        self.aedtapp["used_var"] = "1mm"
+        self.aedtapp["unused_var"] = "1mm"
+        self.aedtapp["$project_used_var"] = "1"
+        self.aedtapp.modeler.create_rectangle(0, ["used_var", "used_var", "used_var"], [10, 20])
+        mat1 = self.aedtapp.materials.add_material("new_copper2")
+        mat1.permittivity = "$project_used_var"
+        assert self.aedtapp.variable_manager.delete_variable("unused_var")
+        self.aedtapp["unused_var"] = "1mm"
+        number_of_variables = len(self.aedtapp.variable_manager.variable_names)
+        assert self.aedtapp.variable_manager.delete_unused_variables()
+        new_number_of_variables = len(self.aedtapp.variable_manager.variable_names)
+        assert number_of_variables != new_number_of_variables

pyaedt/application/Design.py

@@ -3196,6 +3196,17 @@ def delete_variable(self, sVarName):
         """
         return self.variable_manager.delete_variable(sVarName)
 
+    @pyaedt_function_handler()
+    def delete_unused_variables(self):
+        """Delete design and project unused variables.
+
+        Returns
+        -------
+        bool
+            ``True`` when successful, ``False`` when failed.
+        """
+        return self.variable_manager.delete_unused_variables()
+
     @pyaedt_function_handler()
     def insert_design(self, design_name=None, solution_type=None):
         """Add a design of a specified type.

pyaedt/application/Variables.py

@@ -1236,6 +1236,81 @@ def delete_variable(self, var_name):
                 return True
         return False
 
+    @pyaedt_function_handler()
+    def is_used_variable(self, var_name):
+        """Find if a variable is used.
+
+        Parameters
+        ----------
+        var_name : str
+            Name of the variable.
+
+        Returns
+        -------
+        bool
+            ``True`` when successful, ``False`` when failed.
+
+        """
+        used = False
+        # Modeler
+        for obj in self._app.modeler.objects.values():
+            used = self._find_used_variable_history(obj.history(), var_name)
+        if used:
+            self._logger.warning("{} used in modeler.".format(var_name))
+            return used
+
+        # Material
+        for mat in self._app.materials.material_keys.values():
+            for _, v in mat._props.items():
+                if isinstance(v, str) and var_name in re.findall("[$a-zA-Z0-9_]+", v):
+                    used = True
+                    self._logger.warning("{} used in the material: {}.".format(var_name, mat.name))
+                    return used
+        return used
+
+    def _find_used_variable_history(self, history, var_name):
+        """Find if a variable is used.
+
+        Parameters
+        ----------
+        history : :class:`pyaedt.modeler.cad.elements3d.BinaryTree`
+            Object history.
+
+        var_name : str
+            Name of the variable.
+
+        Returns
+        -------
+        bool
+            ``True`` when successful, ``False`` when failed.
+
+        """
+        used = False
+        for _, v in history.props.items():
+            if isinstance(v, str) and var_name in re.findall("[a-zA-Z0-9_]+", v):
+                return True
+        for el in history.children.values():
+            used = self._find_used_variable_history(el, var_name)
+            if used:
+                return True
+        return used
+
+    @pyaedt_function_handler()
+    def delete_unused_variables(self):
+        """Delete unused design and project variables.
+
+        Returns
+        -------
+        bool
+            ``True`` when successful, ``False`` when failed.
+        """
+        var_list = self.variable_names
+
+        for var in var_list[:]:
+            if not self.is_used_variable(var):
+                self.delete_variable(var)
+        return True
+
     @pyaedt_function_handler()
     def _get_var_list_from_aedt(self, desktop_object):
         var_list = []