bugfixes (#191)

added basic syntax check; closes #148

Co-authored-by: Dominik Demuth <dominik.demuth@physik.tu-darmstadt.de>
Reviewed-on: #191

src/gui_qt/fit/function_creation_dialog.py

@@ -54,7 +54,7 @@ class QUserFitCreator(QtWidgets.QDialog, Ui_Dialog):
         return self
 
     def update_function(self):
-        prev_text = self.plainTextEdit.toPlainText().split('\n')
+        prev_text = self.editor.toPlainText().split('\n')
         func_body = ''
         in_body = False
         for line in prev_text:
@@ -89,9 +89,12 @@ class QUserFitCreator(QtWidgets.QDialog, Ui_Dialog):
             else:
                 k += f'    def func(x):\n'
 
-            k += func_body
+            if func_body:
+                k += func_body
+            else:
+                k += '        return x'
 
-            self.plainTextEdit.setPlainText(k)
+            self.editor.setPlainText(k)
         except Exception as e:
             QtWidgets.QMessageBox.warning(self, 'Failure', f'Error found: {e.args[0]}')
 
@@ -215,7 +218,7 @@ class KwargsWidget(QtWidgets.QWidget):
         for i in range(self.choices.count()):
             kwargs.append(self.choices.widget(i).get_strings())
         if kwargs:
-            return f"    choices = {', '.join(kwargs)}\n"
+            return f"    choices = [{', '.join(kwargs)}]\n"
         else:
             return ''
 
@@ -475,12 +478,3 @@ class DescWidget(QtWidgets.QWidget):
                   f"    equation = r'{self.eq_lineedit.text()}'\n"
 
         return stringi
-
-
-if __name__ == '__main__':
-    import sys
-    app = QtWidgets.QApplication([])
-    win = QUserFitCreator()
-    win.show()
-
-    sys.exit(app.exec())