ENH: Add translation for VolumeDisplayPresets.json

See Slicer/SlicerLanguagePacks#43

Co-authored-by: Andras Lasso <lasso@queensu.ca>

Modules/Loadable/Volumes/Logic/vtkSlicerVolumesLogic.cxx

@@ -20,6 +20,7 @@
 #include "vtkSlicerVolumesLogic.h"
 
 // MRML logic includes
+#include "vtkMRMLI18N.h"
 #include "vtkMRMLColorLogic.h"
 #include "vtkDataIOManagerLogic.h"
 #include "vtkMRMLRemoteIOLogic.h"
@@ -1658,7 +1659,7 @@ void vtkSlicerVolumesLogic::InitializeDefaultVolumeDisplayPresets()
     }
     VolumeDisplayPreset presetObj;
     presetObj.id = preset["id"].GetString();
-    presetObj.name = preset["name"].GetString();
+    presetObj.name = vtkMRMLTr("VolumeDisplayPresets", preset["name"].GetString());
     presetObj.level = preset["level"].GetDouble();
     presetObj.window = preset["window"].GetDouble();
     presetObj.valid = true;
@@ -1682,7 +1683,7 @@ void vtkSlicerVolumesLogic::InitializeDefaultVolumeDisplayPresets()
     {
       if (preset["description"].IsString())
       {
-        presetObj.description = preset["description"].GetString();
+        presetObj.description = vtkMRMLTr("VolumeDisplayPresets", preset["description"].GetString());
       }
       else
       {

Utilities/Scripts/update_translations.py

@@ -356,6 +356,57 @@ def extract_translatable_from_cli_modules(input_paths, exclude_filenames=None):
                     _generate_translation_header_from_cli_xml(os.path.join(root, name))
 
 
+def _get_string_values_from_json(data, keys):
+    """Get all string values from a JSON object that matches any of the the specified keys"""
+    values = []
+    if isinstance(data, dict):
+        for key, value in data.items():
+            if isinstance(value, (dict, list)):
+                values.extend(_get_string_values_from_json(value, keys))
+            elif isinstance(value, str) and key in keys:
+                values.append(value)
+    elif isinstance(data, list):
+        for item in data:
+            values.extend(_get_string_values_from_json(item, keys))
+    return values
+
+def _generate_translation_header_from_json_file(filename, property_names):
+    """Generate a C++ header file from translatable properties found in a json file"""
+    logging.debug(f"Generating header file for Qt translation from {filename}")
+
+    file_path = os.path.abspath(filename)
+    if not os.path.isfile(file_path):
+        raise RuntimeError(f"Failed to extract translatable strings, file not found: {filename}")
+
+    with open(file_path, encoding="utf8") as file:
+        import json
+
+        try:
+            json_object = json.loads(file.read())
+        except json.decoder.JSONDecodeError:
+            raise RuntimeError(f"Failed to extract translatable strings, not a valid JSON file: {filename}")
+
+        translation_context = os.path.splitext(os.path.basename(filename))[0]
+
+        cpp_header_str = f"// Generated automatically by update_translations.py from {filename}\n\n"
+
+        translatable_strings = _get_string_values_from_json(json_object, property_names)
+
+        # Get unique strings with keeping the order
+        seen = set()
+        translatable_strings = [x for x in translatable_strings if x not in seen and not seen.add(x)]
+
+        for translatable_string in translatable_strings:
+            translatable_string = translatable_string.replace("\n", "\\n").replace('"', '\\"')
+            cpp_header_str += f'QT_TRANSLATE_NOOP("{translation_context}", "{translatable_string}")\n'
+
+        cpp_header_path = os.path.splitext(filename)[0] + "_tr.h"
+
+        logging.info("Writing output file: " + cpp_header_path)
+        with open(cpp_header_path, "w", encoding="utf8") as cpp_header_file:
+            cpp_header_file.write(cpp_header_str)
+
+
 def main(argv):
     parser = argparse.ArgumentParser(description="Update Qt translation files")
     parser.add_argument("--lupdate", default="lupdate", dest="lupdate_path",
@@ -405,6 +456,11 @@ def main(argv):
             "DiffusionTensorTest.xml",
         ]
         extract_translatable_from_cli_modules(cli_input_paths, cli_exclude_names)
+
+        # Slicer presets files translation
+        _generate_translation_header_from_json_file(
+            os.path.join(args.source_code_dir, "Modules/Loadable/Volumes/Resources/VolumeDisplayPresets.json"),
+            ["name", "description"])
     else:
         extract_translatable_from_cli_modules([args.source_code_dir])