Various fixes, cleanup and improvements to i18n module.

* Remove multi-processing in messages class update, was no giving much
  speedup if any at all.
* Remove some debug prints.
* Make messages class pickleable.

* Filter better actual setting values from Settings class.
* Make settings pickleable.

All this will allow to use multi-processing in the i18n addon itself.

release/scripts/modules/bl_i18n_utils/settings.py

@@ -28,6 +28,7 @@
 import json
 import os
 import sys
+import types
 
 import bpy
 
@@ -556,6 +557,10 @@ def _gen_get_set_path(ref, name):
     return _get, _set
 
 
+def _check_valid_data(uid, val):
+    return not uid.startswith("_") and type(val) not in tuple(types.__dict__.values()) + (type,)
+
+
 class I18nSettings:
     """
     Class allowing persistence of our settings!
@@ -567,20 +572,32 @@ class I18nSettings:
         # Addon preferences are singleton by definition, so is this class!
         if not I18nSettings._settings:
             cls._settings = super(I18nSettings, cls).__new__(cls)
-            cls._settings.__dict__ = {uid: data for uid, data in globals().items() if not uid.startswith("_")}
+            cls._settings.__dict__ = {uid: val for uid, val in globals().items() if _check_valid_data(uid, val)}
         return I18nSettings._settings
 
-    def from_json(self, string):
+    def __getstate__(self):
-        data = dict(json.loads(string))
+        return self.to_dict()
+
+    def __setstate__(self, mapping):
+        return self.from_dict(mapping)
+
+    def from_dict(self, mapping):
         # Special case... :/
-        if "INTERN_PY_SYS_PATHS" in data:
+        if "INTERN_PY_SYS_PATHS" in mapping:
-            self.PY_SYS_PATHS = data["INTERN_PY_SYS_PATHS"]
+            self.PY_SYS_PATHS = mapping["INTERN_PY_SYS_PATHS"]
-        self.__dict__.update(data)
+        self.__dict__.update(mapping)
+
+    def to_dict(self):
+        glob = globals()
+        return {uid: val for uid, val in self.__dict__.items() if _check_valid_data(uid, val) and uid in glob}
+
+    def from_json(self, string):
+        self.from_dict(dict(json.loads(string)))
 
     def to_json(self):
         # Only save the diff from default i18n_settings!
         glob = globals()
-        export_dict = {uid: val for uid, val in self.__dict__.items() if glob.get(uid) != val}
+        export_dict = {uid: val for uid, val in self.__dict__.items() if _check_valid_data(uid, val) and glob.get(uid) != val}
         return json.dumps(export_dict)
 
     def load(self, fname, reset=False):

release/scripts/modules/bl_i18n_utils/utils.py

@@ -21,7 +21,6 @@
 # Some misc utilities...
 
 import collections
-import concurrent.futures
 import copy
 import hashlib
 import os
@@ -238,6 +237,12 @@ class I18nMessage:
         self.is_fuzzy = is_fuzzy
         self.is_commented = is_commented
 
+    # ~ def __getstate__(self):
+        # ~ return {key: getattr(self, key) for key in self.__slots__}
+
+    # ~ def __getstate__(self):
+        # ~ return {key: getattr(self, key) for key in self.__slots__}
+
     def _get_msgctxt(self):
         return "".join(self.msgctxt_lines)
 
@@ -426,6 +431,14 @@ class I18nMessages:
 
         self._reverse_cache = None
 
+    def __getstate__(self):
+        return (self.settings, self.uid, self.msgs, self.parsing_errors)
+
+    def __setstate__(self, data):
+        self.__init__()
+        self.settings, self.uid, self.msgs, self.parsing_errors = data
+        self.update_info()
+
     @staticmethod
     def _new_messages():
         return getattr(collections, 'OrderedDict', dict)()
@@ -566,8 +579,7 @@ class I18nMessages:
 
         # Next process new keys.
         if use_similar > 0.0:
-            with concurrent.futures.ProcessPoolExecutor() as exctr:
+            for key, msgid in map(get_best_similar,
-                for key, msgid in exctr.map(get_best_similar,
                                   tuple((nk, use_similar, tuple(similar_pool.keys())) for nk in new_keys)):
                 if msgid:
                     # Try to get the same context, else just get one...
@@ -1075,9 +1087,7 @@ class I18nMessages:
                 "-o",
                 fname,
             )
-            print("Running ", " ".join(cmd))
             ret = subprocess.call(cmd)
-            print("Finished.")
             return
         # XXX Code below is currently broken (generates corrupted mo files it seems :( )!
         # Using http://www.gnu.org/software/gettext/manual/html_node/MO-Files.html notation.