Decouple the Gramps core from GObject

Author: bartfeenstra

gramps/gen/const.py

@@ -35,7 +35,12 @@
 import sys
 import uuid
 
-from gi.repository import GLib
+try:
+    from gi.repository import GLib
+
+    _GOBJECT_AVAILABLE = True
+except ModuleNotFoundError:
+    _GOBJECT_AVAILABLE = False
 
 # -------------------------------------------------------------------------
 #
@@ -119,7 +124,12 @@
     HOME_DIR = get_env_var("SAFEMODE")
 
 
-if os.path.exists(HOME_DIR) or "GRAMPSHOME" in os.environ or "SAFEMODE" in os.environ:
+if (
+    os.path.exists(HOME_DIR)
+    or "GRAMPSHOME" in os.environ
+    or "SAFEMODE" in os.environ
+    or not _GOBJECT_AVAILABLE
+):
     USER_DATA = HOME_DIR
     USER_CONFIG = HOME_DIR
     USER_CACHE = HOME_DIR
@@ -128,8 +138,11 @@
     USER_CONFIG = os.path.join(GLib.get_user_config_dir(), "gramps")
     USER_CACHE = os.path.join(GLib.get_user_cache_dir(), "gramps")
 
-USER_PICTURES = GLib.get_user_special_dir(GLib.UserDirectory.DIRECTORY_PICTURES)
-if not USER_PICTURES:
+if _GOBJECT_AVAILABLE:
+    USER_PICTURES = (
+        GLib.get_user_special_dir(GLib.UserDirectory.DIRECTORY_PICTURES) or HOME_DIR
+    )
+else:
     USER_PICTURES = HOME_DIR
 
 VERSION_DIR_NAME = "gramps%s%s" % (VERSION_TUPLE[0], VERSION_TUPLE[1])

gramps/gen/utils/requirements.py

@@ -25,13 +25,6 @@
 # -------------------------------------------------------------------------
 from importlib.util import find_spec
 
-# -------------------------------------------------------------------------
-#
-# GTK modules
-#
-# -------------------------------------------------------------------------
-import gi
-
 # -------------------------------------------------------------------------
 #
 # Gramps modules
@@ -90,9 +83,11 @@ def _test_gi(self, module, version):
         Test to see if a particular version of a module is available.
         """
         try:
+            import gi
+
             gi.require_version(module, version)
             return True
-        except ValueError:
+        except (ModuleNotFoundError, ValueError):
             return False
 
     def check_exe(self, executable):