Allow hard-coded paths to be overridden with $XDG_DATA_DIRS

Necessary for post-installation relocatability.
Also ensure that data installed to share/gramps is in mac bundle.

svn: r21246

gramps/gen/const.py.in

@@ -93,12 +93,6 @@ APP_GRAMPS_PKG  = "application/x-gramps-package"
 APP_GENEWEB     = "application/x-geneweb"
 APP_VCARD       = ["text/x-vcard", "text/x-vcalendar"]
 
-#-------------------------------------------------------------------------
-#
-# system paths
-#
-#-------------------------------------------------------------------------
-LOCALE_DIR = "@LOCALE_DIR@"
 #-------------------------------------------------------------------------
 #
 # Platforms
@@ -205,6 +199,19 @@ else:
 # Paths to data files.
 #
 #-------------------------------------------------------------------------
+if "XDG_DATA_DIRS" in os.environ:
+    share = None
+    for path in os.environ["XDG_DATA_DIRS"].split(":"):
+        if os.path.exists(os.path.join(path, "gramps", "tips.xml")):
+            share = path
+            break
+    if not share:
+        share = os.path.split("@DATA_DIR@")[0]
+    LOCALE_DIR = os.path.join(share, "locale")
+    DATA_DIR = os.path.join(share, "gramps")
+    IMAGE_DIR = os.path.join(DATA_DIR, "icons", "hicolor")
+    DOC_DIR = os.path.join(share, "doc", "gramps")
+else:
     LOCALE_DIR = "@LOCALE_DIR@"
     DATA_DIR = "@DATA_DIR@"
     IMAGE_DIR = "@IMAGE_DIR@"

mac/gramps.bundle

@@ -183,6 +183,10 @@
     ${prefix}/lib/graphviz/config6
   </data>
 
+  <data>
+    ${prefix}/share/gramps
+  </data>
+
   <!-- Copy in the themes data. You may want to trim this to save space
        in your bundle. -->
   <data>