Work around g-ir-scanner problem with Gdk.Rectangle

g-ir-scanner is currently buggy and confuses the Gdk.Rectangle alias
with MetaRectangle. Since this is moderately hard to fix in
gobject-introspection and the fix would conflict with in-progress
changes, work around by doing a 'sed job' on the generated Meta.gir.

https://bugzilla.gnome.org/show_bug.cgi?id=623640

src/Makefile.am

@@ -210,8 +210,12 @@ Shell-0.1.gir: $(mutter) $(G_IR_SCANNER) St-1.0.gir libgnome-shell.la Makefile
 		$(addprefix $(srcdir)/,$(libgnome_shell_la_gir_sources)) \
 		$(libgnome_shell_la_CPPFLAGS)		\
 		-I $(srcdir)				\
-		-o $@
+		-o $@.tmp &&				\
+	$(PYTHON) $(srcdir)/fix-meta-rectangle.py $@.tmp $@.tmp2 &&	\
+	rm $@.tmp &&							\
+	mv $@.tmp2 $@
 CLEANFILES += Shell-0.1.gir
+EXTRA_DIST += fix-meta-rectangle.py
 
 # The dependency on libgnome-shell.la here is because g-ir-compiler opens it
 # (not the fake library, since we've already done the rewriting)

src/fix-meta-rectangle.py

@@ -0,0 +1,21 @@
+#!/usr/bin/python
+import re
+import sys
+
+# gobject-introspection currently has a bug where an alias like
+# 'typedef GdkRectangle cairo_rect_int_t' is stored un-namespaced,
+# so it is taken to apply to all *Rectangle types. Fixing this
+# requires a significant rework of g-ir-scanner, so for the moment
+# we fix up the output using this script.
+#
+# https://bugzilla.gnome.org/show_bug.cgi?id=622609
+
+GDK_RECTANGLE = re.compile(r'Gdk\.Rectangle')
+META_RECTANGLE = re.compile(r'MetaRectangle')
+
+i = open(sys.argv[1], 'r')
+o = open(sys.argv[2], 'w')
+for line in i:
+    if GDK_RECTANGLE.search(line) and META_RECTANGLE.search(line):
+        line = re.sub('Gdk.Rectangle', 'Meta.Rectangle', line)
+    o.write(line)