Don't generate project if the XML file already exists and is identical to what...

Don't generate project if the XML file already exists and is identical to what we've generated. Overridable with a "force" argument to mkproject().

Mac/Lib/mkcwproject/__init__.py

@@ -4,7 +4,7 @@ import os
 import AppleEvents
 import macfs
 
-def mkproject(outputfile, modulename, settings):
+def mkproject(outputfile, modulename, settings, force=0):
 	#
 	# Copy the dictionary
 	#
@@ -29,6 +29,14 @@ def mkproject(outputfile, modulename, settings):
 	#
 	xmlbuilder = cwxmlgen.ProjectBuilder(dictcopy)
 	xmlbuilder.generate()
+	if not force:
+		# check whether it is the same as it was
+		if os.path.exists(dictcopy['mac_projectxmlname']):
+			fp = open(dictcopy['mac_projectxmlname'])
+			data = fp.read()
+			fp.close()
+			if data == dictcopy["tmp_projectxmldata"]:
+				return
 	fp = open(dictcopy['mac_projectxmlname'], "w")
 	fp.write(dictcopy["tmp_projectxmldata"])
 	fp.close()