Adding support for closure compiler and some documentation

in the README about how to use it.


git-svn-id: http://svn.openlayers.org/trunk/openlayers@11448 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tools/closure.py

@@ -0,0 +1,21 @@
+import sys
+import os
+import tempfile
+
+path = os.path.join(os.path.dirname(__file__), "closure-compiler.jar")
+if not os.path.exists(path):
+    raise Exception("No closure-compiler.jar at %s; read README.txt!" % path)
+
+def minimize(code):
+    ntf = tempfile.NamedTemporaryFile()
+    ntf.write(code)
+    ntf.flush()
+
+    ntf2 = tempfile.NamedTemporaryFile()
+
+    os.system("java -jar %s --js %s --js_output_file %s" % (path, ntf.name, ntf2.name))
+    ntf2.seek(0)
+    data = ntf2.read()
+    ntf.close()
+    ntf2.close()
+    return data