implement -E command-line switch

jtlc

@@ -35,13 +35,23 @@ def main(argv):
         success = translate(args, s, tf)
         tf.close()
         if success:
+            suffix = '.c' if args.E else '.o'
             m = re.match('(.*)\.jtl', s)
             if m is not None:
-                ofname = m.group(1) + '.o'
+                ofname = m.group(1) + suffix
             else:
-                ofname = s + '.o'
-            success = do_compile(args, tfname, ofname)
-            ofiles.append(ofname)
+                ofname = s + suffix
+            if args.E:
+                f = open(tfname, 'r')
+                content = f.read()
+                f.close()
+                f = open(ofname, 'w')
+                f.write(content)
+                f.close()
+                return 0
+            else:
+                success = do_compile(args, tfname, ofname)
+                ofiles.append(ofname)
         os.unlink(tfname)
 
     if success and not args.c: