Fix the output of minify js script

The order of the js files matters when minifying.

 * Use the '.order' files to put specified files top of the file list.
 * Sub-directory files inserted in list before root directory files.
 * Sort everything else alphabetically for consistant ordering.

minify_web_js.py

@@ -22,7 +22,7 @@ Usage: python minify_web_js.py deluge/ui/web/js/deluge-all
 """
 
 if len(sys.argv) != 2:
-    print "Specify a source js directory... e.g. "
+    print 'Specify a source js directory... e.g. deluge/ui/web/js/deluge-all'
     sys.exit(1)
 
 SOURCE_DIR = os.path.abspath(sys.argv[1])
@@ -30,8 +30,28 @@ BUILD_NAME = os.path.basename(SOURCE_DIR)
 BUILD_DIR = os.path.dirname(SOURCE_DIR)
 SRC_FILE_LIST = []
 for root, dirnames, filenames in os.walk(SOURCE_DIR):
-    for filename in fnmatch.filter(filenames, '*.js'):
-        SRC_FILE_LIST.append(os.path.join(root, filename))
+    dirnames.sort(reverse=True)
+    files = fnmatch.filter(filenames, "*.js")
+    files.sort()
+
+    order_file = os.path.join(root, '.order')
+    if os.path.isfile(order_file):
+        with open(order_file, 'r') as f:
+            for line in f:
+                line = line.strip()
+                if not line or line[0] == '#':
+                    continue
+                pos, filename = line.split()
+                files.pop(files.index(filename))
+                if pos == '+':
+                    files.insert(0, filename)
+
+    if not dirnames:
+        for fnames_ordered in reversed(files):
+            SRC_FILE_LIST.insert(0, os.path.join(root, fnames_ordered))
+    else:
+        for fnames_ordered in files:
+            SRC_FILE_LIST.append(os.path.join(root, fnames_ordered))
 
 if not SRC_FILE_LIST:
     print 'No js files found'