[scripts] add script to sort yaml files by (toplevel) key

_config.yml

@@ -3,7 +3,7 @@ destination: ./_site
 
 markdown:    kramdown
 
-exclude: ["static", "s"]
+exclude: ["static", "s", "scripts"]
 
 safe: true
 highlighter: rouge

scripts/sort_yaml.py

@@ -0,0 +1,38 @@
+import sys
+import re
+
+def sort_yaml(filename):
+
+    keys = []
+    blocks = {}
+
+    with open(filename, "r") as f:
+        current_block = ""
+        current_key = None
+
+        for line in f.readlines():
+            if line == "\n" and current_key is not None:
+                if current_key in keys:
+                    raise RuntimeError("Duplicate key '" + current_key + "'!")
+                keys.append(current_key)
+                blocks[current_key] = current_block
+                current_block = ""
+                current_key = None
+                continue
+            else:
+                m = re.match("^([a-z]+):\n$", line)
+                if m:
+                    if current_key is None:
+                        current_key = m.group(1)
+                    else:
+                        raise RuntimeError("New block not separated from the previous block by a newline!")
+                current_block += line
+
+    keys.sort()
+
+    for k in keys:
+        print(blocks[k])
+
+if __name__ == "__main__":
+    for filename in sys.argv[1:]:
+        sort_yaml(filename)