Add no hard link support for ln

thefuck/rules/ln_no_hard_link.py

@@ -0,0 +1,24 @@
+"""Suggest creating symbolic link if hard link is not allowed.
+
+Example:
+> ln barDir barLink
+ln: ‘barDir’: hard link not allowed for directory
+
+--> ln -s barDir barLink
+"""
+
+import re
+from thefuck.utils import for_app
+from thefuck.specific.sudo import sudo_support
+
+
+@sudo_support
+@for_app('ln')
+def match(command):
+    return (command.stderr.endswith("hard link not allowed for directory") and
+            command.script.startswith("ln "))
+
+
+@sudo_support
+def get_new_command(command):
+    return re.sub(r'^ln ', 'ln -s ', command.script)