#N/A: Cache docker, gem, grunt and yarn output in rules

thefuck/rules/yarn_command_not_found.py

@@ -1,6 +1,7 @@
 import re
 from subprocess import Popen, PIPE
-from thefuck.utils import for_app, eager, replace_command, replace_argument
+from thefuck.utils import (for_app, eager, replace_command, replace_argument,
+                           cache, which)
 
 regex = re.compile(r'error Command "(.*)" not found.')
 
@@ -28,6 +29,10 @@ def _get_all_tasks():
             yield line.split(' ')[-1]
 
 
+if which('yarn'):
+    _get_all_tasks = cache(which('yarn'))(_get_all_tasks)
+
+
 def get_new_command(command):
     misspelled_task = regex.findall(command.output)[0]
     if misspelled_task in npm_commands: