Support for yum invalid commands. (#968)

* - Add skeleton code for yum_invalid_operation.py
- Add test for rule/yum_invalid_operation

* Add: mocker for subprocess.Popen.

* Fix: invalid yum_operations.

* Fix: Added missing fixtures.

* Add: yum_invalid_operation implementation.

* Add: enabled_by_default variable for rules/yum_invalid_operation.

* Update Readme.

thefuck/rules/yum_invalid_operation.py

@@ -0,0 +1,39 @@
+import subprocess
+from itertools import dropwhile, islice, takewhile
+
+from thefuck.specific.sudo import sudo_support
+from thefuck.specific.yum import yum_available
+from thefuck.utils import for_app, replace_command, which, cache
+
+enabled_by_default = yum_available
+
+
+@sudo_support
+@for_app('yum')
+def match(command):
+    return 'No such command: ' in command.output
+
+
+def _get_operations():
+    proc = subprocess.Popen('yum', stdout=subprocess.PIPE)
+
+    lines = proc.stdout.readlines()
+    lines = [line.decode('utf-8') for line in lines]
+    lines = dropwhile(lambda line: not line.startswith("List of Commands:"), lines)
+    lines = islice(lines, 2, None)
+    lines = list(takewhile(lambda line: line.strip(), lines))
+    return [line.strip().split(' ')[0] for line in lines]
+
+
+if which('yum'):
+    _get_operations = cache(which('yum'))(_get_operations)
+
+
+@sudo_support
+def get_new_command(command):
+    invalid_operation = command.script_parts[1]
+
+    if invalid_operation == 'uninstall':
+        return [command.script.replace('uninstall', 'remove')]
+
+    return replace_command(command, invalid_operation, _get_operations())

thefuck/specific/yum.py

@@ -0,0 +1,3 @@
+from thefuck.utils import which
+
+yum_available = bool(which('yum'))