#24 Make no_command crossplatform

README.md

@@ -193,9 +193,7 @@ The Fuck has a few settings parameters, they can be changed in `~/.thefuck/setti
 
 * `rules` – list of enabled rules, by default all;
 * `require_confirmation` – require confirmation before running new command, by default `False`; 
-* `wait_command` – max amount of time in seconds for getting previous command output;
-* `command_not_found` – path to `command_not_found` binary,
-by default `/usr/lib/command-not-found`.
+* `wait_command` – max amount of time in seconds for getting previous command output.
 
 ## Developing
 

tests/rules/test_no_command.py

@@ -1,62 +1,19 @@
-from subprocess import PIPE
 from mock import patch, Mock
-import pytest
 from thefuck.rules.no_command import match, get_new_command
-from thefuck.main import Command
 
 
-@pytest.fixture
-def command_found():
-    return b'''No command 'aptget' found, did you mean:
- Command 'apt-get' from package 'apt' (main)
-aptget: command not found
-'''
-
-@pytest.fixture
-def command_not_found():
-    return b'''No command 'vom' found, but there are 19 similar ones
-vom: command not found
-'''
+def test_match():
+    with patch('thefuck.rules.no_command._get_all_bins',
+               return_value=['vim', 'apt-get']):
+        assert match(Mock(stderr='vom: not found', script='vom file.py'), None)
+        assert not match(Mock(stderr='qweqwe: not found', script='qweqwe'), None)
+        assert not match(Mock(stderr='some text', script='vom file.py'), None)
 
 
-@pytest.fixture
-def bins_exists(request):
-    p = patch('thefuck.rules.no_command.which',
-              return_value=True)
-    p.start()
-    request.addfinalizer(p.stop)
-
-
-@pytest.fixture
-def settings():
-    class _Settings(object):
-        pass
-    return _Settings
-
-
-@pytest.mark.usefixtures('bins_exists')
-def test_match(command_found, command_not_found, settings):
-    with patch('thefuck.rules.no_command.Popen') as Popen:
-        Popen.return_value.stderr.read.return_value = command_found
-        assert match(Command('aptget install vim', '', ''), settings)
-        Popen.assert_called_once_with('/usr/lib/command-not-found aptget',
-                                      shell=True, stderr=PIPE)
-        Popen.return_value.stderr.read.return_value = command_not_found
-        assert not match(Command('ls', '', ''), settings)
-
-    with patch('thefuck.rules.no_command.Popen') as Popen:
-        Popen.return_value.stderr.read.return_value = command_found
-        assert match(Command('sudo aptget install vim', '', ''),
-                     Mock(command_not_found='test'))
-        Popen.assert_called_once_with('test aptget',
-                                      shell=True, stderr=PIPE)
-
-
-@pytest.mark.usefixtures('bins_exists')
-def test_get_new_command(command_found):
-    with patch('thefuck.rules.no_command._get_output',
-               return_value=command_found.decode()):
-        assert get_new_command(Command('aptget install vim', '', ''), settings)\
-            == 'apt-get install vim'
-        assert get_new_command(Command('sudo aptget install vim', '', ''), settings) \
-            == 'sudo apt-get install vim'
+def test_get_new_command():
+    with patch('thefuck.rules.no_command._get_all_bins',
+               return_value=['vim', 'apt-get']):
+        assert get_new_command(
+            Mock(stderr='vom: not found',
+                 script='vom file.py'),
+            None) == 'vim file.py'

thefuck/rules/no_command.py

@@ -1,30 +1,23 @@
-from subprocess import Popen, PIPE
-import re
-from thefuck.utils import which, wrap_settings
+from difflib import get_close_matches
+import os
+from pathlib import Path
 
 
-local_settings = {'command_not_found': '/usr/lib/command-not-found'}
+def _get_all_bins():
+    return [exe.name
+            for path in os.environ['PATH'].split(':')
+            for exe in Path(path).iterdir()
+            if exe.is_file()]
 
 
-def _get_output(command, settings):
-    name = command.script.split(' ')[command.script.startswith('sudo')]
-    check_script = u'{} {}'.format(settings.command_not_found, name)
-    result = Popen(check_script, shell=True, stderr=PIPE)
-    return result.stderr.read().decode('utf-8')
-
-
-@wrap_settings(local_settings)
 def match(command, settings):
-    if which(settings.command_not_found):
-        output = _get_output(command, settings)
-        return "No command" in output and "from package" in output
+    return 'not found' in command.stderr and \
+           bool(get_close_matches(command.script.split(' ')[0],
+                                  _get_all_bins()))
 
 
-@wrap_settings(local_settings)
 def get_new_command(command, settings):
-    output = _get_output(command, settings)
-    broken_name = re.findall(r"No command '([^']*)' found",
-                             output)[0]
-    fixed_name = re.findall(r"Command '([^']*)' from package",
-                            output)[0]
-    return command.script.replace(broken_name, fixed_name, 1)
+    old_command = command.script.split(' ')[0]
+    new_command = get_close_matches(old_command,
+                                    _get_all_bins())[0]
+    return ' '.join([new_command] + command.script.split(' ')[1:])