#298 Add ability to chose matched rule

README.md

@@ -212,7 +212,7 @@ in `~/.thefuck/rules`. The rule should contain two functions:
 
 ```python
 match(command: Command, settings: Settings) -> bool
-get_new_command(command: Command, settings: Settings) -> str
+get_new_command(command: Command, settings: Settings) -> str | list[str]
 ```
 
 Also the rule can contain an optional function `side_effect(command: Command, settings: Settings) -> None`

setup.py

@@ -22,7 +22,7 @@ elif (3, 0) < version < (3, 3):
 
 VERSION = '2.5.6'
 
-install_requires = ['psutil', 'colorama', 'six']
+install_requires = ['psutil', 'colorama', 'six', 'getch']
 extras_require = {':python_version<"3.4"': ['pathlib']}
 
 setup(name='thefuck',

tests/test_corrector.py

@@ -0,0 +1,88 @@
+import pytest
+from pathlib import PosixPath, Path
+from mock import Mock
+from thefuck import corrector, conf, types
+from tests.utils import Rule, Command
+from thefuck.corrector import make_corrected_commands, get_corrected_commands
+
+
+def test_load_rule(mocker):
+    match = object()
+    get_new_command = object()
+    load_source = mocker.patch(
+        'thefuck.corrector.load_source',
+        return_value=Mock(match=match,
+                          get_new_command=get_new_command,
+                          enabled_by_default=True,
+                          priority=900,
+                          requires_output=True))
+    assert corrector.load_rule(Path('/rules/bash.py'), settings=Mock(priority={})) \
+           == Rule('bash', match, get_new_command, priority=900)
+    load_source.assert_called_once_with('bash', '/rules/bash.py')
+
+
+class TestGetRules(object):
+    @pytest.fixture(autouse=True)
+    def glob(self, mocker):
+        return mocker.patch('thefuck.corrector.Path.glob', return_value=[])
+
+    def _compare_names(self, rules, names):
+        return [r.name for r in rules] == names
+
+    @pytest.mark.parametrize('conf_rules, rules', [
+        (conf.DEFAULT_RULES, ['bash', 'lisp', 'bash', 'lisp']),
+        (types.RulesNamesList(['bash']), ['bash', 'bash'])])
+    def test_get(self, monkeypatch, glob, conf_rules, rules):
+        glob.return_value = [PosixPath('bash.py'), PosixPath('lisp.py')]
+        monkeypatch.setattr('thefuck.corrector.load_source',
+                            lambda x, _: Rule(x))
+        assert self._compare_names(
+            corrector.get_rules(Path('~'), Mock(rules=conf_rules, priority={})),
+            rules)
+
+
+class TestGetMatchedRules(object):
+    def test_no_match(self):
+        assert list(corrector.get_matched_rules(
+            Command('ls'), [Rule('', lambda *_: False)],
+            Mock(no_colors=True))) == []
+
+    def test_match(self):
+        rule = Rule('', lambda x, _: x.script == 'cd ..')
+        assert list(corrector.get_matched_rules(
+            Command('cd ..'), [rule], Mock(no_colors=True))) == [rule]
+
+    def test_when_rule_failed(self, capsys):
+        all(corrector.get_matched_rules(
+            Command('ls'), [Rule('test', Mock(side_effect=OSError('Denied')),
+                                 requires_output=False)],
+            Mock(no_colors=True, debug=False)))
+        assert capsys.readouterr()[1].split('\n')[0] == '[WARN] Rule test:'
+
+
+class TestGetCorrectedCommands(object):
+    def test_with_rule_returns_list(self):
+        rule = Rule(get_new_command=lambda x, _: [x.script + '!', x.script + '@'],
+                    priority=100)
+        assert list(make_corrected_commands(Command(script='test'), [rule], None)) \
+               == [types.CorrectedCommand(script='test!', priority=100, side_effect=None),
+                   types.CorrectedCommand(script='test@', priority=200, side_effect=None)]
+
+    def test_with_rule_returns_command(self):
+        rule = Rule(get_new_command=lambda x, _: x.script + '!',
+                    priority=100)
+        assert list(make_corrected_commands(Command(script='test'), [rule], None)) \
+               == [types.CorrectedCommand(script='test!', priority=100, side_effect=None)]
+
+
+def test_get_corrected_commands(mocker):
+    command = Command('test', 'test', 'test')
+    rules = [Rule(match=lambda *_: False),
+             Rule(match=lambda *_: True,
+                  get_new_command=lambda x, _: x.script + '!', priority=100),
+             Rule(match=lambda *_: True,
+                  get_new_command=lambda x, _: [x.script + '@', x.script + ';'],
+                  priority=60)]
+    mocker.patch('thefuck.corrector.get_rules', return_value=rules)
+    assert [cmd.script for cmd in get_corrected_commands(command, None, Mock(debug=False))]\
+        == ['test@', 'test!', 'test;']

tests/test_main.py

@@ -1,61 +1,8 @@
 import pytest
 from subprocess import PIPE
-from pathlib import PosixPath, Path
 from mock import Mock
-from thefuck import main, conf, types
-from tests.utils import Rule, Command
-
-
-def test_load_rule(mocker):
-    match = object()
-    get_new_command = object()
-    load_source = mocker.patch(
-        'thefuck.main.load_source',
-        return_value=Mock(match=match,
-                          get_new_command=get_new_command,
-                          enabled_by_default=True,
-                          priority=900,
-                          requires_output=True))
-    assert main.load_rule(Path('/rules/bash.py')) \
-           == Rule('bash', match, get_new_command, priority=900)
-    load_source.assert_called_once_with('bash', '/rules/bash.py')
-
-
-class TestGetRules(object):
-    @pytest.fixture(autouse=True)
-    def glob(self, mocker):
-        return mocker.patch('thefuck.main.Path.glob', return_value=[])
-
-    def _compare_names(self, rules, names):
-        return [r.name for r in rules] == names
-
-    @pytest.mark.parametrize('conf_rules, rules', [
-        (conf.DEFAULT_RULES, ['bash', 'lisp', 'bash', 'lisp']),
-        (types.RulesNamesList(['bash']), ['bash', 'bash'])])
-    def test_get(self, monkeypatch, glob, conf_rules, rules):
-        glob.return_value = [PosixPath('bash.py'), PosixPath('lisp.py')]
-        monkeypatch.setattr('thefuck.main.load_source',
-                            lambda x, _: Rule(x))
-        assert self._compare_names(
-            main.get_rules(Path('~'), Mock(rules=conf_rules, priority={})),
-            rules)
-
-    @pytest.mark.parametrize('priority, unordered, ordered', [
-        ({},
-         [Rule('bash', priority=100), Rule('python', priority=5)],
-         ['python', 'bash']),
-        ({},
-         [Rule('lisp', priority=9999), Rule('c', priority=conf.DEFAULT_PRIORITY)],
-         ['c', 'lisp']),
-        ({'python': 9999},
-         [Rule('bash', priority=100), Rule('python', priority=5)],
-         ['bash', 'python'])])
-    def test_ordered_by_priority(self, monkeypatch, priority, unordered, ordered):
-        monkeypatch.setattr('thefuck.main._get_loaded_rules',
-                            lambda *_: unordered)
-        assert self._compare_names(
-            main.get_rules(Path('~'), Mock(priority=priority)),
-            ordered)
+from thefuck import main
+from tests.utils import Command
 
 
 class TestGetCommand(object):
@@ -79,7 +26,7 @@ class TestGetCommand(object):
 
     def test_get_command_calls(self, Popen):
         assert main.get_command(Mock(env={}),
-            ['thefuck', 'apt-get', 'search', 'vim']) \
+                                ['thefuck', 'apt-get', 'search', 'vim']) \
                == Command('apt-get search vim', 'stdout', 'stderr')
         Popen.assert_called_once_with('apt-get search vim',
                                       shell=True,
@@ -95,80 +42,3 @@ class TestGetCommand(object):
             assert main.get_command(Mock(env={}), args).script == result
         else:
             assert main.get_command(Mock(env={}), args) is None
-
-
-class TestGetMatchedRule(object):
-    def test_no_match(self):
-        assert main.get_matched_rule(
-            Command('ls'), [Rule('', lambda *_: False)],
-            Mock(no_colors=True)) is None
-
-    def test_match(self):
-        rule = Rule('', lambda x, _: x.script == 'cd ..')
-        assert main.get_matched_rule(
-            Command('cd ..'), [rule], Mock(no_colors=True)) == rule
-
-    def test_when_rule_failed(self, capsys):
-        main.get_matched_rule(
-            Command('ls'), [Rule('test', Mock(side_effect=OSError('Denied')))],
-            Mock(no_colors=True, debug=False))
-        assert capsys.readouterr()[1].split('\n')[0] == '[WARN] Rule test:'
-
-
-class TestRunRule(object):
-    @pytest.fixture(autouse=True)
-    def confirm(self, mocker):
-        return mocker.patch('thefuck.main.confirm', return_value=True)
-
-    def test_run_rule(self, capsys):
-        main.run_rule(Rule(get_new_command=lambda *_: 'new-command'),
-                      Command(), None)
-        assert capsys.readouterr() == ('new-command\n', '')
-
-    def test_run_rule_with_side_effect(self, capsys):
-        side_effect = Mock()
-        settings = Mock(debug=False)
-        command = Command()
-        main.run_rule(Rule(get_new_command=lambda *_: 'new-command',
-                           side_effect=side_effect),
-                      command, settings)
-        assert capsys.readouterr() == ('new-command\n', '')
-        side_effect.assert_called_once_with(command, settings)
-
-    def test_when_not_comfirmed(self, capsys, confirm):
-        confirm.return_value = False
-        main.run_rule(Rule(get_new_command=lambda *_: 'new-command'),
-                      Command(), None)
-        assert capsys.readouterr() == ('', '')
-
-
-class TestConfirm(object):
-    @pytest.fixture
-    def stdin(self, mocker):
-        return mocker.patch('sys.stdin.read', return_value='\n')
-
-    def test_when_not_required(self, capsys):
-        assert main.confirm('command', None, Mock(require_confirmation=False))
-        assert capsys.readouterr() == ('', 'command\n')
-
-    def test_with_side_effect_and_without_confirmation(self, capsys):
-        assert main.confirm('command', Mock(), Mock(require_confirmation=False))
-        assert capsys.readouterr() == ('', 'command (+side effect)\n')
-
-    # `stdin` fixture should be applied after `capsys`
-    def test_when_confirmation_required_and_confirmed(self, capsys, stdin):
-        assert main.confirm('command', None, Mock(require_confirmation=True,
-                                                  no_colors=True))
-        assert capsys.readouterr() == ('', 'command [enter/ctrl+c]')
-
-    # `stdin` fixture should be applied after `capsys`
-    def test_when_confirmation_required_and_confirmed_with_side_effect(self, capsys, stdin):
-        assert main.confirm('command', Mock(), Mock(require_confirmation=True,
-                                                    no_colors=True))
-        assert capsys.readouterr() == ('', 'command (+side effect) [enter/ctrl+c]')
-
-    def test_when_confirmation_required_and_aborted(self, capsys, stdin):
-        stdin.side_effect = KeyboardInterrupt
-        assert not main.confirm('command', None, Mock(require_confirmation=True,
-                                                      no_colors=True))
-        assert capsys.readouterr() == ('', 'command [enter/ctrl+c]Aborted\n')

tests/test_ui.py

@@ -0,0 +1,115 @@
+from mock import Mock
+import pytest
+from itertools import islice
+from thefuck import ui
+from thefuck.types import CorrectedCommand
+
+
+@pytest.fixture
+def patch_getch(monkeypatch):
+    def patch(vals):
+        def getch():
+            for val in vals:
+                if val == KeyboardInterrupt:
+                    raise val
+                else:
+                    yield val
+
+        getch_gen = getch()
+        monkeypatch.setattr('thefuck.ui.getch', lambda: next(getch_gen))
+
+    return patch
+
+
+def test_read_actions(patch_getch):
+    patch_getch([  # Enter:
+                   '\n',
+                   # Enter:
+                   '\r',
+                   # Ignored:
+                   'x', 'y',
+                   # Up:
+                   '\x1b', '[', 'A',
+                   # Down:
+                   '\x1b', '[', 'B',
+                   # Ctrl+C:
+                   KeyboardInterrupt], )
+    assert list(islice(ui.read_actions(), 5)) \
+           == [ui.SELECT, ui.SELECT, ui.PREVIOUS, ui.NEXT, ui.ABORT]
+
+
+def test_command_selector():
+    selector = ui.CommandSelector([1, 2, 3])
+    assert selector.value == 1
+    changes = []
+    selector.on_change(changes.append)
+    selector.next()
+    assert selector.value == 2
+    selector.next()
+    assert selector.value == 3
+    selector.next()
+    assert selector.value == 1
+    selector.previous()
+    assert selector.value == 3
+    assert changes == [1, 2, 3, 1, 3]
+
+
+class TestSelectCommand(object):
+    @pytest.fixture
+    def commands_with_side_effect(self):
+        return [CorrectedCommand('ls', lambda *_: None, 100),
+                CorrectedCommand('cd', lambda *_: None, 100)]
+
+    @pytest.fixture
+    def commands(self):
+        return [CorrectedCommand('ls', None, 100),
+                CorrectedCommand('cd', None, 100)]
+
+    def test_without_commands(self, capsys):
+        assert ui.select_command([], Mock(debug=False, no_color=True)) is None
+        assert capsys.readouterr() == ('', 'No fuck given\n')
+
+    def test_without_confirmation(self, capsys, commands):
+        assert ui.select_command(commands,
+                                 Mock(debug=False, no_color=True,
+                                      require_confirmation=False)) == commands[0]
+        assert capsys.readouterr() == ('', 'ls\n')
+
+    def test_without_confirmation_with_side_effects(self, capsys,
+                                                    commands_with_side_effect):
+        assert ui.select_command(commands_with_side_effect,
+                                 Mock(debug=False, no_color=True,
+                                      require_confirmation=False)) \
+               == commands_with_side_effect[0]
+        assert capsys.readouterr() == ('', 'ls (+side effect)\n')
+
+    def test_with_confirmation(self, capsys, patch_getch, commands):
+        patch_getch(['\n'])
+        assert ui.select_command(commands,
+                                 Mock(debug=False, no_color=True,
+                                      require_confirmation=True)) == commands[0]
+        assert capsys.readouterr() == ('', '\x1b[1K\rls [enter/↑/↓/ctrl+c]\n')
+
+    def test_with_confirmation_abort(self, capsys, patch_getch, commands):
+        patch_getch([KeyboardInterrupt])
+        assert ui.select_command(commands,
+                                 Mock(debug=False, no_color=True,
+                                      require_confirmation=True)) is None
+        assert capsys.readouterr() == ('', '\x1b[1K\rls [enter/↑/↓/ctrl+c]\nAborted\n')
+
+    def test_with_confirmation_with_side_effct(self, capsys, patch_getch,
+                                               commands_with_side_effect):
+        patch_getch(['\n'])
+        assert ui.select_command(commands_with_side_effect,
+                                 Mock(debug=False, no_color=True,
+                                      require_confirmation=True))\
+               == commands_with_side_effect[0]
+        assert capsys.readouterr() == ('', '\x1b[1K\rls (+side effect) [enter/↑/↓/ctrl+c]\n')
+
+    def test_with_confirmation_select_second(self, capsys, patch_getch, commands):
+        patch_getch(['\x1b', '[', 'B', '\n'])
+        assert ui.select_command(commands,
+                                 Mock(debug=False, no_color=True,
+                                      require_confirmation=True)) == commands[1]
+        assert capsys.readouterr() == (
+            '', '\x1b[1K\rls [enter/↑/↓/ctrl+c]\x1b[1K\rcd [enter/↑/↓/ctrl+c]\n')

thefuck/corrector.py

@@ -0,0 +1,77 @@
+from imp import load_source
+from pathlib import Path
+from . import conf, types, logs
+import sys
+
+
+def load_rule(rule, settings):
+    """Imports rule module and returns it."""
+    name = rule.name[:-3]
+    rule_module = load_source(name, str(rule))
+    priority = getattr(rule_module, 'priority', conf.DEFAULT_PRIORITY)
+    return types.Rule(name, rule_module.match,
+                      rule_module.get_new_command,
+                      getattr(rule_module, 'enabled_by_default', True),
+                      getattr(rule_module, 'side_effect', None),
+                      settings.priority.get(name, priority),
+                      getattr(rule_module, 'requires_output', True))
+
+
+def get_loaded_rules(rules, settings):
+    """Yields all available rules."""
+    for rule in rules:
+        if rule.name != '__init__.py':
+            loaded_rule = load_rule(rule, settings)
+            if loaded_rule in settings.rules:
+                yield loaded_rule
+
+
+def get_rules(user_dir, settings):
+    """Returns all enabled rules."""
+    bundled = Path(__file__).parent \
+        .joinpath('rules') \
+        .glob('*.py')
+    user = user_dir.joinpath('rules').glob('*.py')
+    return get_loaded_rules(sorted(bundled) + sorted(user), settings)
+
+
+def get_matched_rules(command, rules, settings):
+    """Returns first matched rule for command."""
+    script_only = command.stdout is None and command.stderr is None
+
+    for rule in rules:
+        if script_only and rule.requires_output:
+            continue
+
+        try:
+            with logs.debug_time(u'Trying rule: {};'.format(rule.name),
+                                 settings):
+                if rule.match(command, settings):
+                    yield rule
+        except Exception:
+            logs.rule_failed(rule, sys.exc_info(), settings)
+
+
+def make_corrected_commands(command, rules, settings):
+    for rule in rules:
+        new_commands = rule.get_new_command(command, settings)
+        if not isinstance(new_commands, list):
+            new_commands = [new_commands]
+        for n, new_command in enumerate(new_commands):
+            yield types.CorrectedCommand(script=new_command,
+                                         side_effect=rule.side_effect,
+                                         priority=(n + 1) * rule.priority)
+
+
+def get_corrected_commands(command, user_dir, settings):
+    rules = list(get_rules(user_dir, settings))
+    logs.debug(
+        u'Loaded rules: {}'.format(', '.join(rule.name for rule in rules)),
+        settings)
+    matched = list(get_matched_rules(command, rules, settings))
+    logs.debug(
+        u'Matched rules: {}'.format(', '.join(rule.name for rule in matched)),
+        settings)
+    corrected_commands = make_corrected_commands(command, matched, settings)
+    return sorted(corrected_commands,
+                  key=lambda corrected_command: corrected_command.priority)

thefuck/logs.py

@@ -28,27 +28,6 @@ def rule_failed(rule, exc_info, settings):
     exception('Rule {}'.format(rule.name), exc_info, settings)
 
 
-def show_command(new_command, side_effect, settings):
-    sys.stderr.write('{bold}{command}{reset}{side_effect}\n'.format(
-        command=new_command,
-        side_effect=' (+side effect)' if side_effect else '',
-        bold=color(colorama.Style.BRIGHT, settings),
-        reset=color(colorama.Style.RESET_ALL, settings)))
-
-
-def confirm_command(new_command, side_effect, settings):
-    sys.stderr.write(
-        '{bold}{command}{reset}{side_effect} '
-        '[{green}enter{reset}/{red}ctrl+c{reset}]'.format(
-            command=new_command,
-            side_effect=' (+side effect)' if side_effect else '',
-            bold=color(colorama.Style.BRIGHT, settings),
-            green=color(colorama.Fore.GREEN, settings),
-            red=color(colorama.Fore.RED, settings),
-            reset=color(colorama.Style.RESET_ALL, settings)))
-    sys.stderr.flush()
-
-
 def failed(msg, settings):
     sys.stderr.write('{red}{msg}{reset}\n'.format(
         msg=msg,
@@ -56,6 +35,27 @@ def failed(msg, settings):
         reset=color(colorama.Style.RESET_ALL, settings)))
 
 
+def show_corrected_command(corrected_command, settings):
+    sys.stderr.write('{bold}{script}{reset}{side_effect}\n'.format(
+        script=corrected_command.script,
+        side_effect=' (+side effect)' if corrected_command.side_effect else '',
+        bold=color(colorama.Style.BRIGHT, settings),
+        reset=color(colorama.Style.RESET_ALL, settings)))
+
+
+def confirm_text(corrected_command, settings):
+    sys.stderr.write(
+        '\033[1K\r{bold}{script}{reset}{side_effect} '
+        '[{green}enter{reset}/{blue}↑{reset}/{blue}↓{reset}/{red}ctrl+c{reset}]'.format(
+            script=corrected_command.script,
+            side_effect=' (+side effect)' if corrected_command.side_effect else '',
+            bold=color(colorama.Style.BRIGHT, settings),
+            green=color(colorama.Fore.GREEN, settings),
+            red=color(colorama.Fore.RED, settings),
+            reset=color(colorama.Style.RESET_ALL, settings),
+            blue=color(colorama.Fore.BLUE, settings)))
+
+
 def debug(msg, settings):
     if settings.debug:
         sys.stderr.write(u'{blue}{bold}DEBUG:{reset} {msg}\n'.format(

thefuck/main.py

@@ -1,4 +1,3 @@
-from imp import load_source
 from pathlib import Path
 from os.path import expanduser
 from pprint import pformat
@@ -9,6 +8,8 @@ from psutil import Process, TimeoutExpired
 import colorama
 import six
 from . import logs, conf, types, shells
+from .corrector import get_corrected_commands
+from .ui import select_command
 
 
 def setup_user_dir():
@@ -21,37 +22,6 @@ def setup_user_dir():
     return user_dir
 
 
-def load_rule(rule):
-    """Imports rule module and returns it."""
-    rule_module = load_source(rule.name[:-3], str(rule))
-    return types.Rule(rule.name[:-3], rule_module.match,
-                      rule_module.get_new_command,
-                      getattr(rule_module, 'enabled_by_default', True),
-                      getattr(rule_module, 'side_effect', None),
-                      getattr(rule_module, 'priority', conf.DEFAULT_PRIORITY),
-                      getattr(rule_module, 'requires_output', True))
-
-
-def _get_loaded_rules(rules, settings):
-    """Yields all available rules."""
-    for rule in rules:
-        if rule.name != '__init__.py':
-            loaded_rule = load_rule(rule)
-            if loaded_rule in settings.rules:
-                yield loaded_rule
-
-
-def get_rules(user_dir, settings):
-    """Returns all enabled rules."""
-    bundled = Path(__file__).parent \
-        .joinpath('rules') \
-        .glob('*.py')
-    user = user_dir.joinpath('rules').glob('*.py')
-    rules = _get_loaded_rules(sorted(bundled) + sorted(user), settings)
-    return sorted(rules, key=lambda rule: settings.priority.get(
-        rule.name, rule.priority))
-
-
 def wait_output(settings, popen):
     """Returns `True` if we can get output of the command in the
     `wait_command` time.
@@ -100,46 +70,12 @@ def get_command(settings, args):
             return types.Command(script, None, None)
 
 
-def get_matched_rule(command, rules, settings):
-    """Returns first matched rule for command."""
-    script_only = command.stdout is None and command.stderr is None
-
-    for rule in rules:
-        if script_only and rule.requires_output:
-            continue
-
-        try:
-            with logs.debug_time(u'Trying rule: {};'.format(rule.name),
-                                 settings):
-                if rule.match(command, settings):
-                    return rule
-        except Exception:
-            logs.rule_failed(rule, sys.exc_info(), settings)
-
-
-def confirm(new_command, side_effect, settings):
-    """Returns `True` when running of new command confirmed."""
-    if not settings.require_confirmation:
-        logs.show_command(new_command, side_effect, settings)
-        return True
-
-    logs.confirm_command(new_command, side_effect, settings)
-    try:
-        sys.stdin.read(1)
-        return True
-    except KeyboardInterrupt:
-        logs.failed('Aborted', settings)
-        return False
-
-
-def run_rule(rule, command, settings):
+def run_command(command, settings):
     """Runs command from rule for passed command."""
-    new_command = shells.to_shell(rule.get_new_command(command, settings))
-    if confirm(new_command, rule.side_effect, settings):
-        if rule.side_effect:
-            rule.side_effect(command, settings)
-        shells.put_to_history(new_command)
-        print(new_command)
+    if command.side_effect:
+        command.side_effect(command, settings)
+    shells.put_to_history(command.script)
+    print(command.script)
 
 
 # Entry points:
@@ -152,18 +88,10 @@ def main():
         logs.debug(u'Run with settings: {}'.format(pformat(settings)), settings)
 
         command = get_command(settings, sys.argv)
-        rules = get_rules(user_dir, settings)
-        logs.debug(
-            u'Loaded rules: {}'.format(', '.join(rule.name for rule in rules)),
-            settings)
-
-        matched_rule = get_matched_rule(command, rules, settings)
-        if matched_rule:
-            logs.debug(u'Matched rule: {}'.format(matched_rule.name), settings)
-            run_rule(matched_rule, command, settings)
-            return
-
-        logs.failed('No fuck given', settings)
+        corrected_commands = get_corrected_commands(command, user_dir, settings)
+        selected_command = select_command(corrected_commands, settings)
+        if selected_command:
+            run_command(selected_command, settings)
 
 
 def print_alias():

thefuck/types.py

@@ -3,6 +3,8 @@ from collections import namedtuple
 
 Command = namedtuple('Command', ('script', 'stdout', 'stderr'))
 
+CorrectedCommand = namedtuple('CorrectedCommand', ('script', 'side_effect', 'priority'))
+
 Rule = namedtuple('Rule', ('name', 'match', 'get_new_command',
                            'enabled_by_default', 'side_effect',
                            'priority', 'requires_output'))

thefuck/ui.py

@@ -0,0 +1,88 @@
+import sys
+from getch import getch
+from . import logs
+
+SELECT = 0
+ABORT = 1
+PREVIOUS = 2
+NEXT = 3
+
+
+def read_actions():
+    """Yields actions for pressed keys."""
+    buffer = []
+    ch = None
+    while True:
+        try:
+            try:
+                ch = getch()
+            except OverflowError:  # Ctrl+C, KeyboardInterrupt will be reraised
+                pass
+        except KeyboardInterrupt:
+            yield ABORT
+
+        if ch in ('\n', '\r'):  # Enter
+            yield SELECT
+
+        buffer.append(ch)
+        buffer = buffer[-3:]
+
+        if buffer == ['\x1b', '[', 'A']:  # ↑
+            yield PREVIOUS
+
+        if buffer == ['\x1b', '[', 'B']:  # ↓
+            yield NEXT
+
+
+class CommandSelector(object):
+    def __init__(self, commands):
+        self._commands = commands
+        self._index = 0
+        self._on_change = lambda x: x
+
+    def next(self):
+        self._index = (self._index + 1) % len(self._commands)
+        self._on_change(self.value)
+
+    def previous(self):
+        self._index = (self._index - 1) % len(self._commands)
+        self._on_change(self.value)
+
+    @property
+    def value(self):
+        return self._commands[self._index]
+
+    def on_change(self, fn):
+        self._on_change = fn
+        fn(self.value)
+
+
+def select_command(corrected_commands, settings):
+    """Returns:
+
+     - the first command when confirmation disabled;
+     - None when ctrl+c pressed;
+     - selected command.
+
+    """
+    if not corrected_commands:
+        logs.failed('No fuck given', settings)
+        return
+
+    selector = CommandSelector(corrected_commands)
+    if not settings.require_confirmation:
+        logs.show_corrected_command(selector.value, settings)
+        return selector.value
+
+    selector.on_change(lambda val: logs.confirm_text(val, settings))
+    for key in read_actions():
+        if key == SELECT:
+            sys.stderr.write('\n')
+            return selector.value
+        elif key == ABORT:
+            logs.failed('\nAborted', settings)
+            return
+        elif key == PREVIOUS:
+            selector.previous()
+        elif key == NEXT:
+            selector.next()