#414: Move system-dependent utils in system module

tests/test_ui.py

@@ -4,37 +4,32 @@ import pytest
 from itertools import islice
 from thefuck import ui
 from thefuck.types import CorrectedCommand
+from thefuck import const
 
 
 @pytest.fixture
-def patch_getch(monkeypatch):
+def patch_get_key(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))
+        vals = iter(vals)
+        monkeypatch.setattr('thefuck.ui.get_key', lambda: next(vals))
 
     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], )
+def test_read_actions(patch_get_key):
+    patch_get_key([
+        # Enter:
+        '\n',
+        # Enter:
+        '\r',
+        # Ignored:
+        'x', 'y',
+        # Up:
+        const.KEY_UP,
+        # Down:
+        const.KEY_DOWN,
+        # Ctrl+C:
+        const.KEY_CTRL_C])
     assert list(islice(ui.read_actions(), 5)) \
            == [ui.SELECT, ui.SELECT, ui.PREVIOUS, ui.NEXT, ui.ABORT]
 
@@ -80,25 +75,25 @@ class TestSelectCommand(object):
                == commands_with_side_effect[0]
         assert capsys.readouterr() == ('', 'ls (+side effect)\n')
 
-    def test_with_confirmation(self, capsys, patch_getch, commands):
-        patch_getch(['\n'])
+    def test_with_confirmation(self, capsys, patch_get_key, commands):
+        patch_get_key(['\n'])
         assert ui.select_command(iter(commands)) == commands[0]
         assert capsys.readouterr() == ('', u'\x1b[1K\rls [enter/↑/↓/ctrl+c]\n')
 
-    def test_with_confirmation_abort(self, capsys, patch_getch, commands):
-        patch_getch([KeyboardInterrupt])
+    def test_with_confirmation_abort(self, capsys, patch_get_key, commands):
+        patch_get_key([const.KEY_CTRL_C])
         assert ui.select_command(iter(commands)) is None
         assert capsys.readouterr() == ('', u'\x1b[1K\rls [enter/↑/↓/ctrl+c]\nAborted\n')
 
-    def test_with_confirmation_with_side_effct(self, capsys, patch_getch,
+    def test_with_confirmation_with_side_effct(self, capsys, patch_get_key,
                                                commands_with_side_effect):
-        patch_getch(['\n'])
-        assert ui.select_command(iter(commands_with_side_effect))\
+        patch_get_key(['\n'])
+        assert ui.select_command(iter(commands_with_side_effect)) \
                == commands_with_side_effect[0]
         assert capsys.readouterr() == ('', u'\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'])
+    def test_with_confirmation_select_second(self, capsys, patch_get_key, commands):
+        patch_get_key([const.KEY_DOWN, '\n'])
         assert ui.select_command(iter(commands)) == commands[1]
         assert capsys.readouterr() == (
             '', u'\x1b[1K\rls [enter/↑/↓/ctrl+c]\x1b[1K\rcd [enter/↑/↓/ctrl+c]\n')

thefuck/const.py

@@ -0,0 +1,14 @@
+# -*- encoding: utf-8 -*-
+
+
+class _GenConst(object):
+    def __init__(self, name):
+        self._name = name
+
+    def __repr__(self):
+        return u'<const: {}>'.format(self._name)
+
+
+KEY_UP = _GenConst('↑')
+KEY_DOWN = _GenConst('↓')
+KEY_CTRL_C = _GenConst('Ctrl+C')

thefuck/main.py

@@ -2,27 +2,18 @@ from argparse import ArgumentParser
 from warnings import warn
 from pprint import pformat
 import sys
-import colorama
 from . import logs, types, shells
 from .conf import settings
 from .corrector import get_corrected_commands
 from .exceptions import EmptyCommand
 from .utils import get_installation_info
 from .ui import select_command
-
-
-def init_colorama():
-    if sys.platform == 'win32':
-        #  https://github.com/tartley/colorama/issues/32
-        import win_unicode_console
-
-        win_unicode_console.enable()
-    colorama.init()
+from .system import init_output
 
 
 def fix_command():
     """Fixes previous command. Used when `thefuck` called without arguments."""
-    init_colorama()
+    init_output()
     settings.init()
     with logs.debug_time('Total'):
         logs.debug(u'Run with settings: {}'.format(pformat(settings)))
@@ -60,7 +51,7 @@ def how_to_configure_alias():
     It'll be only visible when user type fuck and when alias isn't configured.
 
     """
-    init_colorama()
+    init_output()
     settings.init()
     logs.how_to_configure_alias(shells.how_to_configure())
 

thefuck/system/__init__.py

@@ -0,0 +1,7 @@
+import sys
+
+
+if sys.platform == 'win32':
+    from .win32 import *
+else:
+    from .unix import *

thefuck/system/unix.py

@@ -0,0 +1,35 @@
+import sys
+import tty
+import termios
+import colorama
+from .. import const
+
+init_output = colorama.init
+
+
+def getch():
+    fd = sys.stdin.fileno()
+    old = termios.tcgetattr(fd)
+    try:
+        tty.setraw(fd)
+        return sys.stdin.read(1)
+    finally:
+        termios.tcsetattr(fd, termios.TCSADRAIN, old)
+
+
+def get_key():
+    ch = getch()
+
+    if ch == '\x03':
+        return const.KEY_CTRL_C
+    elif ch == '\x1b':
+        next_ch = getch()
+        if next_ch == '[':
+            last_ch = getch()
+
+            if last_ch == 'A':
+                return const.KEY_UP
+            elif last_ch == 'B':
+                return const.KEY_DOWN
+
+    return ch

thefuck/system/win32.py

@@ -0,0 +1,25 @@
+import sys
+import msvcrt
+import colorama
+import win_unicode_console
+from .. import const
+
+
+def init_output():
+    win_unicode_console.enable()
+    colorama.init()
+
+
+def get_key():
+    ch = msvcrt.getch()
+    if ch in (b'\x00', b'\xe0'):  # arrow or function key prefix?
+        ch = msvcrt.getch()  # second call returns the actual key code
+
+    if ch == b'\x03':
+        raise const.KEY_CTRL_C
+    if ch == b'H':
+        return const.KEY_UP
+    if ch == b'P':
+        return const.KEY_DOWN
+
+    return ch.decode(sys.stdout.encoding)

thefuck/ui.py

@@ -3,38 +3,8 @@
 import sys
 from .conf import settings
 from .exceptions import NoRuleMatched
-from . import logs
-
-try:
-    import msvcrt
-
-    def getch():
-        ch = msvcrt.getch()
-        if ch in (b'\x00', b'\xe0'):  # arrow or function key prefix?
-            ch = msvcrt.getch()  # second call returns the actual key code
-
-        if ch == b'\x03':
-            raise KeyboardInterrupt
-        if ch == b'H':
-            return 'k'
-        if ch == b'P':
-            return 'j'
-        return ch.decode(sys.stdout.encoding)
-except ImportError:
-    def getch():
-        import tty
-        import termios
-
-        fd = sys.stdin.fileno()
-        old = termios.tcgetattr(fd)
-        try:
-            tty.setraw(fd)
-            ch = sys.stdin.read(1)
-            if ch == '\x03':  # For compatibility with msvcrt.getch
-                raise KeyboardInterrupt
-            return ch
-        finally:
-            termios.tcsetattr(fd, termios.TCSADRAIN, old)
+from .system import get_key
+from . import logs, const
 
 SELECT = 0
 ABORT = 1
@@ -44,23 +14,17 @@ NEXT = 3
 
 def read_actions():
     """Yields actions for pressed keys."""
-    buffer = []
     while True:
-        try:
-            ch = getch()
-        except KeyboardInterrupt:  # Ctrl+C
-            yield ABORT
+        key = get_key()
 
-        if ch in ('\n', '\r'):  # Enter
-            yield SELECT
-
-        buffer.append(ch)
-        buffer = buffer[-3:]
-
-        if buffer == ['\x1b', '[', 'A'] or ch == 'k':  # ↑
+        if key in (const.KEY_UP, 'k'):
             yield PREVIOUS
-        elif buffer == ['\x1b', '[', 'B'] or ch == 'j':  # ↓
+        elif key in (const.KEY_DOWN, 'j'):
             yield NEXT
+        elif key == const.KEY_CTRL_C:
+            yield ABORT
+        elif key in ('\n', '\r'):
+            yield SELECT
 
 
 class CommandSelector(object):