nvbn
103 lines
2.4 KiB
Python
103 lines
2.4 KiB
Python
# -*- encoding: utf-8 -*-
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import sys
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from . import logs
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try:
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from msvcrt import getch
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except ImportError:
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def getch():
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import tty
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import termios
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fd = sys.stdin.fileno()
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old = termios.tcgetattr(fd)
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try:
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tty.setraw(fd)
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ch = sys.stdin.read(1)
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if ch == '\x03': # For compatibility with msvcrt.getch
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raise KeyboardInterrupt
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return ch
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finally:
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termios.tcsetattr(fd, termios.TCSADRAIN, old)
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SELECT = 0
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ABORT = 1
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PREVIOUS = 2
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NEXT = 3
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def read_actions():
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"""Yields actions for pressed keys."""
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buffer = []
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while True:
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try:
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ch = getch()
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except KeyboardInterrupt: # Ctrl+C
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yield ABORT
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if ch in ('\n', '\r'): # Enter
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yield SELECT
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buffer.append(ch)
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buffer = buffer[-3:]
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if buffer == ['\x1b', '[', 'A']: # ↑
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yield PREVIOUS
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elif buffer == ['\x1b', '[', 'B']: # ↓
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yield NEXT
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class CommandSelector(object):
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def __init__(self, commands):
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self._commands = commands
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self._index = 0
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self._on_change = lambda x: x
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def next(self):
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self._index = (self._index + 1) % len(self._commands)
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self._on_change(self.value)
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def previous(self):
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self._index = (self._index - 1) % len(self._commands)
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self._on_change(self.value)
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@property
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def value(self):
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return self._commands[self._index]
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def on_change(self, fn):
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self._on_change = fn
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fn(self.value)
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def select_command(corrected_commands, settings):
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"""Returns:
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- the first command when confirmation disabled;
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- None when ctrl+c pressed;
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- selected command.
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"""
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if not corrected_commands:
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logs.failed('No fucks given', settings)
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return
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selector = CommandSelector(corrected_commands)
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if not settings.require_confirmation:
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logs.show_corrected_command(selector.value, settings)
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return selector.value
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selector.on_change(lambda val: logs.confirm_text(val, settings))
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for action in read_actions():
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if action == SELECT:
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sys.stderr.write('\n')
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return selector.value
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elif action == ABORT:
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logs.failed('\nAborted', settings)
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return
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elif action == PREVIOUS:
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selector.previous()
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elif action == NEXT:
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selector.next()
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