82 lines
1.8 KiB
Python
82 lines
1.8 KiB
Python
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#!/usr/bin/env python
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import sys
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import termios
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import atexit
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from select import select
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STDIN_FD = sys.stdin.fileno()
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class KBHit:
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def __init__(self) -> None:
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''' Creates a KBHit object that you can call to do various keyboard things.
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'''
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self.set_kbhit_terminal()
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def set_kbhit_terminal(self) -> None:
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''' Save old terminal settings for closure, remove ICANON & ECHO flags.
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'''
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# Save the terminal settings
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self.old_term = termios.tcgetattr(STDIN_FD)
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self.new_term = self.old_term.copy()
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# New terminal setting unbuffered
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self.new_term[3] &= ~(termios.ICANON | termios.ECHO)
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termios.tcsetattr(STDIN_FD, termios.TCSAFLUSH, self.new_term)
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# Support normal-terminal reset at exit
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atexit.register(self.set_normal_term)
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def set_normal_term(self) -> None:
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''' Resets to normal terminal. On Windows this is a no-op.
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'''
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termios.tcsetattr(STDIN_FD, termios.TCSAFLUSH, self.old_term)
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@staticmethod
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def getch() -> str:
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''' Returns a keyboard character after kbhit() has been called.
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Should not be called in the same program as getarrow().
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'''
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return sys.stdin.read(1)
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@staticmethod
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def getarrow() -> int:
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''' Returns an arrow-key code after kbhit() has been called. Codes are
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0 : up
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1 : right
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2 : down
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3 : left
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Should not be called in the same program as getch().
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'''
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c = sys.stdin.read(3)[2]
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vals = [65, 67, 66, 68]
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return vals.index(ord(c))
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@staticmethod
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def kbhit():
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''' Returns True if keyboard character was hit, False otherwise.
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'''
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return select([sys.stdin], [], [], 0)[0] != []
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# Test
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if __name__ == "__main__":
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kb = KBHit()
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print('Hit any key, or ESC to exit')
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while True:
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if kb.kbhit():
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c = kb.getch()
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if c == '\x1b': # ESC
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break
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print(c)
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kb.set_normal_term()
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