94 lines
3.3 KiB
Python
94 lines
3.3 KiB
Python
# Copyright 2010-2011 Florent Le Coz <louiz@louiz.org>
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#
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# This file is part of Poezio.
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#
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# Poezio is free software: you can redistribute it and/or modify
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# it under the terms of the zlib license. See the COPYING file.
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"""
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Functions to interact with the keyboard
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Mainly, read keys entered and return a string (most
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of the time ONE char, but may be longer if it's a keyboard
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shortcut, like ^A, M-a or KEY_RESIZE)
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"""
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def get_next_byte(s):
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"""
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Read the next byte of the utf-8 char
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ncurses seems to return a string of the byte
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encoded in latin-1. So what we get is NOT what we typed
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unless we do the conversion…
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"""
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try:
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c = s.getkey()
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except:
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return (None, None)
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if len(c) >= 4:
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return (None, c)
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return (ord(c), c.encode('latin-1')) # returns a number and a bytes object
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def read_char(s, timeout=1000):
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"""
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Read one utf-8 char
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see http://en.wikipedia.org/wiki/UTF-8#Description
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"""
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s.timeout(timeout) # The timeout for timed events to be checked every second
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ret_list = []
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# The list of all chars. For example if you paste a text, the list the chars pasted
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# so that they can be handled at once.
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(first, char) = get_next_byte(s)
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while first is not None or char is not None:
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if not isinstance(first, int): # Keyboard special, like KEY_HOME etc
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return [char]
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if first == 127 or first == 8:
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return ["KEY_BACKSPACE"]
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s.timeout(0) # we are now getting the missing utf-8 bytes to get a whole char
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if first < 127: # ASCII char on one byte
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if first <= 26: # transform Ctrl+* keys
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char = chr(first + 64)
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ret_list.append("^"+char)
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(first, char) = get_next_byte(s)
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continue
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if first == 27:
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second = read_char(s, 0)
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if second is None: # if escape was pressed, a second char
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# has to be read. But it timed out.
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return None
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res = 'M-%s' % (second[0],)
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ret_list.append(res)
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(first, char) = get_next_byte(s)
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continue
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if 194 <= first:
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(code, c) = get_next_byte(s) # 2 bytes char
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char += c
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if 224 <= first:
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(code, c) = get_next_byte(s) # 3 bytes char
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char += c
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if 240 <= first:
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(code, c) = get_next_byte(s) # 4 bytes char
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char += c
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try:
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ret_list.append(char.decode('utf-8')) # return all the concatened byte objets, decoded
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except UnicodeDecodeError:
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return None
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# s.timeout(1) # timeout to detect a paste of many chars
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(first, char) = get_next_byte(s)
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if not ret_list:
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# nothing at all was read, that’s a timed event timeout
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return None
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if len(ret_list) != 1:
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if ret_list[-1] == '^M':
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ret_list.pop(-1)
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return [char if char != '^M' else '^J' for char in ret_list]
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return ret_list
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if __name__ == '__main__':
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import curses
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s = curses.initscr()
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curses.curs_set(1)
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curses.noecho()
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curses.nonl()
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s.keypad(True)
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curses.noecho()
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while True:
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s.addstr('%s\n' % read_char(s))
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