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# Copyright 2010 Le Coz Florent <louizatakk@fedoraproject.org>
#
# This file is part of Poezio.
#
# Poezio is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# Poezio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Poezio. If not, see <http://www.gnu.org/licenses/>.
"""
Functions to interact with the keyboard
Mainly, read keys entered and return a string (most
of the time ONE char, but may be longer if it's a keyboard
shortcut, like ^A, M-a or KEY_RESIZE)
"""
def get_next_byte(s):
"""
Read the next byte of the utf-8 char
ncurses seems to return a string of the byte
encoded in latin-1. So what we get is NOT what we typed
unless we do the conversion…
"""
try:
c = s.getkey()
except:
return (None, "KEY_RESIZE")
if len(c) >= 4:
return (None, c)
return (ord(c), c.encode('latin-1')) # returns a number and a bytes object
def read_char(s):
"""
Read one utf-8 char
see http://en.wikipedia.org/wiki/UTF-8#Description
"""
(first, char) = get_next_byte(s)
if not isinstance(first, int): # Keyboard special, like KEY_HOME etc
return char
if first == 127 or first == 8:
return "KEY_BACKSPACE"
if first < 127: # ASCII char on one byte
if first <= 26: # transform Ctrl+* keys
return "^"+chr(first + 64)
if first == 27:
(first, c) = get_next_byte(s)
if not isinstance(first, int): # Keyboard special, like KEY_HOME etc
return char
return "M-"+chr(first)
if 194 <= first:
(code, c) = get_next_byte(s) # 2 bytes char
char += c
if 224 <= first:
(code, c) = get_next_byte(s) # 3 bytes char
char += c
if 240 <= first:
(code, c) = get_next_byte(s) # 4 bytes char
char += c
try:
return char.decode('utf-8') # return all the concatened byte objets, decoded
except UnicodeDecodeError:
return None
if __name__ == '__main__':
import curses
s = curses.initscr()
curses.noecho()
while True:
s.addstr('%s\n' % read_char(s))
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