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#!/usr/bin/env python3
# Dumb full-screen editor. It doesn't save anything but to the screen.
#
# "Why wont python let me read memory
# from screen like assembler? That's dumb." -hellbeard
#
# This program makes example how to deal with a keypad for directional
# movement, with both numlock on and off.
from __future__ import division, print_function
import collections
import functools
from blessed import Terminal
echo = lambda text: (
functools.partial(print, end='', flush=True)(text))
echo_yx = lambda cursor, text: (
echo(cursor.term.move(cursor.y, cursor.x) + text))
Cursor = collections.namedtuple('Point', ('y', 'x', 'term'))
above = lambda csr, n: (
Cursor(y=max(0, csr.y - n),
x=csr.x,
term=csr.term))
below = lambda csr, n: (
Cursor(y=min(csr.term.height - 1, csr.y + n),
x=csr.x,
term=csr.term))
right_of = lambda csr, n: (
Cursor(y=csr.y,
x=min(csr.term.width - 1, csr.x + n),
term=csr.term))
left_of = lambda csr, n: (
Cursor(y=csr.y,
x=max(0, csr.x - n),
term=csr.term))
home = lambda csr: (
Cursor(y=csr.y,
x=0,
term=csr.term))
end = lambda csr: (
Cursor(y=csr.y,
x=csr.term.width - 1,
term=csr.term))
bottom = lambda csr: (
Cursor(y=csr.term.height - 1,
x=csr.x,
term=csr.term))
top = lambda csr: (
Cursor(y=1,
x=csr.x,
term=csr.term))
center = lambda csr: Cursor(
csr.term.height // 2,
csr.term.width // 2,
csr.term)
lookup_move = lambda inp_code, csr, term: {
# arrows, including angled directionals
csr.term.KEY_END: below(left_of(csr, 1), 1),
csr.term.KEY_KP_1: below(left_of(csr, 1), 1),
csr.term.KEY_DOWN: below(csr, 1),
csr.term.KEY_KP_2: below(csr, 1),
csr.term.KEY_PGDOWN: below(right_of(csr, 1), 1),
csr.term.KEY_LR: below(right_of(csr, 1), 1),
csr.term.KEY_KP_3: below(right_of(csr, 1), 1),
csr.term.KEY_LEFT: left_of(csr, 1),
csr.term.KEY_KP_4: left_of(csr, 1),
csr.term.KEY_CENTER: center(csr),
csr.term.KEY_KP_5: center(csr),
csr.term.KEY_RIGHT: right_of(csr, 1),
csr.term.KEY_KP_6: right_of(csr, 1),
csr.term.KEY_HOME: above(left_of(csr, 1), 1),
csr.term.KEY_KP_7: above(left_of(csr, 1), 1),
csr.term.KEY_UP: above(csr, 1),
csr.term.KEY_KP_8: above(csr, 1),
csr.term.KEY_PGUP: above(right_of(csr, 1), 1),
csr.term.KEY_KP_9: above(right_of(csr, 1), 1),
# shift + arrows
csr.term.KEY_SLEFT: left_of(csr, 10),
csr.term.KEY_SRIGHT: right_of(csr, 10),
csr.term.KEY_SDOWN: below(csr, 10),
csr.term.KEY_SUP: above(csr, 10),
# carriage return
csr.term.KEY_ENTER: home(below(csr, 1)),
}.get(inp_code, csr)
def readline(term, width=20):
# a rudimentary readline function
string = u''
while True:
inp = term.inkey()
if inp.code == term.KEY_ENTER:
break
elif inp.code == term.KEY_ESCAPE or inp == chr(3):
string = None
break
elif not inp.is_sequence and len(string) < width:
string += inp
echo(inp)
elif inp.code in (term.KEY_BACKSPACE, term.KEY_DELETE):
string = string[:-1]
echo('\b \b')
return string
def save(screen, fname):
if not fname:
return
with open(fname, 'w') as fp:
cur_row = cur_col = 0
for (row, col) in sorted(screen):
char = screen[(row, col)]
while row != cur_row:
cur_row += 1
cur_col = 0
fp.write(u'\n')
while col > cur_col:
cur_col += 1
fp.write(u' ')
fp.write(char)
cur_col += 1
fp.write(u'\n')
def redraw(term, screen, start=None, end=None):
if start is None and end is None:
echo(term.clear)
start, end = (Cursor(y=min([y for (y, x) in screen or [(0, 0)]]),
x=min([x for (y, x) in screen or [(0, 0)]]),
term=term),
Cursor(y=max([y for (y, x) in screen or [(0, 0)]]),
x=max([x for (y, x) in screen or [(0, 0)]]),
term=term))
lastcol, lastrow = -1, -1
for row, col in sorted(screen):
if (row >= start.y and row <= end.y and
col >= start.x and col <= end.x):
if col >= term.width or row >= term.height:
# out of bounds
continue
if not (row == lastrow and col == lastcol + 1):
# use cursor movement
echo_yx(Cursor(row, col, term), screen[row, col])
else:
# just write past last one
echo(screen[row, col])
def main():
term = Terminal()
csr = Cursor(0, 0, term)
screen = {}
with term.hidden_cursor(), \
term.raw(), \
term.location(), \
term.fullscreen(), \
term.keypad():
inp = None
while True:
echo_yx(csr, term.reverse(screen.get((csr.y, csr.x), u' ')))
inp = term.inkey()
if inp == chr(3):
# ^c exits
break
elif inp == chr(19):
# ^s saves
echo_yx(home(bottom(csr)),
term.ljust(term.bold_white('Filename: ')))
echo_yx(right_of(home(bottom(csr)), len('Filename: ')), u'')
save(screen, readline(term))
echo_yx(home(bottom(csr)), term.clear_eol)
redraw(term=term, screen=screen,
start=home(bottom(csr)),
end=end(bottom(csr)))
continue
elif inp == chr(12):
# ^l refreshes
redraw(term=term, screen=screen)
n_csr = lookup_move(inp.code, csr, term)
if n_csr != csr:
# erase old cursor,
echo_yx(csr, screen.get((csr.y, csr.x), u' '))
csr = n_csr
elif not inp.is_sequence and inp.isprintable():
echo_yx(csr, inp)
screen[(csr.y, csr.x)] = inp.__str__()
n_csr = right_of(csr, 1)
if n_csr == csr:
# wrap around margin
n_csr = home(below(csr, 1))
csr = n_csr
if __name__ == '__main__':
main()
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