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"""Console helpers for pippy."""
# Copyright (C) 2007,2008,2010 One Laptop per Child Association, Inc.
# Written by C. Scott Ananian <cscott@laptop.org>
#
# This program 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; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import sys
import os
import tty
import termios
def clear():
"""Clear screen on console."""
# magic escape sequence
sys.stdout.write('\x1B[H\x1B[J')
def size():
"""Return the number of rows/columns in the current terminal widget."""
# xterm magic! see http://rtfm.etla.org/xterm/ctlseq.html
fd = os.open('/dev/tty', os.O_RDWR | os.O_APPEND)
def read_to_delimit(delimit):
buf = []
while True:
c = os.read(fd, 1)
if c == delimit:
break
buf.append(c)
return b''.join(buf)
oldattr = termios.tcgetattr(fd) # make sure we can restore tty state
tty.setraw(fd, termios.TCSANOW) # set to raw mode.
os.write(fd, b'\x1B[18t') # write the 'query screen size' command
read_to_delimit(b'\x1b') # parse response.
read_to_delimit(b'[')
size = read_to_delimit(b't')
# Output can be '8;rows;cols' or 'rows;cols' depending on vte version.
# (SL #843)
values = size.split(b';')
if len(values) == 3:
rows = int(values[1])
cols = int(values[2])
else:
rows = int(values[0])
cols = int(values[1])
termios.tcsetattr(fd, termios.TCSANOW, oldattr) # reset tty
return cols, rows
def getpos():
"""Return the current x, y position of the cursor on the screen.
The top-left corner is 1,1."""
# xterm magic! see http://rtfm.etla.org/xterm/ctlseq.html
sys.stdout.flush() # ensure that writes to the terminal have finished
fd = os.open('/dev/tty', os.O_RDWR | os.O_APPEND)
def read_to_delimit(delimit):
buf = []
while True:
c = os.read(fd, 1)
if c == delimit:
break
buf.append(c)
return b''.join(buf)
oldattr = termios.tcgetattr(fd) # make sure we can restore tty state
tty.setraw(fd, termios.TCSANOW) # set to raw mode.
os.write(fd, b'\x1B[6n') # Report Cursor Position
read_to_delimit(b'\x1b') # parse response.
read_to_delimit(b'[')
row = int(read_to_delimit(b';'))
col = int(read_to_delimit(b'R'))
termios.tcsetattr(fd, termios.TCSANOW, oldattr) # reset tty
return col, row
def setpos(column, row):
"""Move to the given position on the screen.
The top-left corner is 1,1"""
# xterm magic! see http://rtfm.etla.org/xterm/ctlseq.html
sys.stdout.write('\x1B[%d;%dH' % (row, column))
def up(count=1):
"""Move the cursor up the given number of rows."""
sys.stdout.write('\x1B[%dA' % count)
def down(count=1):
"""Move the cursor down the given number of rows."""
sys.stdout.write('\x1B[%dB' % count)
def forward(count=1):
"""Move the cursor forward the given number of columns."""
sys.stdout.write('\x1B[%dC' % count)
def backward(count=1):
"""Move the cursor backward the given number of columns."""
sys.stdout.write('\x1B[%dD' % count)
def normal():
"""Switch to normal text."""
sys.stdout.write('\x1B[0m')
def bold():
"""Switch to bold text."""
sys.stdout.write('\x1B[1m')
def underlined():
"""Switch to underlined text."""
sys.stdout.write('\x1B[4m')
def inverse():
"""Switch to inverse text."""
sys.stdout.write('\x1B[7m')
def black():
"""Change text color to black."""
# magic escape sequence.
sys.stdout.write('\x1B[30m')
def red():
"""Change text color to red."""
# magic escape sequence.
sys.stdout.write('\x1B[31m')
def green():
"""Change text color to green."""
# magic escape sequence.
sys.stdout.write('\x1B[32m')
def yellow():
"""Change text color to yellow."""
# magic escape sequence.
sys.stdout.write('\x1B[33m')
def blue():
"""Change text color to blue."""
# magic escape sequence.
sys.stdout.write('\x1B[34m')
def magenta():
"""Change text color to magenta."""
# magic escape sequence.
sys.stdout.write('\x1B[35m')
def cyan():
"""Change text color to cyan."""
# magic escape sequence.
sys.stdout.write('\x1B[36m')
def white():
"""Change text color to white."""
# magic escape sequence.
sys.stdout.write('\x1B[37m')
def hide_cursor():
"""Hide the cursor."""
sys.stdout.write('\x1B[?25l')
def show_cursor():
"""Show the cursor."""
sys.stdout.write('\x1B[?25h')
def reset():
"""Clear screen and reset text color."""
clear()
show_cursor()
sys.stdout.write('\x1B[0;39m')
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