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#!/usr/bin/env python

# Program to draw separators between commands
# I made this because I often type commands which have many pages of
# output. The separators make it easy to see where the command started.

# Pass -n as the first argument to print a banner and not actually
# execute the command.

# Dependencies:
#   ansicolors (https://pypi.org/project/ansicolors)

# Author: David McClosky
# Homepage: http://zorglish.org
# Code: http://github.com/dmcc

import sys, os
import colors

# lifted from http://pdos.csail.mit.edu/~cblake/cls/cls.py
# --------------------------------------------------------
env = os.environ

def ioctl_GWINSZ(fd):                  #### TABULATION FUNCTIONS
    try:                                ### Discover terminal width
        import fcntl, termios, struct, os
        cr = struct.unpack('hh', fcntl.ioctl(fd, termios.TIOCGWINSZ, '1234'))
    except:
        return None
    return cr

def terminal_size():                    ### decide on *some* terminal size
    cr = ioctl_GWINSZ(0) or ioctl_GWINSZ(1) or ioctl_GWINSZ(2)  # try open fds
    if not cr:                                                  # ...then ctty
        try:
            fd = os.open(os.ctermid(), os.O_RDONLY)
            cr = ioctl_GWINSZ(fd)
            os.close(fd)
        except:
            pass
    if not cr:                            # env vars or finally defaults
        try:
            cr = (env['LINES'], env['COLUMNS'])
        except:
            cr = (25, 80)
    return int(cr[1]), int(cr[0])         # reverse rows, cols
# --------------------------------------------------------

termwidth, termheight = terminal_size()
symbol = '#'

# Very basic option parsing.
args = sys.argv[1:]
if args and args[0] == '-n':
    run_command = False
    args.pop(0)
else:
    run_command = True

command = ' ' + ' '.join(args) + ' '
if not command.strip():
    command = ''
command_len = len(command)
remaining = termwidth - command_len

bar = colors.color(symbol * termwidth, fg='red')
left = symbol * (remaining // 2)
right = left
# if odd number of characters, put the extra # on the right
if remaining % 2 == 1:
    right += symbol

print(bar)
print(''.join((colors.color(left, fg='red'),
               colors.color(command, style='bold'),
               colors.color(right, fg='red'))))
print(bar)

if command and run_command:
    sys.exit(os.system(command))