#!/usr/bin/env python
import sys, os, time, getopt
import pty

mode = 'wb'
shell = 'sh'
filename = 'typescript'
if 'SHELL' in os.environ:
    shell = os.environ['SHELL']

try:
    opts, args = getopt.getopt(sys.argv[1:], 'apc:')
except getopt.error as msg:
    print('%s: %s' % (sys.argv[0], msg))
    sys.exit(2)

for opt, arg in opts:
    # option -a: append to typescript file
    if opt == '-a':
        mode = 'ab'
    # option -p: use a Python shell as the terminal command
    elif opt == '-p':
        shell = sys.executable
    # option -c: use the argument to -c as the command
    elif opt == '-c':
        shell = arg 

if args:
    filename = args[0]

script = open(filename, mode)

def read(fd):
    data = os.read(fd, 1024)
    script.write(data)
    return data

if os.isatty(sys.stdin.fileno()):
    pty.spawn(shell, read)
else:
    pty.spawn(shell, read, read)