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#!/usr/bin/python
#
# Block header comment
#
#
import sys, imp, atexit
sys.path.append("/home/courses/cs3214/software/pexpect-dpty/");
import pexpect, shellio, signal, time, os, re, proc_check

#Ensure the shell process is terminated
def force_shell_termination(shell_process):
        c.close(force=True)

#pulling in the regular expression and other definitions
definitions_scriptname = sys.argv[1]
def_module = imp.load_source('', definitions_scriptname)
logfile = None
if hasattr(def_module, 'logfile'):
    logfile = def_module.logfile

#spawn an instance of the shell
c = pexpect.spawn(def_module.shell, drainpty=True, logfile=logfile)
atexit.register(force_shell_termination, shell_process=c)


# set timeout for all following 'expect*' calls to 2 seconds
c.timeout = 2

# ensure that shell prints expected prompt
assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"

# save a string to a file
c.sendline("echo This is a test message > testfile")

# ensure that the shell prints the expected prompt
assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"

# append a string to the file
c.sendline("echo This is another message >> testfile")

# ensure that the shell prints the expected prompt
assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"

# print out contents of said file
c.sendline("cat testfile")

# check if correct string was written
assert c.expect("This is a test message\r\nThis is another message") == 0, \
        "Shell did not print expected output"

# remove tmp file
c.sendline("rm testfile")

c.sendline("exit");
assert c.expect_exact("exit\r\n") == 0, "Shell output extraneous characters"


shellio.success()