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#!/usr/bin/python

#

# jobs_test: tests the jobs command

# 

# Test the jobs command for status messages and proper output

# of the command and jobid.  Requires the following commands to be implemented

# or otherwise usable:

#

#	jobs, ctrl-z control, ctrl-c control, sleep, fg, clear

#

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 bash.  PS1 is the env variable from which bash

# draws its prompt

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"

#check that the jobs list outputs nothing

c.sendline(def_module.builtin_commands['jobs'])

# ensure that shell prints expected prompt

assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"

# run a command

c.sendline("sleep 30")

#Wait until the sleep command takes over the foreground

proc_check.wait_until_child_is_in_foreground(c)

#send the job to the background

c.sendcontrol('z')

# ensure that the shell prints the expected prompt

assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"

#Request the jobs list

c.sendline(def_module.builtin_commands['jobs'])

#Check the jobs list

(jobid, status_message, command_line) = shellio.parse_regular_expression(c, def_module.job_status_regex)

assert status_message == def_module.jobs_status_msg['stopped'] and \

		'sleep 30' in command_line, "Job status not properly displayed"

# ensure that the shell prints the expected prompt

assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"

#Add another job

c.sendline("sleep 300 &")

# pick up the background job output

(jobid, pid) = shellio.parse_regular_expression(c, def_module.bgjob_regex)

assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"

#Both jobs need to be active and running before the jobs command is

#sent.  if this isn't so, the test is failed.

proc_check.count_active_children(c, 2)

#Recheck the jobs list

c.sendline(def_module.builtin_commands['jobs'])

#Check the jobs list

(jobid, status_message, command_line) = \

            shellio.parse_regular_expression(c, def_module.job_status_regex) 

(jobid2, status_message2, command_line2) = \

            shellio.parse_regular_expression(c, def_module.job_status_regex)

# Check that the jobs list contains both jobs in some order

#check the first possible order of job statuses, and then

#the second possible order.

assert  (status_message == def_module.jobs_status_msg['stopped'] and \

		'sleep 30' in command_line and \

		\

		status_message2 == def_module.jobs_status_msg['running'] and \

		'sleep 300' in command_line2) \

		\

		or \

		\

		(status_message2 == def_module.jobs_status_msg['stopped'] and \

		'sleep 30' in command_line2 and \

		\

		status_message == def_module.jobs_status_msg['running'] and \

		'sleep 300' in command_line), "Job status not properly displayed"

# Check that there are no duplicate job id's.

assert jobid != jobid2, "Duplicate job id's."

assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"

#bring the second sleep command back to foreground 

#so that we can end it with ctrl-c

c.sendline(def_module.builtin_commands['fg'] % jobid2)

#Wait until the sleep command takes over the foreground

proc_check.wait_until_child_is_in_foreground(c)

#ctrl-c to close the process

c.sendintr()

#clear any printout of the old job that was just killed by ctrl-c

c.sendline(def_module.builtin_commands['jobs'])

#check the prompt and move past this text

assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"

#check the prompt and move past this text

assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"

#check the jobs list

c.sendline(def_module.builtin_commands['jobs'])

#check that the first job is still on the jobs list

assert (jobid, status_message, command_line) == \

    shellio.parse_regular_expression(c, def_module.job_status_regex), \

    "The original job was not displayed properly after ending a previous job."

# ensure the prompt is printed

assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"

# exit

c.sendline("exit");

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

shellio.success()