#!/usr/bin/env python
#these import statements are just "files" that get imported
import subprocess
import optparse

#Create variables out of shell commands
#Note triple quotes can embed Bash

#If you want to add another command just uncomment all of the REPLACE ME sections
#REPLACE ME
#TAIL="""tail /var/log/messages"""

#Determines Home Directory Usage in Gigs
HOMEDIR_USAGE = """
du -sh $HOME | cut -f1
"""

#Determines IP Address
IPADDR = """
/sbin/ifconfig -a | awk '/(cast)/ { print $2 }' | cut -d':' -f2 | head -1
"""

#This function takes Bash commands and returns them
def runBash(cmd):
    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
    out = p.stdout.read().strip()
    return out  #This is the stdout from the shell command

VERBOSE=False
def report(output,cmdtype="UNIX COMMAND:"):
    #Notice the global statement allows input from outside of function
    if VERBOSE:
        print "%s: %s" % (cmdtype, output)
    else:
        print output

#Function to controll option parsing in Python
def controller():
    global VERBOSE
    #Create instance of OptionParser Module, included in Standard Library
    p = optparse.OptionParser(description='A unix toolbox powered by Python',
                                            prog='py4sa',
                                            version='py4sa 0.1',
                                            usage= '%prog [option]')
    p.add_option('--ip','-i', action="store_true", help='gets current IP Address')
    #REPLACE ME
    #p.add_option('--tail', '-t', action="store_true", help='reports tail of system log')
    p.add_option('--usage', '-u', action="store_true", help='gets disk usage of homedir')
    p.add_option('--verbose', '-v',
                action = 'store_true',
                help='prints verbosely',
                default=False)

    #Option Handling passes correct parameter to runBash
    options, arguments = p.parse_args()
    if options.verbose:
        VERBOSE=True
    if options.ip:
        value = runBash(IPADDR)
        report(value,"IPADDR")
    elif options.usage:
        value = runBash(HOMEDIR_USAGE)
        report(value, "HOMEDIR_USAGE")
    #REPLACE ME. This one is tricky notice options.tail corresponds to option
    #elif options.tail:
    #    value = runBash(TAIL)
    #    report(value, "TAIL")
    else:
        p.print_help()

#Runs all the functions
def main():
    controller()

#This idiom means the below code only runs when executed from command line
if __name__ == '__main__':
    main()