# Demnstrate how to handle options, especially command line options
#
# Matt Bishop, MHI 289I, Fall 2025
#
import getopt
import sys

#
# first, using just strings
#
# idea: options are
# -a
# -b
# -c something
# -d something
# anything else is an argument
#
args = ['-a', '-b', '-cfoo', '-d', 'bar', 'a1', 'a2']
print("Argument list:", args)
optlist, arglist = getopt.getopt(args, 'abc:d:')
print("The options and their arguments are:\n\t", optlist)
print("The arguments to the command are:\n\t", arglist)

#
# now let's introduce an error:
# same thing but with -x:
#
print("\nNow introducing '-x' as an option, but not including it in getopt")
args = [ '-x', '-a', '-b', '-d', 'bar', 'a1', 'a2']
print("Argument list:", args)

try:
    optlist, arglist = getopt.getopt(args, 'abc:d:')
except getopt.GetoptError as msg:
    print("Option error:", msg)

print("The options and their arguments are:\n\t", optlist)
print("The arguments to the command are:\n\t", arglist)

#
# now let's introduce an error:
# same thing but with -x *and* -y:
#
print("\nNow using '-x' and '-y' as options, but not including them in getopt")
args = [ '-x', '-y', '-a', '-b', '-cfoo', '-d', 'bar', 'a1', 'a2']
print("Argument list:", args)

try:
    optlist, arglist = getopt.getopt(args, 'abc:d:')
except getopt.GetoptError as msg:
    print("Option error:", msg)

print("The options and their arguments are:\n\t", optlist)
print("The arguments to the command are:\n\t", arglist)
print("Note the '-y' option is silently ignored")

#
# now define them from the environment
#
print("\nNow from the command line:")
print("Argument list:", sys.argv[1:])

try:
    optlist, arglist = getopt.getopt(sys.argv[1:], 'abc:d:')
except getopt.GetoptError as msg:
    print("Option error:", msg)

print("The options and their arguments are:\n\t", optlist)
print("The arguments to the command are:\n\t", arglist)