#----------------------------------------------------------------------
# Simple command processor.
#
# (C) March 5, 2018 -- Dr. William T. Verts
#
# New things:
#
# (1) Multiline strings.  Use of """......""" or '''......''' allows
# the string to span lines, and will include the line breaks as part
# of the string.
#
# (2) Use of a Boolean (bool) to control the while loop.  The loop
# will run until the variable MoreToDo becomes false, which is one
# of the user commands.
#
# (3) Capitalizing the string.  This requires the string.upper
# function, found in the string library.  We must import the
# string library.  By capitalizing the string, it allows the user
# to be sloppy about case on data-entry, and the program will adapt.
#
# (4) if-elif-else network and pass.  We set up the tests for all the
# commands we expect to eventually implement, but those we haven't
# gotten to yet can be faked with the pass statement.  When we get
# around to writing the code, the pass will be replaced with the
# correct functionality.
#
# (5) JES Input/Output.  In pure Python we would use raw_input and
# print, but in JES we can use requestString and showError instead.
#----------------------------------------------------------------------

import string

def Main():
    Message = """Enter a Command
from the list:
QUIT INPUT PRINT
SAVE BRIGHTEN DARKEN
FOCUS EMBOSS CONTRAST
Enter a command --- """

    MoreToDo = True
    while (MoreToDo):
        S = string.upper(requestString(Message))
        print S
        if   (S == "QUIT"    ): MoreToDo = False
        elif (S == "INPUT"   ): pass
        elif (S == "PRINT"   ): pass
        elif (S == "SAVE"    ): pass
        elif (S == "BRIGHTEN"): pass
        elif (S == "DARKEN"  ): pass
        else: showError("ERROR, " + S + " is not a legal command")    
    return