class ShellInterface:
"""Class for a very simple shell interface."""
shellname = "Adventure Core Testing Shell ver. NaN"
initmessage = """\
Copyright (c) 2011 Dylan Nugent. All Rights Reserved.
This program is licensed freely under the NCSA license.
Source code is available, and a copy of the license should be included.
"""
initmessage = textwrap.dedent(initmessage)
prompt = "command> "
case_insensitive = True
command_list = {}
alias_list = {}
def __init__(self):
"""Initializes the shell interface.
Loads shell builtins and prints the initialization (welcome)
message for the shell.
"""
print(self.shellname)
print(self.initmessage)
if DEBUG:
print("Debug mode is active. Bumpy road ahead.")
self.load()
self.running = False
def run(self):
"""Begins running the shell interface.
Note that this will take over an application until run terminates.
"""
self.running = True
while(self.running):
indata = self.get_command()
try:
self.process_command(indata)
except NotImplementedError:
print("Error: Command not yet implemented")
except KeyError as e:
print("Error: {}".format(e))
def load(self):
"""Load up the commands for the shell interface."""
# TODO: Come up with a better way to do this than hardcoded commands
self.command_list["help"] = "Display this help message"
self.command_list["quit"] = "Exit the shell"
self.command_list["load"] = "Load an Adventure Core game into the shell"
self.alias_list["q"] = "quit"
self.alias_list["exit"] = "quit"
self.currgame = None
def get_command(self):
"""Display a shell prompt and get the command from it"""
command = input(self.prompt)
if self.case_insensitive:
command = command.lower()
return command
def process_command(self, linein):
"""Process a command on the active shell
Arguments:
linein - The command to be processed
"""
# For now, it's a hard coded limitation that a command must be
# distinguished by its first word alone, and all following data
# is to be treated as an argument to the command
command = linein.split()[0]
args = linein.split()[1:]
if(command in self.alias_list):
command = self.alias_list[command]
if(command in self.command_list):
# Process the command, currently manual
if(command == "help"):
if args == []:
self.print_help()
else:
self.print_help(args[0])
elif(command == "quit"):
self.running = False
elif(command == "load"):
self.currgame = Game(name="My Game")
print("Loaded", self.currgame.name)
print(self.currgame.display_room())
else:
raise NotImplementedError()
else:
raise KeyError("No such command")
def print_help(self, command="shell"):
"""Access the help system and print the requested help to the shell.
Arguments:
command - (default: shell) The command to get help on. If command is
'shell', prints help on all shell commands.
"""
if command == "shell":
print()
print(self.shellname)
print("Shell commands:")
for command in self.command_list:
print(command, ": ", self.command_list[command], sep="")
print()
elif command in self.command_list:
print(command, ": ", self.command_list[command], sep="")
else:
print("No help for that command")
