107 lines
3.4 KiB
Python
107 lines
3.4 KiB
Python
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# gameshell.py
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#
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# Copyright 2018 chees <chees@DESKTOP-0CA7MCF>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301, USA.
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#
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# Ver. 0.1.0017
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import types as _types
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import traceback as _tb
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class Shell(object):
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def __init__(self):
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self.__commands = {'exit': self.exitShell}
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self.__aliases = {}
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self.ps1 = '> '
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self.ps2 = '> '
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self.__exit = False
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def run(self):
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"""The main game/shell loop"""
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while not self.__exit:
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print(self.ps1, end = '')
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command = self.scanInput()
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# we have to handle shell built-ins first (when we get some)
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if len(command) == 0:
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continue
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if command[0] in self.__commands:
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try:
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self.__commands[command[0]](command[1:])
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except Exception as e:
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_tb.print_exc()
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print(e)
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else:
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self.handleUnknownCommand(command)
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self.update()
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def man(self, args):
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help(self.__commands[args[0]])
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def registerCommand(self, commandName: str, command: _types.FunctionType):
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"""command must be a function that takes one argument: a list of strings,
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conventionally called args or argv"""
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self.__commands[commandName] = command
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def registerAlias(self, a: str, original: list):
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"""makes 'a' an alias for original.
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'a' must be one token, but original can be multiple."""
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self.__aliases[a] = original
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def getAlias(self, a: str):
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if a in self.__aliases:
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return self.__aliases[a]
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else:
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return None
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def exitShell(self, args):
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"""The default exit command."""
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self.__exit = True
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# Beyond this point are functions that are called within the main loop.
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def scanInput(self):
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"""Parses input. Override this for custom input parsing, or input source."""
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ret = input()
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if ret == '':
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return []
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ret = ret.split()
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a = self.getAlias(ret[0])
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if a:
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ret = a[:] + ret[1:]
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return ret
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def handleUnknownCommand(self, command):
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"""Handle commands that aren't registered. Override this if you want to do
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something with those commands."""
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print("Bad command.")
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def update(self):
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"""Runs at the end of each loop. Does nothing by default. Override this if
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there is something you want the shell to do between every command."""
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pass
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def main(args):
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return 0
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if __name__ == '__main__':
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import sys
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sys.exit(main(sys.argv))
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