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https://github.com/avatao-content/baseimage-tutorial-framework
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73 lines
2.7 KiB
Python
73 lines
2.7 KiB
Python
# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
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# All Rights Reserved. See LICENSE file for details.
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from abc import ABC
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from re import match
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from shlex import split
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from tfw.config.logs import logging
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LOG = logging.getLogger(__name__)
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class TerminalCommands(ABC):
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# pylint: disable=anomalous-backslash-in-string
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"""
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A class you can use to define hooks for terminal commands. This means that you can
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have python code executed when the user enters a specific command to the terminal on
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our frontend.
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To receive events you need to subscribe TerminalCommand.callback to a HistoryMonitor
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instance.
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Inherit from this class and define methods which start with "command\_". When the user
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executes the command specified after the underscore, your method will be invoked. All
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such commands must expect the parameter \*args which will contain the arguments of the
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command.
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For example to define a method that runs when someone starts vim in the terminal
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you have to define a method like: "def command_vim(self, \*args)"
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You can also use this class to create new commands similarly.
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"""
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def __init__(self, bashrc=None):
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self._command_method_regex = r'^command_(.+)$'
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self.command_implemetations = self._build_command_to_implementation_dict()
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if bashrc is not None:
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self._setup_bashrc_aliases(bashrc)
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def _build_command_to_implementation_dict(self):
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return {
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self._parse_command_name(fun): getattr(self, fun)
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for fun in dir(self)
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if callable(getattr(self, fun))
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and self._is_command_implementation(fun)
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}
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def _setup_bashrc_aliases(self, bashrc):
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with open(bashrc, 'a') as ofile:
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alias_template = 'type {0} &> /dev/null || alias {0}="{0} &> /dev/null"\n'
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for command in self.command_implemetations.keys():
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ofile.write(alias_template.format(command))
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def _is_command_implementation(self, method_name):
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return bool(self._match_command_regex(method_name))
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def _parse_command_name(self, method_name):
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try:
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return self._match_command_regex(method_name).groups()[0]
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except AttributeError:
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return ''
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def _match_command_regex(self, string):
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return match(self._command_method_regex, string)
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def callback(self, history):
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parts = split(history[-1])
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command = parts[0]
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if command in self.command_implemetations.keys():
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try:
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self.command_implemetations[command](*parts[1:])
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except Exception: # pylint: disable=broad-except
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LOG.exception('Command "%s" failed:', command)
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