root / kamaki / cli / command_shell.py @ cad39033
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# Copyright 2012 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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from cmd import Cmd |
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from os import popen |
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from sys import stdout |
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from argparse import ArgumentParser |
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from kamaki.cli import _exec_cmd, _print_error_message |
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from kamaki.cli.argument import _arguments, update_arguments |
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from kamaki.cli.utils import print_dict |
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from kamaki.cli.history import History |
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from kamaki.cli.errors import CLIError |
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def _init_shell(exe_string, arguments): |
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arguments.pop('version', None) |
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arguments.pop('options', None) |
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arguments.pop('history', None) |
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shell = Shell() |
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shell.set_prompt(exe_string) |
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from kamaki import __version__ as version |
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shell.greet(version) |
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shell.do_EOF = shell.do_exit |
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from kamaki.cli.command_tree import CommandTree |
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shell.cmd_tree = CommandTree( |
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'kamaki', 'A command line tool for poking clouds') |
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return shell
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class Shell(Cmd): |
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"""Kamaki interactive shell"""
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_prefix = '['
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_suffix = ']:'
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cmd_tree = None
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_history = None
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_arguments = None
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_context_stack = [] |
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_prompt_stack = [] |
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undoc_header = 'interactive shell commands:'
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def postcmd(self, post, line): |
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if self._context_stack: |
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self._roll_command()
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self._restore(self._context_stack.pop()) |
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self.set_prompt(self._prompt_stack.pop()[1:-2]) |
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return Cmd.postcmd(self, post, line) |
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def precmd(self, line): |
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if line.startswith('/'): |
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cur_cmd_path = self.prompt.replace(' ', '_')[1:-2] |
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if cur_cmd_path != self.cmd_tree.name: |
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cur_cmd = self.cmd_tree.get_command(cur_cmd_path)
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self._context_stack.append(self._backup()) |
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self._prompt_stack.append(self.prompt) |
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new_context = self
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self._roll_command(cur_cmd.path)
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new_context.set_prompt(self.cmd_tree.name)
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for grp_cmd in self.cmd_tree.get_subcommands(): |
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self._register_command(grp_cmd.path)
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return line[1:] |
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return line
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def greet(self, version): |
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print('kamaki v%s - Interactive Shell\n\t(exit or ^D to exit)\n'\
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% version) |
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def set_prompt(self, new_prompt): |
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self.prompt = '[%s]:' % new_prompt |
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def do_exit(self, line): |
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print('')
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if self.prompt[1:-2] == self.cmd_tree.name: |
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exit(0) |
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return True |
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def do_shell(self, line): |
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output = popen(line).read() |
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print(output) |
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@property
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def path(self): |
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if self._cmd: |
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return self._cmd.path |
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return '' |
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@classmethod
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def _register_method(self, method, name): |
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self.__dict__[name] = method
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@classmethod
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def _unregister_method(self, name): |
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try:
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self.__dict__.pop(name)
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except KeyError: |
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pass
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def _roll_command(self, cmd_path=None): |
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for subname in self.cmd_tree.get_subnames(cmd_path): |
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self._unregister_method('do_%s' % subname) |
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self._unregister_method('complete_%s' % subname) |
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self._unregister_method('help_%s' % subname) |
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@classmethod
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def _backup(self): |
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return dict(self.__dict__) |
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@classmethod
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def _restore(self, oldcontext): |
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self.__dict__ = oldcontext
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def _register_command(self, cmd_path): |
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cmd = self.cmd_tree.get_command(cmd_path)
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arguments = self._arguments
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def do_method(new_context, line): |
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""" Template for all cmd.Cmd methods of the form do_<cmd name>
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Parse cmd + args and decide to execute or change context
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<cmd> <term> <term> <args> is always parsed to most specific
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even if cmd_term_term is not a terminal path
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"""
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subcmd, cmd_args = cmd.parse_out(line.split()) |
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if self._history: |
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self._history.add(' '.join([cmd.path.replace('_', ' '), line])) |
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cmd_parser = ArgumentParser(cmd.name, add_help=False)
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cmd_parser.description = subcmd.help |
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# exec command or change context
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if subcmd.is_command: # exec command |
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cls = subcmd.get_class() |
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instance = cls(dict(arguments))
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cmd_parser.prog = '%s %s' % (cmd_parser.prog.replace('_', ' '), |
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cls.syntax) |
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update_arguments(cmd_parser, instance.arguments) |
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if '-h' in cmd_args or '--help' in cmd_args: |
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cmd_parser.print_help() |
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return
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parsed, unparsed = cmd_parser.parse_known_args(cmd_args) |
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for name, arg in instance.arguments.items(): |
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arg.value = getattr(parsed, name, arg.default)
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try:
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_exec_cmd(instance, unparsed, cmd_parser.print_help) |
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except CLIError as err: |
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_print_error_message(err) |
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elif ('-h' in cmd_args or '--help' in cmd_args) \ |
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or len(cmd_args): # print options |
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print('%s: %s' % (cmd.name, subcmd.help))
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options = {} |
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for sub in subcmd.get_subcommands(): |
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options[sub.name] = sub.help |
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print_dict(options) |
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else: # change context |
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#new_context = this
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backup_context = self._backup()
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old_prompt = self.prompt
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new_context._roll_command(cmd.parent_path) |
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new_context.set_prompt(subcmd.path.replace('_', ' ')) |
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newcmds = [subcmd for subcmd in subcmd.get_subcommands()] |
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for subcmd in newcmds: |
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new_context._register_command(subcmd.path) |
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new_context.cmdloop() |
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self.prompt = old_prompt
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#when new context is over, roll back to the old one
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self._restore(backup_context)
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self._register_method(do_method, 'do_%s' % cmd.name) |
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def help_method(self): |
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print('%s (%s -h for more options)' % (cmd.help, cmd.name))
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self._register_method(help_method, 'help_%s' % cmd.name) |
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def complete_method(self, text, line, begidx, endidx): |
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subcmd, cmd_args = cmd.parse_out(line.split()[1:])
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if subcmd.is_command:
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cls = subcmd.get_class() |
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instance = cls(dict(arguments))
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empty, sep, subname = subcmd.path.partition(cmd.path) |
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cmd_name = '%s %s' % (cmd.name, subname.replace('_', ' ')) |
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print('\n%s\nSyntax:\t%s %s'\
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% (cls.description, cmd_name, cls.syntax)) |
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cmd_args = {} |
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for arg in instance.arguments.values(): |
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cmd_args[','.join(arg.parsed_name)] = arg.help
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print_dict(cmd_args, ident=2)
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stdout.write('%s %s' % (self.prompt, line)) |
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return subcmd.get_subnames()
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self._register_method(complete_method, 'complete_%s' % cmd.name) |
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@property
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def doc_header(self): |
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tmp_partition = self.prompt.partition(self._prefix) |
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tmp_partition = tmp_partition[2].partition(self._suffix) |
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hdr = tmp_partition[0].strip()
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return '%s commands:' % hdr |
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def run(self, arguments, path=''): |
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self._history = History(arguments['config'].get('history', 'file')) |
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self._arguments = arguments
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if path:
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cmd = self.cmd_tree.get_command(path)
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intro = cmd.path.replace('_', ' ') |
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else:
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intro = self.cmd_tree.name
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for subcmd in self.cmd_tree.get_subcommands(path): |
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self._register_command(subcmd.path)
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self.set_prompt(intro)
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self.cmdloop()
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