Synnefo » ./kamaki

# Copyright 2012 GRNET S.A. All rights reserved.

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from cmd import Cmd

from new import instancemethod

from os import popen

from argparse import ArgumentParser

from kamaki.cli import _update_parser, _exec_cmd

from .errors import CLIError

from .argument import _arguments

from .utils import magenta, print_dict

from sys import stdout

from .history import History

def _fix_arguments():

        _arguments.pop('version', None)

        _arguments.pop('options', None)

        _arguments.pop('history', None)

class Shell(Cmd):

        """Kamaki interactive shell"""

        _prefix = '['

        _suffix = ']:'

        cmd_tree = None

        _history = None

        undoc_header='interactive shell commands:'

        def greet(self, version):

                print('kamaki v%s - Interactive Shell\n\t(exit or ^D to exit)\n'%version)

        def set_prompt(self, new_prompt):

                self.prompt = '[%s]:'%new_prompt

        def do_exit(self, line):

                print('')

                return True

        def do_shell(self, line):

                output = popen(line).read()

                print(output)

        @property 

        def path(self):

                if self._cmd:

                        return _cmd.path

                return ''

        @classmethod

        def _register_method(self, method, name):

                self.__dict__[name]=method

        @classmethod

        def _unregister_method(self, name):

                try:

                        self.__dict__.pop(name)

                except KeyError:

                        pass

        def _roll_command(self, cmd_path):

                for subname in self.cmd_tree.get_subnames(cmd_path):

                        self._unregister_method('do_%s'%subname)

                        self._unregister_method('complete_%s'%subname)

                        self._unregister_method('help_%s'%subname)

        @classmethod 

        def _backup(self):

                return dict(self.__dict__)

        @classmethod

        def _restore(self, oldcontext):

                self.__dict__= oldcontext

        def _push_in_command(self, cmd_path):

                cmd = self.cmd_tree.get_command(cmd_path)

                _cmd_tree = self.cmd_tree

                _history = self._history

                def do_method(self, line):

                        """ Template for all cmd.Cmd methods of the form do_<cmd name>

                                Parse cmd + args and decide to execute or change context

                                <cmd> <term> <term> <args> is always parsed to the most specific cmd path

                                even if cmd_term_term is not a terminal path

                        """

                        if _history:

                                _history.add(' '.join([cmd.path.replace('_',' '), line]))

                        subcmd, cmd_args = cmd.parse_out(line.split())

                        active_terms = [cmd.name]+subcmd.path.split('_')[len(cmd.path.split('_')):]

                        subname = '_'.join(active_terms)

                        cmd_parser = ArgumentParser(subname, add_help=False)

                        cmd_parser.description = subcmd.help

                        #exec command or change context

                        if subcmd.is_command:#exec command

                                cls = subcmd.get_class()

                                instance = cls(dict(_arguments))

                                cmd_parser.prog= cmd_parser.prog.replace('_', ' ')+' '+cls.syntax

                                _update_parser(cmd_parser, instance.arguments)

                                if '-h' in cmd_args or '--help' in cmd_args:

                                        cmd_parser.print_help()

                                        return

                                parsed, unparsed = cmd_parser.parse_known_args(cmd_args)

                                for name, arg in instance.arguments.items():

                                        arg.value = getattr(parsed, name, arg.default)

                                _exec_cmd(instance, unparsed, cmd_parser.print_help)

                        elif ('-h' in cmd_args or '--help' in cmd_args) \

                        or len(cmd_args):#print options

                                print('%s: %s'%(subname, subcmd.help))

                                options = {}

                                for sub in subcmd.get_subcommands():

                                        options[sub.name] = sub.help

                                print_dict(options)

                        else:#change context

                                new_context = self

                                backup_context = self._backup()

                                old_prompt = self.prompt

                                new_context._roll_command(cmd.parent_path)

                                new_context.set_prompt(subcmd.path.replace('_',' '))

                                newcmds = [subcmd for subcmd in subcmd.get_subcommands()]

                                for subcmd in newcmds:

                                        new_context._push_in_command(subcmd.path)

                                new_context.cmdloop()

                                self.prompt = old_prompt

                                #when new context is over, roll back to the old one

                                self._restore(backup_context)

                self._register_method(do_method, 'do_%s'%cmd.name)

                def help_method(self):

                        print('%s (%s -h for more options)'%(cmd.help, cmd.name))

                self._register_method(help_method, 'help_%s'%cmd.name)

                def complete_method(self, text, line, begidx, endidx):

                        subcmd, cmd_args = cmd.parse_out(line.split()[1:])

                        if subcmd.is_command:

                                cls = subcmd.get_class()

                                instance = cls(dict(_arguments))

                                empty, sep, subname = subcmd.path.partition(cmd.path)

                                cmd_name = '%s %s'%(cmd.name,subname.replace('_',' '))

                                print('\n%s\nSyntax:\t%s %s'%(cls.description,cmd_name,cls.syntax))

                                cmd_args={}

                                for arg in instance.arguments.values():

                                        cmd_args[','.join(arg.parsed_name)]=arg.help

                                print_dict(cmd_args, ident=14)

                                stdout.write('%s %s'%(self.prompt,line))

                        return subcmd.get_subnames()

                self._register_method(complete_method, 'complete_%s'%cmd.name)

        @property 

        def doc_header(self):

                hdr = self.prompt.partition(self._prefix)[2].partition(self._suffix)[0].strip()

                return '%s commands:'%hdr

        def run(self, path=''):

                self._history = History(_arguments['config'].get('history', 'file'))

                if len(path):

                        cmd = self.cmd_tree.get_command(path)

                        intro = cmd.path.replace('_', ' ')

                else:

                        intro = self.cmd_tree.name

                for subcmd in self.cmd_tree.get_subcommands(path):

                        self._push_in_command(subcmd.path)

                self.set_prompt(intro)

                self.cmdloop()