code.grnet.gr Git - kamaki/blob - kamaki/cli/command_shell.py

   1 # Copyright 2012 GRNET S.A. All rights reserved.
   2 #
   3 # Redistribution and use in source and binary forms, with or
   4 # without modification, are permitted provided that the following
   5 # conditions are met:
   6 #
   7 #   1. Redistributions of source code must retain the above
   8 #         copyright notice, this list of conditions and the following
   9 #         disclaimer.
  10 #
  11 #   2. Redistributions in binary form must reproduce the above
  12 #         copyright notice, this list of conditions and the following
  13 #         disclaimer in the documentation and/or other materials
  14 #         provided with the distribution.
  15 #
  16 # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  17 # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  18 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
  20 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  23 # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  24 # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  26 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27 # POSSIBILITY OF SUCH DAMAGE.
  28 #
  29 # The views and conclusions contained in the software and
  30 # documentation are those of the authors and should not be
  31 # interpreted as representing official policies, either expressed
  32 # or implied, of GRNET S.A.
  33
  34 from cmd import Cmd
  35 from new import instancemethod
  36 from os import popen
  37 from argparse import ArgumentParser
  38 from . import _update_parser
  39 from .errors import CLIError
  40 from .argument import _arguments
  41 from .utils import magenta
  42
  43 def _fix_arguments():
  44         _arguments.pop('version', None)
  45         _arguments.pop('options', None)
  46
  47 class Shell(Cmd):
  48         """Kamaki interactive shell"""
  49         _prefix = '['
  50         _suffix = ']:'
  51
  52         def greet(self, version):
  53                 print('kamaki v%s - Interactive Shell\n\t(exit or ^D to exit)\n'%version)
  54         def set_prompt(self, new_prompt):
  55                 self.prompt = '[%s]:'%new_prompt
  56
  57         def do_exit(self, line):
  58                 print
  59                 return True
  60
  61         def do_shell(self, line):
  62                 output = popen(line).read()
  63                 print output
  64         def help_shell(self):
  65                 print('Execute OS shell commands')
  66
  67         @classmethod
  68         def _register_method(self, method, name):
  69                 #self.__dict__[name] = method
  70                 self._tmp_method = instancemethod(method, name, self)
  71                 setattr(self, name, self._tmp_method)
  72                 del self._tmp_method
  73
  74         def _register_command(self, cmd):
  75                 method_name = 'do_%s'%cmd.name
  76                 def do_method(self, line):
  77                         subcmd, cmd_argv = cmd.parse_out(line.split())
  78
  79                         subname = subcmd.name if cmd == subcmd else subcmd.path
  80                         cmd_parser = ArgumentParser(subname, add_help=False)
  81                         if subcmd.is_command:
  82                                 cls = subcmd.get_class()
  83                                 instance = cls(_arguments)
  84                                 _update_parser(cmd_parser, instance.arguments)
  85                                 cmd_parser.prog += ' '+cls.syntax
  86                         if '-h' in cmd_argv or '--help'in cmd_argv:
  87                                 cmd_parser.description = subcmd.help
  88                                 cmd_parser.print_help()
  89                                 return
  90
  91                         if subcmd.is_command:
  92                                 parsed, unparsed = cmd_parser.parse_known_args(cmd_argv)
  93
  94                                 for name, arg in instance.arguments.items():
  95                                         arg.value = getattr(parsed, name, arg.default)
  96                                 try:
  97                                         instance.main(*unparsed)
  98                                 except TypeError as e:
  99                                         if e.args and e.args[0].startswith('main()'):
 100                                                 print(magenta('Syntax error'))
 101                                                 if instance.get_argument('verbose'):
 102                                                         print(unicode(e))
 103                                                 print(subcmd.description)
 104                                                 cmd_parser.print_help()
 105                                         else:
 106                                                 raise
 107                                 except CLIError as err:
 108                                         _print_error_message(err)
 109                         else:
 110                                 newshell = Shell()
 111                                 newshell.set_prompt(' '.join(cmd.path.split('_')))
 112                                 newshell.do_EOF = newshell.do_exit
 113                                 newshell.kamaki_loop(cmd, cmd.path)
 114                 self._register_method(do_method, method_name)
 115
 116                 method_name = 'help_%s'%cmd.name
 117                 def help_method(self):
 118                         if cmd.has_description:
 119                                 print(cmd.description)
 120                         else:
 121                                 print('(no description)')
 122                 self._register_method(help_method, method_name)
 123
 124                 method_name = 'complete_%s'%cmd.name
 125                 def complete_method(self, text, line, begidx, endidx):
 126                         print('Complete 0% FAT')
 127                         return cmd.get_subnames()
 128                 self._register_method(complete_method, method_name)
 129                 print('Registed %s as %s'%(complete_method, method_name))
 130
 131         def kamaki_loop(self,command,prefix=''):
 132                 #setup prompt
 133                 if prefix in (None, ''):
 134                         self.set_prompt(command.name)
 135                 else:
 136                         self.set_prompt(' '.join(command.path.split()))
 137
 138                 for cmd in command.get_subcommands():
 139                         self._register_command(cmd)
 140
 141                 self.cmdloop()