"Fossies" - the Fresh Open Source Software Archive

Member "polysh-polysh-0.13/polysh/control_commands_helpers.py" (11 May 2020, 4496 Bytes) of package /linux/privat/polysh-polysh-0.13.tar.gz:

    1 """Polysh - Helpers for Control Commands
    2 
    3 Copyright (c) 2006 Guillaume Chazarain <guichaz@gmail.com>
    4 Copyright (c) 2018 InnoGames GmbH
    5 """
    6 # This program is free software: you can redistribute it and/or modify
    7 # it under the terms of the GNU General Public License as published by
    8 # the Free Software Foundation, either version 2 of the License, or
    9 # (at your option) any later version.
   10 #
   11 # This program is distributed in the hope that it will be useful,
   12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   14 # GNU General Public License for more details.
   15 #
   16 # You should have received a copy of the GNU General Public License
   17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
   18 
   19 import os
   20 from fnmatch import fnmatch
   21 import readline
   22 from typing import Iterator, List, Set, Callable
   23 
   24 from polysh.host_syntax import expand_syntax
   25 from polysh.console import console_output
   26 from polysh import dispatchers
   27 from polysh import remote_dispatcher
   28 
   29 
   30 def toggle_shells(command: str, enable: bool) -> None:
   31     """Enable or disable the specified shells. If the command would have
   32     no effect, it changes all other shells to the inverse enable value."""
   33     selection = list(selected_shells(command))
   34     if command and command != '*' and selection:
   35         for i in selection:
   36             if i.state != remote_dispatcher.STATE_DEAD and i.enabled != enable:
   37                 break
   38         else:
   39             toggle_shells('*', not enable)
   40 
   41     for i in selection:
   42         if i.state != remote_dispatcher.STATE_DEAD:
   43             i.set_enabled(enable)
   44 
   45 
   46 def selected_shells(
   47     command: str
   48 ) -> Iterator[remote_dispatcher.RemoteDispatcher]:
   49     """Iterator over the shells with names matching the patterns.
   50     An empty patterns matches all the shells"""
   51     if not command or command == '*':
   52         for i in dispatchers.all_instances():
   53             yield i
   54         return
   55     selected = set()  # type: Set[remote_dispatcher.RemoteDispatcher]
   56     instance_found = False
   57     for pattern in command.split():
   58         found = False
   59         for expanded_pattern in expand_syntax(pattern):
   60             for i in dispatchers.all_instances():
   61                 instance_found = True
   62                 if (
   63                     fnmatch(i.display_name, expanded_pattern) or
   64                     fnmatch(str(i.last_printed_line), expanded_pattern)
   65                 ):
   66                     found = True
   67                     if i not in selected:
   68                         selected.add(i)
   69                         yield i
   70         if instance_found and not found:
   71             console_output('{} not found\n'.format(pattern).encode())
   72 
   73 
   74 def complete_shells(
   75         line: str, text: str,
   76         predicate: Callable = lambda i: True) -> List[str]:
   77     """Return the shell names to include in the completion"""
   78     res = [i.display_name + ' ' for i in dispatchers.all_instances() if
   79            i.display_name.startswith(text) and
   80            predicate(i) and
   81            ' ' + i.display_name + ' ' not in line]
   82     return res
   83 
   84 
   85 def expand_local_path(path: str) -> str:
   86     return os.path.expanduser(os.path.expandvars(path) or '~')
   87 
   88 
   89 def list_control_commands() -> List[str]:
   90     from polysh import control_commands
   91     return [c[3:] for c in dir(control_commands) if c.startswith('do_')]
   92 
   93 
   94 def get_control_command(name: str) -> Callable:
   95     from polysh import control_commands
   96     func = getattr(control_commands, 'do_' + name)
   97     return func
   98 
   99 
  100 def complete_control_command(line: str, text: str) -> List[str]:
  101     from polysh import control_commands
  102     if readline.get_begidx() == 0:
  103         # Completing control command name
  104         cmds = list_control_commands()
  105         prefix = text[1:]
  106         matches = [':' + cmd + ' ' for cmd in cmds if cmd.startswith(prefix)]
  107     else:
  108         # Completing control command parameters
  109         cmd = line.split()[0][1:]
  110 
  111         def def_compl(line: str) -> List:
  112             return []
  113         compl_func = getattr(control_commands, 'complete_' + cmd, def_compl)
  114         matches = compl_func(line, text)
  115     return matches
  116 
  117 
  118 def handle_control_command(line: str) -> None:
  119     if not line:
  120         return
  121     cmd_name = line.split()[0]
  122     try:
  123         cmd_func = get_control_command(cmd_name)
  124     except AttributeError:
  125         console_output(
  126             'Unknown control command: {}\n'.format(cmd_name).encode())
  127     else:
  128         parameters = line[len(cmd_name) + 1:]
  129         cmd_func(parameters)