polysh/control_commands_helpers.py

   1 # This program is free software; you can redistribute it and/or modify
   2 # it under the terms of the GNU General Public License as published by
   3 # the Free Software Foundation; either version 2 of the License, or
   4 # (at your option) any later version.
   5 #
   6 # This program is distributed in the hope that it will be useful,
   7 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 # GNU Library General Public License for more details.
  10 #
  11 # You should have received a copy of the GNU General Public License
  12 # along with this program; if not, write to the Free Software
  13 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  14 #
  15 # See the COPYING file for license information.
  16 #
  17 # Copyright (c) 2006 Guillaume Chazarain <guichaz@gmail.com>
  18
  19 import os
  20 from fnmatch import fnmatch
  21 import readline
  22
  23 from polysh.host_syntax import expand_syntax
  24 from polysh.console import console_output
  25 from polysh import dispatchers
  26 from polysh import remote_dispatcher
  27
  28 def toggle_shells(command, enable):
  29     """Enable or disable the specified shells. If the command would have
  30     no effect, it changes all other shells to the inverse enable value."""
  31     selection = list(selected_shells(command))
  32     if command and command != '*' and selection:
  33         for i in selection:
  34             if i.state != remote_dispatcher.STATE_DEAD and i.enabled != enable:
  35                 break
  36         else:
  37             toggle_shells('*', not enable)
  38
  39     for i in selection:
  40         if i.state != remote_dispatcher.STATE_DEAD:
  41             i.set_enabled(enable)
  42
  43 def selected_shells(command):
  44     """Iterator over the shells with names matching the patterns.
  45     An empty patterns matches all the shells"""
  46     if not command or command == '*':
  47         for i in dispatchers.all_instances():
  48             yield i
  49         return
  50     selected = set()
  51     instance_found = False
  52     for pattern in command.split():
  53         found = False
  54         for expanded_pattern in expand_syntax(pattern):
  55             for i in dispatchers.all_instances():
  56                 instance_found = True
  57                 if fnmatch(i.display_name, expanded_pattern):
  58                     found = True
  59                     if i not in selected:
  60                         selected.add(i)
  61                         yield i
  62         if instance_found and not found:
  63             console_output('%s not found\n' % pattern)
  64
  65 def complete_shells(line, text, predicate=lambda i: True):
  66     """Return the shell names to include in the completion"""
  67     res = [i.display_name + ' ' for i in dispatchers.all_instances() if \
  68                 i.display_name.startswith(text) and \
  69                 predicate(i) and \
  70                 ' ' + i.display_name + ' ' not in line]
  71     return res
  72
  73 def expand_local_path(path):
  74     return os.path.expanduser(os.path.expandvars(path) or '~')
  75
  76 def list_control_commands():
  77     from polysh import control_commands
  78     return [c[3:] for c in dir(control_commands) if c.startswith('do_')]
  79
  80 def get_control_command(name):
  81     from polysh import control_commands
  82     func = getattr(control_commands, 'do_' + name)
  83     return func
  84
  85 def complete_control_command(line, text):
  86     from polysh import control_commands
  87     if readline.get_begidx() == 0:
  88         # Completing control command name
  89         cmds = list_control_commands()
  90         prefix = text[1:]
  91         matches = [':' + cmd + ' ' for cmd in cmds if cmd.startswith(prefix)]
  92     else:
  93         # Completing control command parameters
  94         cmd = line.split()[0][1:]
  95         def_compl = lambda line: []
  96         compl_func = getattr(control_commands, 'complete_' + cmd, def_compl)
  97         matches = compl_func(line, text)
  98     return matches
  99
 100 def handle_control_command(line):
 101     if not line:
 102         return
 103     cmd_name = line.split()[0]
 104     try:
 105         cmd_func = get_control_command(cmd_name)
 106     except AttributeError:
 107         console_output('Unknown control command: %s\n' % cmd_name)
 108     else:
 109         parameters = line[len(cmd_name) + 1:]
 110         cmd_func(parameters)
 111