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# Copyright (C) 2004, 2005, 2006 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# TODO: Some way to get a list of external commands (defined by shell
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# scripts) so that they can be included in the help listing as well.
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# It should be enough to just list the plugin directory and look for
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# executable files with reasonable names.
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# TODO: `help commands --all` should show hidden commands
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commands as _mod_commands,
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def help(topic=None, outfile=None):
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"""Write the help for the specific topic to outfile"""
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indices = HelpIndices()
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alias = _mod_commands.get_alias(topic)
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topics = indices.search(topic)
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for index, topic in topics[1:]:
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shadowed_terms.append('%s%s' % (index.prefix,
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topic.get_help_topic()))
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outfile.write(topics[0][1].get_help_text(shadowed_terms))
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except errors.NoHelpTopic:
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outfile.write("'bzr %s' is an alias for 'bzr %s'.\n" % (topic,
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def help_commands(outfile=None):
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"""List all commands"""
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outfile.write(_help_commands_to_text('commands'))
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def _help_commands_to_text(topic):
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"""Generate the help text for the list of commands"""
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if topic == 'hidden-commands':
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names = set(_mod_commands.builtin_command_names()) # to eliminate duplicates
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names.update(_mod_commands.plugin_command_names())
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commands = ((n, _mod_commands.get_cmd_object(n)) for n in names)
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shown_commands = [(n, o) for n, o in commands if o.hidden == hidden]
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max_name = max(len(n) for n, o in shown_commands)
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indent = ' ' * (max_name + 1)
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width = osutils.terminal_width() - 1
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for cmd_name, cmd_object in sorted(shown_commands):
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plugin_name = cmd_object.plugin_name()
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if plugin_name is None:
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plugin_name = ' [%s]' % plugin_name
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cmd_help = cmd_object.help()
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firstline = cmd_help.split('\n', 1)[0]
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helpstring = '%-*s %s%s' % (max_name, cmd_name, firstline, plugin_name)
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lines = textwrap.wrap(helpstring, subsequent_indent=indent,
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out.append(line + '\n')
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help_topics.topic_registry.register("commands",
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_help_commands_to_text,
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"Basic help for all commands",
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help_topics.SECT_HIDDEN)
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help_topics.topic_registry.register("hidden-commands",
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_help_commands_to_text,
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"All hidden commands",
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help_topics.SECT_HIDDEN)
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class HelpIndices(object):
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"""Maintainer of help topics across multiple indices.
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It is currently separate to the HelpTopicRegistry because of its ordered
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nature, but possibly we should instead structure it as a search within the
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registry and add ordering and searching facilities to the registry. The
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registry would probably need to be restructured to support that cleanly
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which is why this has been implemented in parallel even though it does as a
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result permit searching for help in indices which are not discoverable via
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Each index has a unique prefix string, such as "commands", and contains
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help topics which can be listed or searched.
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help_topics.HelpTopicIndex(),
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_mod_commands.HelpCommandIndex(),
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plugin.PluginsHelpIndex(),
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def _check_prefix_uniqueness(self):
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"""Ensure that the index collection is able to differentiate safely."""
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for index in self.search_path:
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prefixes.setdefault(index.prefix, []).append(index)
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for prefix, indices in prefixes.items():
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raise errors.DuplicateHelpPrefix(prefix)
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def search(self, topic):
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"""Search for topic across the help search path.
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:param topic: A string naming the help topic to search for.
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:raises: NoHelpTopic if none of the indexs in search_path have topic.
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:return: A list of HelpTopics which matched 'topic'.
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self._check_prefix_uniqueness()
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for index in self.search_path:
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result.extend([(index, _topic) for _topic in index.get_topics(topic)])
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raise errors.NoHelpTopic(topic)
added
removed
bzrlib/help.py
