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