1
# Copyright (C) 2004, 2005, 2006 Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17
# TODO: Some way to get a list of external commands (defined by shell
18
# scripts) so that they can be included in the help listing as well.
19
# It should be enough to just list the plugin directory and look for
20
# executable files with reasonable names.
22
# TODO: `help commands --all` should show hidden commands
28
commands as _mod_commands,
37
def help(topic=None, outfile=None):
38
"""Write the help for the specific topic to outfile"""
42
indices = HelpIndices()
44
alias = _mod_commands.get_alias(topic)
46
topics = indices.search(topic)
48
for index, topic in topics[1:]:
49
shadowed_terms.append('%s%s' % (index.prefix,
50
topic.get_help_topic()))
52
outfile.write(source.get_help_text(shadowed_terms))
53
except errors.NoHelpTopic:
58
outfile.write("'bzr %s' is an alias for 'bzr %s'.\n" % (topic,
62
def help_commands(outfile=None):
63
"""List all commands"""
66
outfile.write(_help_commands_to_text('commands'))
69
def _help_commands_to_text(topic):
70
"""Generate the help text for the list of commands"""
72
if topic == 'hidden-commands':
76
names = set(_mod_commands.builtin_command_names()) # to eliminate duplicates
77
names.update(_mod_commands.plugin_command_names())
78
commands = ((n, _mod_commands.get_cmd_object(n)) for n in names)
79
shown_commands = [(n, o) for n, o in commands if o.hidden == hidden]
80
max_name = max(len(n) for n, o in shown_commands)
81
indent = ' ' * (max_name + 1)
82
width = osutils.terminal_width() - 1
84
for cmd_name, cmd_object in sorted(shown_commands):
85
plugin_name = cmd_object.plugin_name()
86
if plugin_name is None:
89
plugin_name = ' [%s]' % plugin_name
91
cmd_help = cmd_object.help()
93
firstline = cmd_help.split('\n', 1)[0]
96
helpstring = '%-*s %s%s' % (max_name, cmd_name, firstline, plugin_name)
97
lines = textwrap.wrap(helpstring, subsequent_indent=indent,
100
out.append(line + '\n')
104
help_topics.topic_registry.register("commands",
105
_help_commands_to_text,
106
"Basic help for all commands",
107
help_topics.SECT_HIDDEN)
108
help_topics.topic_registry.register("hidden-commands",
109
_help_commands_to_text,
110
"All hidden commands",
111
help_topics.SECT_HIDDEN)
114
class HelpIndices(object):
115
"""Maintainer of help topics across multiple indices.
117
It is currently separate to the HelpTopicRegistry because of its ordered
118
nature, but possibly we should instead structure it as a search within the
119
registry and add ordering and searching facilities to the registry. The
120
registry would probably need to be restructured to support that cleanly
121
which is why this has been implemented in parallel even though it does as a
122
result permit searching for help in indices which are not discoverable via
125
Each index has a unique prefix string, such as "commands", and contains
126
help topics which can be listed or searched.
131
help_topics.HelpTopicIndex(),
132
_mod_commands.HelpCommandIndex(),
133
plugin.PluginsHelpIndex(),
136
def _check_prefix_uniqueness(self):
137
"""Ensure that the index collection is able to differentiate safely."""
139
for index in self.search_path:
140
prefixes.setdefault(index.prefix, []).append(index)
141
for prefix, indices in prefixes.items():
143
raise errors.DuplicateHelpPrefix(prefix)
145
def search(self, topic):
146
"""Search for topic across the help search path.
148
:param topic: A string naming the help topic to search for.
149
:raises: NoHelpTopic if none of the indexs in search_path have topic.
150
:return: A list of HelpTopics which matched 'topic'.
152
self._check_prefix_uniqueness()
154
for index in self.search_path:
155
result.extend([(index, _topic) for _topic in index.get_topics(topic)])
157
raise errors.NoHelpTopic(topic)