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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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"""Bazaar-NG -- a free distributed version-control tool
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http://bazaar-vcs.org/
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bzr init makes this directory a versioned branch
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bzr branch make a copy of another branch
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bzr add make files or directories versioned
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bzr ignore ignore a file or pattern
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bzr mv move or rename a versioned file
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bzr status summarize changes in working copy
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bzr diff show detailed diffs
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bzr merge pull in changes from another branch
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bzr commit save some or all changes
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bzr log show history of changes
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bzr check validate storage
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bzr help init more help on e.g. init command
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bzr help commands list all commands
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def help(topic=None, outfile = None):
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outfile.write(global_help)
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elif topic == 'commands':
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help_commands(outfile = outfile)
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help_on_command(topic, outfile = outfile)
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def command_usage(cmd_object):
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"""Return single-line grammar for command.
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Only describes arguments, not options.
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s = 'bzr ' + cmd_object.name() + ' '
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for aname in cmd_object.takes_args:
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if aname[-1] in ['$', '+']:
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aname = aname[:-1] + '...'
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elif aname[-1] == '?':
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aname = '[' + aname[:-1] + ']'
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elif aname[-1] == '*':
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aname = '[' + aname[:-1] + '...]'
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def help_on_command(cmdname, outfile=None):
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from bzrlib.commands import get_cmd_object
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cmdname = str(cmdname)
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cmd_object = get_cmd_object(cmdname)
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doc = cmd_object.help()
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raise NotImplementedError("sorry, no detailed help yet for %r" % cmdname)
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print >>outfile, 'usage:', command_usage(cmd_object)
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if cmd_object.aliases:
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print >>outfile, 'aliases:',
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print >>outfile, ', '.join(cmd_object.aliases)
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help_on_command_options(cmd_object, outfile)
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def help_on_command_options(cmd, outfile=None):
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from bzrlib.option import Option
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options = cmd.options()
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outfile.write('\noptions:\n')
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for option_name, option in sorted(options.items()):
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l = ' --' + option_name
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if option.type is not None:
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l += ' ' + option.argname.upper()
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short_name = option.short_name()
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assert len(short_name) == 1
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l += ', -' + short_name
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l += (30 - len(l)) * ' ' + option.help
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# TODO: split help over multiple lines with correct indenting and
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wrapped = textwrap.fill(l, initial_indent='', subsequent_indent=30*' ')
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outfile.write(wrapped + '\n')
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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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from bzrlib.commands import (builtin_command_names,
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plugin_command_names,
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outfile = sys.stdout
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names = set() # to eliminate duplicates
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names.update(builtin_command_names())
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names.update(plugin_command_names())
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for cmd_name in names:
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cmd_object = get_cmd_object(cmd_name)
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if cmd_object.hidden:
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print >>outfile, command_usage(cmd_object)
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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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print >>outfile, ' ' + firstline
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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
