~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2004, 2005, 2006 by 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 textwrap

global_help = \

"""Bazaar -- a free distributed version-control tool

http://bazaar-vcs.org/

Basic commands:

  bzr init           makes this directory a versioned branch

  bzr branch         make a copy of another branch

  bzr add            make files or directories versioned

  bzr ignore         ignore a file or pattern

  bzr mv             move or rename a versioned file

  bzr status         summarize changes in working copy

  bzr diff           show detailed diffs

  bzr merge          pull in changes from another branch

  bzr commit         save some or all changes

  bzr log            show history of changes

  bzr check          validate storage

  bzr help init      more help on e.g. init command

  bzr help commands  list all commands

"""

import sys

def help(topic=None, outfile = None):

    if outfile == None:

        outfile = sys.stdout

    if topic == None:

        outfile.write(global_help)

    elif topic == 'commands':

        help_commands(outfile = outfile)

    else:

        help_on_command(topic, outfile = outfile)

def command_usage(cmd_object):

    """Return single-line grammar for command.

    Only describes arguments, not options.

    """

    s = 'bzr ' + cmd_object.name() + ' '

    for aname in cmd_object.takes_args:

        aname = aname.upper()

        if aname[-1] in ['$', '+']:

            aname = aname[:-1] + '...'

        elif aname[-1] == '?':

            aname = '[' + aname[:-1] + ']'

        elif aname[-1] == '*':

            aname = '[' + aname[:-1] + '...]'

        s += aname + ' '

    assert s[-1] == ' '

    s = s[:-1]

    return s

def print_command_plugin(cmd_object, outfile, format):

    """Print the plugin that provides a command object, if any.

    If the cmd_object is provided by a plugin, prints the plugin name to

    outfile using the provided format string.

    """

    plugin_name = cmd_object.plugin_name()

    if plugin_name is not None:

        out_str = '(From plugin "%s")' % plugin_name

        outfile.write(format % out_str)

def help_on_command(cmdname, outfile=None):

    from bzrlib.commands import get_cmd_object

    cmdname = str(cmdname)

    if outfile == None:

        outfile = sys.stdout

    cmd_object = get_cmd_object(cmdname)

    doc = cmd_object.help()

    if doc == None:

        raise NotImplementedError("sorry, no detailed help yet for %r" % cmdname)

    print >>outfile, 'usage:', command_usage(cmd_object) 

    if cmd_object.aliases:

        print >>outfile, 'aliases:',

        print >>outfile, ', '.join(cmd_object.aliases)

    print >>outfile

    print_command_plugin(cmd_object, outfile, '%s\n\n')

    outfile.write(doc)

    if doc[-1] != '\n':

        outfile.write('\n')

    help_on_command_options(cmd_object, outfile)

def help_on_command_options(cmd, outfile=None):

    from bzrlib.option import Option

    options = cmd.options()

    if not options:

        return

    if outfile == None:

        outfile = sys.stdout

    outfile.write('\noptions:\n')

    for option_name, option in sorted(options.items()):

        l = '    --' + option_name

        if option.type is not None:

            l += ' ' + option.argname.upper()

        short_name = option.short_name()

        if short_name:

            assert len(short_name) == 1

            l += ', -' + short_name

        l += (30 - len(l)) * ' ' + option.help

        # TODO: split help over multiple lines with correct indenting and 

        # wrapping

        wrapped = textwrap.fill(l, initial_indent='', subsequent_indent=30*' ')

        outfile.write(wrapped + '\n')

def help_commands(outfile=None):

    """List all commands"""

    from bzrlib.commands import (builtin_command_names,

                                 plugin_command_names,

                                 get_cmd_object)

    if outfile == None:

        outfile = sys.stdout

    names = set()                       # to eliminate duplicates

    names.update(builtin_command_names())

    names.update(plugin_command_names())

    names = list(names)

    names.sort()

    for cmd_name in names:

        cmd_object = get_cmd_object(cmd_name)

        if cmd_object.hidden:

            continue

        print >>outfile, command_usage(cmd_object)

        plugin_name = cmd_object.plugin_name()

        print_command_plugin(cmd_object, outfile, '        %s\n')

        cmd_help = cmd_object.help()

        if cmd_help:

            firstline = cmd_help.split('\n', 1)[0]

            print >>outfile, '        ' + firstline