~bzr-pqm/bzr/bzr.dev

# Copyright (C) 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: probably should say which arguments are candidates for glob

# expansion on windows and do that at the command level.

# TODO: Define arguments by objects, rather than just using names.

# Those objects can specify the expected type of the argument, which

# would help with validation and shell completion.  They could also provide

# help/explanation for that argument in a structured way.

# TODO: Specific "examples" property on commands for consistent formatting.

# TODO: "--profile=cum", to change sort order.  Is there any value in leaving

# the profile output behind so it can be interactively examined?

import os

import sys

from bzrlib.lazy_import import lazy_import

lazy_import(globals(), """

import codecs

import errno

from warnings import warn

import bzrlib

from bzrlib import (

    debug,

    errors,

    option,

    osutils,

    trace,

    )

""")

from bzrlib.symbol_versioning import (

    deprecated_function,

    deprecated_method,

    zero_eight,

    zero_eleven,

    )

# Compatibility

from bzrlib.option import Option

plugin_cmds = {}

def register_command(cmd, decorate=False):

    """Utility function to help register a command

    :param cmd: Command subclass to register

    :param decorate: If true, allow overriding an existing command

        of the same name; the old command is returned by this function.

        Otherwise it is an error to try to override an existing command.

    """

    global plugin_cmds

    k = cmd.__name__

    if k.startswith("cmd_"):

        k_unsquished = _unsquish_command_name(k)

    else:

        k_unsquished = k

    if k_unsquished not in plugin_cmds:

        plugin_cmds[k_unsquished] = cmd

        ## trace.mutter('registered plugin command %s', k_unsquished)

        if decorate and k_unsquished in builtin_command_names():

            return _builtin_commands()[k_unsquished]

    elif decorate:

        result = plugin_cmds[k_unsquished]

        plugin_cmds[k_unsquished] = cmd

        return result

    else:

        trace.log_error('Two plugins defined the same command: %r' % k)

        trace.log_error('Not loading the one in %r' % sys.modules[cmd.__module__])

def _squish_command_name(cmd):

    return 'cmd_' + cmd.replace('-', '_')

def _unsquish_command_name(cmd):

    assert cmd.startswith("cmd_")

    return cmd[4:].replace('_','-')

def _builtin_commands():

    import bzrlib.builtins

    r = {}

    builtins = bzrlib.builtins.__dict__

    for name in builtins:

        if name.startswith("cmd_"):

            real_name = _unsquish_command_name(name)

            r[real_name] = builtins[name]

    return r

def builtin_command_names():

    """Return list of builtin command names."""

    return _builtin_commands().keys()

def plugin_command_names():

    return plugin_cmds.keys()

def _get_cmd_dict(plugins_override=True):

    """Return name->class mapping for all commands."""

    d = _builtin_commands()

    if plugins_override:

        d.update(plugin_cmds)

    return d

def get_all_cmds(plugins_override=True):

    """Return canonical name and class for all registered commands."""

    for k, v in _get_cmd_dict(plugins_override=plugins_override).iteritems():

        yield k,v

def get_cmd_object(cmd_name, plugins_override=True):

    """Return the canonical name and command class for a command.

    plugins_override

        If true, plugin commands can override builtins.

    """

    try:

        return _get_cmd_object(cmd_name, plugins_override)

    except KeyError:

        raise errors.BzrCommandError('unknown command "%s"' % cmd_name)

def _get_cmd_object(cmd_name, plugins_override=True):

    """Worker for get_cmd_object which raises KeyError rather than BzrCommandError."""

    from bzrlib.externalcommand import ExternalCommand

    # We want only 'ascii' command names, but the user may have typed

    # in a Unicode name. In that case, they should just get a

    # 'command not found' error later.

    # In the future, we may actually support Unicode command names.

    # first look up this command under the specified name

    cmds = _get_cmd_dict(plugins_override=plugins_override)

    try:

        return cmds[cmd_name]()

    except KeyError:

        pass

    # look for any command which claims this as an alias

    for real_cmd_name, cmd_class in cmds.iteritems():

        if cmd_name in cmd_class.aliases:

            return cmd_class()

    cmd_obj = ExternalCommand.find_command(cmd_name)

    if cmd_obj:

        return cmd_obj

    raise KeyError

class Command(object):

    """Base class for commands.

    Commands are the heart of the command-line bzr interface.

    The command object mostly handles the mapping of command-line

    parameters into one or more bzrlib operations, and of the results

    into textual output.

    Commands normally don't have any state.  All their arguments are

    passed in to the run method.  (Subclasses may take a different

    policy if the behaviour of the instance needs to depend on e.g. a

    shell plugin and not just its Python class.)

    The docstring for an actual command should give a single-line

    summary, then a complete description of the command.  A grammar

    description will be inserted.

    aliases

        Other accepted names for this command.

    takes_args

        List of argument forms, marked with whether they are optional,

        repeated, etc.

                Examples:

                ['to_location', 'from_branch?', 'file*']

                'to_location' is required

                'from_branch' is optional

                'file' can be specified 0 or more times

    takes_options

        List of options that may be given for this command.  These can

        be either strings, referring to globally-defined options,

        or option objects.  Retrieve through options().

    hidden

        If true, this command isn't advertised.  This is typically

        for commands intended for expert users.

    encoding_type

        Command objects will get a 'outf' attribute, which has been

        setup to properly handle encoding of unicode strings.

        encoding_type determines what will happen when characters cannot

        be encoded

            strict - abort if we cannot decode

            replace - put in a bogus character (typically '?')

            exact - do not encode sys.stdout

            NOTE: by default on Windows, sys.stdout is opened as a text

            stream, therefore LF line-endings are converted to CRLF.

            When a command uses encoding_type = 'exact', then

            sys.stdout is forced to be a binary stream, and line-endings

            will not mangled.

    """

    aliases = []

    takes_args = []

    takes_options = []

    encoding_type = 'strict'

    hidden = False

    def __init__(self):

        """Construct an instance of this command."""

        if self.__doc__ == Command.__doc__:

            warn("No help message set for %r" % self)

    def _usage(self):

        """Return single-line grammar for this command.

        Only describes arguments, not options.

        """

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

        for aname in self.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 get_help_text(self, additional_see_also=None):

        """Return a text string with help for this command.

        :param additional_see_also: Additional help topics to be

            cross-referenced.

        """

        doc = self.help()

        if doc is None:

            raise NotImplementedError("sorry, no detailed help yet for %r" % self.name())

        result = ""

        result += 'usage: %s\n' % self._usage()

        if self.aliases:

            result += 'aliases:\n'

            result += ', '.join(self.aliases) + '\n'

        result += '\n'

        plugin_name = self.plugin_name()

        if plugin_name is not None:

            result += '(From plugin "%s")' % plugin_name

            result += '\n\n'

        result += doc

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

            result += '\n'

        result += '\n'

        result += option.get_optparser(self.options()).format_option_help()

        see_also = self.get_see_also(additional_see_also)

        if see_also:

            result += '\nSee also: '

            result += ', '.join(see_also)

            result += '\n'

        return result

    def get_help_topic(self):

        """Return the commands help topic - its name."""

        return self.name()

    def get_see_also(self, additional_terms=None):

        """Return a list of help topics that are related to this ommand.

        The list is derived from the content of the _see_also attribute. Any

        duplicates are removed and the result is in lexical order.

        :param additional_terms: Additional help topics to cross-reference.

        :return: A list of help topics.

        """

        see_also = set(getattr(self, '_see_also', []))

        if additional_terms:

            see_also.update(additional_terms)

        return sorted(see_also)

    def options(self):

        """Return dict of valid options for this command.

        Maps from long option name to option object."""

        r = dict()

        r['help'] = option.Option.OPTIONS['help']

        for o in self.takes_options:

            if isinstance(o, basestring):

                o = option.Option.OPTIONS[o]

            r[o.name] = o

        return r

    def _setup_outf(self):

        """Return a file linked to stdout, which has proper encoding."""

        assert self.encoding_type in ['strict', 'exact', 'replace']

        # Originally I was using self.stdout, but that looks

        # *way* too much like sys.stdout

        if self.encoding_type == 'exact':

            # force sys.stdout to be binary stream on win32

            if sys.platform == 'win32':

                fileno = getattr(sys.stdout, 'fileno', None)

                if fileno:

                    import msvcrt

                    msvcrt.setmode(fileno(), os.O_BINARY)

            self.outf = sys.stdout

            return

        output_encoding = osutils.get_terminal_encoding()

        # use 'replace' so that we don't abort if trying to write out

        # in e.g. the default C locale.

        self.outf = codecs.getwriter(output_encoding)(sys.stdout, errors=self.encoding_type)

        # For whatever reason codecs.getwriter() does not advertise its encoding

        # it just returns the encoding of the wrapped file, which is completely

        # bogus. So set the attribute, so we can find the correct encoding later.

        self.outf.encoding = output_encoding

    def run_argv_aliases(self, argv, alias_argv=None):

        """Parse the command line and run with extra aliases in alias_argv."""

        if argv is None:

            warn("Passing None for [] is deprecated from bzrlib 0.10",

                 DeprecationWarning, stacklevel=2)

            argv = []

        args, opts = parse_args(self, argv, alias_argv)

        if 'help' in opts:  # e.g. bzr add --help

            sys.stdout.write(self.get_help_text())

            return 0

        # mix arguments and options into one dictionary

        cmdargs = _match_argform(self.name(), self.takes_args, args)

        cmdopts = {}

        for k, v in opts.items():

            cmdopts[k.replace('-', '_')] = v

        all_cmd_args = cmdargs.copy()

        all_cmd_args.update(cmdopts)

        self._setup_outf()

        return self.run(**all_cmd_args)

    def run(self):

        """Actually run the command.

        This is invoked with the options and arguments bound to

        keyword parameters.

        Return 0 or None if the command was successful, or a non-zero

        shell error code if not.  It's OK for this method to allow

        an exception to raise up.

        """

        raise NotImplementedError('no implementation of command %r'

                                  % self.name())

    def help(self):

        """Return help message for this class."""

        from inspect import getdoc

        if self.__doc__ is Command.__doc__:

            return None

        return getdoc(self)

    def name(self):

        return _unsquish_command_name(self.__class__.__name__)

    def plugin_name(self):

        """Get the name of the plugin that provides this command.

        :return: The name of the plugin or None if the command is builtin.

        """

        mod_parts = self.__module__.split('.')

        if len(mod_parts) >= 3 and mod_parts[1] == 'plugins':

            return mod_parts[2]

        else:

            return None

# Technically, this function hasn't been use in a *really* long time

# but we are only deprecating it now.

@deprecated_function(zero_eleven)

def parse_spec(spec):

    """

    >>> parse_spec(None)

    [None, None]

    >>> parse_spec("./")

    ['./', None]

    >>> parse_spec("../@")

    ['..', -1]

    >>> parse_spec("../f/@35")

    ['../f', 35]

    >>> parse_spec('./@revid:john@arbash-meinel.com-20050711044610-3ca0327c6a222f67')

    ['.', 'revid:john@arbash-meinel.com-20050711044610-3ca0327c6a222f67']

    """

    if spec is None:

        return [None, None]

    if '/@' in spec:

        parsed = spec.split('/@')

        assert len(parsed) == 2

        if parsed[1] == "":

            parsed[1] = -1

        else:

            try:

                parsed[1] = int(parsed[1])

            except ValueError:

                pass # We can allow stuff like ./@revid:blahblahblah

            else:

                assert parsed[1] >=0

    else:

        parsed = [spec, None]

    return parsed

def parse_args(command, argv, alias_argv=None):

    """Parse command line.

    Arguments and options are parsed at this level before being passed

    down to specific command handlers.  This routine knows, from a

    lookup table, something about the available options, what optargs

    they take, and which commands will accept them.

    """

    # TODO: make it a method of the Command?

    parser = option.get_optparser(command.options())

    if alias_argv is not None:

        args = alias_argv + argv

    else:

        args = argv

    options, args = parser.parse_args(args)

    opts = dict([(k, v) for k, v in options.__dict__.iteritems() if

                 v is not option.OptionParser.DEFAULT_VALUE])

    return args, opts

def _match_argform(cmd, takes_args, args):

    argdict = {}

    # step through args and takes_args, allowing appropriate 0-many matches

    for ap in takes_args:

        argname = ap[:-1]

        if ap[-1] == '?':

            if args:

                argdict[argname] = args.pop(0)

        elif ap[-1] == '*': # all remaining arguments

            if args:

                argdict[argname + '_list'] = args[:]

                args = []

            else:

                argdict[argname + '_list'] = None

        elif ap[-1] == '+':

            if not args:

                raise errors.BzrCommandError("command %r needs one or more %s"

                                             % (cmd, argname.upper()))

            else:

                argdict[argname + '_list'] = args[:]

                args = []

        elif ap[-1] == '$': # all but one

            if len(args) < 2:

                raise errors.BzrCommandError("command %r needs one or more %s"

                                             % (cmd, argname.upper()))

            argdict[argname + '_list'] = args[:-1]

            args[:-1] = []

        else:

            # just a plain arg

            argname = ap

            if not args:

                raise errors.BzrCommandError("command %r requires argument %s"

                               % (cmd, argname.upper()))

            else:

                argdict[argname] = args.pop(0)

    if args:

        raise errors.BzrCommandError("extra argument to command %s: %s"

                                     % (cmd, args[0]))

    return argdict

def apply_profiled(the_callable, *args, **kwargs):

    import hotshot

    import tempfile

    import hotshot.stats

    pffileno, pfname = tempfile.mkstemp()

    try:

        prof = hotshot.Profile(pfname)

        try:

            ret = prof.runcall(the_callable, *args, **kwargs) or 0

        finally:

            prof.close()

        stats = hotshot.stats.load(pfname)

        stats.strip_dirs()

        stats.sort_stats('cum')   # 'time'

        ## XXX: Might like to write to stderr or the trace file instead but

        ## print_stats seems hardcoded to stdout

        stats.print_stats(20)

        return ret

    finally:

        os.close(pffileno)

        os.remove(pfname)

def apply_lsprofiled(filename, the_callable, *args, **kwargs):

    from bzrlib.lsprof import profile

    import cPickle

    ret, stats = profile(the_callable, *args, **kwargs)

    stats.sort()

    if filename is None:

        stats.pprint()

    else:

        stats.freeze()

        cPickle.dump(stats, open(filename, 'w'), 2)

        print 'Profile data written to %r.' % filename

    return ret

def get_alias(cmd, config=None):

    """Return an expanded alias, or None if no alias exists.

    cmd

        Command to be checked for an alias.

    config

        Used to specify an alternative config to use,

        which is especially useful for testing.

        If it is unspecified, the global config will be used.

    """

    if config is None:

        import bzrlib.config

        config = bzrlib.config.GlobalConfig()

    alias = config.get_alias(cmd)

    if (alias):

        import shlex

        return [a.decode('utf-8') for a in shlex.split(alias.encode('utf-8'))]

    return None

def run_bzr(argv):

    """Execute a command.

    This is similar to main(), but without all the trappings for

    logging and error handling.  

    argv

       The command-line arguments, without the program name from argv[0]

       These should already be decoded. All library/test code calling

       run_bzr should be passing valid strings (don't need decoding).

    Returns a command status or raises an exception.

    Special master options: these must come before the command because

    they control how the command is interpreted.

    --no-plugins

        Do not load plugin modules at all

    --no-aliases

        Do not allow aliases

    --builtin

        Only use builtin commands.  (Plugins are still allowed to change

        other behaviour.)

    --profile

        Run under the Python hotshot profiler.

    --lsprof

        Run under the Python lsprof profiler.

    """

    argv = list(argv)

    trace.mutter("bzr arguments: %r", argv)

    opt_lsprof = opt_profile = opt_no_plugins = opt_builtin =  \

                opt_no_aliases = False

    opt_lsprof_file = None

    # --no-plugins is handled specially at a very early stage. We need

    # to load plugins before doing other command parsing so that they

    # can override commands, but this needs to happen first.

    argv_copy = []

    i = 0

    while i < len(argv):

        a = argv[i]

        if a == '--profile':

            opt_profile = True

        elif a == '--lsprof':

            opt_lsprof = True

        elif a == '--lsprof-file':

            opt_lsprof = True

            opt_lsprof_file = argv[i + 1]

            i += 1

        elif a == '--no-plugins':

            opt_no_plugins = True

        elif a == '--no-aliases':

            opt_no_aliases = True

        elif a == '--builtin':

            opt_builtin = True

        elif a in ('--quiet', '-q'):

            trace.be_quiet()

        elif a.startswith('-D'):

            debug.debug_flags.add(a[2:])

        else:

            argv_copy.append(a)

        i += 1

    argv = argv_copy

    if (not argv):

        from bzrlib.builtins import cmd_help

        cmd_help().run_argv_aliases([])

        return 0

    if argv[0] == '--version':

        from bzrlib.version import show_version

        show_version()

        return 0

    if not opt_no_plugins:

        from bzrlib.plugin import load_plugins

        load_plugins()

    else:

        from bzrlib.plugin import disable_plugins

        disable_plugins()

    alias_argv = None

    if not opt_no_aliases:

        alias_argv = get_alias(argv[0])

        if alias_argv:

            alias_argv = [a.decode(bzrlib.user_encoding) for a in alias_argv]

            argv[0] = alias_argv.pop(0)

    cmd = argv.pop(0)

    # We want only 'ascii' command names, but the user may have typed

    # in a Unicode name. In that case, they should just get a

    # 'command not found' error later.

    cmd_obj = get_cmd_object(cmd, plugins_override=not opt_builtin)

    run = cmd_obj.run_argv_aliases

    run_argv = [argv, alias_argv]

    try:

        if opt_lsprof:

            ret = apply_lsprofiled(opt_lsprof_file, run, *run_argv)

        elif opt_profile:

            ret = apply_profiled(run, *run_argv)

        else:

            ret = run(*run_argv)

        return ret or 0

    finally:

        # reset, in case we may do other commands later within the same process

        trace.be_quiet(False)

def display_command(func):

    """Decorator that suppresses pipe/interrupt errors."""

    def ignore_pipe(*args, **kwargs):

        try:

            result = func(*args, **kwargs)

            sys.stdout.flush()

            return result

        except IOError, e:

            if getattr(e, 'errno', None) is None:

                raise

            if e.errno != errno.EPIPE:

                # Win32 raises IOError with errno=0 on a broken pipe