~bzr-pqm/bzr/bzr.dev : contents of bzrlib/commands.py at revision 1163

~bzr-pqm/bzr/bzr.dev : (revision 1163)
# Copyright (C) 2004, 2005 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: probably should say which arguments are candidates for glob
# expansion on windows and do that at the command level.

# TODO: Help messages for options.

# 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.



import sys
import os
from warnings import warn
from inspect import getdoc

import bzrlib
import bzrlib.trace
from bzrlib.trace import mutter, note, log_error, warning
from bzrlib.errors import BzrError, BzrCheckError, BzrCommandError
from bzrlib.branch import find_branch
from bzrlib import BZRDIR

plugin_cmds = {}


def register_command(cmd):
    "Utility function to help register a command"
    global plugin_cmds
    k = cmd.__name__
    if k.startswith("cmd_"):
        k_unsquished = _unsquish_command_name(k)
    else:
        k_unsquished = k
    if not plugin_cmds.has_key(k_unsquished):
        plugin_cmds[k_unsquished] = cmd
        mutter('registered plugin command %s', k_unsquished)      
    else:
        log_error('Two plugins defined the same command: %r' % k)
        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 _parse_revision_str(revstr):
    """This handles a revision string -> revno.

    This always returns a list.  The list will have one element for 

    It supports integers directly, but everything else it
    defers for passing to Branch.get_revision_info()

    >>> _parse_revision_str('234')
    [234]
    >>> _parse_revision_str('234..567')
    [234, 567]
    >>> _parse_revision_str('..')
    [None, None]
    >>> _parse_revision_str('..234')
    [None, 234]
    >>> _parse_revision_str('234..')
    [234, None]
    >>> _parse_revision_str('234..456..789') # Maybe this should be an error
    [234, 456, 789]
    >>> _parse_revision_str('234....789') # Error?
    [234, None, 789]
    >>> _parse_revision_str('revid:test@other.com-234234')
    ['revid:test@other.com-234234']
    >>> _parse_revision_str('revid:test@other.com-234234..revid:test@other.com-234235')
    ['revid:test@other.com-234234', 'revid:test@other.com-234235']
    >>> _parse_revision_str('revid:test@other.com-234234..23')
    ['revid:test@other.com-234234', 23]
    >>> _parse_revision_str('date:2005-04-12')
    ['date:2005-04-12']
    >>> _parse_revision_str('date:2005-04-12 12:24:33')
    ['date:2005-04-12 12:24:33']
    >>> _parse_revision_str('date:2005-04-12T12:24:33')
    ['date:2005-04-12T12:24:33']
    >>> _parse_revision_str('date:2005-04-12,12:24:33')
    ['date:2005-04-12,12:24:33']
    >>> _parse_revision_str('-5..23')
    [-5, 23]
    >>> _parse_revision_str('-5')
    [-5]
    >>> _parse_revision_str('123a')
    ['123a']
    >>> _parse_revision_str('abc')
    ['abc']
    """
    import re
    old_format_re = re.compile('\d*:\d*')
    m = old_format_re.match(revstr)
    if m:
        warning('Colon separator for revision numbers is deprecated.'
                ' Use .. instead')
        revs = []
        for rev in revstr.split(':'):
            if rev:
                revs.append(int(rev))
            else:
                revs.append(None)
        return revs
    revs = []
    for x in revstr.split('..'):
        if not x:
            revs.append(None)
        else:
            try:
                revs.append(int(x))
            except ValueError:
                revs.append(x)
    return revs


def get_merge_type(typestring):
    """Attempt to find the merge class/factory associated with a string."""
    from merge import merge_types
    try:
        return merge_types[typestring][0]
    except KeyError:
        templ = '%s%%7s: %%s' % (' '*12)
        lines = [templ % (f[0], f[1][1]) for f in merge_types.iteritems()]
        type_list = '\n'.join(lines)
        msg = "No known merge type %s. Supported types are:\n%s" %\
            (typestring, type_list)
        raise BzrCommandError(msg)
    

def get_merge_type(typestring):
    """Attempt to find the merge class/factory associated with a string."""
    from merge import merge_types
    try:
        return merge_types[typestring][0]
    except KeyError:
        templ = '%s%%7s: %%s' % (' '*12)
        lines = [templ % (f[0], f[1][1]) for f in merge_types.iteritems()]
        type_list = '\n'.join(lines)
        msg = "No known merge type %s. Supported types are:\n%s" %\
            (typestring, type_list)
        raise BzrCommandError(msg)


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.
    """
    from bzrlib.externalcommand import ExternalCommand

    cmd_name = str(cmd_name)            # not unicode

    # 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 BzrCommandError("unknown command %r" % cmd_name)


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.

    takes_options
        List of options that may be given for this command.

    hidden
        If true, this command isn't advertised.  This is typically
        for commands intended for expert users.
    """
    aliases = []
    
    takes_args = []
    takes_options = []

    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 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()


    def help(self):
        """Return help message for this class."""
        if self.__doc__ is Command.__doc__:
            return None
        return getdoc(self)

    def name(self):
        return _unsquish_command_name(self.__class__.__name__)


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




# list of all available options; the rhs can be either None for an
# option that takes no argument, or a constructor function that checks
# the type.
OPTIONS = {
    'all':                    None,
    'diff-options':           str,
    'help':                   None,
    'file':                   unicode,
    'force':                  None,
    'format':                 unicode,
    'forward':                None,
    'message':                unicode,
    'no-recurse':             None,
    'profile':                None,
    'revision':               _parse_revision_str,
    'short':                  None,
    'show-ids':               None,
    'timezone':               str,
    'verbose':                None,
    'version':                None,
    'email':                  None,
    'unchanged':              None,
    'update':                 None,
    'long':                   None,
    'root':                   str,
    'no-backup':              None,
    'merge-type':             get_merge_type,
    'pattern':                str,
    }

SHORT_OPTIONS = {
    'F':                      'file', 
    'h':                      'help',
    'm':                      'message',
    'r':                      'revision',
    'v':                      'verbose',
    'l':                      'long',
}


def parse_args(argv):
    """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.

    >>> parse_args('--help'.split())
    ([], {'help': True})
    >>> parse_args('help -- --invalidcmd'.split())
    (['help', '--invalidcmd'], {})
    >>> parse_args('--version'.split())
    ([], {'version': True})
    >>> parse_args('status --all'.split())
    (['status'], {'all': True})
    >>> parse_args('commit --message=biter'.split())
    (['commit'], {'message': u'biter'})
    >>> parse_args('log -r 500'.split())
    (['log'], {'revision': [500]})
    >>> parse_args('log -r500..600'.split())
    (['log'], {'revision': [500, 600]})
    >>> parse_args('log -vr500..600'.split())
    (['log'], {'verbose': True, 'revision': [500, 600]})
    >>> parse_args('log -rv500..600'.split()) #the r takes an argument
    (['log'], {'revision': ['v500', 600]})
    """
    args = []
    opts = {}

    argsover = False
    while argv:
        a = argv.pop(0)
        if not argsover and a[0] == '-':
            # option names must not be unicode
            a = str(a)
            optarg = None
            if a[1] == '-':
                if a == '--':
                    # We've received a standalone -- No more flags
                    argsover = True
                    continue
                mutter("  got option %r" % a)
                if '=' in a:
                    optname, optarg = a[2:].split('=', 1)
                else:
                    optname = a[2:]
                if optname not in OPTIONS:
                    raise BzrError('unknown long option %r' % a)
            else:
                shortopt = a[1:]
                if shortopt in SHORT_OPTIONS:
                    # Multi-character options must have a space to delimit
                    # their value
                    optname = SHORT_OPTIONS[shortopt]
                else:
                    # Single character short options, can be chained,
                    # and have their value appended to their name
                    shortopt = a[1:2]
                    if shortopt not in SHORT_OPTIONS:
                        # We didn't find the multi-character name, and we
                        # didn't find the single char name
                        raise BzrError('unknown short option %r' % a)
                    optname = SHORT_OPTIONS[shortopt]

                    if a[2:]:
                        # There are extra things on this option
                        # see if it is the value, or if it is another
                        # short option
                        optargfn = OPTIONS[optname]
                        if optargfn is None:
                            # This option does not take an argument, so the
                            # next entry is another short option, pack it back
                            # into the list
                            argv.insert(0, '-' + a[2:])
                        else:
                            # This option takes an argument, so pack it
                            # into the array
                            optarg = a[2:]
            
            if optname in opts:
                # XXX: Do we ever want to support this, e.g. for -r?
                raise BzrError('repeated option %r' % a)
                
            optargfn = OPTIONS[optname]
            if optargfn:
                if optarg == None:
                    if not argv:
                        raise BzrError('option %r needs an argument' % a)
                    else:
                        optarg = argv.pop(0)
                opts[optname] = optargfn(optarg)
            else:
                if optarg != None:
                    raise BzrError('option %r takes no argument' % optname)
                opts[optname] = True
        else:
            args.append(a)

    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 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 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 BzrCommandError("command %r requires argument %s"
                        % (cmd, argname.upper()))
            else:
                argdict[argname] = args.pop(0)
            
    if args:
        raise BzrCommandError("extra argument to command %s: %s"
                              % (cmd, args[0]))

    return argdict



def apply_profiled(the_callable, *args, **kwargs):
    import hotshot
    import tempfile
    pffileno, pfname = tempfile.mkstemp()
    try:
        prof = hotshot.Profile(pfname)
        try:
            ret = prof.runcall(the_callable, *args, **kwargs) or 0
        finally:
            prof.close()

        import hotshot.stats
        stats = hotshot.stats.load(pfname)
        #stats.strip_dirs()
        stats.sort_stats('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 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]
    
    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

    --builtin
        Only use builtin commands.  (Plugins are still allowed to change
        other behaviour.)

    --profile
        Run under the Python profiler.
    """
    
    argv = [a.decode(bzrlib.user_encoding) for a in argv]

    opt_profile = opt_no_plugins = opt_builtin = False

    # --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.

    for a in argv[:]:
        if a == '--profile':
            opt_profile = True
        elif a == '--no-plugins':
            opt_no_plugins = True
        elif a == '--builtin':
            opt_builtin = True
        else:
            break
        argv.remove(a)

    if not opt_no_plugins:
        from bzrlib.plugin import load_plugins
        load_plugins()

    args, opts = parse_args(argv)

    if 'help' in opts:
        from bzrlib.help import help
        if args:
            help(args[0])
        else:
            help()
        return 0            
        
    if 'version' in opts:
        from bzrlib.builtins import show_version
        show_version()
        return 0
    
    if not args:
        from bzrlib.help import help
        help(None)
        return 0
    
    cmd = str(args.pop(0))

    cmd_obj = get_cmd_object(cmd, plugins_override=not opt_builtin)

    # check options are reasonable
    allowed = cmd_obj.takes_options
    for oname in opts:
        if oname not in allowed:
            raise BzrCommandError("option '--%s' is not allowed for command %r"
                                  % (oname, cmd))

    # mix arguments and options into one dictionary
    cmdargs = _match_argform(cmd, cmd_obj.takes_args, args)
    cmdopts = {}
    for k, v in opts.items():
        cmdopts[k.replace('-', '_')] = v

    all_cmd_args = cmdargs.copy()
    all_cmd_args.update(cmdopts)

    if opt_profile:
        ret = apply_profiled(cmd_obj.run, **all_cmd_args)
    else:
        ret = cmd_obj.run(**all_cmd_args)

    if ret is None:
        ret = 0
    return ret


def main(argv):
    import bzrlib.ui
    bzrlib.trace.log_startup(argv)
    bzrlib.ui.ui_factory = bzrlib.ui.TextUIFactory()

    try:
        try:
            return run_bzr(argv[1:])
        finally:
            # do this here inside the exception wrappers to catch EPIPE
            sys.stdout.flush()
    except BzrCommandError, e:
        # command line syntax error, etc
        log_error(str(e))
        return 1
    except BzrError, e:
        bzrlib.trace.log_exception()
        return 1
    except AssertionError, e:
        bzrlib.trace.log_exception('assertion failed: ' + str(e))
        return 3
    except KeyboardInterrupt, e:
        bzrlib.trace.note('interrupted')
        return 2
    except Exception, e:
        import errno
        if (isinstance(e, IOError) 
            and hasattr(e, 'errno')
            and e.errno == errno.EPIPE):
            bzrlib.trace.note('broken pipe')
            return 2
        else:
            bzrlib.trace.log_exception()
            return 2


if __name__ == '__main__':
    sys.exit(main(sys.argv))