/brz/remove-bazaar : contents of bzrlib/commands.py at revision 591

: (revision 591)

To get this branch, use:

bzr branch
http://gegoxaren.bato24.eu/bzr/brz/remove-bazaar

# 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



import sys, os

import bzrlib
from bzrlib.trace import mutter, note, log_error
from bzrlib.errors import bailout, BzrError, BzrCheckError, BzrCommandError
from bzrlib.osutils import quotefn, pumpfile, isdir, isfile
from bzrlib.tree import RevisionTree, EmptyTree, Tree
from bzrlib.revision import Revision
from bzrlib import Branch, Inventory, InventoryEntry, ScratchBranch, BZRDIR, \
     format_date


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. 

    There are several possibilities:

        '234'       -> 234
        '234:345'   -> [234, 345]
        ':234'      -> [None, 234]
        '234:'      -> [234, None]

    In the future we will also support:
        'uuid:blah-blah-blah'   -> ?
        'hash:blahblahblah'     -> ?
        potentially:
        'tag:mytag'             -> ?
    """
    if revstr.find(':') != -1:
        revs = revstr.split(':')
        if len(revs) > 2:
            raise ValueError('More than 2 pieces not supported for --revision: %r' % revstr)

        if not revs[0]:
            revs[0] = None
        else:
            revs[0] = int(revs[0])

        if not revs[1]:
            revs[1] = None
        else:
            revs[1] = int(revs[1])
    else:
        revs = int(revstr)
    return revs

def get_all_cmds():
    """Return canonical name and class for all registered commands."""
    for k, v in globals().iteritems():
        if k.startswith("cmd_"):
            yield _unsquish_command_name(k), v

def get_cmd_class(cmd):
    """Return the canonical name and command class for a command.
    """
    cmd = str(cmd)                      # not unicode

    # first look up this command under the specified name
    try:
        return cmd, globals()[_squish_command_name(cmd)]
    except KeyError:
        pass

    # look for any command which claims this as an alias
    for cmdname, cmdclass in get_all_cmds():
        if cmd in cmdclass.aliases:
            return cmdname, cmdclass

    cmdclass = ExternalCommand.find_command(cmd)
    if cmdclass:
        return cmd, cmdclass

    raise BzrCommandError("unknown command %r" % cmd)


class Command(object):
    """Base class for commands.

    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.

    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.
    """
    aliases = []
    
    takes_args = []
    takes_options = []

    hidden = False
    
    def __init__(self, options, arguments):
        """Construct and run the command.

        Sets self.status to the return value of run()."""
        assert isinstance(options, dict)
        assert isinstance(arguments, dict)
        cmdargs = options.copy()
        cmdargs.update(arguments)
        assert self.__doc__ != Command.__doc__, \
               ("No help message set for %r" % self)
        self.status = self.run(**cmdargs)

    
    def run(self):
        """Override this in sub-classes.

        This is invoked with the options and arguments bound to
        keyword parameters.

        Return 0 or None if the command was successful, or a shell
        error code if not.
        """
        return 0


class ExternalCommand(Command):
    """Class to wrap external commands.

    We cheat a little here, when get_cmd_class() calls us we actually give it back
    an object we construct that has the appropriate path, help, options etc for the
    specified command.

    When run_bzr() tries to instantiate that 'class' it gets caught by the __call__
    method, which we override to call the Command.__init__ method. That then calls
    our run method which is pretty straight forward.

    The only wrinkle is that we have to map bzr's dictionary of options and arguments
    back into command line options and arguments for the script.
    """

    def find_command(cls, cmd):
        import os.path
        bzrpath = os.environ.get('BZRPATH', '')

        for dir in bzrpath.split(':'):
            path = os.path.join(dir, cmd)
            if os.path.isfile(path):
                return ExternalCommand(path)

        return None

    find_command = classmethod(find_command)

    def __init__(self, path):
        self.path = path

        # TODO: If either of these fail, we should detect that and
        # assume that path is not really a bzr plugin after all.

        pipe = os.popen('%s --bzr-usage' % path, 'r')
        self.takes_options = pipe.readline().split()
        self.takes_args = pipe.readline().split()
        pipe.close()

        pipe = os.popen('%s --bzr-help' % path, 'r')
        self.__doc__ = pipe.read()
        pipe.close()

    def __call__(self, options, arguments):
        Command.__init__(self, options, arguments)
        return self

    def run(self, **kargs):
        opts = []
        args = []

        keys = kargs.keys()
        keys.sort()
        for name in keys:
            value = kargs[name]
            if OPTIONS.has_key(name):
                # it's an option
                opts.append('--%s' % name)
                if value is not None and value is not True:
                    opts.append(str(value))
            else:
                # it's an arg, or arg list
                if type(value) is not list:
                    value = [value]
                for v in value:
                    if v is not None:
                        args.append(str(v))

        self.status = os.spawnv(os.P_WAIT, self.path, [self.path] + opts + args)
        return self.status


class cmd_status(Command):
    """Display status summary.

    This reports on versioned and unknown files, reporting them
    grouped by state.  Possible states are:

    added
        Versioned in the working copy but not in the previous revision.

    removed
        Versioned in the previous revision but removed or deleted
        in the working copy.

    renamed
        Path of this file changed from the previous revision;
        the text may also have changed.  This includes files whose
        parent directory was renamed.

    modified
        Text has changed since the previous revision.

    unchanged
        Nothing about this file has changed since the previous revision.
        Only shown with --all.

    unknown
        Not versioned and not matching an ignore pattern.

    To see ignored files use 'bzr ignored'.  For details in the
    changes to file texts, use 'bzr diff'.

    If no arguments are specified, the status of the entire working
    directory is shown.  Otherwise, only the status of the specified
    files or directories is reported.  If a directory is given, status
    is reported for everything inside that directory.
    """
    takes_args = ['file*']
    takes_options = ['all', 'show-ids']
    aliases = ['st', 'stat']
    
    def run(self, all=False, show_ids=False, file_list=None):
        if file_list:
            b = Branch(file_list[0])
            file_list = [b.relpath(x) for x in file_list]
            # special case: only one path was given and it's the root
            # of the branch
            if file_list == ['']:
                file_list = None
        else:
            b = Branch('.')
        import status
        status.show_status(b, show_unchanged=all, show_ids=show_ids,
                           specific_files=file_list)


class cmd_cat_revision(Command):
    """Write out metadata for a revision."""

    hidden = True
    takes_args = ['revision_id']
    
    def run(self, revision_id):
        Branch('.').get_revision(revision_id).write_xml(sys.stdout)


class cmd_revno(Command):
    """Show current revision number.

    This is equal to the number of revisions on this branch."""
    def run(self):
        print Branch('.').revno()

    
class cmd_add(Command):
    """Add specified files or directories.

    In non-recursive mode, all the named items are added, regardless
    of whether they were previously ignored.  A warning is given if
    any of the named files are already versioned.

    In recursive mode (the default), files are treated the same way
    but the behaviour for directories is different.  Directories that
    are already versioned do not give a warning.  All directories,
    whether already versioned or not, are searched for files or
    subdirectories that are neither versioned or ignored, and these
    are added.  This search proceeds recursively into versioned
    directories.

    Therefore simply saying 'bzr add .' will version all files that
    are currently unknown.

    TODO: Perhaps adding a file whose directly is not versioned should
    recursively add that parent, rather than giving an error?
    """
    takes_args = ['file+']
    takes_options = ['verbose']
    
    def run(self, file_list, verbose=False):
        bzrlib.add.smart_add(file_list, verbose)


class cmd_relpath(Command):
    """Show path of a file relative to root"""
    takes_args = ['filename']
    hidden = True
    
    def run(self, filename):
        print Branch(filename).relpath(filename)



class cmd_inventory(Command):
    """Show inventory of the current working copy or a revision."""
    takes_options = ['revision', 'show-ids']
    
    def run(self, revision=None, show_ids=False):
        b = Branch('.')
        if revision == None:
            inv = b.read_working_inventory()
        else:
            inv = b.get_revision_inventory(b.lookup_revision(revision))

        for path, entry in inv.entries():
            if show_ids:
                print '%-50s %s' % (path, entry.file_id)
            else:
                print path


class cmd_move(Command):
    """Move files to a different directory.

    examples:
        bzr move *.txt doc

    The destination must be a versioned directory in the same branch.
    """
    takes_args = ['source$', 'dest']
    def run(self, source_list, dest):
        b = Branch('.')

        b.move([b.relpath(s) for s in source_list], b.relpath(dest))


class cmd_rename(Command):
    """Change the name of an entry.

    examples:
      bzr rename frob.c frobber.c
      bzr rename src/frob.c lib/frob.c

    It is an error if the destination name exists.

    See also the 'move' command, which moves files into a different
    directory without changing their name.

    TODO: Some way to rename multiple files without invoking bzr for each
    one?"""
    takes_args = ['from_name', 'to_name']
    
    def run(self, from_name, to_name):
        b = Branch('.')
        b.rename_one(b.relpath(from_name), b.relpath(to_name))



class cmd_renames(Command):
    """Show list of renamed files.

    TODO: Option to show renames between two historical versions.

    TODO: Only show renames under dir, rather than in the whole branch.
    """
    takes_args = ['dir?']

    def run(self, dir='.'):
        b = Branch(dir)
        old_inv = b.basis_tree().inventory
        new_inv = b.read_working_inventory()

        renames = list(bzrlib.tree.find_renames(old_inv, new_inv))
        renames.sort()
        for old_name, new_name in renames:
            print "%s => %s" % (old_name, new_name)        


class cmd_info(Command):
    """Show statistical information about a branch."""
    takes_args = ['branch?']
    
    def run(self, branch=None):
        import info

        from branch import find_branch
        b = find_branch(branch)
        info.show_info(b)


class cmd_remove(Command):
    """Make a file unversioned.

    This makes bzr stop tracking changes to a versioned file.  It does
    not delete the working copy.
    """
    takes_args = ['file+']
    takes_options = ['verbose']
    
    def run(self, file_list, verbose=False):
        b = Branch(file_list[0])
        b.remove([b.relpath(f) for f in file_list], verbose=verbose)


class cmd_file_id(Command):
    """Print file_id of a particular file or directory.

    The file_id is assigned when the file is first added and remains the
    same through all revisions where the file exists, even when it is
    moved or renamed.
    """
    hidden = True
    takes_args = ['filename']
    def run(self, filename):
        b = Branch(filename)
        i = b.inventory.path2id(b.relpath(filename))
        if i == None:
            bailout("%r is not a versioned file" % filename)
        else:
            print i


class cmd_file_path(Command):
    """Print path of file_ids to a file or directory.

    This prints one line for each directory down to the target,
    starting at the branch root."""
    hidden = True
    takes_args = ['filename']
    def run(self, filename):
        b = Branch(filename)
        inv = b.inventory
        fid = inv.path2id(b.relpath(filename))
        if fid == None:
            bailout("%r is not a versioned file" % filename)
        for fip in inv.get_idpath(fid):
            print fip


class cmd_revision_history(Command):
    """Display list of revision ids on this branch."""
    hidden = True
    def run(self):
        for patchid in Branch('.').revision_history():
            print patchid


class cmd_directories(Command):
    """Display list of versioned directories in this branch."""
    def run(self):
        for name, ie in Branch('.').read_working_inventory().directories():
            if name == '':
                print '.'
            else:
                print name


class cmd_init(Command):
    """Make a directory into a versioned branch.

    Use this to create an empty branch, or before importing an
    existing project.

    Recipe for importing a tree of files:
        cd ~/project
        bzr init
        bzr add -v .
        bzr status
        bzr commit -m 'imported project'
    """
    def run(self):
        Branch('.', init=True)


class cmd_diff(Command):
    """Show differences in working tree.
    
    If files are listed, only the changes in those files are listed.
    Otherwise, all changes for the tree are listed.

    TODO: Given two revision arguments, show the difference between them.

    TODO: Allow diff across branches.

    TODO: Option to use external diff command; could be GNU diff, wdiff,
          or a graphical diff.

    TODO: Python difflib is not exactly the same as unidiff; should
          either fix it up or prefer to use an external diff.

    TODO: If a directory is given, diff everything under that.

    TODO: Selected-file diff is inefficient and doesn't show you
          deleted files.

    TODO: This probably handles non-Unix newlines poorly.
    """
    
    takes_args = ['file*']
    takes_options = ['revision', 'diff-options']
    aliases = ['di']

    def run(self, revision=None, file_list=None, diff_options=None):
        from bzrlib.diff import show_diff
        from bzrlib import find_branch

        if file_list:
            b = find_branch(file_list[0])
            file_list = [b.relpath(f) for f in file_list]
            if file_list == ['']:
                # just pointing to top-of-tree
                file_list = None
        else:
            b = Branch('.')
    
        show_diff(b, revision, specific_files=file_list,
                  external_diff_options=diff_options)


        


class cmd_deleted(Command):
    """List files deleted in the working tree.

    TODO: Show files deleted since a previous revision, or between two revisions.
    """
    def run(self, show_ids=False):
        b = Branch('.')
        old = b.basis_tree()
        new = b.working_tree()

        ## TODO: Much more efficient way to do this: read in new
        ## directories with readdir, rather than stating each one.  Same
        ## level of effort but possibly much less IO.  (Or possibly not,
        ## if the directories are very large...)

        for path, ie in old.inventory.iter_entries():
            if not new.has_id(ie.file_id):
                if show_ids:
                    print '%-50s %s' % (path, ie.file_id)
                else:
                    print path


class cmd_modified(Command):
    """List files modified in working tree."""
    hidden = True
    def run(self):
        import statcache
        b = Branch('.')
        inv = b.read_working_inventory()
        sc = statcache.update_cache(b, inv)
        basis = b.basis_tree()
        basis_inv = basis.inventory
        
        # We used to do this through iter_entries(), but that's slow
        # when most of the files are unmodified, as is usually the
        # case.  So instead we iterate by inventory entry, and only
        # calculate paths as necessary.

        for file_id in basis_inv:
            cacheentry = sc.get(file_id)
            if not cacheentry:                 # deleted
                continue
            ie = basis_inv[file_id]
            if cacheentry[statcache.SC_SHA1] != ie.text_sha1:
                path = inv.id2path(file_id)
                print path



class cmd_added(Command):
    """List files added in working tree."""
    hidden = True
    def run(self):
        b = Branch('.')
        wt = b.working_tree()
        basis_inv = b.basis_tree().inventory
        inv = wt.inventory
        for file_id in inv:
            if file_id in basis_inv:
                continue
            path = inv.id2path(file_id)
            if not os.access(b.abspath(path), os.F_OK):
                continue
            print path
                
        

class cmd_root(Command):
    """Show the tree root directory.

    The root is the nearest enclosing directory with a .bzr control
    directory."""
    takes_args = ['filename?']
    def run(self, filename=None):
        """Print the branch root."""
        from branch import find_branch
        b = find_branch(filename)
        print getattr(b, 'base', None) or getattr(b, 'baseurl')


class cmd_log(Command):
    """Show log of this branch.

    To request a range of logs, you can use the command -r begin:end
    -r revision requests a specific revision, -r :end or -r begin: are
    also valid.

    TODO: Make --revision support uuid: and hash: [future tag:] notation.
  
    """

    takes_args = ['filename?']
    takes_options = ['forward', 'timezone', 'verbose', 'show-ids', 'revision']
    
    def run(self, filename=None, timezone='original',
            verbose=False,
            show_ids=False,
            forward=False,
            revision=None):
        from bzrlib import show_log, find_branch
        import codecs

        direction = (forward and 'forward') or 'reverse'
        
        if filename:
            b = find_branch(filename)
            fp = b.relpath(filename)
            if fp:
                file_id = b.read_working_inventory().path2id(fp)
            else:
                file_id = None  # points to branch root
        else:
            b = find_branch('.')
            file_id = None

        if revision == None:
            revision = [None, None]
        elif isinstance(revision, int):
            revision = [revision, revision]
        else:
            # pair of revisions?
            pass
            
        assert len(revision) == 2

        mutter('encoding log as %r' % bzrlib.user_encoding)
        outf = codecs.getwriter(bzrlib.user_encoding)(sys.stdout)

        show_log(b, file_id,
                 show_timezone=timezone,
                 verbose=verbose,
                 show_ids=show_ids,
                 to_file=outf,
                 direction=direction,
                 start_revision=revision[0],
                 end_revision=revision[1])



class cmd_touching_revisions(Command):
    """Return revision-ids which affected a particular file.

    A more user-friendly interface is "bzr log FILE"."""
    hidden = True
    takes_args = ["filename"]
    def run(self, filename):
        b = Branch(filename)
        inv = b.read_working_inventory()
        file_id = inv.path2id(b.relpath(filename))
        for revno, revision_id, what in bzrlib.log.find_touching_revisions(b, file_id):
            print "%6d %s" % (revno, what)


class cmd_ls(Command):
    """List files in a tree.

    TODO: Take a revision or remote path and list that tree instead.
    """
    hidden = True
    def run(self, revision=None, verbose=False):
        b = Branch('.')
        if revision == None:
            tree = b.working_tree()
        else:
            tree = b.revision_tree(b.lookup_revision(revision))

        for fp, fc, kind, fid in tree.list_files():
            if verbose:
                if kind == 'directory':
                    kindch = '/'
                elif kind == 'file':
                    kindch = ''
                else:
                    kindch = '???'

                print '%-8s %s%s' % (fc, fp, kindch)
            else:
                print fp



class cmd_unknowns(Command):
    """List unknown files"""
    def run(self):
        for f in Branch('.').unknowns():
            print quotefn(f)



class cmd_ignore(Command):
    """Ignore a command or pattern

    To remove patterns from the ignore list, edit the .bzrignore file.

    If the pattern contains a slash, it is compared to the whole path
    from the branch root.  Otherwise, it is comapred to only the last
    component of the path.

    Ignore patterns are case-insensitive on case-insensitive systems.

    Note: wildcards must be quoted from the shell on Unix.

    examples:
        bzr ignore ./Makefile
        bzr ignore '*.class'
    """
    takes_args = ['name_pattern']
    
    def run(self, name_pattern):
        from bzrlib.atomicfile import AtomicFile
        import os.path

        b = Branch('.')
        ifn = b.abspath('.bzrignore')

        if os.path.exists(ifn):
            f = open(ifn, 'rt')
            try:
                igns = f.read().decode('utf-8')
            finally:
                f.close()
        else:
            igns = ''

        # TODO: If the file already uses crlf-style termination, maybe
        # we should use that for the newly added lines?

        if igns and igns[-1] != '\n':
            igns += '\n'
        igns += name_pattern + '\n'

        try:
            f = AtomicFile(ifn, 'wt')
            f.write(igns.encode('utf-8'))
            f.commit()
        finally:
            f.close()

        inv = b.working_tree().inventory
        if inv.path2id('.bzrignore'):
            mutter('.bzrignore is already versioned')
        else:
            mutter('need to make new .bzrignore file versioned')
            b.add(['.bzrignore'])



class cmd_ignored(Command):
    """List ignored files and the patterns that matched them.

    See also: bzr ignore"""
    def run(self):
        tree = Branch('.').working_tree()
        for path, file_class, kind, file_id in tree.list_files():
            if file_class != 'I':
                continue
            ## XXX: Slightly inefficient since this was already calculated
            pat = tree.is_ignored(path)
            print '%-50s %s' % (path, pat)


class cmd_lookup_revision(Command):
    """Lookup the revision-id from a revision-number

    example:
        bzr lookup-revision 33
    """
    hidden = True
    takes_args = ['revno']
    
    def run(self, revno):
        try:
            revno = int(revno)
        except ValueError:
            raise BzrCommandError("not a valid revision-number: %r" % revno)

        print Branch('.').lookup_revision(revno)


class cmd_export(Command):
    """Export past revision to destination directory.

    If no revision is specified this exports the last committed revision."""
    takes_args = ['dest']
    takes_options = ['revision']
    def run(self, dest, revision=None):
        b = Branch('.')
        if revision == None:
            rh = b.revision_history()[-1]
        else:
            rh = b.lookup_revision(int(revision))
        t = b.revision_tree(rh)
        t.export(dest)


class cmd_cat(Command):
    """Write a file's text from a previous revision."""

    takes_options = ['revision']
    takes_args = ['filename']

    def run(self, filename, revision=None):
        if revision == None:
            raise BzrCommandError("bzr cat requires a revision number")
        b = Branch('.')
        b.print_file(b.relpath(filename), int(revision))


class cmd_local_time_offset(Command):
    """Show the offset in seconds from GMT to local time."""
    hidden = True    
    def run(self):
        print bzrlib.osutils.local_time_offset()



class cmd_commit(Command):
    """Commit changes into a new revision.

    If selected files are specified, only changes to those files are
    committed.  If a directory is specified then its contents are also
    committed.

    A selected-file commit may fail in some cases where the committed
    tree would be invalid, such as trying to commit a file in a
    newly-added directory that is not itself committed.

    TODO: Run hooks on tree to-be-committed, and after commit.

    TODO: Strict commit that fails if there are unknown or deleted files.
    """
    takes_args = ['selected*']
    takes_options = ['message', 'file', 'verbose']
    aliases = ['ci', 'checkin']

    def run(self, message=None, file=None, verbose=True, selected_list=None):
        from bzrlib.commit import commit

        ## Warning: shadows builtin file()
        if not message and not file:
            raise BzrCommandError("please specify a commit message",
                                  ["use either --message or --file"])
        elif message and file:
            raise BzrCommandError("please specify either --message or --file")
        
        if file:
            import codecs
            message = codecs.open(file, 'rt', bzrlib.user_encoding).read()

        b = Branch('.')
        commit(b, message, verbose=verbose, specific_files=selected_list)


class cmd_check(Command):
    """Validate consistency of branch history.

    This command checks various invariants about the branch storage to
    detect data corruption or bzr bugs.
    """
    takes_args = ['dir?']
    def run(self, dir='.'):
        import bzrlib.check
        bzrlib.check.check(Branch(dir))



class cmd_whoami(Command):
    """Show bzr user id."""
    takes_options = ['email']
    
    def run(self, email=False):
        if email:
            print bzrlib.osutils.user_email()
        else:
            print bzrlib.osutils.username()


class cmd_selftest(Command):
    """Run internal test suite"""
    hidden = True
    def run(self):
        failures, tests = 0, 0

        import doctest, bzrlib.store
        bzrlib.trace.verbose = False

        for m in bzrlib.store, bzrlib.inventory, bzrlib.branch, bzrlib.osutils, \
            bzrlib.tree, bzrlib.commands, bzrlib.add:
            mf, mt = doctest.testmod(m)
            failures += mf
            tests += mt
            print '%-40s %3d tests' % (m.__name__, mt),
            if mf:
                print '%3d FAILED!' % mf
            else:
                print

        print '%-40s %3d tests' % ('total', tests),
        if failures:
            print '%3d FAILED!' % failures
            return 1
        else:
            print
            return 0



class cmd_version(Command):
    """Show version of bzr"""
    def run(self):
        show_version()

def show_version():
    print "bzr (bazaar-ng) %s" % bzrlib.__version__
    print bzrlib.__copyright__
    print "http://bazaar-ng.org/"
    print
    print "bzr comes with ABSOLUTELY NO WARRANTY.  bzr is free software, and"
    print "you may use, modify and redistribute it under the terms of the GNU"
    print "General Public License version 2 or later."


class cmd_rocks(Command):
    """Statement of optimism."""
    hidden = True
    def run(self):
        print "it sure does!"

def parse_spec(spec):
    if '/@' in spec:
        parsed = spec.split('/@')
        assert len(parsed) == 2
        if parsed[1] == "":
            parsed[1] = -1
        else:
            parsed[1] = int(parsed[1])
            assert parsed[1] >=0
    else:
        parsed = [spec, None]
    return parsed

class cmd_merge(Command):
    """Perform a three-way merge of trees."""
    takes_args = ['other_spec', 'base_spec']

    def run(self, other_spec, base_spec):
        from bzrlib.merge import merge
        merge(parse_spec(other_spec), parse_spec(base_spec))

class cmd_assert_fail(Command):
    """Test reporting of assertion failures"""
    hidden = True
    def run(self):
        assert False, "always fails"


class cmd_help(Command):
    """Show help on a command or other topic.

    For a list of all available commands, say 'bzr help commands'."""
    takes_args = ['topic?']
    aliases = ['?']
    
    def run(self, topic=None):
        import help
        help.help(topic)


class cmd_update_stat_cache(Command):
    """Update stat-cache mapping inodes to SHA-1 hashes.

    For testing only."""
    hidden = True
    def run(self):
        import statcache
        b = Branch('.')
        statcache.update_cache(b.base, b.read_working_inventory())



# 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,
    'forward':                None,
    'message':                unicode,
    'profile':                None,
    'revision':               _parse_revision_str,
    'show-ids':               None,
    'timezone':               str,
    'verbose':                None,
    'version':                None,
    'email':                  None,
    }

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


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('--version'.split())
    ([], {'version': True})
    >>> parse_args('status --all'.split())
    (['status'], {'all': True})
    >>> parse_args('commit --message=biter'.split())
    (['commit'], {'message': u'biter'})
    """
    args = []
    opts = {}

    # TODO: Maybe handle '--' to end options?

    while argv:
        a = argv.pop(0)
        if a[0] == '-':
            # option names must not be unicode
            a = str(a)
            optarg = None
            if a[1] == '-':
                mutter("  got option %r" % a)
                if '=' in a:
                    optname, optarg = a[2:].split('=', 1)
                else:
                    optname = a[2:]
                if optname not in OPTIONS:
                    bailout('unknown long option %r' % a)
            else:
                shortopt = a[1:]
                if shortopt not in SHORT_OPTIONS:
                    bailout('unknown short option %r' % a)
                optname = SHORT_OPTIONS[shortopt]
            
            if optname in opts:
                # XXX: Do we ever want to support this, e.g. for -r?
                bailout('repeated option %r' % a)
                
            optargfn = OPTIONS[optname]
            if optargfn:
                if optarg == None:
                    if not argv:
                        bailout('option %r needs an argument' % a)
                    else:
                        optarg = argv.pop(0)
                opts[optname] = optargfn(optarg)
            else:
                if optarg != None:
                    bailout('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 run_bzr(argv):
    """Execute a command.

    This is similar to main(), but without all the trappings for
    logging and error handling.  
    """
    argv = [a.decode(bzrlib.user_encoding) for a in argv]
    
    try:
        args, opts = parse_args(argv[1:])
        if 'help' in opts:
            import help
            if args:
                help.help(args[0])
            else:
                help.help()
            return 0
        elif 'version' in opts:
            show_version()
            return 0
        cmd = str(args.pop(0))
    except IndexError:
        import help
        help.help()
        return 1
          

    canonical_cmd, cmd_class = get_cmd_class(cmd)

    # global option
    if 'profile' in opts:
        profile = True
        del opts['profile']
    else:
        profile = False

    # check options are reasonable
    allowed = cmd_class.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_class.takes_args, args)
    cmdopts = {}
    for k, v in opts.items():
        cmdopts[k.replace('-', '_')] = v

    if profile:
        import hotshot, tempfile
        pffileno, pfname = tempfile.mkstemp()
        try:
            prof = hotshot.Profile(pfname)
            ret = prof.runcall(cmd_class, cmdopts, cmdargs) or 0
            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.status

        finally:
            os.close(pffileno)
            os.remove(pfname)
    else:
        return cmd_class(cmdopts, cmdargs).status 


def _report_exception(summary, quiet=False):
    import traceback
    log_error('bzr: ' + summary)
    bzrlib.trace.log_exception()

    if not quiet:
        tb = sys.exc_info()[2]
        exinfo = traceback.extract_tb(tb)
        if exinfo:
            sys.stderr.write('  at %s:%d in %s()\n' % exinfo[-1][:3])
        sys.stderr.write('  see ~/.bzr.log for debug information\n')



def main(argv):
    import errno
    
    bzrlib.open_tracefile(argv)

    try:
        try:
            try:
                return run_bzr(argv)
            finally:
                # do this here inside the exception wrappers to catch EPIPE
                sys.stdout.flush()
        except BzrError, e:
            quiet = isinstance(e, (BzrCommandError))
            _report_exception('error: ' + e.args[0], quiet=quiet)
            if len(e.args) > 1:
                for h in e.args[1]:
                    # some explanation or hints
                    log_error('  ' + h)
            return 1
        except AssertionError, e:
            msg = 'assertion failed'
            if str(e):
                msg += ': ' + str(e)
            _report_exception(msg)
            return 2
        except KeyboardInterrupt, e:
            _report_exception('interrupted', quiet=True)
            return 2
        except Exception, e:
            quiet = False
            if (isinstance(e, IOError) 
                and hasattr(e, 'errno')
                and e.errno == errno.EPIPE):
                quiet = True
                msg = 'broken pipe'
            else:
                msg = str(e).rstrip('\n')
            _report_exception(msg, quiet)
            return 2
    finally:
        bzrlib.trace.close_trace()


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