# Copyright (C) 2004 Aaron Bentley
# <aaron.bentley@utoronto.ca>
#
#    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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

import sys
import arch
import arch.util
import arch.arch

import pylon.errors
from pylon.errors import *
from pylon import errors
from pylon import util
from pylon import arch_core
from pylon import arch_compound
from pylon import ancillary
from pylon import misc
from pylon import paths 

import abacmds
import cmdutil
import shutil
import os
import options
import time
import cmd
import readline
import re
import string
import terminal
import email
import smtplib
import textwrap

__docformat__ = "restructuredtext"
__doc__ = "Implementation of user (sub) commands"
commands = {}

def find_command(cmd):
    """
    Return an instance of a command type.  Return None if the type isn't
    registered.

    :param cmd: the name of the command to look for
    :type cmd: the type of the command
    """
    if commands.has_key(cmd):
        return commands[cmd]()
    else:
        return None

class BaseCommand:
    def __call__(self, cmdline):
        try:
            self.do_command(cmdline.split())
        except cmdutil.GetHelp, e:
            self.help()
        except Exception, e:
            print e

    def get_completer(index):
        return None

    def complete(self, args, text):
        """
        Returns a list of possible completions for the given text.

        :param args: The complete list of arguments
        :type args: List of str
        :param text: text to complete (may be shorter than args[-1])
        :type text: str
        :rtype: list of str
        """
        matches = []
        candidates = None

        if len(args) > 0: 
            realtext = args[-1]
        else:
            realtext = ""

        try:
            parser=self.get_parser()
            if realtext.startswith('-'):
                candidates = parser.iter_options()
            else:
                (options, parsed_args) = parser.parse_args(args)

                if len (parsed_args) > 0:
                    candidates = self.get_completer(parsed_args[-1], len(parsed_args) -1)
                else:
                    candidates = self.get_completer("", 0)
        except:
            pass
        if candidates is None:
            return
        for candidate in candidates:
            candidate = str(candidate)
            if candidate.startswith(realtext):
                matches.append(candidate[len(realtext)- len(text):])
        return matches


class Help(BaseCommand):
    """
    Lists commands, prints help messages.
    """
    def __init__(self):
        self.description="Prints help mesages"
        self.parser = None

    def do_command(self, cmdargs):
        """
        Prints a help message.
        """
        options, args = self.get_parser().parse_args(cmdargs)
        if len(args) > 1:
            raise cmdutil.GetHelp

        if options.native or options.suggestions or options.external:
            native = options.native
            suggestions = options.suggestions
            external = options.external
        else:
            native = True
            suggestions = False
            external = True
        
        if len(args) == 0:
            self.list_commands(native, suggestions, external)
            return
        elif len(args) == 1:
            command_help(args[0])
            return

    def help(self):
        self.get_parser().print_help()
        print """
If no command is specified, commands are listed.  If a command is
specified, help for that command is listed.
        """

    def get_parser(self):
        """
        Returns the options parser to use for the "revision" command.

        :rtype: cmdutil.CmdOptionParser
        """
        if self.parser is not None:
            return self.parser
        parser=cmdutil.CmdOptionParser("fai help [command]")
        parser.add_option("-n", "--native", action="store_true", 
                         dest="native", help="Show native commands")
        parser.add_option("-e", "--external", action="store_true", 
                         dest="external", help="Show external commands")
        parser.add_option("-s", "--suggest", action="store_true", 
                         dest="suggestions", help="Show suggestions")
        self.parser = parser
        return parser 
      
    def list_commands(self, native=True, suggest=False, external=True):
        """
        Lists supported commands.

        :param native: list native, python-based commands
        :type native: bool
        :param external: list external aba-style commands
        :type external: bool
        """
        if native:
            print "Native Fai commands"
            keys=commands.keys()
            keys.sort()
            for k in keys:
                space=""
                for i in range(28-len(k)):
                    space+=" "
                print space+k+" : "+commands[k]().description
            print
        if suggest:
            print "Unavailable commands and suggested alternatives"
            key_list = suggestions.keys()
            key_list.sort()
            for key in key_list:
                print "%28s : %s" % (key, suggestions[key])
            print
        if external:
            fake_aba = abacmds.AbaCmds()
            if (fake_aba.abadir == ""):
                return
            print "External commands"
            fake_aba.list_commands()
            print
        if not suggest:
            print "Use help --suggest to list alternatives to tla and aba"\
                " commands."
        if options.tla_fallthrough and (native or external):
            print "Fai also supports tla commands."

def command_help(cmd):
    """
    Prints help for a command.

    :param cmd: The name of the command to print help for
    :type cmd: str
    """
    fake_aba = abacmds.AbaCmds()
    cmdobj = find_command(cmd)
    if cmdobj != None:
        cmdobj.help()
    elif suggestions.has_key(cmd):
        print "Not available\n" + suggestions[cmd]
    else:
        abacmd = fake_aba.is_command(cmd)
        if abacmd:
            abacmd.help()
        else:
            print "No help is available for \""+cmd+"\". Maybe try \"tla "+cmd+" -H\"?"



class Changes(BaseCommand):
    """
    the "changes" command: lists differences between trees/revisions:
    """
    
    def __init__(self):
        self.description="Lists what files have changed in the project tree"

    def get_completer(self, arg, index):
        if index > 1:
            return None
        try:
            tree = arch.tree_root()
        except:
            tree = None
        return cmdutil.iter_revision_completions(arg, tree)
    
    def parse_commandline(self, cmdline):
        """
        Parse commandline arguments.  Raises cmdutil.GetHelp if help is needed.
        
        :param cmdline: A list of arguments to parse
        :rtype: (options, Revision, Revision/WorkingTree)
        """
        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdline)
        if len(args) > 2:
            raise cmdutil.GetHelp

        tree=arch.tree_root()
        if len(args) == 0:
            a_spec = ancillary.comp_revision(tree)
        else:
            a_spec = cmdutil.determine_revision_tree(tree, args[0])
        cmdutil.ensure_archive_registered(a_spec.archive)
        if len(args) == 2:
            b_spec = cmdutil.determine_revision_tree(tree, args[1])
            cmdutil.ensure_archive_registered(b_spec.archive)
        else:
            b_spec=tree
        return options, a_spec, b_spec

    def do_command(self, cmdargs):
        """
        Master function that perfoms the "changes" command.
        """
        try:
            options, a_spec, b_spec = self.parse_commandline(cmdargs);
        except cmdutil.CantDetermineRevision, e:
            print e
            return
        except arch.errors.TreeRootError, e:
            print e
            return
        if options.changeset:
            changeset=options.changeset
            tmpdir = None
        else:
            tmpdir=util.tmpdir()
            changeset=tmpdir+"/changeset"
        try:
            delta=arch.iter_delta(a_spec, b_spec, changeset)
            try:
                for line in delta:
                    if cmdutil.chattermatch(line, "changeset:"):
                        pass
                    else:
                        cmdutil.colorize(line, options.suppress_chatter)
            except arch.util.ExecProblem, e:
                if e.proc.error and e.proc.error.startswith(
                    "missing explicit id for file"):
                    raise MissingID(e)
                else:
                    raise
            status=delta.status
            if status > 1:
                return
            if (options.perform_diff):
                chan = arch_compound.ChangesetMunger(changeset)
                chan.read_indices()
                if options.diffopts is not None:
                    if isinstance(b_spec, arch.Revision):
                        b_dir = b_spec.library_find()
                    else:
                        b_dir = b_spec
                    a_dir = a_spec.library_find()
                    diffopts = options.diffopts.split()
                    cmdutil.show_custom_diffs(chan, diffopts, a_dir, b_dir)
                else:
                    cmdutil.show_diffs(delta.changeset)
        finally:
            if tmpdir and (os.access(tmpdir, os.X_OK)):
                shutil.rmtree(tmpdir)

    def get_parser(self):
        """
        Returns the options parser to use for the "changes" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai changes [options] [revision]"
                                       " [revision]")
        parser.add_option("-d", "--diff", action="store_true", 
                          dest="perform_diff", default=False, 
                          help="Show diffs in summary")
        parser.add_option("-c", "--changeset", dest="changeset", 
                          help="Store a changeset in the given directory", 
                          metavar="DIRECTORY")
        parser.add_option("-s", "--silent", action="store_true", 
                          dest="suppress_chatter", default=False, 
                          help="Suppress chatter messages")
        parser.add_option("--diffopts", dest="diffopts", 
                          help="Use the specified diff options", 
                          metavar="OPTIONS")

        return parser

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser is None:
            parser=self.get_parser()
        parser.print_help()
        print """
Performs source-tree comparisons

If no revision is specified, the current project tree is compared to the
last-committed revision.  If one revision is specified, the current project
tree is compared to that revision.  If two revisions are specified, they are
compared to each other.
        """
        help_tree_spec() 
        return


class ApplyChanges(BaseCommand):
    """
    Apply differences between two revisions to a tree
    """
    
    def __init__(self):
        self.description="Applies changes to a project tree"
    
    def get_completer(self, arg, index):
        if index > 1:
            return None
        try:
            tree = arch.tree_root()
        except:
            tree = None
        return cmdutil.iter_revision_completions(arg, tree)

    def parse_commandline(self, cmdline, tree):
        """
        Parse commandline arguments.  Raises cmdutil.GetHelp if help is needed.
        
        :param cmdline: A list of arguments to parse
        :rtype: (options, Revision, Revision/WorkingTree)
        """
        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdline)
        if len(args) != 2:
            raise cmdutil.GetHelp

        a_spec = cmdutil.determine_revision_tree(tree, args[0])
        cmdutil.ensure_archive_registered(a_spec.archive)
        b_spec = cmdutil.determine_revision_tree(tree, args[1])
        cmdutil.ensure_archive_registered(b_spec.archive)
        return options, a_spec, b_spec

    def do_command(self, cmdargs):
        """
        Master function that performs "apply-changes".
        """
        try:
            tree = arch.tree_root()
            options, a_spec, b_spec = self.parse_commandline(cmdargs, tree);
        except cmdutil.CantDetermineRevision, e:
            print e
            return
        except arch.errors.TreeRootError, e:
            print e
            return
        delta=cmdutil.apply_delta(a_spec, b_spec, tree)
        for line in cmdutil.iter_apply_delta_filter(delta):
            cmdutil.colorize(line, options.suppress_chatter)

    def get_parser(self):
        """
        Returns the options parser to use for the "apply-changes" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai apply-changes [options] revision"
                                       " revision")
        parser.add_option("-d", "--diff", action="store_true", 
                          dest="perform_diff", default=False, 
                          help="Show diffs in summary")
        parser.add_option("-c", "--changeset", dest="changeset", 
                          help="Store a changeset in the given directory", 
                          metavar="DIRECTORY")
        parser.add_option("-s", "--silent", action="store_true", 
                          dest="suppress_chatter", default=False, 
                          help="Suppress chatter messages")
        return parser

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser is None:
            parser=self.get_parser()
        parser.print_help()
        print """
Applies changes to a project tree

Compares two revisions and applies the difference between them to the current
tree.
        """
        help_tree_spec() 
        return

class Update(BaseCommand):
    """
    Updates a project tree to a given revision, preserving un-committed hanges. 
    """
    
    def __init__(self):
        self.description="Apply the latest changes to the current directory"

    def get_completer(self, arg, index):
        if index > 0:
            return None
        try:
            tree = arch.tree_root()
        except:
            tree = None
        return cmdutil.iter_revision_completions(arg, tree)
    
    def parse_commandline(self, cmdline, tree):
        """
        Parse commandline arguments.  Raises cmdutil.GetHelp if help is needed.
        
        :param cmdline: A list of arguments to parse
        :rtype: (options, Revision, Revision/WorkingTree)
        """
        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdline)
        if len(args) > 2:
            raise cmdutil.GetHelp

        spec=None
        if len(args)>0:
            spec=args[0]
        revision=cmdutil.determine_revision_arch(tree, spec)
        cmdutil.ensure_archive_registered(revision.archive)

        mirror_source = cmdutil.get_mirror_source(revision.archive)
        if mirror_source != None:
            if cmdutil.prompt("Mirror update"):
                cmd=cmdutil.mirror_archive(mirror_source, 
                    revision.archive, arch.NameParser(revision).get_package_version())
                for line in arch.chatter_classifier(cmd):
                    cmdutil.colorize(line, options.suppress_chatter)

                revision=cmdutil.determine_revision_arch(tree, spec)

        return options, revision 

    def do_command(self, cmdargs):
        """
        Master function that perfoms the "update" command.
        """
        tree=arch.tree_root()
        try:
            options, to_revision = self.parse_commandline(cmdargs, tree);
        except cmdutil.CantDetermineRevision, e:
            print e
            return
        except arch.errors.TreeRootError, e:
            print e
            return
        from_revision = arch_compound.tree_latest(tree)
        if from_revision==to_revision:
            print "Tree is already up to date with:\n"+str(to_revision)+"."
            return
        cmdutil.ensure_archive_registered(from_revision.archive)
        cmd=cmdutil.apply_delta(from_revision, to_revision, tree,
            options.patch_forward)
        for line in cmdutil.iter_apply_delta_filter(cmd):
            cmdutil.colorize(line)
        if to_revision.version != tree.tree_version:
            if cmdutil.prompt("Update version"):
                tree.tree_version = to_revision.version

    def get_parser(self):
        """
        Returns the options parser to use for the "update" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai update [options]"
                                       " [revision/version]")
        parser.add_option("-f", "--forward", action="store_true", 
                          dest="patch_forward", default=False, 
                          help="pass the --forward option to 'patch'")
        parser.add_option("-s", "--silent", action="store_true", 
                          dest="suppress_chatter", default=False, 
                          help="Suppress chatter messages")
        return parser

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser is None:
            parser=self.get_parser()
        parser.print_help()
        print """
Updates a working tree to the current archive revision

If a revision or version is specified, that is used instead 
        """
        help_tree_spec() 
        return


class Commit(BaseCommand):
    """
    Create a revision based on the changes in the current tree.
    """
    
    def __init__(self):
        self.description="Write local changes to the archive"

    def get_completer(self, arg, index):
        if arg is None:
            arg = ""
        return iter_modified_file_completions(arch.tree_root(), arg)
#        return iter_source_file_completions(arch.tree_root(), arg)
    
    def parse_commandline(self, cmdline, tree):
        """
        Parse commandline arguments.  Raise cmtutil.GetHelp if help is needed.
        
        :param cmdline: A list of arguments to parse
        :rtype: (options, Revision, Revision/WorkingTree)
        """
        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdline)

        if len(args) == 0:
            args = None
        if options.version is None:
            return options, tree.tree_version, args

        revision=cmdutil.determine_revision_arch(tree, options.version)
        return options, revision.get_version(), args

    def do_command(self, cmdargs):
        """
        Master function that perfoms the "commit" command.
        """
        tree=arch.tree_root()
        options, version, files = self.parse_commandline(cmdargs, tree)
        ancestor = None
        if options.__dict__.has_key("base") and options.base:
            base = cmdutil.determine_revision_tree(tree, options.base)
            ancestor = base
        else:
            base = ancillary.submit_revision(tree)
            ancestor = base
        if ancestor is None:
            ancestor = arch_compound.tree_latest(tree, version)

        writeversion=version
        archive=version.archive
        source=cmdutil.get_mirror_source(archive)
        allow_old=False
        writethrough="implicit"

        if source!=None:
            if writethrough=="explicit" and \
                cmdutil.prompt("Writethrough"):
                writeversion=arch.Version(str(source)+"/"+str(version.get_nonarch()))
            elif writethrough=="none":
                raise CommitToMirror(archive)

        elif archive.is_mirror:
            raise CommitToMirror(archive)

        try:
            last_revision=tree.iter_logs(version, True).next().revision
        except StopIteration, e:
            last_revision = None
            if ancestor is None:
                if cmdutil.prompt("Import from commit"):
                    return do_import(version)
                else:
                    raise NoVersionLogs(version)
        try:
            arch_last_revision = version.iter_revisions(True).next()
        except StopIteration, e:
            arch_last_revision = None
 
        if last_revision != arch_last_revision:
            print "Tree is not up to date with %s" % str(version)
            if not cmdutil.prompt("Out of date"):
                raise OutOfDate
            else:
                allow_old=True

        try:
            if not cmdutil.has_changed(ancestor):
                if not cmdutil.prompt("Empty commit"):
                    raise EmptyCommit
        except arch.util.ExecProblem, e:
            if e.proc.error and e.proc.error.startswith(
                "missing explicit id for file"):
                raise MissingID(e)
            else:
                raise
        log = tree.log_message(create=False, version=version)
        if log is None:
            try:
                if cmdutil.prompt("Create log"):
                    edit_log(tree, version)

            except cmdutil.NoEditorSpecified, e:
                raise CommandFailed(e)
            log = tree.log_message(create=False, version=version)
        if log is None: 
            raise NoLogMessage
        if log["Summary"] is None or len(log["Summary"].strip()) == 0:
            if not cmdutil.prompt("Omit log summary"):
                raise errors.NoLogSummary
        try:
            for line in tree.iter_commit(version, seal=options.seal_version,
                base=base, out_of_date_ok=allow_old, file_list=files):
                cmdutil.colorize(line, options.suppress_chatter)

        except arch.util.ExecProblem, e:
            if e.proc.error and e.proc.error.startswith(
                "These files violate naming conventions:"):
                raise LintFailure(e.proc.error)
            else:
                raise

    def get_parser(self):
        """
        Returns the options parser to use for the "commit" command.

        :rtype: cmdutil.CmdOptionParser
        """

        parser=cmdutil.CmdOptionParser("fai commit [options] [file1]"
                                       " [file2...]")
        parser.add_option("--seal", action="store_true", 
                          dest="seal_version", default=False, 
                          help="seal this version")
        parser.add_option("-v", "--version", dest="version", 
                          help="Use the specified version", 
                          metavar="VERSION")
        parser.add_option("-s", "--silent", action="store_true", 
                          dest="suppress_chatter", default=False, 
                          help="Suppress chatter messages")
        if cmdutil.supports_switch("commit", "--base"):
            parser.add_option("--base", dest="base", help="", 
                              metavar="REVISION")
        return parser

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser is None:
            parser=self.get_parser()
        parser.print_help()
        print """
Updates a working tree to the current archive revision

If a version is specified, that is used instead 
        """
#        help_tree_spec() 
        return



class CatLog(BaseCommand):
    """
    Print the log of a given file (from current tree)
    """
    def __init__(self):
        self.description="Prints the patch log for a revision"

    def get_completer(self, arg, index):
        if index > 0:
            return None
        try:
            tree = arch.tree_root()
        except:
            tree = None
        return cmdutil.iter_revision_completions(arg, tree)

    def do_command(self, cmdargs):
        """
        Master function that perfoms the "cat-log" command.
        """
        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdargs)
        try:
            tree = arch.tree_root()
        except arch.errors.TreeRootError, e:
            tree = None
        spec=None
        if len(args) > 0:
            spec=args[0]
        if len(args) > 1:
            raise cmdutil.GetHelp()
        try:
            if tree:
                revision = cmdutil.determine_revision_tree(tree, spec)
            else:
                revision = cmdutil.determine_revision_arch(tree, spec)
        except cmdutil.CantDetermineRevision, e:
            raise CommandFailedWrapper(e)
        log = None
        
        use_tree = (options.source == "tree" or \
            (options.source == "any" and tree))
        use_arch = (options.source == "archive" or options.source == "any")
        
        log = None
        if use_tree:
            for log in tree.iter_logs(revision.get_version()):
                if log.revision == revision:
                    break
                else:
                    log = None
        if log is None and use_arch:
            cmdutil.ensure_revision_exists(revision)
            log = arch.Patchlog(revision)
        if log is not None:
            for item in log.items():
                print "%s: %s" % item
            print log.description

    def get_parser(self):
        """
        Returns the options parser to use for the "cat-log" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai cat-log [revision]")
        parser.add_option("--archive", action="store_const", dest="source",
                          const="archive", default="any",
                          help="Always get the log from the archive")
        parser.add_option("--tree", action="store_const", dest="source",
                          const="tree", help="Always get the log from the tree")
        return parser 

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser==None:
            parser=self.get_parser()
        parser.print_help()
        print """
Prints the log for the specified revision
        """
        help_tree_spec()
        return

class Revert(BaseCommand):
    """ Reverts a tree (or aspects of it) to a revision
    """
    def __init__(self):
        self.description="Reverts a tree (or aspects of it) to a revision "

    def get_completer(self, arg, index):
        if index > 0:
            return None
        try:
            tree = arch.tree_root()
        except:
            tree = None
        return iter_modified_file_completions(tree, arg)

    def do_command(self, cmdargs):
        """
        Master function that perfoms the "revert" command.
        """
        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdargs)
        try:
            tree = arch.tree_root()
        except arch.errors.TreeRootError, e:
            raise CommandFailed(e)
        spec=None
        if options.revision is not None:
            spec=options.revision
        try:
            if spec is not None:
                revision = cmdutil.determine_revision_tree(tree, spec)
            else:
                revision = ancillary.comp_revision(tree)
        except cmdutil.CantDetermineRevision, e:
            raise CommandFailedWrapper(e)
        munger = None

        if options.file_contents or options.file_perms or options.deletions\
            or options.additions or options.renames or options.hunk_prompt:
            munger = arch_compound.MungeOpts()
            munger.set_hunk_prompt(cmdutil.colorize, cmdutil.user_hunk_confirm,
                                   options.hunk_prompt)

        if len(args) > 0 or options.logs or options.pattern_files or \
            options.control:
            if munger is None:
                munger = cmdutil.arch_compound.MungeOpts(True)
                munger.all_types(True)
        if len(args) > 0:
            t_cwd = arch_compound.tree_cwd(tree)
            for name in args:
                if len(t_cwd) > 0:
                    t_cwd += "/"
                name = "./" + t_cwd + name
                munger.add_keep_file(name);

        if options.file_perms:
            munger.file_perms = True
        if options.file_contents:
            munger.file_contents = True
        if options.deletions:
            munger.deletions = True
        if options.additions:
            munger.additions = True
        if options.renames:
            munger.renames = True
        if options.logs:
            munger.add_keep_pattern('^\./\{arch\}/[^=].*')
        if options.control:
            munger.add_keep_pattern("/\.arch-ids|^\./\{arch\}|"\
                                    "/\.arch-inventory$")
        if options.pattern_files:
            munger.add_keep_pattern(options.pattern_files)
                
        for line in arch_compound.revert(tree, revision, munger, 
                                   not options.no_output):
            cmdutil.colorize(line)


    def get_parser(self):
        """
        Returns the options parser to use for the "cat-log" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai revert [options] [FILE...]")
        parser.add_option("", "--contents", action="store_true", 
                          dest="file_contents", 
                          help="Revert file content changes")
        parser.add_option("", "--permissions", action="store_true", 
                          dest="file_perms", 
                          help="Revert file permissions changes")
        parser.add_option("", "--deletions", action="store_true", 
                          dest="deletions", 
                          help="Restore deleted files")
        parser.add_option("", "--additions", action="store_true", 
                          dest="additions", 
                          help="Remove added files")
        parser.add_option("", "--renames", action="store_true", 
                          dest="renames", 
                          help="Revert file names")
        parser.add_option("--hunks", action="store_true", 
                          dest="hunk_prompt", default=False,
                          help="Prompt which hunks to revert")
        parser.add_option("--pattern-files", dest="pattern_files", 
                          help="Revert files that match this pattern", 
                          metavar="REGEX")
        parser.add_option("--logs", action="store_true", 
                          dest="logs", default=False,
                          help="Revert only logs")
        parser.add_option("--control-files", action="store_true", 
                          dest="control", default=False,
                          help="Revert logs and other control files")
        parser.add_option("-n", "--no-output", action="store_true", 
                          dest="no_output", 
                          help="Don't keep an undo changeset")
        parser.add_option("--revision", dest="revision", 
                          help="Revert to the specified revision", 
                          metavar="REVISION")
        return parser 

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser==None:
            parser=self.get_parser()
        parser.print_help()
        print """
Reverts changes in the current working tree.  If no flags are specified, all
types of changes are reverted.  Otherwise, only selected types of changes are
reverted.  

If a revision is specified on the commandline, differences between the current
tree and that revision are reverted.  If a version is specified, the current
tree is used to determine the revision.

If files are specified, only those files listed will have any changes applied.
To specify a renamed file, you can use either the old or new name. (or both!)

Unless "-n" is specified, reversions can be undone with "redo".
        """
        return

class Revision(BaseCommand):
    """
    Print a revision name based on a revision specifier
    """
    def __init__(self):
        self.description="Prints the name of a revision"

    def get_completer(self, arg, index):
        if index > 0:
            return None
        try:
            tree = arch.tree_root()
        except:
            tree = None
        return cmdutil.iter_revision_completions(arg, tree)

    def do_command(self, cmdargs):
        """
        Master function that perfoms the "revision" command.
        """
        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdargs)

        try:
            tree = arch.tree_root()
        except arch.errors.TreeRootError:
            tree = None

        spec=None
        if len(args) > 0:
            spec=args[0]
        if len(args) > 1:
            raise cmdutil.GetHelp
        try:
            if tree:
                revision = cmdutil.determine_revision_tree(tree, spec)
            else:
                revision = cmdutil.determine_revision_arch(tree, spec)
        except cmdutil.CantDetermineRevision, e:
            print str(e)
            return
        print options.display(revision)

    def get_parser(self):
        """
        Returns the options parser to use for the "revision" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai revision [revision]")
        parser.add_option("", "--location", action="store_const", 
                         const=paths.determine_path, dest="display", 
                         help="Show location instead of name", default=str)
        parser.add_option("--import", action="store_const", 
                         const=paths.determine_import_path, dest="display",  
                         help="Show location of import file")
        parser.add_option("--log", action="store_const", 
                         const=paths.determine_log_path, dest="display", 
                         help="Show location of log file")
        parser.add_option("--patch", action="store_const", 
                         dest="display", const=paths.determine_patch_path,
                         help="Show location of patchfile")
        parser.add_option("--continuation", action="store_const", 
                         const=paths.determine_continuation_path, 
                         dest="display",
                         help="Show location of continuation file")
        parser.add_option("--cacherev", action="store_const", 
                         const=paths.determine_cacherev_path, dest="display",
                         help="Show location of cacherev file")
        return parser 

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser==None:
            parser=self.get_parser()
        parser.print_help()
        print """
Expands aliases and prints the name of the specified revision.  Instead of
the name, several options can be used to print locations.  If more than one is
specified, the last one is used.
        """
        help_tree_spec()
        return

class Revisions(BaseCommand):
    """
    Print a revision name based on a revision specifier
    """
    def __init__(self):
        self.description="Lists revisions"
        self.cl_revisions = []
    
    def do_command(self, cmdargs):
        """
        Master function that perfoms the "revision" command.
        """
        (options, args) = self.get_parser().parse_args(cmdargs)
        if len(args) > 1:
            raise cmdutil.GetHelp
        try:
            self.tree = arch.tree_root()
        except arch.errors.TreeRootError:
            self.tree = None
        if options.type == "default":
            options.type = "archive"
        try:
            iter = cmdutil.revision_iterator(self.tree, options.type, args, 
                                             options.reverse, options.modified,
                                             options.shallow)
        except cmdutil.CantDetermineRevision, e:
            raise CommandFailedWrapper(e)
        except cmdutil.CantDetermineVersion, e:
            raise CommandFailedWrapper(e)
        if options.skip is not None:
            iter = cmdutil.iter_skip(iter, int(options.skip))

        try:
            for revision in iter:
                log = None
                if isinstance(revision, arch.Patchlog):
                    log = revision
                    revision=revision.revision
                out = options.display(revision)
                if out is not None:
                    print out
                if log is None and (options.summary or options.creator or 
                                    options.date or options.merges):
                    log = revision.patchlog
                if options.creator:
                    print "    %s" % log.creator
                if options.date:
                    print "    %s" % time.strftime('%Y-%m-%d %H:%M:%S %Z', log.date)
                if options.summary:
                    print "    %s" % log.summary
                if options.merges:
                    showed_title = False
                    for revision in log.merged_patches:
                        if not showed_title:
                            print "    Merged:"
                            showed_title = True
                        print "    %s" % revision
            if len(self.cl_revisions) > 0:
                print pylon.changelog_for_merge(self.cl_revisions)
        except pylon.errors.TreeRootNone:
            raise CommandFailedWrapper(
                Exception("This option can only be used in a project tree."))

    def changelog_append(self, revision):
        if isinstance(revision, arch.Revision):
            revision=arch.Patchlog(revision)
        self.cl_revisions.append(revision)
   
    def get_parser(self):
        """
        Returns the options parser to use for the "revision" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai revisions [version/revision]")
        select = cmdutil.OptionGroup(parser, "Selection options",
                          "Control which revisions are listed.  These options"
                          " are mutually exclusive.  If more than one is"
                          " specified, the last is used.")

        cmdutil.add_revision_iter_options(select)
        parser.add_option("", "--skip", dest="skip", 
                          help="Skip revisions.  Positive numbers skip from "
                          "beginning, negative skip from end.",
                          metavar="NUMBER")

        parser.add_option_group(select)

        format = cmdutil.OptionGroup(parser, "Revision format options",
                          "These control the appearance of listed revisions")
        format.add_option("", "--location", action="store_const", 
                         const=paths.determine_path, dest="display", 
                         help="Show location instead of name", default=str)
        format.add_option("--import", action="store_const", 
                         const=paths.determine_import_path, dest="display",  
                         help="Show location of import file")
        format.add_option("--log", action="store_const", 
                         const=paths.determine_log_path, dest="display", 
                         help="Show location of log file")
        format.add_option("--patch", action="store_const", 
                         dest="display", const=paths.determine_patch_path,
                         help="Show location of patchfile")
        format.add_option("--continuation", action="store_const", 
                         const=paths.determine_continuation_path, 
                         dest="display",
                         help="Show location of continuation file")
        format.add_option("--cacherev", action="store_const", 
                         const=paths.determine_cacherev_path, dest="display",
                         help="Show location of cacherev file")
        format.add_option("--changelog", action="store_const", 
                         const=self.changelog_append, dest="display",
                         help="Show location of cacherev file")
        parser.add_option_group(format)
        display = cmdutil.OptionGroup(parser, "Display format options",
                          "These control the display of data")
        display.add_option("-r", "--reverse", action="store_true", 
                          dest="reverse", help="Sort from newest to oldest")
        display.add_option("-s", "--summary", action="store_true", 
                          dest="summary", help="Show patchlog summary")
        display.add_option("-D", "--date", action="store_true", 
                          dest="date", help="Show patchlog date")
        display.add_option("-c", "--creator", action="store_true", 
                          dest="creator", help="Show the id that committed the"
                          " revision")
        display.add_option("-m", "--merges", action="store_true", 
                          dest="merges", help="Show the revisions that were"
                          " merged")
        parser.add_option_group(display)
        return parser 
    def help(self, parser=None):
        """Attempt to explain the revisions command
        
        :param parser: If supplied, used to determine options
        """
        if parser==None:
            parser=self.get_parser()
        parser.print_help()
        print """List revisions.
        """
        help_tree_spec()


class Get(BaseCommand):
    """
    Retrieve a revision from the archive
    """
    def __init__(self):
        self.description="Retrieve a revision from the archive"
        self.parser=self.get_parser()


    def get_completer(self, arg, index):
        if index > 0:
            return None
        try:
            tree = arch.tree_root()
        except:
            tree = None
        return cmdutil.iter_revision_completions(arg, tree)


    def do_command(self, cmdargs):
        """
        Master function that perfoms the "get" command.
        """
        (options, args) = self.parser.parse_args(cmdargs)
        if len(args) < 1:
            return self.help()            
        try:
            tree = arch.tree_root()
        except arch.errors.TreeRootError:
            tree = None
        
        arch_loc = None
        try:
            revision, arch_loc = paths.full_path_decode(args[0])
        except Exception, e:
            revision = cmdutil.determine_revision_arch(tree, args[0], 
                check_existence=False, allow_package=True)
        if len(args) > 1:
            directory = args[1]
        else:
            directory = str(revision.nonarch)
        if os.path.exists(directory):
            raise DirectoryExists(directory)
        cmdutil.ensure_archive_registered(revision.archive, arch_loc)
        try:
            cmdutil.ensure_revision_exists(revision)
        except cmdutil.NoSuchRevision, e:
            raise CommandFailedWrapper(e)

        link = cmdutil.prompt ("get link")
        for line in cmdutil.iter_get(revision, directory, link,
                                     options.no_pristine,
                                     options.no_greedy_add):
            cmdutil.colorize(line)

    def get_parser(self):
        """
        Returns the options parser to use for the "get" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai get revision [dir]")
        parser.add_option("--no-pristine", action="store_true", 
                         dest="no_pristine", 
                         help="Do not make pristine copy for reference")
        parser.add_option("--no-greedy-add", action="store_true", 
                         dest="no_greedy_add", 
                         help="Never add to greedy libraries")

        return parser 

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser==None:
            parser=self.get_parser()
        parser.print_help()
        print """
Expands aliases and constructs a project tree for a revision.  If the optional
"dir" argument is provided, the project tree will be stored in this directory.
        """
        help_tree_spec()
        return

class PromptCmd(cmd.Cmd):
    def __init__(self):
        cmd.Cmd.__init__(self)
        self.prompt = "Fai> "
        try:
            self.tree = arch.tree_root()
        except:
            self.tree = None
        self.set_title()
        self.set_prompt()
        self.fake_aba = abacmds.AbaCmds()
        self.identchars += '-'
        self.history_file = os.path.expanduser("~/.fai-history")
        readline.set_completer_delims(string.whitespace)
        if os.access(self.history_file, os.R_OK) and \
            os.path.isfile(self.history_file):
            readline.read_history_file(self.history_file)
        self.cwd = os.getcwd()

    def write_history(self):
        readline.write_history_file(self.history_file)

    def do_quit(self, args):
        self.write_history()
        sys.exit(0)

    def do_exit(self, args):
        self.do_quit(args)

    def do_EOF(self, args):
        print
        self.do_quit(args)

    def postcmd(self, line, bar):
        self.set_title()
        self.set_prompt()

    def set_prompt(self):
        if self.tree is not None:
            try:
                prompt = pylon.alias_or_version(self.tree.tree_version, 
                                                self.tree, 
                                                full=False)
                if prompt is not None:
                    prompt = " " + prompt
            except:
                prompt = ""
        else:
            prompt = ""
        self.prompt = "Fai%s> " % prompt

    def set_title(self, command=None):
        try:
            version = pylon.alias_or_version(self.tree.tree_version, self.tree, 
                                             full=False)
        except:
            version = "[no version]"
        if command is None:
            command = ""
        sys.stdout.write(terminal.term_title("Fai %s %s" % (command, version)))

    def do_cd(self, line):
        if line == "":
            line = "~"
        line = os.path.expanduser(line)
        if os.path.isabs(line):
            newcwd = line
        else:
            newcwd = self.cwd+'/'+line
        newcwd = os.path.normpath(newcwd)
        try:
            os.chdir(newcwd)
            self.cwd = newcwd
        except Exception, e:
            print e
        try:
            self.tree = arch.tree_root()
        except:
            self.tree = None

    def do_help(self, line):
        Help()(line)

    def default(self, line):
        args = line.split()
        if find_command(args[0]):
            try:
                find_command(args[0]).do_command(args[1:])
            except cmdutil.BadCommandOption, e:
                print e
            except cmdutil.GetHelp, e:
                find_command(args[0]).help()
            except CommandFailed, e:
                print e
            except arch.errors.ArchiveNotRegistered, e:
                print e
            except KeyboardInterrupt, e:
                print "Interrupted"
            except arch.util.ExecProblem, e:
                print e.proc.error.rstrip('\n')
            except cmdutil.CantDetermineVersion, e:
                print e
            except cmdutil.CantDetermineRevision, e:
                print e
            except Exception, e:
                print "Unhandled error:\n%s" % errors.exception_str(e)

        elif suggestions.has_key(args[0]):
            print suggestions[args[0]]

        elif self.fake_aba.is_command(args[0]):
            tree = None
            try:
                tree = arch.tree_root()
            except arch.errors.TreeRootError:
                pass
            cmd = self.fake_aba.is_command(args[0])
            try:
                cmd.run(cmdutil.expand_prefix_alias(args[1:], tree))
            except KeyboardInterrupt, e:
                print "Interrupted"

        elif options.tla_fallthrough and args[0] != "rm" and \
            cmdutil.is_tla_command(args[0]):
            try:
                tree = None
                try:
                    tree = arch.tree_root()
                except arch.errors.TreeRootError:
                    pass
                args = cmdutil.expand_prefix_alias(args, tree)
                arch.util.exec_safe('tla', args, stderr=sys.stderr,
                expected=(0, 1))
            except arch.util.ExecProblem, e:
                pass
            except KeyboardInterrupt, e:
                print "Interrupted"
        else:
            try:
                try:
                    tree = arch.tree_root()
                except arch.errors.TreeRootError:
                    tree = None
                args=line.split()
                os.system(" ".join(cmdutil.expand_prefix_alias(args, tree)))
            except KeyboardInterrupt, e:
                print "Interrupted"

    def completenames(self, text, line, begidx, endidx):
        completions = []
        iter = iter_command_names(self.fake_aba)
        try:
            if len(line) > 0:
                arg = line.split()[-1]
            else:
                arg = ""
            iter = cmdutil.iter_munged_completions(iter, arg, text)
        except Exception, e:
            print e
        return list(iter)

    def completedefault(self, text, line, begidx, endidx):
        """Perform completion for native commands.
        
        :param text: The text to complete
        :type text: str
        :param line: The entire line to complete
        :type line: str
        :param begidx: The start of the text in the line
        :type begidx: int
        :param endidx: The end of the text in the line
        :type endidx: int
        """
        try:
            (cmd, args, foo) = self.parseline(line)
            command_obj=find_command(cmd)
            if command_obj is not None:
                return command_obj.complete(args.split(), text)
            elif not self.fake_aba.is_command(cmd) and \
                cmdutil.is_tla_command(cmd):
                iter = cmdutil.iter_supported_switches(cmd)
                if len(args) > 0:
                    arg = args.split()[-1]
                else:
                    arg = ""
                if arg.startswith("-"):
                    return list(cmdutil.iter_munged_completions(iter, arg, 
                                                                text))
                else:
                    return list(cmdutil.iter_munged_completions(
                        cmdutil.iter_file_completions(arg), arg, text))


            elif cmd == "cd":
                if len(args) > 0:
                    arg = args.split()[-1]
                else:
                    arg = ""
                iter = cmdutil.iter_dir_completions(arg)
                iter = cmdutil.iter_munged_completions(iter, arg, text)
                return list(iter)
            elif len(args)>0:
                arg = args.split()[-1]
                iter = cmdutil.iter_file_completions(arg)
                return list(cmdutil.iter_munged_completions(iter, arg, text))
            else:
                return self.completenames(text, line, begidx, endidx)
        except Exception, e:
            print e


def iter_command_names(fake_aba):
    for entry in cmdutil.iter_combine([commands.iterkeys(), 
                                     fake_aba.get_commands(), 
                                     cmdutil.iter_tla_commands(False)]):
        if not suggestions.has_key(str(entry)):
            yield entry


def iter_source_file_completions(tree, arg):
    treepath = arch_compound.tree_cwd(tree)
    if len(treepath) > 0:
        dirs = [treepath]
    else:
        dirs = None
    for file in tree.iter_inventory(dirs, source=True, both=True):
        file = file_completion_match(file, treepath, arg)
        if file is not None:
            yield file


def iter_untagged(tree, dirs):
    for file in arch_core.iter_inventory_filter(tree, dirs, tagged=False, 
                                                categories=arch_core.non_root,
                                                control_files=True):
        yield file.name 


def iter_untagged_completions(tree, arg):
    """Generate an iterator for all visible untagged files that match arg.

    :param tree: The tree to look for untagged files in
    :type tree: `arch.WorkingTree`
    :param arg: The argument to match
    :type arg: str
    :return: An iterator of all matching untagged files
    :rtype: iterator of str
    """
    treepath = arch_compound.tree_cwd(tree)
    if len(treepath) > 0:
        dirs = [treepath]
    else:
        dirs = None

    for file in iter_untagged(tree, dirs):
        file = file_completion_match(file, treepath, arg)
        if file is not None:
            yield file


def file_completion_match(file, treepath, arg):
    """Determines whether a file within an arch tree matches the argument.

    :param file: The rooted filename
    :type file: str
    :param treepath: The path to the cwd within the tree
    :type treepath: str
    :param arg: The prefix to match
    :return: The completion name, or None if not a match
    :rtype: str
    """
    if not file.startswith(treepath):
        return None
    if treepath != "":
        file = file[len(treepath)+1:]

    if not file.startswith(arg):
        return None 
    if os.path.isdir(file):
        file += '/'
    return file

def iter_modified_file_completions(tree, arg):
    """Returns a list of modified files that match the specified prefix.

    :param tree: The current tree
    :type tree: `arch.WorkingTree`
    :param arg: The prefix to match
    :type arg: str
    """
    treepath = arch_compound.tree_cwd(tree)
    tmpdir = util.tmpdir()
    changeset = tmpdir+"/changeset"
    completions = []
    revision = cmdutil.determine_revision_tree(tree)
    for line in arch.iter_delta(revision, tree, changeset):
        if isinstance(line, arch.FileModification):
            file = file_completion_match(line.name[1:], treepath, arg)
            if file is not None:
                completions.append(file)
    shutil.rmtree(tmpdir)
    return completions

class Shell(BaseCommand):
    def __init__(self):
        self.description = "Runs Fai as a shell"

    def do_command(self, cmdargs):
        if len(cmdargs)!=0:
            raise cmdutil.GetHelp
        prompt = PromptCmd()
        try:
            prompt.cmdloop()
        finally:
            prompt.write_history()

class AddID(BaseCommand):
    """
    Adds an inventory id for the given file
    """
    def __init__(self):
        self.description="Add an inventory id for a given file"

    def get_completer(self, arg, index):
        tree = arch.tree_root()
        return iter_untagged_completions(tree, arg)

    def do_command(self, cmdargs):
        """
        Master function that perfoms the "revision" command.
        """
        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdargs)

        try:
            tree = arch.tree_root()
        except arch.errors.TreeRootError, e:
            raise pylon.errors.CommandFailedWrapper(e)
            

        if (len(args) == 0) == (options.untagged == False):
            raise cmdutil.GetHelp

       #if options.id and len(args) != 1:
       #    print "If --id is specified, only one file can be named."
       #    return
        
        method = tree.tagging_method
        
        if options.id_type == "tagline":
            if method != "tagline":
                if not cmdutil.prompt("Tagline in other tree"):
                    if method == "explicit" or method == "implicit":
                        options.id_type == method
                    else:
                        print "add-id not supported for \"%s\" tagging method"\
                            % method 
                        return
        
        elif options.id_type == "implicit":
            if method != "implicit":
                if not cmdutil.prompt("Implicit in other tree"):
                    if method == "explicit" or method == "tagline":
                        options.id_type == method
                    else:
                        print "add-id not supported for \"%s\" tagging method"\
                            % method 
                        return
        elif options.id_type == "explicit":
            if method != "tagline" and method != explicit:
                if not prompt("Explicit in other tree"):
                    print "add-id not supported for \"%s\" tagging method" % \
                        method
                    return
        
        if options.id_type == "auto":
            if method != "tagline" and method != "explicit" \
                and method !="implicit":
                print "add-id not supported for \"%s\" tagging method" % method
                return
            else:
                options.id_type = method
        if options.untagged:
            args = None
        self.add_ids(tree, options.id_type, args)

    def add_ids(self, tree, id_type, files=()):
        """Add inventory ids to files.
        
        :param tree: the tree the files are in
        :type tree: `arch.WorkingTree`
        :param id_type: the type of id to add: "explicit" or "tagline"
        :type id_type: str
        :param files: The list of files to add.  If None do all untagged.
        :type files: tuple of str
        """

        untagged = (files is None)
        if untagged:
            files = list(iter_untagged(tree, None))
        previous_files = []
        while len(files) > 0:
            previous_files.extend(files)
            if id_type == "explicit":
                cmdutil.add_id(files)
            elif id_type == "tagline" or id_type == "implicit":
                for file in files:
                    try:
                        implicit = (id_type == "implicit")
                        cmdutil.add_tagline_or_explicit_id(file, False,
                                                           implicit)
                    except cmdutil.AlreadyTagged:
                        print "\"%s\" already has a tagline." % file
                    except cmdutil.NoCommentSyntax:
                        pass
            #do inventory after tagging until no untagged files are encountered
            if untagged:
                files = []
                for file in iter_untagged(tree, None):
                    if not file in previous_files:
                        files.append(file)

            else:
                break

    def get_parser(self):
        """
        Returns the options parser to use for the "revision" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai add-id file1 [file2] [file3]...")
# ddaa suggests removing this to promote GUIDs.  Let's see who squalks.
#        parser.add_option("-i", "--id", dest="id", 
#                         help="Specify id for a single file", default=None)
        parser.add_option("--tltl", action="store_true", 
                         dest="lord_style",  help="Use Tom Lord's style of id.")
        parser.add_option("--explicit", action="store_const", 
                         const="explicit", dest="id_type", 
                         help="Use an explicit id", default="auto")
        parser.add_option("--tagline", action="store_const", 
                         const="tagline", dest="id_type", 
                         help="Use a tagline id")
        parser.add_option("--implicit", action="store_const", 
                         const="implicit", dest="id_type", 
                         help="Use an implicit id (deprecated)")
        parser.add_option("--untagged", action="store_true", 
                         dest="untagged", default=False, 
                         help="tag all untagged files")
        return parser 

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser==None:
            parser=self.get_parser()
        parser.print_help()
        print """
Adds an inventory to the specified file(s) and directories.  If --untagged is
specified, adds inventory to all untagged files and directories.
        """
        return


class Merge(BaseCommand):
    """
    Merges changes from other versions into the current tree
    """
    def __init__(self):
        self.description="Merges changes from other versions"
        try:
            self.tree = arch.tree_root()
        except:
            self.tree = None


    def get_completer(self, arg, index):
        if self.tree is None:
            raise arch.errors.TreeRootError
        return cmdutil.merge_completions(self.tree, arg, index)

    def do_command(self, cmdargs):
        """
        Master function that perfoms the "merge" command.
        """
        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdargs)
        if options.diff3:
            action="star-merge"
        else:
            action = options.action
        
        if self.tree is None:
            raise arch.errors.TreeRootError(os.getcwd())
        if cmdutil.has_changed(ancillary.comp_revision(self.tree)):
            raise UncommittedChanges(self.tree)

        if len(args) > 0:
            revisions = []
            for arg in args:
                revisions.append(cmdutil.determine_revision_arch(self.tree, 
                                                                 arg))
            source = "from commandline"
        else:
            revisions = ancillary.iter_partner_revisions(self.tree, 
                                                         self.tree.tree_version)
            source = "from partner version"
        revisions = misc.rewind_iterator(revisions)
        try:
            revisions.next()
            revisions.rewind()
        except StopIteration, e:
            revision = cmdutil.tag_cur(self.tree)
            if revision is None:
                raise CantDetermineRevision("", "No version specified, no "
                                            "partner-versions, and no tag"
                                            " source")
            revisions = [revision]
            source = "from tag source"
        for revision in revisions:
            cmdutil.ensure_archive_registered(revision.archive)
            cmdutil.colorize(arch.Chatter("* Merging %s [%s]" % 
                             (revision, source)))
            if action=="native-merge" or action=="update":
                if self.native_merge(revision, action) == 0:
                    continue
            elif action=="star-merge":
                try: 
                    self.star_merge(revision, options.diff3)
                except errors.MergeProblem, e:
                    break
            if cmdutil.has_changed(self.tree.tree_version):
                break

    def star_merge(self, revision, diff3):
        """Perform a star-merge on the current tree.
        
        :param revision: The revision to use for the merge
        :type revision: `arch.Revision`
        :param diff3: If true, do a diff3 merge
        :type diff3: bool
        """
        try:
            for line in self.tree.iter_star_merge(revision, diff3=diff3):
                cmdutil.colorize(line)
        except arch.util.ExecProblem, e:
            if e.proc.status is not None and e.proc.status == 1:
                if e.proc.error:
                    print e.proc.error
                raise MergeProblem
            else:
                raise

    def native_merge(self, other_revision, action):
        """Perform a native-merge on the current tree.
        
        :param other_revision: The revision to use for the merge
        :type other_revision: `arch.Revision`
        :return: 0 if the merge was skipped, 1 if it was applied
        """
        other_tree = arch_compound.find_or_make_local_revision(other_revision)
        try:
            if action == "native-merge":
                ancestor = arch_compound.merge_ancestor2(self.tree, other_tree, 
                                                         other_revision)
            elif action == "update":
                ancestor = arch_compound.tree_latest(self.tree, 
                                                     other_revision.version)
        except CantDetermineRevision, e:
            raise CommandFailedWrapper(e)
        cmdutil.colorize(arch.Chatter("* Found common ancestor %s" % ancestor))
        if (ancestor == other_revision):
            cmdutil.colorize(arch.Chatter("* Skipping redundant merge" 
                                          % ancestor))
            return 0
        delta = cmdutil.apply_delta(ancestor, other_tree, self.tree)    
        for line in cmdutil.iter_apply_delta_filter(delta):
            cmdutil.colorize(line)
        return 1



    def get_parser(self):
        """
        Returns the options parser to use for the "merge" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai merge [VERSION]")
        parser.add_option("-s", "--star-merge", action="store_const",
                          dest="action", help="Use star-merge",
                          const="star-merge", default="native-merge")
        parser.add_option("--update", action="store_const",
                          dest="action", help="Use update picker",
                          const="update")
        parser.add_option("--diff3", action="store_true", 
                         dest="diff3",  
                         help="Use diff3 for merge (implies star-merge)")
        return parser 

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser==None:
            parser=self.get_parser()
        parser.print_help()
        print """
Performs a merge operation using the specified version.
        """
        return

class ELog(BaseCommand):
    """
    Produces a raw patchlog and invokes the user's editor
    """
    def __init__(self):
        self.description="Edit a patchlog to commit"
        try:
            self.tree = arch.tree_root()
        except:
            self.tree = None


    def do_command(self, cmdargs):
        """
        Master function that perfoms the "elog" command.
        """
        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdargs)
        if self.tree is None:
            raise arch.errors.TreeRootError

        try:
            edit_log(self.tree, self.tree.tree_version)
        except pylon.errors.NoEditorSpecified, e:
            raise pylon.errors.CommandFailedWrapper(e)

    def get_parser(self):
        """
        Returns the options parser to use for the "merge" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai elog")
        return parser 


    def help(self, parser=None):
        """
        Invokes $EDITOR to produce a log for committing.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser==None:
            parser=self.get_parser()
        parser.print_help()
        print """
Invokes $EDITOR to produce a log for committing.
        """
        return

def edit_log(tree, version):
    """Makes and edits the log for a tree.  Does all kinds of fancy things
    like log templates and merge summaries and log-for-merge
    
    :param tree: The tree to edit the log for
    :type tree: `arch.WorkingTree`
    """
    #ensure we have an editor before preparing the log
    cmdutil.find_editor()
    log = tree.log_message(create=False, version=version)
    log_is_new = False
    if log is None or cmdutil.prompt("Overwrite log"):
        if log is not None:
           os.remove(log.name)
        log = tree.log_message(create=True, version=version)
        log_is_new = True
        tmplog = log.name
        template = pylon.log_template_path(tree)
        if template:
            shutil.copyfile(template, tmplog)
        comp_version = ancillary.comp_revision(tree).version
        new_merges = cmdutil.iter_new_merges(tree, comp_version)
        new_merges = cmdutil.direct_merges(new_merges)
        log["Summary"] = pylon.merge_summary(new_merges, 
                                         version)
        if len(new_merges) > 0:   
            if cmdutil.prompt("Log for merge"):
                if cmdutil.prompt("changelog for merge"):
                    mergestuff = "Patches applied:\n"
                    mergestuff += pylon.changelog_for_merge(new_merges)
                else:
                    mergestuff = cmdutil.log_for_merge(tree, comp_version)
                log.description += mergestuff
        log.save()
    try:
        cmdutil.invoke_editor(log.name)
    except:
        if log_is_new:
            os.remove(log.name)
        raise


class MirrorArchive(BaseCommand):
    """
    Updates a mirror from an archive
    """
    def __init__(self):
        self.description="Update a mirror from an archive"

    def do_command(self, cmdargs):
        """
        Master function that perfoms the "revision" command.
        """

        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdargs)
        if len(args) > 1:
            raise GetHelp
        try:
            tree = arch.tree_root()
        except:
            tree = None

        if len(args) == 0:
            if tree is not None:
                name = tree.tree_version()
        else:
            name = cmdutil.expand_alias(args[0], tree)
            name = arch.NameParser(name)

        to_arch = name.get_archive()
        from_arch = cmdutil.get_mirror_source(arch.Archive(to_arch))
        limit = name.get_nonarch()

        iter = arch_core.mirror_archive(from_arch,to_arch, limit)
        for line in arch.chatter_classifier(iter):
            cmdutil.colorize(line)

    def get_parser(self):
        """
        Returns the options parser to use for the "revision" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai mirror-archive ARCHIVE")
        return parser 

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser==None:
            parser=self.get_parser()
        parser.print_help()
        print """
Updates a mirror from an archive.  If a branch, package, or version is
supplied, only changes under it are mirrored.
        """
        return

def help_tree_spec():
    print """Specifying revisions (default: tree)
Revisions may be specified by alias, revision, version or patchlevel.
Revisions or versions may be fully qualified.  Unqualified revisions, versions, 
or patchlevels use the archive of the current project tree.  Versions will
use the latest patchlevel in the tree.  Patchlevels will use the current tree-
version.

Use "alias" to list available (user and automatic) aliases."""

auto_alias = [
"acur", 
"The latest revision in the archive of the tree-version.  You can specify \
a different version like so: acur:foo--bar--0 (aliases can be used)",
"tcur",
"""(tree current) The latest revision in the tree of the tree-version. \
You can specify a different version like so: tcur:foo--bar--0 (aliases can be \
used).""",
"tprev" , 
"""(tree previous) The previous revision in the tree of the tree-version.  To \
specify an older revision, use a number, e.g. "tprev:4" """,
"tanc" , 
"""(tree ancestor) The ancestor revision of the tree To specify an older \
revision, use a number, e.g. "tanc:4".""",
"tdate" , 
"""(tree date) The latest revision from a given date, e.g. "tdate:July 6".""",
"tmod" , 
""" (tree modified) The latest revision to modify a given file, e.g. \
"tmod:engine.cpp" or "tmod:engine.cpp:16".""",
"ttag" , 
"""(tree tag) The revision that was tagged into the current tree revision, \
according to the tree""",
"tagcur", 
"""(tag current) The latest revision of the version that the current tree \
was tagged from.""",
"mergeanc" , 
"""The common ancestor of the current tree and the specified revision. \
Defaults to the first partner-version's latest revision or to tagcur.""",
]


def is_auto_alias(name):
    """Determine whether a name is an auto alias name

    :param name: the name to check
    :type name: str
    :return: True if the name is an auto alias, false if not
    :rtype: bool
    """
    return name in [f for (f, v) in pylon.util.iter_pairs(auto_alias)]


def display_def(iter, wrap = 80):
    """Display a list of definitions

    :param iter: iter of name, definition pairs
    :type iter: iter of (str, str)
    :param wrap: The width for text wrapping
    :type wrap: int
    """
    vals = list(iter)
    maxlen = 0
    for (key, value) in vals:
        if len(key) > maxlen:
            maxlen = len(key)
    for (key, value) in vals:
        tw=textwrap.TextWrapper(width=wrap, 
                                initial_indent=key.rjust(maxlen)+" : ",
                                subsequent_indent="".rjust(maxlen+3))
        print tw.fill(value)


def help_aliases(tree):
    print """Auto-generated aliases"""
    display_def(pylon.util.iter_pairs(auto_alias))
    print "User aliases"
    display_def(ancillary.iter_all_alias(tree))

class Inventory(BaseCommand):
    """List the status of files in the tree"""
    def __init__(self):
        self.description=self.__doc__

    def do_command(self, cmdargs):
        """
        Master function that perfoms the "revision" command.
        """

        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdargs)
        tree = arch.tree_root()
        categories = []

        if (options.source):
            categories.append(arch_core.SourceFile)
        if (options.precious):
            categories.append(arch_core.PreciousFile)
        if (options.backup):
            categories.append(arch_core.BackupFile)
        if (options.junk):
            categories.append(arch_core.JunkFile)

        if len(categories) == 1:
            show_leading = False
        else:
            show_leading = True

        if len(categories) == 0:
            categories = None

        if options.untagged:
            categories = arch_core.non_root
            show_leading = False
            tagged = False
        else:
            tagged = None
        
        for file in arch_core.iter_inventory_filter(tree, None, 
            control_files=options.control_files, 
            categories = categories, tagged=tagged):
            print arch_core.file_line(file, 
                                      category = show_leading, 
                                      untagged = show_leading,
                                      id = options.ids)

    def get_parser(self):
        """
        Returns the options parser to use for the "revision" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai inventory [options]")
        parser.add_option("--ids", action="store_true", dest="ids", 
                          help="Show file ids")
        parser.add_option("--control", action="store_true", 
                          dest="control_files", help="include control files")
        parser.add_option("--source", action="store_true", dest="source",
                          help="List source files")
        parser.add_option("--backup", action="store_true", dest="backup",
                          help="List backup files")
        parser.add_option("--precious", action="store_true", dest="precious",
                          help="List precious files")
        parser.add_option("--junk", action="store_true", dest="junk",
                          help="List junk files")
        parser.add_option("--unrecognized", action="store_true", 
                          dest="unrecognized", help="List unrecognized files")
        parser.add_option("--untagged", action="store_true", 
                          dest="untagged", help="List only untagged files")
        return parser 

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser==None:
            parser=self.get_parser()
        parser.print_help()
        print """
Lists the status of files in the archive:
S source
P precious
B backup
J junk
U unrecognized
T tree root
? untagged-source
Leading letter are not displayed if only one kind of file is shown
        """
        return


class Alias(BaseCommand):
    """List or adjust aliases"""
    def __init__(self):
        self.description=self.__doc__

    def get_completer(self, arg, index):
        if index > 2:
            return ()
        try:
            self.tree = arch.tree_root()
        except:
            self.tree = None

        if index == 0:
            return [part[0]+" " for part in ancillary.iter_all_alias(self.tree)]
        elif index == 1:
            return cmdutil.iter_revision_completions(arg, self.tree)


    def do_command(self, cmdargs):
        """
        Master function that perfoms the "revision" command.
        """

        parser=self.get_parser()
        (options, args) = parser.parse_args(cmdargs)
        try:
            self.tree =  arch.tree_root()
        except:
            self.tree = None


        try:
            options.action(args, options)
        except cmdutil.ForbiddenAliasSyntax, e:
            raise CommandFailedWrapper(e)

    def no_prefix(self, alias):
        if alias.startswith("^"):
            alias = alias[1:]
        return alias
        
    def arg_dispatch(self, args, options):
        """Add, modify, or list aliases, depending on number of arguments

        :param args: The list of commandline arguments
        :type args: list of str
        :param options: The commandline options
        """
        if len(args) == 0:
            help_aliases(self.tree)
            return
        else:
            alias = self.no_prefix(args[0])
            if len(args) == 1:
                self.print_alias(alias)
            elif (len(args)) == 2:
                self.add(alias, args[1], options)
            else:
                raise cmdutil.GetHelp

    def print_alias(self, alias):
        answer = None
        if is_auto_alias(alias):
            raise pylon.errors.IsAutoAlias(alias, "\"%s\" is an auto alias."
                "  Use \"revision\" to expand auto aliases." % alias)
        for pair in ancillary.iter_all_alias(self.tree):
            if pair[0] == alias:
                answer = pair[1]
        if answer is not None:
            print answer
        else:
            print "The alias %s is not assigned." % alias

    def add(self, alias, expansion, options):
        """Add or modify aliases

        :param alias: The alias name to create/modify
        :type alias: str
        :param expansion: The expansion to assign to the alias name
        :type expansion: str
        :param options: The commandline options
        """
        if is_auto_alias(alias):
            raise IsAutoAlias(alias)
        newlist = ""
        written = False
        new_line = "%s=%s\n" % (alias, cmdutil.expand_alias(expansion, 
            self.tree))
        ancillary.check_alias(new_line.rstrip("\n"), [alias, expansion])

        for pair in self.get_iterator(options):
            if pair[0] != alias:
                newlist+="%s=%s\n" % (pair[0], pair[1])
            elif not written:
                newlist+=new_line
                written = True
        if not written:
            newlist+=new_line
        self.write_aliases(newlist, options)
            
    def delete(self, args, options):
        """Delete the specified alias

        :param args: The list of arguments
        :type args: list of str
        :param options: The commandline options
        """
        deleted = False
        if len(args) != 1:
            raise cmdutil.GetHelp
        alias = self.no_prefix(args[0])
        if is_auto_alias(alias):
            raise IsAutoAlias(alias)
        newlist = ""
        for pair in self.get_iterator(options):
            if pair[0] != alias:
                newlist+="%s=%s\n" % (pair[0], pair[1])
            else:
                deleted = True
        if not deleted:
            raise errors.NoSuchAlias(alias)
        self.write_aliases(newlist, options)

    def get_alias_file(self, options):
        """Return the name of the alias file to use

        :param options: The commandline options
        """
        if options.tree:
            if self.tree is None:
                self.tree == arch.tree_root()
            return str(self.tree)+"/{arch}/+aliases"
        else:
            return "~/.aba/aliases"

    def get_iterator(self, options):
        """Return the alias iterator to use

        :param options: The commandline options
        """
        return ancillary.iter_alias(self.get_alias_file(options))

    def write_aliases(self, newlist, options):
        """Safely rewrite the alias file
        :param newlist: The new list of aliases
        :type newlist: str
        :param options: The commandline options
        """
        filename = os.path.expanduser(self.get_alias_file(options))
        file = util.NewFileVersion(filename)
        file.write(newlist)
        file.commit()


    def get_parser(self):
        """
        Returns the options parser to use for the "alias" command.

        :rtype: cmdutil.CmdOptionParser
        """
        parser=cmdutil.CmdOptionParser("fai alias [ALIAS] [NAME]")
        parser.add_option("-d", "--delete", action="store_const", dest="action",
                          const=self.delete, default=self.arg_dispatch, 
                          help="Delete an alias")
        parser.add_option("--tree", action="store_true", dest="tree", 
                          help="Create a per-tree alias", default=False)
        return parser 

    def help(self, parser=None):
        """
        Prints a help message.

        :param parser: If supplied, the parser to use for generating help.  If \
        not supplied, it is retrieved.
        :type parser: cmdutil.CmdOptionParser
        """
        if parser==None:
            parser=self.get_parser()
        parser.print_help()
        print """
Lists current aliases or modifies the list of aliases.

If no arguments are supplied, aliases will be listed.  If two arguments are
supplied, the specified alias will be created or modified.  If -d or --delete
is supplied, the specified alias will be deleted.

You can create aliases that refer to any fully-qualified part of the
Arch namespace, e.g. 
archive, 
archive/category, 
archive/category--branch, 
archive/category--branch--version (my favourite)
archive/category--branch--version--patchlevel

Aliases can be used automatically by native commands.  To use them
with external or tla commands, prefix them with ^ (you can do this
with native commands, too).
"""


class RequestMerge(BaseCommand):
    """Submit a merge request to Bug Goo"""
    def __init__(self):
        self.description=self.__doc__

    def do_command(self, cmdargs):
        """Submit a merge request

        :param cmdargs: The commandline arguments
        :type cmdargs: list of str
        """
        parser = self.get_parser()
        (options, args) = parser.parse_args(cmdargs)
        try:
            cmdutil.find_editor()
        except pylon.errors.NoEditorSpecified, e:
            raise pylon.errors.CommandFailedWrapper(e)
        try:
            self.tree=arch.tree_root()
        except:
            self.tree=None
        base, revisions = self.revision_specs(args)
        message = self.make_headers(base, revisions)
        message += self.make_summary(revisions)
        path = self.edit_message(message)
        message = self.tidy_message(path)
        if cmdutil.prompt("Send merge"):
            self.send_message(message)
            print "Merge request sent"

    def make_headers(self, base, revisions):
        """Produce email and Bug Goo header strings

        :param base: The base revision to apply merges to
        :type base: `arch.Revision`
        :param revisions: The revisions to replay into the base
        :type revisions: list of `arch.Patchlog`
        :return: The headers
        :rtype: str
        """
        headers = "To: gnu-arch-users@gnu.org\n"
        headers += "From: %s\n" % options.fromaddr
        if len(revisions) == 1:
            headers += "Subject: [MERGE REQUEST] %s\n" % revisions[0].summary
        else:
            headers += "Subject: [MERGE REQUEST]\n"
        headers += "\n"
        headers += "Base-Revision: %s\n" % base
        for revision in revisions:
            headers += "Revision: %s\n" % revision.revision
        headers += "Bug: \n\n"
        return headers

    def make_summary(self, logs):
        """Generate a summary of merges

        :param logs: the patchlogs that were directly added by the merges
        :type logs: list of `arch.Patchlog`
        :return: the summary
        :rtype: str
        """ 
        summary = ""
        for log in logs:
            summary+=str(log.revision)+"\n"
            summary+=log.summary+"\n"
            if log.description.strip():
                summary+=log.description.strip('\n')+"\n\n"
        return summary

    def revision_specs(self, args):
        """Determine the base and merge revisions from tree and arguments.

        :param args: The parsed arguments
        :type args: list of str
        :return: The base revision and merge revisions 
        :rtype: `arch.Revision`, list of `arch.Patchlog`
        """
        if len(args) > 0:
            target_revision = cmdutil.determine_revision_arch(self.tree, 
                                                              args[0])
        else:
            target_revision = arch_compound.tree_latest(self.tree)
        if len(args) > 1:
            merges = [ arch.Patchlog(cmdutil.determine_revision_arch(
                       self.tree, f)) for f in args[1:] ]
        else:
            if self.tree is None:
                raise CantDetermineRevision("", "Not in a project tree")
            merge_iter = cmdutil.iter_new_merges(self.tree, 
                                                 target_revision.version, 
                                                 False)
            merges = [f for f in cmdutil.direct_merges(merge_iter)]
        return (target_revision, merges)

    def edit_message(self, message):
        """Edit an email message in the user's standard editor

        :param message: The message to edit
        :type message: str
        :return: the path of the edited message
        :rtype: str
        """
        if self.tree is None:
            path = os.get_cwd()
        else:
            path = self.tree
        path += "/,merge-request"
        file = open(path, 'w')
        file.write(message)
        file.flush()
        cmdutil.invoke_editor(path)
        return path

    def tidy_message(self, path):
        """Validate and clean up message.

        :param path: The path to the message to clean up
        :type path: str
        :return: The parsed message
        :rtype: `email.Message`
        """
        mail = email.message_from_file(open(path))
        if mail["Subject"].strip() == "[MERGE REQUEST]":
            raise BlandSubject
        
        request = email.message_from_string(mail.get_payload())
        if request.has_key("Bug"):
            if request["Bug"].strip()=="":
                del request["Bug"]
        mail.set_payload(request.as_string())
        return mail

    def send_message(self, message):
        """Send a message, using its headers to address it.

        :param message: The message to send
        :type message: `email.Message`"""
        server = smtplib.SMTP("localhost")
        server.sendmail(message['From'], message['To'], message.as_string())
        server.quit()

    def help(self, parser=None):
        """Print a usage message

        :param parser: The options parser to use
        :type parser: `cmdutil.CmdOptionParser`
        """
        if parser is None:
            parser = self.get_parser()
        parser.print_help()
        print """
Sends a merge request formatted for Bug Goo.  Intended use: get the tree
you'd like to merge into.  Apply the merges you want.  Invoke request-merge.
The merge request will open in your $EDITOR.

When no TARGET is specified, it uses the current tree revision.  When
no MERGE is specified, it uses the direct merges (as in "revisions
--direct-merges").  But you can specify just the TARGET, or all the MERGE
revisions.
"""

    def get_parser(self):
        """Produce a commandline parser for this command.

        :rtype: `cmdutil.CmdOptionParser`
        """
        parser=cmdutil.CmdOptionParser("request-merge [TARGET] [MERGE1...]")
        return parser

commands = { 
'changes' : Changes,
'help' : Help,
'update': Update,
'apply-changes':ApplyChanges,
'cat-log': CatLog,
'commit': Commit,
'revision': Revision,
'revisions': Revisions,
'get': Get,
'revert': Revert,
'shell': Shell,
'add-id': AddID,
'merge': Merge,
'elog': ELog,
'mirror-archive': MirrorArchive,
'ninventory': Inventory,
'alias' : Alias,
'request-merge': RequestMerge,
}

def my_import(mod_name):
    module = __import__(mod_name)
    components = mod_name.split('.')
    for comp in components[1:]:
        module = getattr(module, comp)
    return module

def plugin(mod_name):
    module = my_import(mod_name)
    module.add_command(commands)

for file in os.listdir(sys.path[0]+"/command"):
    if len(file) > 3 and file[-3:] == ".py" and file != "__init__.py":
        plugin("command."+file[:-3])

suggestions = {
'apply-delta' : "Try \"apply-changes\".",
'delta' : "To compare two revisions, use \"changes\".",
'diff-rev' : "To compare two revisions, use \"changes\".",
'undo' : "To undo local changes, use \"revert\".",
'undelete' : "To undo only deletions, use \"revert --deletions\"",
'missing-from' : "Try \"revisions --missing-from\".",
'missing' : "Try \"revisions --missing\".",
'missing-merge' : "Try \"revisions --partner-missing\".",
'new-merges' : "Try \"revisions --new-merges\".",
'cachedrevs' : "Try \"revisions --cacherevs\". (no 'd')",
'logs' : "Try \"revisions --logs\"",
'tree-source' : "Use the \"^ttag\" alias (\"revision ^ttag\")",
'latest-revision' : "Use the \"^acur\" alias (\"revision ^acur\")",
'change-version' : "Try \"update REVISION\"",
'tree-revision' : "Use the \"^tcur\" alias (\"revision ^tcur\")",
'rev-depends' : "Use revisions --dependencies",
'auto-get' : "Plain get will do archive lookups",
'tagline' : "Use add-id.  It uses taglines in tagline trees",
'emlog' : "Use elog.  It automatically adds log-for-merge text, if any",
'library-revisions' : "Use revisions --library",
'file-revert' : "Use revert FILE",
'join-branch' : "Use replay --logs-only"
}
# arch-tag: 19d5739d-3708-486c-93ba-deecc3027fc7