view hgext/githelp.py @ 39506:b66ea3fc3a86

sparse-revlog: set max delta chain length to on thousand The new snapshot system used in the sparse-revlog case gave us some small size benefit so far. However its most important property is to gracefully handle harder limit on delta chainlength. Long delta chain has a very detrimental impact on read (and write) performance in revlog. Being able to shorter them provide a great boost. However, shorting delta used to result significantly lower compression ratio. The intermediate snapshots effectively suppress most of this effect (even all in some case). # Effect on the test repository The repository we use for test is not "realistic" but can still show this in action using an unreasonably low chain limit. Limiting the chain length show a sizeable increase but stay under control: +6% for limit=15; +15% for limit=10. Without the snapshot system the increase is significantly bigger: +45% for limit=15; +80% for limit=10. Even slightly larger than without delta chain limit, the resulting size is still smaller than before we started doing snapshots. Here is a table for comparison. *Since the repository is not branchy, the initial sparse-revlog version does not bring much benefit compare to the non-sparse one): chain length limit | none | limit=15 | limit=10 | without sparse-revlog | 62 818 987 | 112 664 615 | 131 222 574 | without snapshot | 74 365 490 | 108 211 410 | 133 857 764 | with snapshot | 59 230 936 | 63 002 924 | 68 415 329 | # Effect On Real Life Repositories The series provides significant benefits on all kind of repositories. Using `hg debugupgraderepo -o redeltaparent --run`, we recomputed delta chain for various repositories with different settings: - delta chain length: unlimited or 1000 limit - sparse-revlog: enabled or disabled - this series: applied or not applied We can observe multiple types of effect: - On very branchy repositories: * The delta chain limit as low impact on the repo size. * Intermediate snapshot greatly reduces manifest size: - pypy: -80% - netbeans: -95% * The delta chain limit is effective, without a size impact: - netbeans average: 613 -> 282 - private #1 average: 1 068 -> 307 - On more linear repository: * Intermediate snapshot limit the impact of delta chain limit: - mozilla: without the series: +360% with the series: +25% * The delta chain limit provides large improvement: - mozilla's average chain length: unlimited: 15 338 limited: 469 * Despite the chain length limit, the manifest size is reduced: - mercurial: -25% - mozilla: -30% It is clear that the use of chains of intermediate snapshots provide large benefits both in storage size and delta chains quality. We should now switch our effort toward making sure the write performance are acceptable. Then, `sparse-revlog` will be a suitable format for all new repository. # Raw Statistic * no-sparse: general delta repository not using sparse-revlog * no-snapshot: sparse-revlog repository not using this series * snapshot: sparse-revlog repository using this series mercurial Manifest Size: limit | none | 1000 ------------|-------------|------------ no-sparse | 8 021 373 | 8 199 366 no-snapshot | 8 103 561 | 8 259 719 snapshot | 6 137 116 | 6 126 433 Manifest Chain length data limit || none || 1000 || value || average | max || average | max || ------------||---------|---------||---------|---------|| no-sparse || 307 | 1456 || 279 | 1000 || no-snapshot || 312 | 1456 || 283 | 1000 || snapshot || 248 | 1208 || 241 | 1000 || Full Store Size limit | none | 1000 ------------|-------------|------------ no-sparse | 51 013 198 | 51 201 574 no-snapshot | 50 930 795 | 51 141 006 snapshot | 48 072 037 | 48 093 572 pypy Manifest Size: limit | none | 1000 ------------|-------------|------------ no-sparse | 193 987 784 | 193 987 784 no-snapshot | 163 171 745 | 163 312 229 snapshot | 34 605 900 | 34 600 750 Manifest Chain length data limit || none || 1000 || value || average | max || average | max || ------------||---------|---------||---------|---------|| no-sparse || 101 | 692 || 101 | 692 || no-snapshot || 151 | 1307 || 148 | 1000 || snapshot || 128 | 1309 || 125 | 1000 || Full Store Size limit | none | 1000 ------------|-------------|------------ no-sparse | 495 931 473 | 495 931 473 no-snapshot | 465 441 017 | 465 581 501 snapshot | 355 467 301 | 355 472 451 Mozilla Manifest Size: limit | none | 1000 ------------|----------------|--------------- no-sparse | 416 757 148 | 1 869 009 668 no-snapshot | 401 592 370 | 1 843 493 795 snapshot | 224 359 521 | 284 615 500 Manifest Chain length data limit || none || 1000 || value || average | max || average | max || ------------||---------|---------||---------|---------|| no-sparse || 15 333 | 58 980 || 468 | 1 000 || no-snapshot || 15 336 | 58 980 || 469 | 1 000 || snapshot || 15 338 | 58 983 || 469 | 1 000 || Full Store Size limit | none | 1000 ------------|----------------|--------------- no-sparse | 2 712 477 887 | 4 164 995 451 no-snapshot | 2 698 887 835 | 4 141 054 304 snapshot | 2 518 130 385 | 2 578 587 596 Netbeans Manifest Size: limit | none | 1000 ------------|----------------|--------------- no-sparse | 4 766 794 101 | 4 870 642 687 no-snapshot | 4 334 806 082 | 4 428 681 309 snapshot | 232 659 666 | 240 330 665 Manifest Chain length data limit || none || 1000 || value || average | max || average | max || ------------||---------|---------||---------|---------|| no-sparse || 597 | 6802 || 254 | 1 000 || no-snapshot || 648 | 6 802 || 305 | 1 000 || snapshot || 613 | 6 804 || 282 | 1 000 || Full Store Size limit | none | 1000 ------------|----------------|--------------- no-sparse | 5 807 347 998 | 5 911 196 584 no-snapshot | 5 375 398 602 | 5 469 273 829 snapshot | 1 282 519 928 | 1 290 190 927 Private repo #1 Manifest Size: limit | none | 1000 ------------|-----------------|--------------- no-sparse | 41 389 010 840 | 41 398 162 091 no-snapshot | 9 737 319 435 | 10 223 773 150 snapshot | 744 215 807 | 747 961 822 Manifest Chain length data limit || none || 1000 || value || average | max || average | max || ------------||---------|---------||---------|---------|| no-sparse || 245 | 8 885 || 81 | 1 000 || no-snapshot || 1 225 | 8 885 || 336 | 1 000 || snapshot || 1 068 | 7 909 || 307 | 1 000 || Full Store Size limit | none | 1000 ------------|----------------|--------------- no-sparse | 49 646 065 126 | 49 655 216 377 no-snapshot | 17 924 862 856 | 18 411 316 571 snapshot | 9 009 024 710 | 9 012 770 725 Private repo #2 We currently have less data available for that repository. * Before is a sparse-revlog repository without this series * After is a sparse-revlog repository with this series + 1000 chain limit Manifest Size: Before: 1 531 485 040 bytes After: 1 091 422 451 bytes Manifest Chain: Before: 2 218 avg; 6 575 Max After: 442 avg; 1 000 Max Full Store Size Before: 15 203 955 615 after: 8 207 180 693
author Boris Feld <boris.feld@octobus.net>
date Fri, 07 Sep 2018 11:18:45 -0400
parents c3960c7e66fa
children c303d65d2e34
line wrap: on
line source

# githelp.py - Try to map Git commands to Mercurial equivalents.
#
# Copyright 2013 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""try mapping git commands to Mercurial commands

Tries to map a given git command to a Mercurial command:

  $ hg githelp -- git checkout master
  hg update master

If an unknown command or parameter combination is detected, an error is
produced.
"""

from __future__ import absolute_import

import getopt
import re

from mercurial.i18n import _
from mercurial import (
    encoding,
    error,
    fancyopts,
    registrar,
    scmutil,
)
from mercurial.utils import (
    procutil,
)

# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'ships-with-hg-core'

cmdtable = {}
command = registrar.command(cmdtable)

def convert(s):
    if s.startswith("origin/"):
        return s[7:]
    if 'HEAD' in s:
        s = s.replace('HEAD', '.')
    # HEAD~ in git is .~1 in mercurial
    s = re.sub('~$', '~1', s)
    return s

@command('^githelp|git', [
    ], _('hg githelp'))
def githelp(ui, repo, *args, **kwargs):
    '''suggests the Mercurial equivalent of the given git command

    Usage: hg githelp -- <git command>
    '''

    if len(args) == 0 or (len(args) == 1 and args[0] =='git'):
        raise error.Abort(_('missing git command - '
                            'usage: hg githelp -- <git command>'))

    if args[0] == 'git':
        args = args[1:]

    cmd = args[0]
    if not cmd in gitcommands:
        raise error.Abort(_("error: unknown git command %s") % (cmd))

    ui.pager('githelp')
    args = args[1:]
    return gitcommands[cmd](ui, repo, *args, **kwargs)

def parseoptions(ui, cmdoptions, args):
    cmdoptions = list(cmdoptions)
    opts = {}
    args = list(args)
    while True:
        try:
            args = fancyopts.fancyopts(list(args), cmdoptions, opts, True)
            break
        except getopt.GetoptError as ex:
            flag = None
            if "requires argument" in ex.msg:
                raise
            if ('--' + ex.opt) in ex.msg:
                flag = '--' + ex.opt
            elif ('-' + ex.opt) in ex.msg:
                flag = '-' + ex.opt
            else:
                raise error.Abort(_("unknown option %s") % ex.opt)
            try:
                args.remove(flag)
            except Exception:
                msg = _("unknown option '%s' packed with other options")
                hint = _("please try passing the option as its own flag: -%s")
                raise error.Abort(msg % ex.opt, hint=hint % ex.opt)

            ui.warn(_("ignoring unknown option %s\n") % flag)

    args = list([convert(x) for x in args])
    opts = dict([(k, convert(v)) if isinstance(v, str) else (k, v)
                                 for k, v in opts.iteritems()])

    return args, opts

class Command(object):
    def __init__(self, name):
        self.name = name
        self.args = []
        self.opts = {}

    def __bytes__(self):
        cmd = "hg " + self.name
        if self.opts:
            for k, values in sorted(self.opts.iteritems()):
                for v in values:
                    if v:
                        cmd += " %s %s" % (k, v)
                    else:
                        cmd += " %s" % (k,)
        if self.args:
            cmd += " "
            cmd += " ".join(self.args)
        return cmd

    __str__ = encoding.strmethod(__bytes__)

    def append(self, value):
        self.args.append(value)

    def extend(self, values):
        self.args.extend(values)

    def __setitem__(self, key, value):
        values = self.opts.setdefault(key, [])
        values.append(value)

    def __and__(self, other):
        return AndCommand(self, other)

class AndCommand(object):
    def __init__(self, left, right):
        self.left = left
        self.right = right

    def __str__(self):
        return "%s && %s" % (self.left, self.right)

    def __and__(self, other):
        return AndCommand(self, other)

def add(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('A', 'all', None, ''),
        ('p', 'patch', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    if (opts.get('patch')):
        ui.status(_("note: Mercurial will commit when complete, "
                    "as there is no staging area in Mercurial\n\n"))
        cmd = Command('commit --interactive')
    else:
        cmd = Command("add")

        if not opts.get('all'):
            cmd.extend(args)
        else:
            ui.status(_("note: use hg addremove to remove files that have "
                        "been deleted\n\n"))

    ui.status((bytes(cmd)), "\n")

def am(ui, repo, *args, **kwargs):
    cmdoptions=[
    ]
    args, opts = parseoptions(ui, cmdoptions, args)
    cmd = Command('import')
    ui.status(bytes(cmd), "\n")

def apply(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('p', 'p', int, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('import --no-commit')
    if (opts.get('p')):
        cmd['-p'] = opts.get('p')
    cmd.extend(args)

    ui.status((bytes(cmd)), "\n")

def bisect(ui, repo, *args, **kwargs):
    ui.status(_("see 'hg help bisect' for how to use bisect\n\n"))

def blame(ui, repo, *args, **kwargs):
    cmdoptions = [
    ]
    args, opts = parseoptions(ui, cmdoptions, args)
    cmd = Command('annotate -udl')
    cmd.extend([convert(v) for v in args])
    ui.status((bytes(cmd)), "\n")

def branch(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'set-upstream', None, ''),
        ('', 'set-upstream-to', '', ''),
        ('d', 'delete', None, ''),
        ('D', 'delete', None, ''),
        ('m', 'move', None, ''),
        ('M', 'move', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command("bookmark")

    if opts.get('set_upstream') or opts.get('set_upstream_to'):
        ui.status(_("Mercurial has no concept of upstream branches\n"))
        return
    elif opts.get('delete'):
        cmd = Command("strip")
        for branch in args:
            cmd['-B'] = branch
        else:
            cmd['-B'] = None
    elif opts.get('move'):
        if len(args) > 0:
            if len(args) > 1:
                old = args.pop(0)
            else:
                # shell command to output the active bookmark for the active
                # revision
                old = '`hg log -T"{activebookmark}" -r .`'
        else:
            raise error.Abort(_('missing newbranch argument'))
        new = args[0]
        cmd['-m'] = old
        cmd.append(new)
    else:
        if len(args) > 1:
            cmd['-r'] = args[1]
            cmd.append(args[0])
        elif len(args) == 1:
            cmd.append(args[0])
    ui.status((bytes(cmd)), "\n")

def ispath(repo, string):
    """
    The first argument to git checkout can either be a revision or a path. Let's
    generally assume it's a revision, unless it's obviously a path. There are
    too many ways to spell revisions in git for us to reasonably catch all of
    them, so let's be conservative.
    """
    if scmutil.isrevsymbol(repo, string):
        # if it's definitely a revision let's not even check if a file of the
        # same name exists.
        return False

    cwd = repo.getcwd()
    if cwd == '':
        repopath = string
    else:
        repopath = cwd + '/' + string

    exists = repo.wvfs.exists(repopath)
    if exists:
        return True

    manifest = repo['.'].manifest()

    didexist = (repopath in manifest) or manifest.hasdir(repopath)

    return didexist

def checkout(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('b', 'branch', '', ''),
        ('B', 'branch', '', ''),
        ('f', 'force', None, ''),
        ('p', 'patch', None, ''),
    ]
    paths = []
    if '--' in args:
        sepindex = args.index('--')
        paths.extend(args[sepindex + 1:])
        args = args[:sepindex]

    args, opts = parseoptions(ui, cmdoptions, args)

    rev = None
    if args and ispath(repo, args[0]):
        paths = args + paths
    elif args:
        rev = args[0]
        paths = args[1:] + paths

    cmd = Command('update')

    if opts.get('force'):
        if paths or rev:
            cmd['-C'] = None

    if opts.get('patch'):
        cmd = Command('revert')
        cmd['-i'] = None

    if opts.get('branch'):
        if len(args) == 0:
            cmd = Command('bookmark')
            cmd.append(opts.get('branch'))
        else:
            cmd.append(args[0])
            bookcmd = Command('bookmark')
            bookcmd.append(opts.get('branch'))
            cmd = cmd & bookcmd
    # if there is any path argument supplied, use revert instead of update
    elif len(paths) > 0:
        ui.status(_("note: use --no-backup to avoid creating .orig files\n\n"))
        cmd = Command('revert')
        if opts.get('patch'):
            cmd['-i'] = None
        if rev:
            cmd['-r'] = rev
        cmd.extend(paths)
    elif rev:
        if opts.get('patch'):
            cmd['-r'] = rev
        else:
            cmd.append(rev)
    elif opts.get('force'):
        cmd = Command('revert')
        cmd['--all'] = None
    else:
        raise error.Abort(_("a commit must be specified"))

    ui.status((bytes(cmd)), "\n")

def cherrypick(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'continue', None, ''),
        ('', 'abort', None, ''),
        ('e', 'edit', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('graft')

    if opts.get('edit'):
        cmd['--edit'] = None
    if opts.get('continue'):
        cmd['--continue'] = None
    elif opts.get('abort'):
        ui.status(_("note: hg graft does not have --abort\n\n"))
        return
    else:
        cmd.extend(args)

    ui.status((bytes(cmd)), "\n")

def clean(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('d', 'd', None, ''),
        ('f', 'force', None, ''),
        ('x', 'x', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('purge')
    if opts.get('x'):
        cmd['--all'] = None
    cmd.extend(args)

    ui.status((bytes(cmd)), "\n")

def clone(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'bare', None, ''),
        ('n', 'no-checkout', None, ''),
        ('b', 'branch', '', ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    if len(args) == 0:
        raise error.Abort(_("a repository to clone must be specified"))

    cmd = Command('clone')
    cmd.append(args[0])
    if len(args) > 1:
        cmd.append(args[1])

    if opts.get('bare'):
        cmd['-U'] = None
        ui.status(_("note: Mercurial does not have bare clones. "
                    "-U will clone the repo without checking out a commit\n\n"))
    elif opts.get('no_checkout'):
        cmd['-U'] = None

    if opts.get('branch'):
        cocmd = Command("update")
        cocmd.append(opts.get('branch'))
        cmd = cmd & cocmd

    ui.status((bytes(cmd)), "\n")

def commit(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('a', 'all', None, ''),
        ('m', 'message', '', ''),
        ('p', 'patch', None, ''),
        ('C', 'reuse-message', '', ''),
        ('F', 'file', '', ''),
        ('', 'author', '', ''),
        ('', 'date', '', ''),
        ('', 'amend', None, ''),
        ('', 'no-edit', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('commit')
    if opts.get('patch'):
        cmd = Command('commit --interactive')

    if opts.get('amend'):
        if opts.get('no_edit'):
            cmd = Command('amend')
        else:
            cmd['--amend'] = None

    if opts.get('reuse_message'):
        cmd['-M'] = opts.get('reuse_message')

    if opts.get('message'):
        cmd['-m'] = "'%s'" % (opts.get('message'),)

    if opts.get('all'):
        ui.status(_("note: Mercurial doesn't have a staging area, "
                    "so there is no --all. -A will add and remove files "
                    "for you though.\n\n"))

    if opts.get('file'):
        cmd['-l'] = opts.get('file')

    if opts.get('author'):
        cmd['-u'] = opts.get('author')

    if opts.get('date'):
        cmd['-d'] = opts.get('date')

    cmd.extend(args)

    ui.status((bytes(cmd)), "\n")

def deprecated(ui, repo, *args, **kwargs):
    ui.warn(_('this command has been deprecated in the git project, '
              'thus isn\'t supported by this tool\n\n'))

def diff(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('a', 'all', None, ''),
        ('', 'cached', None, ''),
        ('R', 'reverse', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('diff')

    if opts.get('cached'):
        ui.status(_('note: Mercurial has no concept of a staging area, '
                    'so --cached does nothing\n\n'))

    if opts.get('reverse'):
        cmd['--reverse'] = None

    for a in list(args):
        args.remove(a)
        try:
            repo.revs(a)
            cmd['-r'] = a
        except Exception:
            cmd.append(a)

    ui.status((bytes(cmd)), "\n")

def difftool(ui, repo, *args, **kwargs):
    ui.status(_('Mercurial does not enable external difftool by default. You '
        'need to enable the extdiff extension in your .hgrc file by adding\n'
        'extdiff =\n'
        'to the [extensions] section and then running\n\n'
        'hg extdiff -p <program>\n\n'
        'See \'hg help extdiff\' and \'hg help -e extdiff\' for more '
        'information.\n'))

def fetch(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'all', None, ''),
        ('f', 'force', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('pull')

    if len(args) > 0:
        cmd.append(args[0])
        if len(args) > 1:
            ui.status(_("note: Mercurial doesn't have refspecs. "
                        "-r can be used to specify which commits you want to "
                        "pull. -B can be used to specify which bookmark you "
                        "want to pull.\n\n"))
            for v in args[1:]:
                if v in repo._bookmarks:
                    cmd['-B'] = v
                else:
                    cmd['-r'] = v

    ui.status((bytes(cmd)), "\n")

def grep(ui, repo, *args, **kwargs):
    cmdoptions = [
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('grep')

    # For basic usage, git grep and hg grep are the same. They both have the
    # pattern first, followed by paths.
    cmd.extend(args)

    ui.status((bytes(cmd)), "\n")

def init(ui, repo, *args, **kwargs):
    cmdoptions = [
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('init')

    if len(args) > 0:
        cmd.append(args[0])

    ui.status((bytes(cmd)), "\n")

def log(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'follow', None, ''),
        ('', 'decorate', None, ''),
        ('n', 'number', '', ''),
        ('1', '1', None, ''),
        ('', 'pretty', '', ''),
        ('', 'format', '', ''),
        ('', 'oneline', None, ''),
        ('', 'stat', None, ''),
        ('', 'graph', None, ''),
        ('p', 'patch', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)
    ui.status(_('note: -v prints the entire commit message like Git does. To '
                'print just the first line, drop the -v.\n\n'))
    ui.status(_("note: see hg help revset for information on how to filter "
                "log output\n\n"))

    cmd = Command('log')
    cmd['-v'] = None

    if opts.get('number'):
        cmd['-l'] = opts.get('number')
    if opts.get('1'):
        cmd['-l'] = '1'
    if opts.get('stat'):
        cmd['--stat'] = None
    if opts.get('graph'):
        cmd['-G'] = None
    if opts.get('patch'):
        cmd['-p'] = None

    if opts.get('pretty') or opts.get('format') or opts.get('oneline'):
        format = opts.get('format', '')
        if 'format:' in format:
            ui.status(_("note: --format format:??? equates to Mercurial's "
                        "--template. See hg help templates for more info.\n\n"))
            cmd['--template'] = '???'
        else:
            ui.status(_("note: --pretty/format/oneline equate to Mercurial's "
                        "--style or --template. See hg help templates for "
                        "more info.\n\n"))
            cmd['--style'] = '???'

    if len(args) > 0:
        if '..' in args[0]:
            since, until = args[0].split('..')
            cmd['-r'] = "'%s::%s'" % (since, until)
            del args[0]
        cmd.extend(args)

    ui.status((bytes(cmd)), "\n")

def lsfiles(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('c', 'cached', None, ''),
        ('d', 'deleted', None, ''),
        ('m', 'modified', None, ''),
        ('o', 'others', None, ''),
        ('i', 'ignored', None, ''),
        ('s', 'stage', None, ''),
        ('z', '_zero', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    if (opts.get('modified') or opts.get('deleted')
        or opts.get('others') or opts.get('ignored')):
        cmd = Command('status')
        if opts.get('deleted'):
            cmd['-d'] = None
        if opts.get('modified'):
            cmd['-m'] = None
        if opts.get('others'):
            cmd['-o'] = None
        if opts.get('ignored'):
            cmd['-i'] = None
    else:
        cmd = Command('files')
    if opts.get('stage'):
        ui.status(_("note: Mercurial doesn't have a staging area, ignoring "
                  "--stage\n"))
    if opts.get('_zero'):
        cmd['-0'] = None
    cmd.append('.')
    for include in args:
        cmd['-I'] = procutil.shellquote(include)

    ui.status((bytes(cmd)), "\n")

def merge(ui, repo, *args, **kwargs):
    cmdoptions = [
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('merge')

    if len(args) > 0:
        cmd.append(args[len(args) - 1])

    ui.status((bytes(cmd)), "\n")

def mergebase(ui, repo, *args, **kwargs):
    cmdoptions = []
    args, opts = parseoptions(ui, cmdoptions, args)

    if len(args) != 2:
        args = ['A', 'B']

    cmd = Command("log -T '{node}\\n' -r 'ancestor(%s,%s)'"
                  % (args[0], args[1]))

    ui.status(_('note: ancestors() is part of the revset language\n'),
              _("(learn more about revsets with 'hg help revsets')\n\n"))
    ui.status((bytes(cmd)), "\n")

def mergetool(ui, repo, *args, **kwargs):
    cmdoptions = []
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command("resolve")

    if len(args) == 0:
        cmd['--all'] = None
    cmd.extend(args)
    ui.status((bytes(cmd)), "\n")

def mv(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('f', 'force', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('mv')
    cmd.extend(args)

    if opts.get('force'):
        cmd['-f'] = None

    ui.status((bytes(cmd)), "\n")

def pull(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'all', None, ''),
        ('f', 'force', None, ''),
        ('r', 'rebase', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('pull')
    cmd['--rebase'] = None

    if len(args) > 0:
        cmd.append(args[0])
        if len(args) > 1:
            ui.status(_("note: Mercurial doesn't have refspecs. "
                        "-r can be used to specify which commits you want to "
                        "pull. -B can be used to specify which bookmark you "
                        "want to pull.\n\n"))
            for v in args[1:]:
                if v in repo._bookmarks:
                    cmd['-B'] = v
                else:
                    cmd['-r'] = v

    ui.status((bytes(cmd)), "\n")

def push(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'all', None, ''),
        ('f', 'force', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('push')

    if len(args) > 0:
        cmd.append(args[0])
        if len(args) > 1:
            ui.status(_("note: Mercurial doesn't have refspecs. "
                        "-r can be used to specify which commits you want "
                        "to push. -B can be used to specify which bookmark "
                        "you want to push.\n\n"))
            for v in args[1:]:
                if v in repo._bookmarks:
                    cmd['-B'] = v
                else:
                    cmd['-r'] = v

    if opts.get('force'):
        cmd['-f'] = None

    ui.status((bytes(cmd)), "\n")

def rebase(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'all', None, ''),
        ('i', 'interactive', None, ''),
        ('', 'onto', '', ''),
        ('', 'abort', None, ''),
        ('', 'continue', None, ''),
        ('', 'skip', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    if opts.get('interactive'):
        ui.status(_("note: hg histedit does not perform a rebase. "
                    "It just edits history.\n\n"))
        cmd = Command('histedit')
        if len(args) > 0:
            ui.status(_("also note: 'hg histedit' will automatically detect"
                      " your stack, so no second argument is necessary\n\n"))
        ui.status((bytes(cmd)), "\n")
        return

    if opts.get('skip'):
        cmd = Command('revert --all -r .')
        ui.status((bytes(cmd)), "\n")

    cmd = Command('rebase')

    if opts.get('continue') or opts.get('skip'):
        cmd['--continue'] = None
    if opts.get('abort'):
        cmd['--abort'] = None

    if opts.get('onto'):
        ui.status(_("note: if you're trying to lift a commit off one branch, "
                    "try hg rebase -d <destination commit> -s <commit to be "
                    "lifted>\n\n"))
        cmd['-d'] = convert(opts.get('onto'))
        if len(args) < 2:
            raise error.Abort(_("expected format: git rebase --onto X Y Z"))
        cmd['-s'] = "'::%s - ::%s'" % (convert(args[1]), convert(args[0]))
    else:
        if len(args) == 1:
            cmd['-d'] = convert(args[0])
        elif len(args) == 2:
            cmd['-d'] = convert(args[0])
            cmd['-b'] = convert(args[1])

    ui.status((bytes(cmd)), "\n")

def reflog(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'all', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('journal')
    if opts.get('all'):
        cmd['--all'] = None
    if len(args) > 0:
        cmd.append(args[0])

    ui.status(bytes(cmd), "\n\n")
    ui.status(_("note: in hg commits can be deleted from repo but we always"
              " have backups\n"))

def reset(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'soft', None, ''),
        ('', 'hard', None, ''),
        ('', 'mixed', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    commit = convert(args[0] if len(args) > 0 else '.')
    hard = opts.get('hard')

    if opts.get('mixed'):
        ui.status(_('note: --mixed has no meaning since Mercurial has no '
                    'staging area\n\n'))
    if opts.get('soft'):
        ui.status(_('note: --soft has no meaning since Mercurial has no '
                    'staging area\n\n'))

    cmd = Command('update')
    if hard:
        cmd.append('--clean')

    cmd.append(commit)

    ui.status((bytes(cmd)), "\n")

def revert(ui, repo, *args, **kwargs):
    cmdoptions = [
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    if len(args) > 1:
        ui.status(_("note: hg backout doesn't support multiple commits at "
                    "once\n\n"))

    cmd = Command('backout')
    if args:
        cmd.append(args[0])

    ui.status((bytes(cmd)), "\n")

def revparse(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'show-cdup', None, ''),
        ('', 'show-toplevel', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    if opts.get('show_cdup') or opts.get('show_toplevel'):
        cmd = Command('root')
        if opts.get('show_cdup'):
            ui.status(_("note: hg root prints the root of the repository\n\n"))
        ui.status((bytes(cmd)), "\n")
    else:
        ui.status(_("note: see hg help revset for how to refer to commits\n"))

def rm(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('f', 'force', None, ''),
        ('n', 'dry-run', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('rm')
    cmd.extend(args)

    if opts.get('force'):
        cmd['-f'] = None
    if opts.get('dry_run'):
        cmd['-n'] = None

    ui.status((bytes(cmd)), "\n")

def show(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'name-status', None, ''),
        ('', 'pretty', '', ''),
        ('U', 'unified', int, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    if opts.get('name_status'):
        if opts.get('pretty') == 'format:':
            cmd = Command('status')
            cmd['--change'] = '.'
        else:
            cmd = Command('log')
            cmd.append('--style status')
            cmd.append('-r .')
    elif len(args) > 0:
        if ispath(repo, args[0]):
            cmd = Command('cat')
        else:
            cmd = Command('export')
        cmd.extend(args)
        if opts.get('unified'):
            cmd.append('--config diff.unified=%d' % (opts['unified'],))
    elif opts.get('unified'):
        cmd = Command('export')
        cmd.append('--config diff.unified=%d' % (opts['unified'],))
    else:
        cmd = Command('export')

    ui.status((bytes(cmd)), "\n")

def stash(ui, repo, *args, **kwargs):
    cmdoptions = [
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('shelve')
    action = args[0] if len(args) > 0 else None

    if action == 'list':
        cmd['-l'] = None
    elif action == 'drop':
        cmd['-d'] = None
        if len(args) > 1:
            cmd.append(args[1])
        else:
            cmd.append('<shelve name>')
    elif action == 'pop' or action == 'apply':
        cmd = Command('unshelve')
        if len(args) > 1:
            cmd.append(args[1])
        if action == 'apply':
            cmd['--keep'] = None
    elif (action == 'branch' or action == 'show' or action == 'clear'
        or action == 'create'):
        ui.status(_("note: Mercurial doesn't have equivalents to the "
                    "git stash branch, show, clear, or create actions\n\n"))
        return
    else:
        if len(args) > 0:
            if args[0] != 'save':
                cmd['--name'] = args[0]
            elif len(args) > 1:
                cmd['--name'] = args[1]

    ui.status((bytes(cmd)), "\n")

def status(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('', 'ignored', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('status')
    cmd.extend(args)

    if opts.get('ignored'):
        cmd['-i'] = None

    ui.status((bytes(cmd)), "\n")

def svn(ui, repo, *args, **kwargs):
    if not args:
        raise error.Abort(_('missing svn command'))
    svncmd = args[0]
    if svncmd not in gitsvncommands:
        raise error.Abort(_('unknown git svn command "%s"') % (svncmd))

    args = args[1:]
    return gitsvncommands[svncmd](ui, repo, *args, **kwargs)

def svndcommit(ui, repo, *args, **kwargs):
    cmdoptions = [
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('push')

    ui.status((bytes(cmd)), "\n")

def svnfetch(ui, repo, *args, **kwargs):
    cmdoptions = [
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    cmd = Command('pull')
    cmd.append('default-push')

    ui.status((bytes(cmd)), "\n")

def svnfindrev(ui, repo, *args, **kwargs):
    cmdoptions = [
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    if not args:
        raise error.Abort(_('missing find-rev argument'))

    cmd = Command('log')
    cmd['-r'] = args[0]

    ui.status((bytes(cmd)), "\n")

def svnrebase(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('l', 'local', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    pullcmd = Command('pull')
    pullcmd.append('default-push')
    rebasecmd = Command('rebase')
    rebasecmd.append('tip')

    cmd = pullcmd & rebasecmd

    ui.status((bytes(cmd)), "\n")

def tag(ui, repo, *args, **kwargs):
    cmdoptions = [
        ('f', 'force', None, ''),
        ('l', 'list', None, ''),
        ('d', 'delete', None, ''),
    ]
    args, opts = parseoptions(ui, cmdoptions, args)

    if opts.get('list'):
        cmd = Command('tags')
    else:
        cmd = Command('tag')

        if not args:
            raise error.Abort(_('missing tag argument'))

        cmd.append(args[0])
        if len(args) > 1:
            cmd['-r'] = args[1]

        if opts.get('delete'):
            cmd['--remove'] = None

        if opts.get('force'):
            cmd['-f'] = None

    ui.status((bytes(cmd)), "\n")

gitcommands = {
    'add': add,
    'am': am,
    'apply': apply,
    'bisect': bisect,
    'blame': blame,
    'branch': branch,
    'checkout': checkout,
    'cherry-pick': cherrypick,
    'clean': clean,
    'clone': clone,
    'commit': commit,
    'diff': diff,
    'difftool': difftool,
    'fetch': fetch,
    'grep': grep,
    'init': init,
    'log': log,
    'ls-files': lsfiles,
    'merge': merge,
    'merge-base': mergebase,
    'mergetool': mergetool,
    'mv': mv,
    'pull': pull,
    'push': push,
    'rebase': rebase,
    'reflog': reflog,
    'reset': reset,
    'revert': revert,
    'rev-parse': revparse,
    'rm': rm,
    'show': show,
    'stash': stash,
    'status': status,
    'svn': svn,
    'tag': tag,
    'whatchanged': deprecated,
}

gitsvncommands = {
    'dcommit': svndcommit,
    'fetch': svnfetch,
    'find-rev': svnfindrev,
    'rebase': svnrebase,
}