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diff --git a/sys/src/cmd/hg/mercurial/help.py b/sys/src/cmd/hg/mercurial/help.py
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+# help.py - help data for mercurial
+#
+# Copyright 2006 Matt Mackall <mpm@selenic.com>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2, incorporated herein by reference.
+
+from i18n import _
+import extensions, util
+
+
+def moduledoc(file):
+    '''return the top-level python documentation for the given file
+
+    Loosely inspired by pydoc.source_synopsis(), but rewritten to handle \'''
+    as well as """ and to return the whole text instead of just the synopsis'''
+    result = []
+
+    line = file.readline()
+    while line[:1] == '#' or not line.strip():
+        line = file.readline()
+        if not line: break
+
+    start = line[:3]
+    if start == '"""' or start == "'''":
+        line = line[3:]
+        while line:
+            if line.rstrip().endswith(start):
+                line = line.split(start)[0]
+                if line:
+                    result.append(line)
+                break
+            elif not line:
+                return None # unmatched delimiter
+            result.append(line)
+            line = file.readline()
+    else:
+        return None
+
+    return ''.join(result)
+
+def listexts(header, exts, maxlength):
+    '''return a text listing of the given extensions'''
+    if not exts:
+        return ''
+    result = '\n%s\n\n' % header
+    for name, desc in sorted(exts.iteritems()):
+        result += ' %-*s %s\n' % (maxlength + 2, ':%s:' % name, desc)
+    return result
+
+def extshelp():
+    doc = _(r'''
+    Mercurial has the ability to add new features through the use of
+    extensions. Extensions may add new commands, add options to
+    existing commands, change the default behavior of commands, or
+    implement hooks.
+
+    Extensions are not loaded by default for a variety of reasons:
+    they can increase startup overhead; they may be meant for advanced
+    usage only; they may provide potentially dangerous abilities (such
+    as letting you destroy or modify history); they might not be ready
+    for prime time; or they may alter some usual behaviors of stock
+    Mercurial. It is thus up to the user to activate extensions as
+    needed.
+
+    To enable the "foo" extension, either shipped with Mercurial or in
+    the Python search path, create an entry for it in your hgrc, like
+    this::
+
+      [extensions]
+      foo =
+
+    You may also specify the full path to an extension::
+
+      [extensions]
+      myfeature = ~/.hgext/myfeature.py
+
+    To explicitly disable an extension enabled in an hgrc of broader
+    scope, prepend its path with !::
+
+      [extensions]
+      # disabling extension bar residing in /path/to/extension/bar.py
+      hgext.bar = !/path/to/extension/bar.py
+      # ditto, but no path was supplied for extension baz
+      hgext.baz = !
+    ''')
+
+    exts, maxlength = extensions.enabled()
+    doc += listexts(_('enabled extensions:'), exts, maxlength)
+
+    exts, maxlength = extensions.disabled()
+    doc += listexts(_('disabled extensions:'), exts, maxlength)
+
+    return doc
+
+helptable = (
+    (["dates"], _("Date Formats"),
+     _(r'''
+    Some commands allow the user to specify a date, e.g.:
+
+    - backout, commit, import, tag: Specify the commit date.
+    - log, revert, update: Select revision(s) by date.
+
+    Many date formats are valid. Here are some examples::
+
+      "Wed Dec 6 13:18:29 2006" (local timezone assumed)
+      "Dec 6 13:18 -0600" (year assumed, time offset provided)
+      "Dec 6 13:18 UTC" (UTC and GMT are aliases for +0000)
+      "Dec 6" (midnight)
+      "13:18" (today assumed)
+      "3:39" (3:39AM assumed)
+      "3:39pm" (15:39)
+      "2006-12-06 13:18:29" (ISO 8601 format)
+      "2006-12-6 13:18"
+      "2006-12-6"
+      "12-6"
+      "12/6"
+      "12/6/6" (Dec 6 2006)
+
+    Lastly, there is Mercurial's internal format::
+
+      "1165432709 0" (Wed Dec 6 13:18:29 2006 UTC)
+
+    This is the internal representation format for dates. unixtime is
+    the number of seconds since the epoch (1970-01-01 00:00 UTC).
+    offset is the offset of the local timezone, in seconds west of UTC
+    (negative if the timezone is east of UTC).
+
+    The log command also accepts date ranges::
+
+      "<{datetime}" - at or before a given date/time
+      ">{datetime}" - on or after a given date/time
+      "{datetime} to {datetime}" - a date range, inclusive
+      "-{days}" - within a given number of days of today
+    ''')),
+
+    (["patterns"], _("File Name Patterns"),
+     _(r'''
+    Mercurial accepts several notations for identifying one or more
+    files at a time.
+
+    By default, Mercurial treats filenames as shell-style extended
+    glob patterns.
+
+    Alternate pattern notations must be specified explicitly.
+
+    To use a plain path name without any pattern matching, start it
+    with "path:". These path names must completely match starting at
+    the current repository root.
+
+    To use an extended glob, start a name with "glob:". Globs are
+    rooted at the current directory; a glob such as "``*.c``" will
+    only match files in the current directory ending with ".c".
+
+    The supported glob syntax extensions are "``**``" to match any
+    string across path separators and "{a,b}" to mean "a or b".
+
+    To use a Perl/Python regular expression, start a name with "re:".
+    Regexp pattern matching is anchored at the root of the repository.
+
+    Plain examples::
+
+      path:foo/bar   a name bar in a directory named foo in the root
+                     of the repository
+      path:path:name a file or directory named "path:name"
+
+    Glob examples::
+
+      glob:*.c       any name ending in ".c" in the current directory
+      *.c            any name ending in ".c" in the current directory
+      **.c           any name ending in ".c" in any subdirectory of the
+                     current directory including itself.
+      foo/*.c        any name ending in ".c" in the directory foo
+      foo/**.c       any name ending in ".c" in any subdirectory of foo
+                     including itself.
+
+    Regexp examples::
+
+      re:.*\.c$      any name ending in ".c", anywhere in the repository
+
+    ''')),
+
+    (['environment', 'env'], _('Environment Variables'),
+     _(r'''
+HG
+    Path to the 'hg' executable, automatically passed when running
+    hooks, extensions or external tools. If unset or empty, this is
+    the hg executable's name if it's frozen, or an executable named
+    'hg' (with %PATHEXT% [defaulting to COM/EXE/BAT/CMD] extensions on
+    Windows) is searched.
+
+HGEDITOR
+    This is the name of the editor to run when committing. See EDITOR.
+
+    (deprecated, use .hgrc)
+
+HGENCODING
+    This overrides the default locale setting detected by Mercurial.
+    This setting is used to convert data including usernames,
+    changeset descriptions, tag names, and branches. This setting can
+    be overridden with the --encoding command-line option.
+
+HGENCODINGMODE
+    This sets Mercurial's behavior for handling unknown characters
+    while transcoding user input. The default is "strict", which
+    causes Mercurial to abort if it can't map a character. Other
+    settings include "replace", which replaces unknown characters, and
+    "ignore", which drops them. This setting can be overridden with
+    the --encodingmode command-line option.
+
+HGMERGE
+    An executable to use for resolving merge conflicts. The program
+    will be executed with three arguments: local file, remote file,
+    ancestor file.
+
+    (deprecated, use .hgrc)
+
+HGRCPATH
+    A list of files or directories to search for hgrc files. Item
+    separator is ":" on Unix, ";" on Windows. If HGRCPATH is not set,
+    platform default search path is used. If empty, only the .hg/hgrc
+    from the current repository is read.
+
+    For each element in HGRCPATH:
+
+    - if it's a directory, all files ending with .rc are added
+    - otherwise, the file itself will be added
+
+HGUSER
+    This is the string used as the author of a commit. If not set,
+    available values will be considered in this order:
+
+    - HGUSER (deprecated)
+    - hgrc files from the HGRCPATH
+    - EMAIL
+    - interactive prompt
+    - LOGNAME (with '@hostname' appended)
+
+    (deprecated, use .hgrc)
+
+EMAIL
+    May be used as the author of a commit; see HGUSER.
+
+LOGNAME
+    May be used as the author of a commit; see HGUSER.
+
+VISUAL
+    This is the name of the editor to use when committing. See EDITOR.
+
+EDITOR
+    Sometimes Mercurial needs to open a text file in an editor for a
+    user to modify, for example when writing commit messages. The
+    editor it uses is determined by looking at the environment
+    variables HGEDITOR, VISUAL and EDITOR, in that order. The first
+    non-empty one is chosen. If all of them are empty, the editor
+    defaults to 'vi'.
+
+PYTHONPATH
+    This is used by Python to find imported modules and may need to be
+    set appropriately if this Mercurial is not installed system-wide.
+    ''')),
+
+    (['revs', 'revisions'], _('Specifying Single Revisions'),
+     _(r'''
+    Mercurial supports several ways to specify individual revisions.
+
+    A plain integer is treated as a revision number. Negative integers
+    are treated as sequential offsets from the tip, with -1 denoting
+    the tip, -2 denoting the revision prior to the tip, and so forth.
+
+    A 40-digit hexadecimal string is treated as a unique revision
+    identifier.
+
+    A hexadecimal string less than 40 characters long is treated as a
+    unique revision identifier and is referred to as a short-form
+    identifier. A short-form identifier is only valid if it is the
+    prefix of exactly one full-length identifier.
+
+    Any other string is treated as a tag or branch name. A tag name is
+    a symbolic name associated with a revision identifier. A branch
+    name denotes the tipmost revision of that branch. Tag and branch
+    names must not contain the ":" character.
+
+    The reserved name "tip" is a special tag that always identifies
+    the most recent revision.
+
+    The reserved name "null" indicates the null revision. This is the
+    revision of an empty repository, and the parent of revision 0.
+
+    The reserved name "." indicates the working directory parent. If
+    no working directory is checked out, it is equivalent to null. If
+    an uncommitted merge is in progress, "." is the revision of the
+    first parent.
+    ''')),
+
+    (['mrevs', 'multirevs'], _('Specifying Multiple Revisions'),
+     _(r'''
+    When Mercurial accepts more than one revision, they may be
+    specified individually, or provided as a topologically continuous
+    range, separated by the ":" character.
+
+    The syntax of range notation is [BEGIN]:[END], where BEGIN and END
+    are revision identifiers. Both BEGIN and END are optional. If
+    BEGIN is not specified, it defaults to revision number 0. If END
+    is not specified, it defaults to the tip. The range ":" thus means
+    "all revisions".
+
+    If BEGIN is greater than END, revisions are treated in reverse
+    order.
+
+    A range acts as a closed interval. This means that a range of 3:5
+    gives 3, 4 and 5. Similarly, a range of 9:6 gives 9, 8, 7, and 6.
+    ''')),
+
+    (['diffs'], _('Diff Formats'),
+     _(r'''
+    Mercurial's default format for showing changes between two
+    versions of a file is compatible with the unified format of GNU
+    diff, which can be used by GNU patch and many other standard
+    tools.
+
+    While this standard format is often enough, it does not encode the
+    following information:
+
+    - executable status and other permission bits
+    - copy or rename information
+    - changes in binary files
+    - creation or deletion of empty files
+
+    Mercurial also supports the extended diff format from the git VCS
+    which addresses these limitations. The git diff format is not
+    produced by default because a few widespread tools still do not
+    understand this format.
+
+    This means that when generating diffs from a Mercurial repository
+    (e.g. with "hg export"), you should be careful about things like
+    file copies and renames or other things mentioned above, because
+    when applying a standard diff to a different repository, this
+    extra information is lost. Mercurial's internal operations (like
+    push and pull) are not affected by this, because they use an
+    internal binary format for communicating changes.
+
+    To make Mercurial produce the git extended diff format, use the
+    --git option available for many commands, or set 'git = True' in
+    the [diff] section of your hgrc. You do not need to set this
+    option when importing diffs in this format or using them in the mq
+    extension.
+    ''')),
+    (['templating', 'templates'], _('Template Usage'),
+     _(r'''
+    Mercurial allows you to customize output of commands through
+    templates. You can either pass in a template from the command
+    line, via the --template option, or select an existing
+    template-style (--style).
+
+    You can customize output for any "log-like" command: log,
+    outgoing, incoming, tip, parents, heads and glog.
+
+    Three styles are packaged with Mercurial: default (the style used
+    when no explicit preference is passed), compact and changelog.
+    Usage::
+
+        $ hg log -r1 --style changelog
+
+    A template is a piece of text, with markup to invoke variable
+    expansion::
+
+        $ hg log -r1 --template "{node}\n"
+        b56ce7b07c52de7d5fd79fb89701ea538af65746
+
+    Strings in curly braces are called keywords. The availability of
+    keywords depends on the exact context of the templater. These
+    keywords are usually available for templating a log-like command:
+
+    :author:    String. The unmodified author of the changeset.
+    :branches:  String. The name of the branch on which the changeset
+                was committed. Will be empty if the branch name was
+                default.
+    :date:      Date information. The date when the changeset was
+                committed.
+    :desc:      String. The text of the changeset description.
+    :diffstat:  String. Statistics of changes with the following
+                format: "modified files: +added/-removed lines"
+    :files:     List of strings. All files modified, added, or removed
+                by this changeset.
+    :file_adds: List of strings. Files added by this changeset.
+    :file_mods: List of strings. Files modified by this changeset.
+    :file_dels: List of strings. Files removed by this changeset.
+    :node:      String. The changeset identification hash, as a
+                40-character hexadecimal string.
+    :parents:   List of strings. The parents of the changeset.
+    :rev:       Integer. The repository-local changeset revision
+                number.
+    :tags:      List of strings. Any tags associated with the
+                changeset.
+
+    The "date" keyword does not produce human-readable output. If you
+    want to use a date in your output, you can use a filter to process
+    it. Filters are functions which return a string based on the input
+    variable. You can also use a chain of filters to get the desired
+    output::
+
+       $ hg tip --template "{date|isodate}\n"
+       2008-08-21 18:22 +0000
+
+    List of filters:
+
+    :addbreaks:  Any text. Add an XHTML "<br />" tag before the end of
+                 every line except the last.
+    :age:        Date. Returns a human-readable date/time difference
+                 between the given date/time and the current
+                 date/time.
+    :basename:   Any text. Treats the text as a path, and returns the
+                 last component of the path after splitting by the
+                 path separator (ignoring trailing separators). For
+                 example, "foo/bar/baz" becomes "baz" and "foo/bar//"
+                 becomes "bar".
+    :stripdir:   Treat the text as path and strip a directory level,
+                 if possible. For example, "foo" and "foo/bar" becomes
+                 "foo".
+    :date:       Date. Returns a date in a Unix date format, including
+                 the timezone: "Mon Sep 04 15:13:13 2006 0700".
+    :domain:     Any text. Finds the first string that looks like an
+                 email address, and extracts just the domain
+                 component. Example: 'User <user@example.com>' becomes
+                 'example.com'.
+    :email:      Any text. Extracts the first string that looks like
+                 an email address. Example: 'User <user@example.com>'
+                 becomes 'user@example.com'.
+    :escape:     Any text. Replaces the special XML/XHTML characters
+                 "&", "<" and ">" with XML entities.
+    :fill68:     Any text. Wraps the text to fit in 68 columns.
+    :fill76:     Any text. Wraps the text to fit in 76 columns.
+    :firstline:  Any text. Returns the first line of text.
+    :nonempty:   Any text. Returns '(none)' if the string is empty.
+    :hgdate:     Date. Returns the date as a pair of numbers:
+                 "1157407993 25200" (Unix timestamp, timezone offset).
+    :isodate:    Date. Returns the date in ISO 8601 format.
+    :localdate:  Date. Converts a date to local date.
+    :obfuscate:  Any text. Returns the input text rendered as a
+                 sequence of XML entities.
+    :person:     Any text. Returns the text before an email address.
+    :rfc822date: Date. Returns a date using the same format used in
+                 email headers.
+    :short:      Changeset hash. Returns the short form of a changeset
+                 hash, i.e. a 12-byte hexadecimal string.
+    :shortdate:  Date. Returns a date like "2006-09-18".
+    :strip:      Any text. Strips all leading and trailing whitespace.
+    :tabindent:  Any text. Returns the text, with every line except
+                 the first starting with a tab character.
+    :urlescape:  Any text. Escapes all "special" characters. For
+                 example, "foo bar" becomes "foo%20bar".
+    :user:       Any text. Returns the user portion of an email
+                 address.
+    ''')),
+
+    (['urls'], _('URL Paths'),
+     _(r'''
+    Valid URLs are of the form::
+
+      local/filesystem/path[#revision]
+      file://local/filesystem/path[#revision]
+      http://[user[:pass]@]host[:port]/[path][#revision]
+      https://[user[:pass]@]host[:port]/[path][#revision]
+      ssh://[user[:pass]@]host[:port]/[path][#revision]
+
+    Paths in the local filesystem can either point to Mercurial
+    repositories or to bundle files (as created by 'hg bundle' or 'hg
+    incoming --bundle').
+
+    An optional identifier after # indicates a particular branch, tag,
+    or changeset to use from the remote repository. See also 'hg help
+    revisions'.
+
+    Some features, such as pushing to http:// and https:// URLs are
+    only possible if the feature is explicitly enabled on the remote
+    Mercurial server.
+
+    Some notes about using SSH with Mercurial:
+
+    - SSH requires an accessible shell account on the destination
+      machine and a copy of hg in the remote path or specified with as
+      remotecmd.
+    - path is relative to the remote user's home directory by default.
+      Use an extra slash at the start of a path to specify an absolute
+      path::
+
+        ssh://example.com//tmp/repository
+
+    - Mercurial doesn't use its own compression via SSH; the right
+      thing to do is to configure it in your ~/.ssh/config, e.g.::
+
+        Host *.mylocalnetwork.example.com
+          Compression no
+        Host *
+          Compression yes
+
+      Alternatively specify "ssh -C" as your ssh command in your hgrc
+      or with the --ssh command line option.
+
+    These URLs can all be stored in your hgrc with path aliases under
+    the [paths] section like so::
+
+      [paths]
+      alias1 = URL1
+      alias2 = URL2
+      ...
+
+    You can then use the alias for any command that uses a URL (for
+    example 'hg pull alias1' would pull from the 'alias1' path).
+
+    Two path aliases are special because they are used as defaults
+    when you do not provide the URL to a command:
+
+    default:
+      When you create a repository with hg clone, the clone command
+      saves the location of the source repository as the new
+      repository's 'default' path. This is then used when you omit
+      path from push- and pull-like commands (including incoming and
+      outgoing).
+
+    default-push:
+      The push command will look for a path named 'default-push', and
+      prefer it over 'default' if both are defined.
+    ''')),
+    (["extensions"], _("Using additional features"), extshelp),
+)