help/templates.txt

    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.
    :latesttag: String. Most recent global tag in the ancestors of this
                changeset.
    :latesttagdistance: Integer. Longest path to the latest tag.

    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 <[e-mail]>' becomes
                  'example.com'.
    :email:       Any text. Extracts the first string that looks like
                  an email address. Example: 'User <[e-mail]>'
                  becomes '[e-mail]'.
    :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:
                  "2009-08-18 13:00 +0200".
    :isodatesec:  Date. Returns the date in ISO 8601 format, including
                  seconds: "2009-08-18 13:00:13 +0200". See also the
                  rfc3339date filter.
    :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: "Tue, 18 Aug 2009 13:00:13 +0200".
    :rfc3339date: Date. Returns a date using the Internet date format
                  specified in RFC 3339: "2009-08-18T13:00:13+02:00".
    :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.