Trac Macros

Trac macros are plugins to extend the Trac engine with custom 'functions' written in Python. A macro inserts dynamic HTML data in any context supporting WikiFormatting.

Another kind of macros are WikiProcessors. They typically deal with alternate markup formats and representation of larger blocks of information (like source code highlighting).

Using Macros

Macro calls are enclosed in two square brackets. Like Python functions, macros can also have arguments, a comma separated list within parentheses.

Trac macros can also be written as TracPlugins. This gives them some capabilities that macros do not have, such as being able to directly access the HTTP request.


A list of 3 most recently changed wiki pages starting with 'Trac':






Available Macros

Note that the following list will only contain the macro documentation if you've not enabled -OO optimizations, or not set the PythonOptimize option for mod_python.


Provide a list of known InterTrac prefixes.


Inserts an alphabetic list of all wiki pages into the output.

Accepts a prefix string as parameter: if provided, only pages with names that start with the prefix are included in the resulting list. If this parameter is omitted, all pages are listed.

Alternate format and depth can be specified:

  • format=group: The list of page will be structured in groups according to common prefix. This format also supports a min=n argument, where n is the minimal number of pages for a group.
  • depth=n: limit the depth of the pages to list. If set to 0, only toplevel pages will be shown, if set to 1, only immediate children pages will be shown, etc. If not set, or set to -1, all pages in the hierarchy will be shown.

Lists all pages that have recently been modified, grouping them by the day they were last modified.

This macro accepts two parameters. The first is a prefix string: if provided, only pages with names that start with the prefix are included in the resulting list. If this parameter is omitted, all pages are listed.

The second parameter is a number for limiting the number of pages returned. For example, specifying a limit of 5 will result in only the five most recently changed pages to be included in the list.


Displays a structural outline of the current wiki page, each item in the outline being a link to the corresponding heading.

This macro accepts three optional parameters:

  • The first is a number or range that allows configuring the minimum and maximum level of headings that should be included in the outline. For example, specifying "1" here will result in only the top-level headings being included in the outline. Specifying "2-3" will make the outline include all headings of level 2 and 3, as a nested list. The default is to include all heading levels.
  • The second parameter can be used to specify a custom title (the default is no title).
  • The third parameter selects the style of the outline. This can be either inline or pullout (the latter being the default). The inline style renders the outline as normal part of the content, while pullout causes the outline to be rendered in a box that is by default floated to the right side of the other content.

Embed an image in wiki-formatted text.

The first argument is the file specification. The file specification may reference attachments in three ways:

  • module:id:file, where module can be either wiki or ticket, to refer to the attachment named file of the specified wiki page or ticket.
  • id:file: same as above, but id is either a ticket shorthand or a Wiki page name.
  • file to refer to a local attachment named 'file'. This only works from within that wiki page or a ticket.

Also, the file specification may refer to repository files, using the source:file syntax (source:file@rev works also).

Files can also be accessed with a direct URLs; /file for a project-relative, //file for a server-relative, or http://server/file for absolute location of the file.

The remaining arguments are optional and allow configuring the attributes and style of the rendered <img> element:

  • digits and unit are interpreted as the size (ex. 120, 25%) for the image
  • right, left, top or bottom are interpreted as the alignment for the image
  • link=some TracLinks... replaces the link to the image source by the one specified using a TracLinks. If no value is specified, the link is simply removed.
  • nolink means without link to image source (deprecated, use link=)
  • key=value style are interpreted as HTML attributes or CSS style indications for the image. Valid keys are:
    • align, border, width, height, alt, title, longdesc, class, id and usemap
    • border can only be a number


    [[Image(photo.jpg)]]                           # simplest
    [[Image(photo.jpg, 120px)]]                    # with image width size
    [[Image(photo.jpg, right)]]                    # aligned by keyword
    [[Image(photo.jpg, nolink)]]                   # without link to source
    [[Image(photo.jpg, align=right)]]              # aligned by attribute

You can use image from other page, other ticket or other module.

    [[Image(OtherPage:foo.bmp)]]    # if current module is wiki
    [[Image(base/sub:bar.bmp)]]     # from hierarchical wiki page
    [[Image(#3:baz.bmp)]]           # if in a ticket, point to #3
    [[Image(source:/images/bee.jpg)]] # straight from the repository!
    [[Image(htdocs:foo/bar.png)]]   # image file in project htdocs dir.

Adapted from the macro created by Shun-ichi Goto <gotoh@…>


Displays a list of all installed Wiki macros, including documentation if available.

Optionally, the name of a specific macro can be provided as an argument. In that case, only the documentation for that macro will be rendered.

Note that this macro will not be able to display the documentation of macros if the PythonOptimize option is enabled for mod_python!


Produce documentation for Trac configuration file.

Typically, this will be used in the TracIni page. Optional arguments are a configuration section filter, and a configuration option name filter: only the configuration options whose section and name start with the filters are output.


This macro shows a quick and dirty way to make a table-of-contents for a set of wiki pages.


Provide a description list for the known InterWiki prefixes.


Displays help for trac-admin commands.


[[TracAdminHelp]]               # all commands
[[TracAdminHelp(wiki)]]         # all wiki commands
[[TracAdminHelp(wiki export)]]  # the "wiki export" command
[[TracAdminHelp(upgrade)]]      # the upgrade command

Embed online movies from YouTube?, GoogleVideo? and MetaCafe?, and local movies via FlowPlayer?.


Everybody Macro

call me as:


Date Macro used in the Schedule page. Usage:

  • without link, without title:
    [[Date(YYYY-MM-DD; nolink)]]
  • withlink, without title:
    [[Date(YYYY-MM-DD; LinkedWikiPage)]]
  • with link, with title:
    [[Date(YYYY-MM-DD; LinkedWikiPage; Some title next to the date...)]]
  • without link, with title:
    [[Date(YYYY-MM-DD; nolink; Some title next to the date, which can contain comas)]]

do not use semicolons, except as separators as shown above'''


WorkGroup Macro

The WorkGroup Macro takes exactly three arguments, separated by semicolons. The arguments are:

  1. Workgroup Short Name, i.e. poker09, a sequence of lowercase letters, followed by two digits.
  2. Display style, explained below...
  3. The long workgroup title, the string to be displayed as title, i.e. Poker Group 2009

There are multiple styles for the WorkGroup Macro:

  1. 'short' - title and a single line member list
  2. 'long' - title and a memper list with one member per line
  3. 'members' - as 'title' but only the member list, no title
  4. 'titleonly' - no member list, only the title part

Some valid examples:

[[WorkGroup(poker09; short; Poker Group 2009)]]

[[WorkGroup(poker09; long; Poker Group 2009)]]

[[WorkGroup(poker09; memberlist; the title field is ignored, but don't forget the semicolon after the style 'memberlist')]]

[[WorkGroup(poker09; titleonly; Poker Group 2009)]]


FacesPage? Macro give group name as argument...


Mail Macro Use this to protect Email addresses from spam bots!

Example for encoding the address…

[[Mail(, my, university, org)]]

i.e. leave everything intact which comes before the '@', then replace the '@' and any '.' with ', '...


LoginCheck Macro

Usage simply:



Person Macro

The Person Macro takes somebodys login name as its argument, e.g.


If you do not know somebodys login name, or he is not registered yet, please just give that persons full name as an argument, e.g.

[[Person(Daniel Fasnacht)]]

If, as in the second example, the argument is not a valid username, the macro does a fuzzy string comparison to the names of all persons known to the system, and the chooses the best match...

You can also give multiple names separated by commas to create a list of names:

[[Person(Daniel Fasnacht, Giacomo Indiveri, Tobi Delbruck)]]


Color Macro Syntax Usage:

[[Color(color;background-color; text )]]

or without setting a background color:

[[Color(color;; text )]]

Where color:

Is a color keyword or hex color number recognised by your browser, i.e. black, red or #FF0000


TODO Macro Syntax Usage:


or with more text:

[[TODO(what to do...)]]


CHECK Macro Syntax Usage:


or with more text:

[[CHECK(what to do...)]]


Have some fun!

( by dumping and exploring some trac-internal structures ;-)


Participants Macro

Give the event as argument, e.g.


A Trac macro to limit access to parts of a trac page.


A Trac macro to limit access to parts of a trac page.


A Trac macro to limit access to parts of a trac page.


A Trac macro to limit access to parts of a trac page.

Macros from around the world

The  Trac Hacks site provides a wide collection of macros and other Trac plugins contributed by the Trac community. If you're looking for new macros, or have written one that you'd like to share with the world, please don't hesitate to visit that site.

Developing Custom Macros

Macros, like Trac itself, are written in the  Python programming language.

For more information about developing macros, see the  development resources on the main project site.


Here are 2 simple examples showing how to create a Macro with Trac 0.11.

Also, have a look at for an example that shows the difference between old style and new style macros and at the  macros/README which provides a little more insight about the transition.

Macro without arguments

It should be saved as (in the TracEnvironment's plugins/ directory) as Trac will use the module name as the Macro name.

from datetime import datetime
# Note: since Trac 0.11, datetime objects are used internally

from genshi.builder import tag

from trac.util.datefmt import format_datetime, utc
from import WikiMacroBase

class TimeStampMacro(WikiMacroBase):
    """Inserts the current time (in seconds) into the wiki page."""

    revision = "$Rev$"
    url = "$URL$"

    def expand_macro(self, formatter, name, args):
        t =
        return tag.b(format_datetime(t, '%c'))

Macro with arguments

It should be saved as (in the TracEnvironment's plugins/ directory) as Trac will use the module name as the Macro name.

from import WikiMacroBase

class HelloWorldMacro(WikiMacroBase):
    """Simple HelloWorld macro.

    Note that the name of the class is meaningful:
     - it must end with "Macro"
     - what comes before "Macro" ends up being the macro name

    The documentation of the class (i.e. what you're reading)
    will become the documentation of the macro, as shown by
    the !MacroList macro (usually used in the WikiMacros page).

    revision = "$Rev$"
    url = "$URL$"

    def expand_macro(self, formatter, name, args):
        """Return some output that will be displayed in the Wiki content.

        `name` is the actual name of the macro (no surprise, here it'll be
        `args` is the text enclosed in parenthesis at the call of the macro.
          Note that if there are ''no'' parenthesis (like in, e.g.
          [[HelloWorld]]), then `args` is `None`.
        return 'Hello World, args = ' + unicode(args)
    # Note that there's no need to HTML escape the returned data,
    # as the template engine (Genshi) will do it for us.

expand_macro details

expand_macro should return either a simple Python string which will be interpreted as HTML, or preferably a Markup object (use from trac.util.html import Markup). Markup(string) just annotates the string so the renderer will render the HTML string as-is with no escaping. You will also need to import Formatter using from import Formatter.

If your macro creates wiki markup instead of HTML, you can convert it to HTML like this:

  text = "whatever wiki markup you want, even containing other macros"
  # Convert Wiki markup to HTML, new style
  out = StringIO()
  Formatter(self.env, formatter.context).format(text, out)
  return Markup(out.getvalue())