[[Image]]
Embed an image in wiki-formatted text.
The first argument is the file, as in
[[Image(filename.png)]]
[[InterTrac]]
Provide a list of known
InterTrac prefixes.
[[InterWiki]]
Provide a description list for the known
InterWiki prefixes.
[[KnownMimeTypes]]
List all known mime-types which can be used as
WikiProcessors.
}}}
etc.
}}}
== 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 [wiki:TracModPython mod_python].''
[[MacroList]]
== Macros from around the world
The [http://trac-hacks.org/ Trac Hacks] site provides a wide collection of macros and other Trac [TracPlugins plugins] contributed by the Trac community. If you are looking for new macros, or have written one that you would like to share, please visit that site.
== Developing Custom Macros
Macros, like Trac itself, are written in the [http://python.org/ Python programming language] and are developed as part of TracPlugins.
For more information about developing macros, see the [trac:TracDev development resources] on the main project site.
Here are 2 simple examples showing how to create a Macro. Also, have a look at [trac:source:tags/trac-1.0.2/sample-plugins/Timestamp.py Timestamp.py] for an example that shows the difference between old style and new style macros and at the [trac:source:tags/trac-0.11/wiki-macros/README macros/README] which provides more insight about the transition.
=== Macro without arguments
To test the following code, save it in a `timestamp_sample.py` file located in the TracEnvironment's `plugins/` directory.
{{{#!python
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 trac.wiki.macros 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, text):
t = datetime.now(utc)
return tag.strong(format_datetime(t, '%c'))
}}}
=== Macro with arguments
To test the following code, save it in a `helloworld_sample.py` file located in the TracEnvironment's `plugins/` directory.
{{{#!python
from genshi.core import Markup
from trac.wiki.macros 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, text, 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
`'HelloWorld'`),
`text` 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 `text` is `None`.
`args` are the arguments passed when HelloWorld is called using a
`#!HelloWorld` code block.
"""
return 'Hello World, text = %s, args = %s' % \
(Markup.escape(text), Markup.escape(repr(args)))
}}}
Note that `expand_macro` optionally takes a 4^th^ parameter ''`args`''. When the macro is called as a [WikiProcessors WikiProcessor], it is also possible to pass `key=value` [WikiProcessors#UsingProcessors processor parameters]. If given, those are stored in a dictionary and passed in this extra `args` parameter. In the other case, when called as a macro, `args` is `None`. (''since 0.12'').
For example, when writing:
{{{
{{{#!HelloWorld style="polite" -silent verbose