Changes between Initial Version and Version 1 of WikiMacros

Timestamp:

02/23/05 16:07:38 (20 years ago)

Author:

trac

Comment:

--

WikiMacros

@@ +1 @@
+=  Wiki 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). See also: WikiProcessors.
+
+== Using Macros ==
+Macro calls are enclosed in two ''square brackets''. Like python functions, macros can also have arguments, a comma separated list within parenthesis. 
+
+=== Examples ===
+
+{{{
+ [[Timestamp]]
+}}}
+Display:
+ [[Timestamp]]
+
+{{{
+ [[HelloWorld(Testing)]]
+}}}
+Display:
+ [[HelloWorld(Testing)]]
+
+
+== Available Macros ==
+Macros are still a new feature, and the list of available (and distributed) macros is 
+admittedly not very impressive. In future Trac releases, we hope to build a library of useful macros, and will of course happily include contributed macros (see below). 
+
+ * '''!HelloWorld''' -- An example macro, useful for learning how to write macros.
+ * '''Timestamp''' -- Insert the current date and time.
+
+
+----
+
+
+== Macros from around the world ==
+The [http://projects.edgewall.com/trac/ Trac Project] has a section dedicated to user-contributed macros, [http://projects.edgewall.com/trac/wiki/MacroBazaar MacroBazaar]. If you're looking for new macros, or have written new ones to share with the world, don't hesitate adding it to the [http://projects.edgewall.com/trac/wiki/MacroBazaar MacroBazaar] wiki page.
+
+  http://projects.edgewall.com/trac/wiki/MacroBazaar
+
+
+----
+
+
+== Developing New Macros ==
+Macros, like Trac itself, are written in the [http://www.python.org/ Python programming language]. They are very simple modules, identified by the filename and should contain a single ''entry point'' function. Trac will display the returned data inserted into the HTML where the macro was called.
+
+It's easiest to learn from an example:
+{{{
+# MyMacro.py -- The world's simplest macro
+
+def execute(hdf, args, env):
+    return "Hello World called with args: %s" % args
+}}}
+
+=== Advanced Topics: Template-enabled Macros ===
+For advanced uses, macros can also render structured output in HDF, to be rendered to HTML using clearsilver templates - like most Trac output. In short, this allows more generic and well-designed advanced macros.
+
+Macros gain direct access to the main HDF tree, and are free to manipulate it. 
+
+Example:
+{{{
+def execute(hdf, args, env):
+    # Currently hdf is set only when the macro is called
+    # From a wiki page
+    if hdf:
+        hdf.setValue('wiki.macro.greeting', 'Hello World')
+        
+    # args will be null if the macro is called without parentesis.
+    args = args or 'No arguments'
+    return 'Hello World, args = ' + args
+}}}
+
+You can also use the environment (env) object to access configuration data.
+
+Example.
+{{{
+def execute(hdf, txt, env):
+    return env.get_config('trac', 'repository_dir')
+}}}
+----
+See also:  WikiProcessors, WikiFormatting, TracGuide