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Changes between Version 2 and Version 3 of WikiMacros

Timestamp:: Nov 2, 2011, 3:00:51 PM (13 years ago)
Author:: trac
Comment:: --

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WikiMacros

-                      v2
+                      v3
 == 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.
+=== Getting Detailed Help ===
+The list of available macros and the full help can be obtained using the !MacroList macro, as seen [#AvailableMacros below].
+A brief list can be obtained via ![[MacroList(*)]] or ![[?]].
+Detailed help on a specific macro can be obtained by passing it as an argument to !MacroList, e.g. ![[MacroList(MacroList)]], or, more conveniently, by appending a question mark (?) to the macro's name, like in ![[MacroList?]].
 === Example ===
 …
 A list of 3 most recently changed wiki pages starting with 'Trac':
+{{{
+ [[RecentChanges(Trac,3)]]
+||= Wiki Markup =||= Display =||
+{{{#!td
+  {{{
+  [[RecentChanges(Trac,3)]]
+  }}}
 }}}
+{{{#!td style="padding-left: 2em;"
+[[RecentChanges(Trac,3)]]
+}}}
+|-----------------------------------
+{{{#!td
+  {{{
+  [[RecentChanges?(Trac,3)]]
+  }}}
+}}}
+{{{#!td style="padding-left: 2em;"
+[[RecentChanges?(Trac,3)]]
+}}}
+|-----------------------------------
+{{{#!td
+  {{{
+  [[?]]
+  }}}
+}}}
+{{{#!td style="padding-left: 2em"
+{{{#!html
+<div style="font-size: 80%" class="trac-macrolist">
+<h3><code>[[Image]]</code></h3>Embed an image in wiki-formatted text.
+Display:
+ [[RecentChanges(Trac,3)]]
+The first argument is the file …
+<h3><code>[[InterTrac]]</code></h3>Provide a list of known <a class="wiki" href="/wiki/InterTrac">InterTrac</a> prefixes.
+<h3><code>[[InterWiki]]</code></h3>Provide a description list for the known <a class="wiki" href="/wiki/InterWiki">InterWiki</a> prefixes.
+<h3><code>[[KnownMimeTypes]]</code></h3>List all known mime-types which can be used as <a class="wiki" href="/wiki/WikiProcessors">WikiProcessors</a>.
+Can be …</div>
+}}}
+etc.
+}}}
 == Available Macros ==
 …
 == Developing Custom Macros ==
 Macros, like Trac itself, are written in the [http://python.org/ Python programming language].
+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.
-== Implementation ==
 Here are 2 simple examples showing how to create a Macro with Trac 0.11.
 …
 === Macro without arguments ===
 It should be saved as `TimeStamp.py` (in the TracEnvironment's `plugins/` directory) as Trac will use the module name as the Macro name.
+To test the following code, you should saved it in a `timestamp_sample.py` file located in the TracEnvironment's `plugins/` directory.
 {{{
 #!python
 …
     url = "$URL$"
     def expand_macro(self, formatter, name, args):
+    def expand_macro(self, formatter, name, text):
         t = datetime.now(utc)
         return tag.b(format_datetime(t, '%c'))
 …
 === Macro with arguments ===
 It should be saved as `HelloWorld.py` (in the TracEnvironment's `plugins/` directory) as Trac will use the module name as the Macro name.
+To test the following code, you should saved 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
 …
     url = "$URL$"
     def expand_macro(self, formatter, name, args):
+    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'`),
         `args` is the text enclosed in parenthesis at the call of the macro.
+        `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 `args` is `None`.
+          [[HelloWorld]]), then `text` is `None`.
+        `args` are the arguments passed when HelloWorld is called using a
+        `#!HelloWorld` code block.
         """
+        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.
+        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's 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. On the contrary, when called as a macro, `args` is  `None`. (''since 0.12'').
+=== {{{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 trac.wiki import Formatter}}}.
+For example, when writing:
+{{{
+{{{#!HelloWorld style="polite"
+<Hello World!>
+}}}
+If your macro creates wiki markup instead of HTML, you can convert it to HTML like this:
+{{{#!HelloWorld
+<Hello World!>
+}}}
+[[HelloWorld(<Hello World!>)]]
+}}}
+One should get:
+{{{
+Hello World, text = <Hello World!> , args = {'style': u'polite'}
+Hello World, text = <Hello World!> , args = {}
+Hello World, text = <Hello World!> , args = None
+}}}
+Note that the return value of `expand_macro` is '''not''' HTML escaped. Depending on the expected result, you should escape it by yourself (using `return Markup.escape(result)`) or, if this is indeed HTML, wrap it in a Markup object (`return Markup(result)`) with `Markup` coming from Genshi, (`from genshi.core import Markup`).
+You can also recursively use a wiki Formatter (`from trac.wiki import Formatter`) to process the `text` as wiki markup, for example by doing:
 {{{
 #!python
+  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())
+from genshi.core import Markup
+from trac.wiki.macros import WikiMacroBase
+from trac.wiki import Formatter
+import StringIO
+class HelloWorldMacro(WikiMacroBase):
+        def expand_macro(self, formatter, name, text, args):
+                text = "whatever '''wiki''' markup you want, even containing other macros"
+                # Convert Wiki markup to HTML, new style
+                out = StringIO.StringIO()
+                Formatter(self.env, formatter.context).format(text, out)
+                return Markup(out.getvalue())
 }}}