Changes between Version 5 and Version 6 of WikiMacros

Timestamp:

Nov 23, 2019, 8:07:28 PM (4 years ago)

Author:

trac

Comment:

--

WikiMacros

@@ -1 @@
-= Trac Macros =
+= Trac Macros
 
-[[PageOutline]]
+[[PageOutline(2-5,Contents,pullout)]]
 
-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. Its syntax is `[[macro-name(optional-arguments)]]`.
+'''Trac macros''' extend Trac with custom functionality. Macros are a special type of plugin and are written in Python. A macro generates HTML in any context supporting WikiFormatting.
 
-The WikiProcessors are another kind of macros. They typically deal with alternate markup formats and transformation of larger "blocks" of information (like source code highlighting). They are used for processing the multiline `{{{#!wiki-processor-name ... }}}` blocks.
+The macro syntax is `[[macro-name(optional-arguments)]]`.
 
-== Using Macros ==
+'''WikiProcessors''' are another kind of macro, commonly used for source code highlighting using a processor like `!#python` or `!#apache`:
 
-Macro calls are enclosed in two ''square brackets''. Like Python functions, macros can also have arguments, a comma separated list within parentheses.
+{{{
+{{{#!wiki-processor-name
+... 
+}}}
+}}}
 
-=== Getting Detailed Help ===
-The list of available macros and the full help can be obtained using the !MacroList macro, as seen [#AvailableMacros below].
+== Using Macros
 
-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':
+Macro calls are enclosed in double-square brackets `[[..]]`. Like Python functions macros can have arguments, which take the form of a comma separated list within parentheses `[[..(,)]]`. A common macro used is a list of the 3 most recent changes to a wiki page, or here, for example, all wiki pages starting with 'Trac':
 
 ||= Wiki Markup =||= Display =||
@@ -33 +28 @@
 [[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.
 
-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.
-}}}
+=== Getting Detailed Help
 
-== Available Macros ==
+The list of available macros and the full help can be obtained using the !MacroList macro, see [#AvailableMacros below].
 
-''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].''
+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?]]`.
+
+== Available Macros
 
 [[MacroList]]
 
-== Macros from around the world ==
+== Contributed macros
 
-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'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.
+The [https://trac-hacks.org/ Trac Hacks] site provides a large 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.
+== Developing Custom Macros
 
-For more information about developing macros, see the [trac:TracDev development resources] on the main project site.
+Macros, like Trac itself, are written in the [https://python.org/ Python programming language] and are a type of [TracPlugins plugin].
 
+Here are 2 simple examples showing how to create a Macro. For more information about developing macros, see the [trac:TracDev development resources] and [trac:browser:branches/1.2-stable/sample-plugins sample-plugins].
 
-Here are 2 simple examples showing how to create a Macro with Trac 0.11. 
+=== Macro without arguments
 
-Also, have a look at [trac:source:tags/trac-0.11/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 a little more insight about the transition.
+To test the following code, copy it to `timestamp_sample.py` in the TracEnvironment's `plugins/` directory.
 
-=== Macro without arguments ===
-To test the following code, you should saved 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
+{{{#!python
+from trac.util.datefmt import datetime_now, format_datetime, utc
+from trac.util.html import tag
 from trac.wiki.macros import WikiMacroBase
 
-class TimeStampMacro(WikiMacroBase):
-    """Inserts the current time (in seconds) into the wiki page."""
+class TimestampMacro(WikiMacroBase):
+    _description = "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)
+    def expand_macro(self, formatter, name, content, args=None):
+        t = datetime_now(utc)
         return tag.strong(format_datetime(t, '%c'))
 }}}
 
-=== Macro with arguments ===
-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
+=== Macro with arguments
 
+To test the following code, copy it to `helloworld_sample.py` in the TracEnvironment's `plugins/` directory.
+
+{{{#!python
+from trac.util.translation import cleandoc_
 from trac.wiki.macros import WikiMacroBase
 
 class HelloWorldMacro(WikiMacroBase):
+    _description = cleandoc_(
     """Simple HelloWorld macro.
 
@@ -123 +87 @@
     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):
+    def expand_macro(self, formatter, name, content, args=None):
         """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.
+        `content` 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 `content` is `None`.
+        `args` will contain a dictionary of arguments when called using the
+          Wiki processor syntax and will be `None` if called using the
+          macro syntax.
         """
-        return 'Hello World, text = %s, args = %s' % \
-            (Markup.escape(text), Markup.escape(repr(args)))
-
+        return 'Hello World, content = ' + unicode(content)
 }}}
 
-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'').
+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. When called as a macro, `args` is `None`.
 
 For example, when writing:
@@ -158 +118 @@
 [[HelloWorld(<Hello World!>)]]
 }}}
+
 One should get:
 {{{
-Hello World, text = <Hello World!> , args = {'style': u'polite', 'silent': False, 'verbose': True}
-Hello World, text = <Hello World!> , args = {}
-Hello World, text = <Hello World!> , args = None
+Hello World, text = <Hello World!>, args = {'style': u'polite', 'silent': False, 'verbose': True}
+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`).  
+Note that the return value of `expand_macro` is '''not''' HTML escaped. Depending on the expected result, you should escape it yourself (using `return Markup.escape(result)`), or if this is indeed HTML, wrap it in a Markup object: `return Markup(result)` (`from trac.util.html 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:
+You can also recursively use a wiki formatter to process the `content` as wiki markup:
 
-{{{
-#!python
-from genshi.core import Markup
+{{{#!python
+from trac.wiki.formatter import format_to_html
 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())
+    def expand_macro(self, formatter, name, content, args):
+        content = "any '''wiki''' markup you want, even containing other macros"
+        # Convert Wiki markup to HTML
+        return format_to_html(self.env, formatter.context, content)
 }}}