Changes between Version 2 and Version 3 of WikiMacros


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Timestamp:
05/30/11 20:19:16 (14 years ago)
Author:
trac
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  • WikiMacros

    v2 v3  
    88 
    99== Using Macros == 
    10 Macro calls are enclosed in two ''square brackets''. Like Python functions, macros can also have arguments, a comma separated list within parentheses.  
    1110 
    12 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. 
     11Macro calls are enclosed in two ''square brackets''. Like Python functions, macros can also have arguments, a comma separated list within parentheses. 
     12 
     13=== Getting Detailed Help === 
     14The list of available macros and the full help can be obtained using the !MacroList macro, as seen [#AvailableMacros below]. 
     15 
     16A brief list can be obtained via ![[MacroList(*)]] or ![[?]]. 
     17 
     18Detailed 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?]]. 
     19 
     20 
    1321 
    1422=== Example === 
    … …  
    1624A list of 3 most recently changed wiki pages starting with 'Trac': 
    1725 
    18 {{{ 
    19  [[RecentChanges(Trac,3)]] 
     26||= Wiki Markup =||= Display =|| 
     27{{{#!td 
     28  {{{ 
     29  [[RecentChanges(Trac,3)]] 
     30  }}} 
    2031}}} 
     32{{{#!td style="padding-left: 2em;" 
     33[[RecentChanges(Trac,3)]] 
     34}}} 
     35|----------------------------------- 
     36{{{#!td 
     37  {{{ 
     38  [[RecentChanges?(Trac,3)]] 
     39  }}} 
     40}}} 
     41{{{#!td style="padding-left: 2em;" 
     42[[RecentChanges?(Trac,3)]] 
     43}}} 
     44|----------------------------------- 
     45{{{#!td 
     46  {{{ 
     47  [[?]] 
     48  }}} 
     49}}} 
     50{{{#!td style="padding-left: 2em" 
     51{{{#!html  
     52<div style="font-size: 80%" class="trac-macrolist"> 
     53<h3><code>[[Image]]</code></h3>Embed an image in wiki-formatted text. 
    2154 
    22 Display: 
    23  [[RecentChanges(Trac,3)]] 
     55The first argument is the file … 
     56<h3><code>[[InterTrac]]</code></h3>Provide a list of known <a class="wiki" href="/wiki/InterTrac">InterTrac</a> prefixes. 
     57<h3><code>[[InterWiki]]</code></h3>Provide a description list for the known <a class="wiki" href="/wiki/InterWiki">InterWiki</a> prefixes. 
     58<h3><code>[[KnownMimeTypes]]</code></h3>List all known mime-types which can be used as <a class="wiki" href="/wiki/WikiProcessors">WikiProcessors</a>. 
     59Can be …</div> 
     60}}} 
     61etc. 
     62}}} 
    2463 
    2564== Available Macros == 
    … …  
    3473 
    3574== Developing Custom Macros == 
    36 Macros, like Trac itself, are written in the [http://python.org/ Python programming language]. 
     75Macros, like Trac itself, are written in the [http://python.org/ Python programming language] and are developed as part of TracPlugins. 
    3776 
    38 For more information about developing macros, see the [wiki:TracDev development resources] on the main project site. 
     77For more information about developing macros, see the [trac:TracDev development resources] on the main project site. 
    3978 
    4079 
    41 == Implementation == 
     80Here are 2 simple examples showing how to create a Macro with Trac 0.11.  
    4281 
    43 Here are 2 simple examples on how to create a Macro with [wiki:0.11 Trac 0.11] have a look at source:trunk/sample-plugins/Timestamp.py for an example that shows the difference between old style and new style macros and also source:trunk/wiki-macros/README which provides a little more insight about the transition. 
     82Also, 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. 
    4483 
    4584=== Macro without arguments === 
    46 It should be saved as `TimeStamp.py` as Trac will use the module name as the Macro name 
     85To test the following code, you should saved it in a `timestamp_sample.py` file located in the TracEnvironment's `plugins/` directory. 
    4786{{{ 
    4887#!python 
    … …  
    5594from trac.wiki.macros import WikiMacroBase 
    5695 
    57 class TimestampMacro(WikiMacroBase): 
     96class TimeStampMacro(WikiMacroBase): 
    5897    """Inserts the current time (in seconds) into the wiki page.""" 
    5998 
    … …  
    61100    url = "$URL$" 
    62101 
    63     def expand_macro(self, formatter, name, args): 
     102    def expand_macro(self, formatter, name, text): 
    64103        t = datetime.now(utc) 
    65104        return tag.b(format_datetime(t, '%c')) 
    … …  
    67106 
    68107=== Macro with arguments === 
    69 It should be saved as `HelloWorld.py` (in the plugins/ directory) as Trac will use the module name as the Macro name 
     108To test the following code, you should saved it in a `helloworld_sample.py` file located in the TracEnvironment's `plugins/` directory. 
    70109{{{ 
    71110#!python 
     111from genshi.core import Markup 
     112 
    72113from trac.wiki.macros import WikiMacroBase 
    73114 
    … …  
    87128    url = "$URL$" 
    88129 
    89     def expand_macro(self, formatter, name, args): 
     130    def expand_macro(self, formatter, name, text, args): 
    90131        """Return some output that will be displayed in the Wiki content. 
    91132 
    92133        `name` is the actual name of the macro (no surprise, here it'll be 
    93134        `'HelloWorld'`), 
    94         `args` is the text enclosed in parenthesis at the call of the macro. 
     135        `text` is the text enclosed in parenthesis at the call of the macro. 
    95136          Note that if there are ''no'' parenthesis (like in, e.g. 
    96           [[HelloWorld]]), then `args` is `None`. 
     137          [[HelloWorld]]), then `text` is `None`. 
     138        `args` are the arguments passed when HelloWorld is called using a 
     139        `#!HelloWorld` code block. 
    97140        """ 
    98         return 'Hello World, args = ' + unicode(args) 
    99      
    100     # Note that there's no need to HTML escape the returned data, 
    101     # as the template engine (Genshi) will do it for us. 
     141        return 'Hello World, text = %s, args = %s' % \ 
     142            (Markup.escape(text), Markup.escape(repr(args))) 
     143 
    102144}}} 
    103145 
     146Note 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''). 
    104147 
    105 === {{{expand_macro}}} details === 
    106 {{{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}}}. 
     148For example, when writing: 
     149{{{ 
     150{{{#!HelloWorld style="polite" 
     151<Hello World!> 
     152}}} 
    107153 
    108 If your macro creates wiki markup instead of HTML, you can convert it to HTML like this: 
     154{{{#!HelloWorld 
     155<Hello World!> 
     156}}} 
     157 
     158[[HelloWorld(<Hello World!>)]] 
     159}}} 
     160One should get: 
     161{{{ 
     162Hello World, text = <Hello World!> , args = {'style': u'polite'} 
     163Hello World, text = <Hello World!> , args = {} 
     164Hello World, text = <Hello World!> , args = None 
     165}}} 
     166 
     167Note 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`).   
     168 
     169You can also recursively use a wiki Formatter (`from trac.wiki import Formatter`) to process the `text` as wiki markup, for example by doing: 
    109170 
    110171{{{ 
    111172#!python 
    112   text = "whatever wiki markup you want, even containing other macros" 
    113   # Convert Wiki markup to HTML, new style 
    114   out = StringIO() 
    115   Formatter(self.env, formatter.context).format(text, out) 
    116   return Markup(out.getvalue()) 
     173from genshi.core import Markup 
     174from trac.wiki.macros import WikiMacroBase 
     175from trac.wiki import Formatter 
     176import StringIO 
     177 
     178class HelloWorldMacro(WikiMacroBase): 
     179        def expand_macro(self, formatter, name, text, args): 
     180                text = "whatever '''wiki''' markup you want, even containing other macros" 
     181                # Convert Wiki markup to HTML, new style 
     182                out = StringIO.StringIO() 
     183                Formatter(self.env, formatter.context).format(text, out) 
     184                return Markup(out.getvalue()) 
    117185}}}