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Changes between Version 2 and Version 3 of WikiMacros


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May 13, 2015, 11:55:11 PM (3 years ago)
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trac
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  • WikiMacros

    v2 v3  
    33[[PageOutline]]
    44
    5 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.
     5Trac 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)]]`.
    66
    7 Another kind of macros are WikiProcessors. They typically deal with alternate markup formats and representation of larger blocks of information (like source code highlighting).
     7The 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.
    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)
    65         return tag.b(format_datetime(t, '%c'))
     104        return tag.strong(format_datetime(t, '%c'))
    66105}}}
    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" -silent verbose
     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', 'silent': False, 'verbose': True}
     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}}}