Changes between Version 4 and Version 5 of Wiki Macros


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Timestamp:
Jun 19, 2017, 10:42:06 PM (7 years ago)
Author:
trac
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  • Wiki Macros

    v4 v5  
    1 = Trac Macros =
     1= Trac Macros
    22
    3 [[PageOutline]]
     3[[PageOutline(2-5,Contents,pullout)]]
    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. Its syntax is `[[macro-name(optional-arguments)]]`.
     5'''Trac macros''' extend the Trac engine with custom functionality. Macros are a special type of plugin and are written in Python. A macro inserts dynamic HTML data in any context supporting WikiFormatting.
    66
    7 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.
     7The macro syntax is `[[macro-name(optional-arguments)]]`.
    88
    9 == Using Macros ==
     9'''WikiProcessors''' are another kind of macros. They are typically used for source code highlighting, such as `!#python` or `!#apache` and when the source code spans multiple lines, such as:
    1010
    11 Macro calls are enclosed in two ''square brackets''. Like Python functions, macros can also have arguments, a comma separated list within parentheses.
     11{{{
     12{{{#!wiki-processor-name
     13...
     14}}}
     15}}}
    1216
    13 === Getting Detailed Help ===
     17== Using Macros
     18
     19Macro calls are enclosed in double-square brackets `[[..]]`. Like Python functions, macros can have arguments, which is then a comma separated list within parentheses `[[..(,)]]`.
     20
     21=== Getting Detailed Help
     22
    1423The list of available macros and the full help can be obtained using the !MacroList macro, as seen [#AvailableMacros below].
    1524
    … …  
    1827Detailed 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?]]`.
    1928
     29=== Example
    2030
    21 
    22 === Example ===
    23 
    24 A list of 3 most recently changed wiki pages starting with 'Trac':
     31A list of the 3 most recently changed wiki pages starting with 'Trac':
    2532
    2633||= Wiki Markup =||= Display =||
    … …  
    5057{{{#!td style="padding-left: 2em"
    5158{{{#!html
    52 <div style="font-size: 80%" class="trac-macrolist">
     59<div class="trac-macrolist">
    5360<h3><code>[[Image]]</code></h3>Embed an image in wiki-formatted text.
    5461
    55 The first argument is the file …
     62The first argument is the file, as in <code>[[Image(filename.png)]]</code>
    5663<h3><code>[[InterTrac]]</code></h3>Provide a list of known <a class="wiki" href="/wiki/InterTrac">InterTrac</a> prefixes.
    5764<h3><code>[[InterWiki]]</code></h3>Provide a description list for the known <a class="wiki" href="/wiki/InterWiki">InterWiki</a> prefixes.
    5865<h3><code>[[KnownMimeTypes]]</code></h3>List all known mime-types which can be used as <a class="wiki" href="/wiki/WikiProcessors">WikiProcessors</a>.
    59 Can be …</div>
     66</div>
    6067}}}
    6168etc.
    6269}}}
    6370
    64 == Available Macros ==
     71== Available Macros
    6572
    6673''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].''
    … …  
    6875[[MacroList]]
    6976
    70 == Macros from around the world ==
     77== Macros from around the world
    7178
    72 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.
     79The [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 are looking for new macros, or have written one that you would like to share, please visit that site.
    7380
    74 == Developing Custom Macros ==
     81== Developing Custom Macros
     82
    7583Macros, like Trac itself, are written in the [http://python.org/ Python programming language] and are developed as part of TracPlugins.
    7684
    7785For more information about developing macros, see the [trac:TracDev development resources] on the main project site.
    7886
     87Here are 2 simple examples showing how to create a Macro. Also, have a look at [trac:source:tags/trac-1.0.2/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 more insight about the transition.
    7988
    80 Here are 2 simple examples showing how to create a Macro with Trac 0.11.
     89=== Macro without arguments
    8190
    82 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.
     91To test the following code, save it in a `timestamp_sample.py` file located in the TracEnvironment's `plugins/` directory.
    8392
    84 === Macro without arguments ===
    85 To test the following code, you should saved it in a `timestamp_sample.py` file located in the TracEnvironment's `plugins/` directory.
    86 {{{
    87 #!python
     93{{{#!python
    8894from datetime import datetime
    8995# Note: since Trac 0.11, datetime objects are used internally
    … …  
    105111}}}
    106112
    107 === Macro with arguments ===
    108 To test the following code, you should saved it in a `helloworld_sample.py` file located in the TracEnvironment's `plugins/` directory.
    109 {{{
    110 #!python
     113=== Macro with arguments
     114
     115To test the following code, save it in a `helloworld_sample.py` file located in the TracEnvironment's `plugins/` directory.
     116
     117{{{#!python
    111118from genshi.core import Markup
    112119
    … …  
    144151}}}
    145152
    146 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'').
     153Note 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. In the other case, when called as a macro, `args` is `None`. (''since 0.12'').
    147154
    148155For example, when writing:
    … …  
    158165[[HelloWorld(<Hello World!>)]]
    159166}}}
     167
    160168One should get:
    161169{{{
    162 Hello World, text = <Hello World!> , args = {'style': u'polite', 'silent': False, 'verbose': True}
    163 Hello World, text = <Hello World!> , args = {}
    164 Hello World, text = <Hello World!> , args = None
     170Hello World, text = <Hello World!>, args = {'style': u'polite', 'silent': False, 'verbose': True}
     171Hello World, text = <Hello World!>, args = {}
     172Hello World, text = <Hello World!>, args = None
    165173}}}
    166174
    167 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`). 
     175Note 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)`) with `Markup` coming from Genshi (`from genshi.core import Markup`).
    168176
    169 You can also recursively use a wiki Formatter (`from trac.wiki import Formatter`) to process the `text` as wiki markup, for example by doing:
     177You can also recursively use a wiki Formatter (`from trac.wiki import Formatter`) to process the `text` as wiki markup:
    170178
    171 {{{
    172 #!python
     179{{{#!python
    173180from genshi.core import Markup
    174181from trac.wiki.macros import WikiMacroBase
    … …  
    177184
    178185class 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())
     186    def expand_macro(self, formatter, name, text, args):
     187        text = "whatever '''wiki''' markup you want, even containing other macros"
     188        # Convert Wiki markup to HTML, new style
     189        out = StringIO.StringIO()
     190        Formatter(self.env, formatter.context).format(text, out)
     191        return Markup(out.getvalue())
    185192}}}