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authorRob Austein <sra@hactrn.net>2020-09-13 23:06:24 +0000
committerRob Austein <sra@hactrn.net>2020-09-13 23:06:24 +0000
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treef46c94ddfff34f15aafe7cac0596716d1c13c412 /raw-wiki-dump/WikiMacros
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-= Trac Macros
-
-[[PageOutline(2-5,Contents,pullout)]]
-
-'''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.
-
-The macro syntax is `[[macro-name(optional-arguments)]]`.
-
-'''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:
-
-{{{
-{{{#!wiki-processor-name
-...
-}}}
-}}}
-
-== Using Macros
-
-Macro calls are enclosed in double-square brackets `[[..]]`. Like Python functions, macros can have arguments, which is then a comma separated list within parentheses `[[..(,)]]`.
-
-=== 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 the 3 most recently changed wiki pages starting with 'Trac':
-
-||= 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 class="trac-macrolist">
-<h3><code>[[Image]]</code></h3>Embed an image in wiki-formatted text.
-
-The first argument is the file, as in <code>[[Image(filename.png)]]</code>
-<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>.
-</div>
-}}}
-etc.
-}}}
-
-== Available Macros
-
-''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].''
-
-[[MacroList]]
-
-== Macros from around the world
-
-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 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.
-
-For more information about developing macros, see the [trac:TracDev development resources] on the main project site.
-
-Here 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.
-
-=== Macro without arguments
-
-To test the following code, save 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
-from trac.wiki.macros import WikiMacroBase
-
-class TimeStampMacro(WikiMacroBase):
- """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)
- return tag.strong(format_datetime(t, '%c'))
-}}}
-
-=== Macro with arguments
-
-To test the following code, save 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
-
-class HelloWorldMacro(WikiMacroBase):
- """Simple HelloWorld macro.
-
- Note that the name of the class is meaningful:
- - it must end with "Macro"
- - what comes before "Macro" ends up being the macro name
-
- The documentation of the class (i.e. what you're reading)
- 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):
- """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.
- """
- 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 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'').
-
-For example, when writing:
-{{{
-{{{#!HelloWorld style="polite" -silent verbose
-<Hello World!>
-}}}
-
-{{{#!HelloWorld
-<Hello World!>
-}}}
-
-[[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
-}}}
-
-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)`) 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:
-
-{{{#!python
-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())
-}}} \ No newline at end of file