Changes between Version 1 and Version 2 of WikiMacros
- Timestamp:
- 06/10/10 13:36:27 (15 years ago)
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WikiMacros
v1 v2 1 = Wiki Macros = 1 = Trac Macros = 2 3 [[PageOutline]] 4 2 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. 3 6 … … 5 8 6 9 == Using Macros == 7 Macro calls are enclosed in two ''square brackets''. Like Python functions, macros can also have arguments, a comma separated list within parentheses. 10 Macro calls are enclosed in two ''square brackets''. Like Python functions, macros can also have arguments, a comma separated list within parentheses. 8 11 9 === Examples === 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. 13 14 === Example === 15 16 A list of 3 most recently changed wiki pages starting with 'Trac': 10 17 11 18 {{{ 12 [[ Timestamp]]19 [[RecentChanges(Trac,3)]] 13 20 }}} 21 14 22 Display: 15 [[Timestamp]] 16 17 {{{ 18 [[HelloWorld(Testing)]] 19 }}} 20 Display: 21 [[HelloWorld(Testing)]] 23 [[RecentChanges(Trac,3)]] 22 24 23 25 == Available Macros == … … 32 34 33 35 == Developing Custom Macros == 34 Macros, like Trac itself, are written in the [http:// www.python.org/ Python programming language]. They are very simple modules, identified by the filename and should contain a single `execute()` function. Trac will display the returned data inserted into the HTML representation of the Wiki page where the macro is called.36 Macros, like Trac itself, are written in the [http://python.org/ Python programming language]. 35 37 36 It's easiest to learn from an example: 38 For more information about developing macros, see the [trac:TracDev development resources] on the main project site. 39 40 41 == Implementation == 42 43 Here are 2 simple examples showing how to create a Macro with Trac 0.11. 44 45 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. 46 47 === Macro without arguments === 48 It should be saved as `TimeStamp.py` (in the TracEnvironment's `plugins/` directory) as Trac will use the module name as the Macro name. 37 49 {{{ 38 50 #!python 39 # MyMacro.py -- The world's simplest macro 51 from datetime import datetime 52 # Note: since Trac 0.11, datetime objects are used internally 40 53 41 def execute(hdf, args, env): 42 return "Hello World called with args: %s" % args 54 from genshi.builder import tag 55 56 from trac.util.datefmt import format_datetime, utc 57 from trac.wiki.macros import WikiMacroBase 58 59 class TimeStampMacro(WikiMacroBase): 60 """Inserts the current time (in seconds) into the wiki page.""" 61 62 revision = "$Rev$" 63 url = "$URL$" 64 65 def expand_macro(self, formatter, name, args): 66 t = datetime.now(utc) 67 return tag.b(format_datetime(t, '%c')) 43 68 }}} 44 69 45 You can also use the environment (`env`) object, for example to access configuration data and the database, for example: 70 === Macro with arguments === 71 It should be saved as `HelloWorld.py` (in the TracEnvironment's `plugins/` directory) as Trac will use the module name as the Macro name. 46 72 {{{ 47 73 #!python 48 def execute(hdf, txt, env): 49 return env.config.get('trac', 'repository_dir') 74 from trac.wiki.macros import WikiMacroBase 75 76 class HelloWorldMacro(WikiMacroBase): 77 """Simple HelloWorld macro. 78 79 Note that the name of the class is meaningful: 80 - it must end with "Macro" 81 - what comes before "Macro" ends up being the macro name 82 83 The documentation of the class (i.e. what you're reading) 84 will become the documentation of the macro, as shown by 85 the !MacroList macro (usually used in the WikiMacros page). 86 """ 87 88 revision = "$Rev$" 89 url = "$URL$" 90 91 def expand_macro(self, formatter, name, args): 92 """Return some output that will be displayed in the Wiki content. 93 94 `name` is the actual name of the macro (no surprise, here it'll be 95 `'HelloWorld'`), 96 `args` is the text enclosed in parenthesis at the call of the macro. 97 Note that if there are ''no'' parenthesis (like in, e.g. 98 [[HelloWorld]]), then `args` is `None`. 99 """ 100 return 'Hello World, args = ' + unicode(args) 101 102 # Note that there's no need to HTML escape the returned data, 103 # as the template engine (Genshi) will do it for us. 50 104 }}} 51 105 52 Note that since version 0.9, wiki macros can also be written as TracPlugins. This gives them some capabilities that “classic” macros do not have, such as being able to directly access the HTTP request.53 106 54 For more information about developing macros, see the [http://projects.edgewall.com/trac/wiki/TracDev development resources] on the main project site. 107 === {{{expand_macro}}} details === 108 {{{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}}}. 55 109 56 ---- 57 See also: WikiProcessors, WikiFormatting, TracGuide 110 If your macro creates wiki markup instead of HTML, you can convert it to HTML like this: 111 112 {{{ 113 #!python 114 text = "whatever wiki markup you want, even containing other macros" 115 # Convert Wiki markup to HTML, new style 116 out = StringIO() 117 Formatter(self.env, formatter.context).format(text, out) 118 return Markup(out.getvalue()) 119 }}}