Changes between Version 5 and Version 6 of Wiki Macros


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Timestamp:
Aug 19, 2021, 11:03:25 PM (3 years ago)
Author:
trac
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  • Wiki Macros

    v5 v6  
    33[[PageOutline(2-5,Contents,pullout)]]
    44
    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.
     5'''Trac macros''' extend Trac with custom functionality. Macros are a special type of plugin and are written in Python. A macro generates HTML in any context supporting WikiFormatting.
    66
    77The macro syntax is `[[macro-name(optional-arguments)]]`.
    88
    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:
     9'''WikiProcessors''' are another kind of macro, commonly used for source code highlighting using a processor like `!#python` or `!#apache`:
    1010
    1111{{{
    1212{{{#!wiki-processor-name
    13 ... 
     13...
    1414}}}
    1515}}}
    … …  
    1717== Using Macros
    1818
    19 Macro 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 
    23 The list of available macros and the full help can be obtained using the !MacroList macro, as seen [#AvailableMacros below].
    24 
    25 A brief list can be obtained via `[[MacroList(*)]]` or `[[?]]`.
    26 
    27 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?]]`.
    28 
    29 === Example
    30 
    31 A list of the 3 most recently changed wiki pages starting with 'Trac':
     19Macro calls are enclosed in double-square brackets `[[..]]`. Like Python functions macros can have arguments, which take the form of a comma separated list within parentheses `[[..(,)]]`. A common macro used is a list of the 3 most recent changes to a wiki page, or here, for example, all wiki pages starting with 'Trac':
    3220
    3321||= Wiki Markup =||= Display =||
    … …  
    4028[[RecentChanges(Trac,3)]]
    4129}}}
    42 |-----------------------------------
    43 {{{#!td
    44   {{{
    45   [[RecentChanges?(Trac,3)]]
    46   }}}
    47 }}}
    48 {{{#!td style="padding-left: 2em;"
    49 [[RecentChanges?(Trac,3)]]
    50 }}}
    51 |-----------------------------------
    52 {{{#!td
    53   {{{
    54   [[?]]
    55   }}}
    56 }}}
    57 {{{#!td style="padding-left: 2em"
    58 {{{#!html
    59 <div class="trac-macrolist">
    60 <h3><code>[[Image]]</code></h3>Embed an image in wiki-formatted text.
    6130
    62 The first argument is the file, as in <code>[[Image(filename.png)]]</code>
    63 <h3><code>[[InterTrac]]</code></h3>Provide a list of known <a class="wiki" href="/wiki/InterTrac">InterTrac</a> prefixes.
    64 <h3><code>[[InterWiki]]</code></h3>Provide a description list for the known <a class="wiki" href="/wiki/InterWiki">InterWiki</a> prefixes.
    65 <h3><code>[[KnownMimeTypes]]</code></h3>List all known mime-types which can be used as <a class="wiki" href="/wiki/WikiProcessors">WikiProcessors</a>.
    66 </div>
    67 }}}
    68 etc.
    69 }}}
     31=== Getting Detailed Help
     32
     33The list of available macros and the full help can be obtained using the !MacroList macro, see [#AvailableMacros below].
     34
     35A brief list can be obtained via `[[MacroList(*)]]` or `[[?]]`.
     36
     37Detailed 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?]]`.
    7038
    7139== Available Macros
    7240
    73 ''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].''
    74 
    7541[[MacroList]]
    7642
    77 == Macros from around the world
     43== Contributed macros
    7844
    79 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.
     45The [https://trac-hacks.org/ Trac Hacks] site provides a large 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.
    8046
    8147== Developing Custom Macros
    8248
    83 Macros, like Trac itself, are written in the [http://python.org/ Python programming language] and are developed as part of TracPlugins.
     49Macros, like Trac itself, are written in the [https://python.org/ Python programming language] and are a type of [TracPlugins plugin].
    8450
    85 For more information about developing macros, see the [trac:TracDev development resources] on the main project site.
    86 
    87 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.
     51Here are 2 simple examples showing how to create a Macro. For more information about developing macros, see the [trac:TracDev development resources] and [trac:browser:branches/1.4-stable/sample-plugins sample-plugins].
    8852
    8953=== Macro without arguments
    9054
    91 To test the following code, save it in a `timestamp_sample.py` file located in the TracEnvironment's `plugins/` directory.
     55To test the following code, copy it to `timestamp_sample.py` in the TracEnvironment's `plugins/` directory.
    9256
    9357{{{#!python
    94 from datetime import datetime
    95 # Note: since Trac 0.11, datetime objects are used internally
    96 
    97 from genshi.builder import tag
    98 
    99 from trac.util.datefmt import format_datetime, utc
     58from trac.util.datefmt import datetime_now, format_datetime, utc
     59from trac.util.html import tag
    10060from trac.wiki.macros import WikiMacroBase
    10161
    102 class TimeStampMacro(WikiMacroBase):
    103     """Inserts the current time (in seconds) into the wiki page."""
     62class TimestampMacro(WikiMacroBase):
     63    _description = "Inserts the current time (in seconds) into the wiki page."
    10464
    105     revision = "$Rev$"
    106     url = "$URL$"
    107 
    108     def expand_macro(self, formatter, name, text):
    109         t = datetime.now(utc)
     65    def expand_macro(self, formatter, name, content, args=None):
     66        t = datetime_now(utc)
    11067        return tag.strong(format_datetime(t, '%c'))
    11168}}}
    … …  
    11370=== Macro with arguments
    11471
    115 To test the following code, save it in a `helloworld_sample.py` file located in the TracEnvironment's `plugins/` directory.
     72To test the following code, copy it to `helloworld_sample.py` in the TracEnvironment's `plugins/` directory.
    11673
    11774{{{#!python
    118 from genshi.core import Markup
    119 
     75from trac.util.translation import cleandoc_
    12076from trac.wiki.macros import WikiMacroBase
    12177
    12278class HelloWorldMacro(WikiMacroBase):
     79    _description = cleandoc_(
    12380    """Simple HelloWorld macro.
    12481
    … …  
    13087    will become the documentation of the macro, as shown by
    13188    the !MacroList macro (usually used in the WikiMacros page).
    132     """
     89    """)
    13390
    134     revision = "$Rev$"
    135     url = "$URL$"
    136 
    137     def expand_macro(self, formatter, name, text, args):
     91    def expand_macro(self, formatter, name, content, args=None):
    13892        """Return some output that will be displayed in the Wiki content.
    13993
    14094        `name` is the actual name of the macro (no surprise, here it'll be
    14195        `'HelloWorld'`),
    142         `text` is the text enclosed in parenthesis at the call of the macro.
    143           Note that if there are ''no'' parenthesis (like in, e.g.
    144           [[HelloWorld]]), then `text` is `None`.
    145         `args` are the arguments passed when HelloWorld is called using a
    146         `#!HelloWorld` code block.
     96        `content` is the text enclosed in parenthesis at the call of the
     97          macro. Note that if there are ''no'' parenthesis (like in, e.g.
     98          [[HelloWorld]]), then `content` is `None`.
     99        `args` will contain a dictionary of arguments when called using the
     100          Wiki processor syntax and will be `None` if called using the
     101          macro syntax.
    147102        """
    148         return 'Hello World, text = %s, args = %s' % \
    149             (Markup.escape(text), Markup.escape(repr(args)))
    150 
     103        return 'Hello World, content = ' + unicode(content)
    151104}}}
    152105
    153 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'').
     106Note 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. When called as a macro, `args` is `None`.
    154107
    155108For example, when writing:
    … …  
    173126}}}
    174127
    175 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`).
     128Note 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)` (`from trac.util.html import Markup`).
    176129
    177 You can also recursively use a wiki Formatter (`from trac.wiki import Formatter`) to process the `text` as wiki markup:
     130You can also recursively use a wiki formatter to process the `content` as wiki markup:
    178131
    179132{{{#!python
    180 from genshi.core import Markup
     133from trac.wiki.formatter import format_to_html
    181134from trac.wiki.macros import WikiMacroBase
    182 from trac.wiki import Formatter
    183 import StringIO
    184135
    185136class HelloWorldMacro(WikiMacroBase):
    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())
     137    def expand_macro(self, formatter, name, content, args):
     138        content = "any '''wiki''' markup you want, even containing other macros"
     139        # Convert Wiki markup to HTML
     140        return format_to_html(self.env, formatter.context, content)
    192141}}}