mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-09 03:19:56 +00:00
47 lines
2.2 KiB
Plaintext
47 lines
2.2 KiB
Plaintext
|
created: 20150220181617000
|
||
|
|
modified: 20150221221642000
|
||
|
|
tags: WikiText
|
||
|
|
title: Macro Definitions in WikiText
|
||
|
|
type: text/vnd.tiddlywiki
|
||
|
|
caption: Macro Definitions
|
||
|
|
|
||
|
|
A [[macro|Macros]] is defined using a `\define` [[pragma|Pragma]]. Like any pragma, this can only appear at the start of a tiddler.
|
||
|
|
|
||
|
|
The first line of the definition specifies the macro name and any parameters. Each parameter has a name, and optionally a default value that is used if no value is supplied on a particular call to the macro. The lines that follow contain the macro's text (i.e. the snippet represented by the macro name), until `\end` appears on a line by itself:
|
||
|
|
|
||
|
|
<$codeblock code={{$:/editions/tw5.com/macro-examples/say-hi}}/>
|
||
|
|
|
||
|
|
Alternatively, the entire definition can be presented on a single line, without an `\end` marker:
|
||
|
|
|
||
|
|
```
|
||
|
|
\define sayhi(name:"Bugs Bunny") Hi, I'm $name$.
|
||
|
|
```
|
||
|
|
|
||
|
|
A more formal [[presentation|Macro Definition Syntax]] of this syntax is also available.
|
||
|
|
|
||
|
|
!! Placeholders
|
||
|
|
|
||
|
|
The snippet can contain placeholders for parameters. These consist of a parameter name between dollar signs, like `$this$`.
|
||
|
|
|
||
|
|
It can also contain placeholders for [[variables|Variables]]. These consist of a variable name (or macro name) between dollar signs and round brackets, like `$(this)$`.
|
||
|
|
|
||
|
|
The actual value of the parameter or variable is substituted for the placeholder whenever the macro is called:
|
||
|
|
|
||
|
|
<$importvariables filter="$:/editions/tw5.com/macro-examples/say-hi-using-variables">
|
||
|
|
<$codeblock code={{$:/editions/tw5.com/macro-examples/say-hi-using-variables}}/>
|
||
|
|
<$macrocall $name=".example" n="1"
|
||
|
|
eg="""<$set name="address" value="Rabbit Hole Hill">
|
||
|
|
<<say-hi-using-variables>>
|
||
|
|
</$set>"""/>
|
||
|
|
</$importvariables>
|
||
|
|
|
||
|
|
!! Scope
|
||
|
|
|
||
|
|
Macros are available to the tiddler that defines them, plus any tiddlers that it transcludes.
|
||
|
|
|
||
|
|
To make a macro available to all tiddlers, define it in a tiddler that has the tag <<.tag $:/tags/Macro>>.
|
||
|
|
|
||
|
|
It is also possible to write a macro as a [[JavaScript module|http://tiddlywiki.com/dev/index.html#JavaScript%20Macros]]. ~JavaScript macros are available to all tiddlers, and offer the maximum flexibility.
|
||
|
|
|
||
|
|
A tiddler can manually import macro definitions from a [[selection|Title Selection]] of other tiddlers by using the <<.wlink ImportVariablesWidget>> widget.
|