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52 lines
1.8 KiB
Plaintext
52 lines
1.8 KiB
Plaintext
created: 20220917112233317
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modified: 20230419103154328
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tags: Pragmas
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title: Pragma: \define
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type: text/vnd.tiddlywiki
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The ''\define'' [[pragma|Pragmas]] is used to [[define macros|Macro Definitions]]. It is a shortcut syntax for the SetVariableWidget.
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The usual form allows macros to span multiple lines.
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```
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\define <macro-name>(<param-name>[:<param-default-value>],<param-name>[:<param-default-value>]...)
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<multiple-line-definition-text>
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\end [<macro-name>]
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```
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Note that the `\end` marker can optionally specify the name of the macro to which it relates which allows macro definitions to be nested.
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There is also a single line form for shorter macros:
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```
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\define <macro-name>(<param-name>[:<param-default-value>],<param-name>[:<param-default-value>]...) <single-line-definition-text>
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```
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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.
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The lines that follow contain the text of the macro text (i.e. the snippet represented by the macro name), until `\end` appears on a line by itself:
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<$codeblock code={{$:/editions/tw5.com/macro-examples/say-hi}}/>
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Alternatively, the entire definition can be presented on a single line without an `\end` marker:
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```
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\define sayhi(name:"Bugs Bunny") Hi, I'm $name$.
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```
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Macro definitions can be nested by specifying the name of the macro in the `\end` marker. For example:
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<<wikitext-example-without-html src:"""\define special-button(caption:"Click me")
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\define actions()
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<$action-sendmessage $message="tm-notify" $param="HelloThere"/>
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\end actions
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<$button actions=<<actions>>>
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$caption$
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</$button>
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\end special-button
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<<special-button>>
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""">>
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A more formal [[presentation|Macro Definition Syntax]] of this syntax is also available.
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