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50 lines
2.0 KiB
Plaintext
50 lines
2.0 KiB
Plaintext
caption: macrocall
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created: 20131024141900000
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modified: 20200928102843275
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tags: Widgets
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title: MacroCallWidget
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type: text/vnd.tiddlywiki
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! Introduction
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The macro call widget provides a more flexible alternative syntax for invoking macros compared to the usual `<<macroname>>` syntax documented in [[Macros in WikiText]].
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For example, a macro called `italicise` that takes a single parameter called `text` would usually be invoked like this:
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```
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<<italicise "Text to be made into italics">>
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<<italicise text:"Text to be made into italics">>
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```
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The same macro can be invoked using the macro call widget like this:
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```
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<$macrocall $name="italicise" text="Text to be made into italics"/>
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<$macrocall $name="italicise" text={{Title of tiddler containing text to be italicised}}/>
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<$macrocall $name="italicise" text=<<textMaker "Another macro to generate the text to be italicised">>/>
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```
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The advantages of the widget formulation are:
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* Macro parameters are specified as widget attributes, thus allowing indirection via `{{title!!field}}`, `<<macroname>>` or `{{{filter}}}`
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* The output format can be chosen from several options:
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** `text/html` wikifies the result of the macro
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** `text/plain` wikifies the result of the macro and then extracts the plain text characters (ie. ignoring HTML tags)
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** <<.from-version "5.1.23">> `text/raw` returns the result of the macro, without wikification
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You can see several examples of the macro call widget within the core:
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* Listing module information: [[$:/snippets/modules]]
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* Listing field information: [[$:/snippets/allfields]]
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* Generating `data:` URIs: [[$:/themes/tiddlywiki/starlight/styles.tid]]
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! Content and Attributes
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The content of the `<$macrocall>` widget is ignored.
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|!Attribute |!Description |
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|$name |Name of the macro to invoke |
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|$type |ContentType with which the macro text should be parsed (defaults to `text/vnd.tiddlywiki`) |
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|$output |ContentType for the output rendering (defaults to `text/html`, can also be `text/plain` or `text/raw`) |
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|//parameters// |Macro parameters specified as attributes |
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