TiddlyWiki5/editions/test/tiddlers/tests/data/globals/CustomWidget.tid

title: Globals/CustomWidget
description: Global shadow variable defining a custom widget
type: text/vnd.tiddlywiki-multiple
tags: [[$:/tags/wiki-test-spec]]

title: Output

\whitespace trim

<$$mywidget foo="Mahogany">
Sycamore!
</$$mywidget>
+
title: $:/global/$$mywidget
is-widget: yes
parameters: (foo:"bar")

Koala! <$text text=<<foo>>/>, <$slot $name="ts-body"/>
+
title: ExpectedResult

<p>Koala! Mahogany, Sycamore!</p>
Introduce true global variables The basic idea is that if we don't find a variable `foo` then we fallback to retrieving the value from the tiddler `$:/global/foo`, if it exists. This allows us to replace the usual importvariables-based mechanism for global definitions, avoiding cluttering up the variable namespace with every macro. In order to permit subprocedures to be overridden, we also introduce a mechanism for conditional definitions: preceding the word definition\|procedure\|function\|widget with a + causes the definition only to occur if the specified variable doesn't already exist. In the next commit we'll apply this mechanism to the tabs macro 2022-05-28 11:23:50 +00:00			`title: Globals/CustomWidget`
			`description: Global shadow variable defining a custom widget`
			`type: text/vnd.tiddlywiki-multiple`
			`tags: [[$:/tags/wiki-test-spec]]`

			`title: Output`

			`\whitespace trim`

			`<$$mywidget foo="Mahogany">`
			`Sycamore!`
			`</$$mywidget>`
			`+`
			`title: $:/global/$$mywidget`
			`is-widget: yes`
			`parameters: (foo:"bar")`

			`Koala! <$text text=<<foo>>/>, <$slot $name="ts-body"/>`
			`+`
			`title: ExpectedResult`

			`<p>Koala! Mahogany, Sycamore!</p>`