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

title: Globals/Functions
description: Global functions in shadow variables
type: text/vnd.tiddlywiki-multiple
tags: [[$:/tags/wiki-test-spec]]

title: Output

\whitespace trim

<$text text=<<this-is-one>>/>
|
<$text text=<<this-is-one 7>>/>
+
title: $:/global/this-is-one
_is_function: yes
_parameters: (foo:"2")

[<foo>multiply[2.5]]
+
title: ExpectedResult

<p>5|17.5</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 `$:/global/foo`, if it exists. This allows us to replace the usual importvariables-based mechanism for global definitions, avoiding cluttering up the variable namespace with every macro. In order to permit subprocedures to be overridden, we also introduce a mechanism for conditional definitions: preceding the word definition\|procedure\|function\|widget with a + causes the definition only to occur if the specified variable doesn't already exist. In the next commit we'll apply this mechanism to the tabs macro 2022-05-28 11:23:50 +00:00			`title: Globals/Functions`
			`description: Global functions in shadow variables`
			`type: text/vnd.tiddlywiki-multiple`
			`tags: [[$:/tags/wiki-test-spec]]`

			`title: Output`

			`\whitespace trim`

			`<$text text=<<this-is-one>>/>`
			`\|`
			`<$text text=<<this-is-one 7>>/>`
			`+`
			`title: $:/global/this-is-one`
Use underscores for new system fields for global variable tiddlers For consistency with `_canonical_uri`; unlike many system fields, the behaviour of these fields is baked into the core JS code. 2022-05-30 17:38:25 +00:00			`_is_function: yes`
			`_parameters: (foo:"2")`
Introduce true global variables The basic idea is that if we don't find a variable `foo` then we fallback to retrieving the value from the tiddler `$:/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
			`[<foo>multiply[2.5]]`
			`+`
			`title: ExpectedResult`

			`<p>5\|17.5</p>`