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Docs updates

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jeremy@jermolene.com 2022-10-07 16:56:21 +01:00
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created: 20221007144237585
modified: 20221007145934733
tags: Concepts Reference
title: Custom Widgets
type: text/vnd.tiddlywiki
!! Introduction
A <<.def "custom widget">> is a special kind of [[procedure|Procedures]] that can be called using the same syntax as widgets.
Custom widgets can also be used to override built-in JavaScript widgets to customise their behaviour.
!! Defining Custom Widgets
Custom widgets are usually defined with the [[Pragma: \widget]]:
```
\widget $$my-widget(attribute:"Default value")
This is the widget, and the attribute is <<attribute>>.
\end
```
The name of the widget must start with one or two dollar signs:
* A ''single dollar sign'' is used to override existing core widgets
** for example, `$text` or `$codeblock`
* ''Double dollar signs'' are used to define a custom widget
** for example, `$$mywidget` or `$$acme-logger`
The <<.wlink "GenesisWidget">> widget For example:
!! Using Custom Widgets
The name wrapped in double angled [[brackets|Brackets]] is used a shorthand way of [[transcluding|Transclusion]] the snippet. Each of these <<.def "procedure calls">> can supply a different set of parameters:
```
<<my-procedure>>
<<my-procedure "The parameter">>
```
The parameters that are specified in the procedure call are made available as variables.
!! How Custom Widgets Work
Custom widgets are implemented as a special kind of [[variable|Variables]]. The only thing that distinguishes them from ordinary variables is the way that they can be called as a custom widget with attributes mapped to parameters.
!! Using Custom Widgets

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created: 20221007132845007
modified: 20221007133003128
tags: Pragmas
title: Pragma: \procedure
type: text/vnd.tiddlywiki
The ''\procedure'' [[pragma|Pragmas]] is used to [[define procedures|Procedure Definitions]]. It is a shortcut syntax for the SetVariableWidget.
The usual form allows procedures to span multiple lines:
```
\procedure <procedure-name>(<param-name>[:<param-default-value>],<param-name>[:<param-default-value>]...)
<multiple-line-definition-text>
\end
```
There is also a single line form for shorter procedures:
```
\define <procedure-name>(<param-name>[:<param-default-value>],<param-name>[:<param-default-value>]...) <single-line-definition-text>
```
The first line of the definition specifies the procedure 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 text of the procedure text (i.e. the snippet represented by the procedure name), until `\end` appears on a line by itself:
For example:
```
```
Alternatively, the entire definition can be presented on a single line without an `\end` marker:
```
\define sayhi(name:"Bugs Bunny") Hi, I'm $name$.
```

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caption: Macro Calls
created: 20221007130006705
modified: 20221007130607159
tags: WikiText Procedures
title: Procedure Calls
type: text/vnd.tiddlywiki
!! Introduction
This tiddler describes the different ways in which [[macros|Procedures]] can be called.
!! Procedure Call Transclusion Shortcut
To call a [[procedure|Procedures]], place `<<`double angle brackets`>>` around the name and any parameter values.
```
<<my-procedure param:"This is the parameter value">>
```
By default, parameters are listed in the same order as in the procedure definition. A parameter can be labelled with its name and a colon to allow them to be listed in a different order.
If no value is specified for a parameter, the default value given for that parameter in the [[procedure definition|Procedure Definitions]] is used instead. (If no default value was defined, the parameter is blank).
Each parameter value can be enclosed in `'`single quotes`'`, `"`double quotes`"`, `"""`triple double quotes`"""` or `[[`double square brackets`]]`. Triple double quotes allow a value to contain almost anything. If a value contains no spaces or single or double quotes, it requires no delimiters.
See the discussion about [[parser modes|WikiText parser mode: macro examples]]
!! Procedure Calls with <<.wlink TranscludeWidget>> Widget
The shortcut syntax expands to the <<.wlink TranscludeWidget>> widget with the `$variable` attribute specifying the name of the procedure to transclude.
```
<$transclude $variable="my-procedure" param="This is the parameter value"/>
```
The widget itself offers greater flexibility than the shortcut syntax, including the ability to specify dynamic parameter values.
!! Assigning Procedure Calls to Attribute Values
The text of a procedure can be directly assigned to an attribute of a widget or HTML element. The result of the procedure is not wikified, which means that [[parameter handling|Procedure Parameter Handling]] does not take place.
```
<div class=<<myclasses>>>
...
</div>
```
!! Using Procedure Calls in Filters
Procedure calls can be used in filters. The text is not wikified which again means that the parameters will be ignored.
```
<$list filter="[<my-procedure>]">
...
</$list>
```

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caption: Macro Definitions
created: 20221007125701001
modified: 20221007130618079
tags: WikiText Procedures
title: Procedure Definitions
type: text/vnd.tiddlywiki
!! Introduction
This tiddler describes the different ways in which [[macros|Procedures]] can be defined.
!! Procedure Definition Pragma
Macros are created using the [[Pragma: \procedure]] at the start of a tiddler. The definitions are available in the rest of the tiddler that defines them, plus any tiddlers that it transcludes.
```
\define my-procedure(param)
This is the macro text (param=<<param>>)
\end
```
!! Procedure Definition with Set Widget
Procedures are implemented as a special kind of [[variable|Variables]] and so internally are actually defined with a <<.wlink SetWidget>> widget.
```
<$set name="my-procedure" value="This is the procedure text">
...
</$set>
```
<<.note """that it is not currently possible to specify parameters when defining a procedure with the <<.wlink SetWidget>> widget.""">>
!! Importing Procedure Definitions
The [[Pragma: \import]] or <<.wlink ImportVariablesWidget>> widget can be used to copy procedure definitions from another tiddler.
!! `$:/tags/Macro` Tag
Global procedures can be defined using the [[SystemTag: $:/tags/Macro]].
The tag [[SystemTag: $:/tags/Macro/View]] is used to define procedures that should only be available within the main view template and the preview panel.
The tag [[SystemTag: $:/tags/Macro/View/Body]] is used to define procedures that should only be available within the main view template body and the preview panel.

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caption: Macro Definitions
created: 20221007130538285
modified: 20221007130953725
tags: WikiText Procedures
title: Procedure Parameter Handling
type: text/vnd.tiddlywiki
!! Introduction
[[Procedure|Procedures]] parameters are made available as variables when the procedure contents are wikified.
!! Accessing Parameters as Variables
When procedures are wikified, the parameters can be accessed as variables.
For example:
<$macrocall $name="wikitext-example-without-html" src="""\procedure say-hi(name,address)
Hi, I'm <<name>> and I live in <<address>>.
\end
<<say-hi name:"Bugs" address:"Rabbit Hole Hill">>
"""/>
Accessing parameters as variables only works in procedures that are wikified and not, for example, when a procedure is used as an attribute value.

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created: 20221007124007426
modified: 20221007144806995
tags: Concepts Reference
title: Procedures
type: text/vnd.tiddlywiki
!! Introduction
A <<.def procedure>> is a named snippet of text. They are typically defined with the [[Pragma: \procedure]]:
```
\procedure my-procedure(parameter:"Default value")
This is the procedure, and the parameter is <<parameter>>.
\end
```
The name wrapped in double angled [[brackets|Brackets]] is used a shorthand way of [[transcluding|Transclusion]] the snippet. Each of these <<.def "procedure calls">> can supply a different set of parameters:
```
<<my-procedure>>
<<my-procedure "The parameter">>
```
The parameters that are specified in the procedure call are made available as variables.
!! How Procedures Work
Procedures are implemented as a special kind of [[variable|Variables]]. The only thing that distinguishes them from ordinary variables is the way that the parameters are handled.
!! Using Procedures
* [[Procedure Definitions]] describes how to create procedures
* [[Procedure Calls]] describes how to use procedures
* [[Procedure Parameter Handling]] describes how procedure parameters work

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created: 20140211171341271
modified: 20220917154956636
modified: 20221007144757675
tags: Concepts Reference
title: Macros
type: text/vnd.tiddlywiki
!! Introduction
A <<.def macro>> is a named snippet of text. It is typically defined with the [[Pragma: \define]]:
A <<.def macro>> is a named snippet of text. They are typically defined with the [[Pragma: \define]]:
```
\define my-macro(parameter:"Default value")
@ -26,11 +26,11 @@ The parameters that are specified in the macro call are substituted for special
* `$parameter-name$` is replaced with the value of the named parameter
* `$(variable-name)$` is replaced with the value of the named [[variable|Variables]]).
<<.from-version "5.3.0">> Macros have been superseded by [[Procedures]], [[Custom Widgets]] and [[Functions]] which together provide more robust and flexible ways to encapsulate and re-use code. It is now recommended to only use macros when textual substitution is specifically required.
<<.from-version "5.3.0">> Macros have been [[superseded|Macro Pitfalls]] by [[Procedures]], [[Custom Widgets]] and [[Functions]] which together provide more robust and flexible ways to encapsulate and re-use code. It is now recommended to only use macros when textual substitution is specifically required.
!! How Macros Work
Macros are implemented as a special type of [[variable|Variables]]. The only thing that distinguishes them from ordinary variables is the way that the parameters are handled.
Macros are implemented as a special kind of [[variable|Variables]]. The only thing that distinguishes them from ordinary variables is the way that the parameters are handled.
!! Using Macros

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caption: macrocall
created: 20131024141900000
modified: 20220909111836951
tags: Widgets
modified: 20221007121724264
tags: Widgets $:/deprecated
title: MacroCallWidget
type: text/vnd.tiddlywiki
<<.from-version "5.3.0">> The <<.wlink MacroCallWidget>> widget is now deprecated. While it will continue to work, users are advised to use the <<.wlink TranscludeWidget>> widget, converting the `$name` attribute to `$variable`.
<<.deprecated-since "5.3.0" "TranscludeWidget">>
The <<.wlink MacroCallWidget>> widget is deprecated. While it will continue to work, users are now advised to use the <<.wlink TranscludeWidget>> widget, converting the `$name` attribute to `$variable`.
For example,

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caption: transclude
created: 20130824142500000
modified: 20220917113915710
modified: 20221007123821494
tags: Widgets
title: TranscludeWidget
type: text/vnd.tiddlywiki
@ -87,7 +87,7 @@ There are several different ways to declare parameters within a transclusion:
* the <<.wlink ParametersWidget>> widget
* the [[Pragma: \parameters]]
* the [[Pragma: \procedure]] for declaring procedure
* the [[Pragma: \widgets]] for declaring custom widgets
* the [[Pragma: \widget]] for declaring custom widgets
* the [[Pragma: \define]] for declaring macros
An example of declaring parameters with the <<.wlink ParametersWidget>> widget:

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caption: Macro Calls
created: 20150220182252000
modified: 20220918115347941
modified: 20221007132734417
tags: WikiText Macros
title: Macro Calls
type: text/vnd.tiddlywiki
@ -25,7 +25,7 @@ Each parameter value can be enclosed in `'`single quotes`'`, `"`double quotes`"`
A more formal [[presentation|Macro Call Syntax]] of this syntax is also available.
See some [[examples|Macro Calls in WikiText (Examples)]] and discussion about [[parser modes|WikiText parser mode: macro examples]]
See some [[examples|Macro Calls in WikiText (Examples)]] and discussion about [[parser modes|WikiText parser mode: macro examples]].
!! Macro Calls with <<.wlink TranscludeWidget>> Widget