71 lines
2.5 KiB
Markdown
71 lines
2.5 KiB
Markdown
---
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type: plug
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repo: https://github.com/silverbulletmd/silverbullet
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---
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The directive plug is a built-in plug implementing various so-called “directive” that all take the form of `<!-- #directiveName ... -->` and close with `<!-- /directiveName -->`. Currently the following directives are supported:
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* `#query` to perform queries: [[🔌 Directive/Query]]
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* `#include` to inline the content of another page verbatim: [[@include]]
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* `#use` to use the content of another as a [handlebars](https://handlebarsjs.com/) template: [[@use]]
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* `#eval` to evaluate an arbitrary JavaScript expression and inline the result: [[@eval]]
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## Include
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$include
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The `#include` directive can be used to embed another page into your existing one. The syntax is as follows:
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<!-- #include [[page reference]] -->
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<!-- /include -->
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Whenever the directives are updated, the body of the directive will be replaced with the latest version of the reference page.
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## Use
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$use
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The `#use` directive can be used to use a referenced page as a handbars template. Optionally, a JSON object can be passed as argument to the template:
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<!-- #use [[template/plug]] {"name": "🔌 Directive", "repo": "https://google.com", "author": "Pete"} -->
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<!-- /use -->
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which renders as follows:
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<!-- #use [[template/plug]] {"name": "🔌 Directive", "repo": "https://google.com", "author": "Pete"} -->
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* [[🔌 Directive]] by **Pete** ([repo](https://google.com))
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<!-- /use -->
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Note that a string is also a valid JSON value:
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* [ ] #test This is a test task
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So, a template can take, for instance a tag name as an argument:
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<!-- #use [[template/tagged-tasks]] "test" -->
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* [ ] [[🔌 Directive@1537]] This is a test task #test
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<!-- /use -->
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## Eval
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$eval
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The `#eval` directive can be used to evaluate arbitrary JavaScript expressions. It’s also possible to invoke arbitrary plug functions this way.
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A simple example is multiplying numbers:
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<!-- #eval 10 * 10 -->
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100
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<!-- /eval -->
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However, you can also invoke arbitrary plug functions, e.g. the `titleUnfurlOptions` function in the `core` plug:
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<!-- #eval core.titleUnfurlOptions() -->
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|id |name |
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|------------|-------------|
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|title-unfurl|Extract title|
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<!-- /eval -->
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Optionally, you can use a `render` clause to render the result as a template, similar to [[🔌 Directive/Query]]:
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<!-- #eval core.titleUnfurlOptions() render [[template/debug]] -->
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id: title-unfurl
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name: Extract title
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---
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<!-- /eval --> |