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https://github.com/Jermolene/TiddlyWiki5
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78 lines
3.7 KiB
Plaintext
78 lines
3.7 KiB
Plaintext
modified: 201305011454
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title: PluginMechanism
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tags: docs mechanism
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[[Plugins]] are bundles of tiddlers that are distributed and managed as a single unit by being packed into a single JSON tiddler. If a tiddler isn't found in the main store, then the registered plugins are searched for it instead.
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Tiddlers within plugins behave something like shadow tiddlers in classic TiddlyWiki: they can be freely overwritten by creating a tiddler with the same title, but deleting that tiddler restores the underlying tiddler value from the plugin.
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Plugins also have a `plugin-type` field that may be:
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* `plugin` //(default)// - a plain plugin
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* `theme` - a theme plugin (see ThemeMechanism)
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Plugins can be used to package ordinary content, or can include JavaScript [[modules|Modules]] that extend and enhance the core TiddlyWiki5 functionality.
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Plugins conventionally have a title of the form `$:/plugins/publisher/name`. Plugins that are part of the core TiddlyWiki distribution have titles of the form `$:/plugins/tiddlywiki/name`.
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Plugins that define macros, views or other named entities are expected to prefix the name with their publisher identifier, for example: `tiddlytools.slider`.
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! Plugin format
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Plugins are stored as tiddlers of type `application/json` with the field `plugin` present and the text containing a JSON structure encoding the plugin metadata and the list of tiddlers within it.
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The JSON structure for plugin tiddlers is as follows:
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```
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{
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"title": "$:/plugins/publisher/name",
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"description": "An exemplary plugin for demonstration purposes",
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"author": "JeremyRuston",
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"version": "1.2.3-alpha3",
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"coreVersion": ">=5.0.0",
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"source": "http://tiddlywiki.com/MyPlugin",
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"plugin-type": "plugin",
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"tiddlers": {
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"$:/plugins/publisher/name/title1": {"type": "image/png", "text": "<base64>"},
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"title2": {"text": "Text"}
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}
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}
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```
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The titles of the individual tiddlers are typically prefixed with the title of the containing plugin (as in the **title1** example above), but they are not restricted to do so (the second example specifies a tiddler with the raw title **title2**).
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! Plugin folders
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On the server, plugins can be stored as ordinary JSON tiddlers but it is often more convenient to store them as separate tiddler files within folders. Plugin folders must contain a `plugin.info` file that contains the metadata for the plugin. It can also optionally identify files external to the plugin folder that should be loaded as tiddlers.
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The `plugin.info` file should contain the same JSON as given for plugin tiddlers above, with the `tiddlers` object omitted.
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! Plugin library
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The standard distribution of TiddlyWiki includes a number of standard plugins in the `plugins` directory.
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! Including plugins in a wiki
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To be usable in the browser, plugins just need to be included in the wiki. This is done when the wiki is generated on the server.
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A folder containing an exploded TiddlyWiki can contain a `tiddlywiki.info` file that identifies the plugins to be included in this wiki:
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```
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{
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"plugins": [
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"tiddlywiki/slider",
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"tiddlytools/chooser"
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]
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}
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```
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Plugins names refer to plugin folders listed in TiddlyWiki5's root `plugins` folder.
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Plugins can also be included manually by copying them into the `plugins` subfolder of the wiki.
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! Plugin processing
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The wiki object keeps track of all of the currently loaded plugins. If a request for a tiddler isn't in the store then the wiki looks through the cascade of plugins to find the requested tiddler. It is a similar idea to the way that shadow tiddlers are implemented in classic TiddlyWiki.
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In the browser, any constituent tiddlers that are JavaScript modules (ie shadow tiddlers of content type `application/javascript` and possessing the field `module-type`) are executed during startup processing.
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