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59 lines
2 KiB
Markdown
59 lines
2 KiB
Markdown
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## Configuration API
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### Reading Config Settings
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If you are writing a package that you want to make configurable, you'll need to
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read config settings via the `atom.config` global. You can read the current
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value of a namespaced config key with `atom.config.get`:
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```coffeescript
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# read a value with `config.get`
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@showInvisibles() if atom.config.get "editor.showInvisibles"
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```
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Or you can subscribe via `atom.config.observe` to track changes from any view
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object.
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```coffeescript
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{View} = require 'space-pen'
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class MyView extends View
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attached: ->
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@fontSizeObserveSubscription =
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atom.config.observe 'editor.fontSize', (newValue, {previous}) =>
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@adjustFontSize()
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detached: ->
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@fontSizeObserveSubscription.dispose()
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```
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The `atom.config.observe` method will call the given callback immediately with
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the current value for the specified key path, and it will also call it in the
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future whenever the value of that key path changes. If you only want to invoke
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the callback when the next time the value changes, use `atom.config.onDidChange`
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instead.
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Subscription methods return *disposable* subscription objects. Note in the
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example above how we save the subscription to the `@fontSizeObserveSubscription`
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instance variable and dispose of it when the view is detached. To group multiple
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subscriptions together, you can add them all to a
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[`CompositeDisposable`][composite-disposable] that you dispose when the view is
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detached.
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### Writing Config Settings
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The `atom.config` database is populated on startup from `~/.atom/config.cson`,
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but you can programmatically write to it with `atom.config.set`:
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```coffeescript
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# basic key update
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atom.config.set("core.showInvisibles", true)
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```
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If you're exposing package configuration via specific key paths, you'll want to
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associate them with a schema in your package's main module. Read more about
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schemas in the [config API docs][config-api].
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[composite-disposable]: https://atom.io/docs/api/latest/CompositeDisposable
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[config-api]: https://atom.io/docs/api/latest/Config
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