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Mention the discover method in the docs

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Dave Pearson
2024-02-14 10:06:00 +00:00
parent a705c34965
commit cbb44bb50c
1 changed files with 12 additions and 1 deletions
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docs/guide/command_palette.md
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@@ -68,7 +68,7 @@ The following example will display a blank screen initially, but if you bring up
5. Highlights matching letters in the search. 5. Highlights matching letters in the search.
6. Adds our custom command provider and the default command provider. 6. Adds our custom command provider and the default command provider.
There are three methods you can override in a command provider: [`startup`][textual.command.Provider.startup], [`search`][textual.command.Provider.search], and [`shutdown`][textual.command.Provider.shutdown]. There are four methods you can override in a command provider: [`startup`][textual.command.Provider.startup], [`search`][textual.command.Provider.search], [`discover`][textual.command.Provider.discover] and [`shutdown`][textual.command.Provider.shutdown].
All of these methods should be coroutines (`async def`). Only `search` is required, the other methods are optional. All of these methods should be coroutines (`async def`). Only `search` is required, the other methods are optional.
Let's explore those methods in detail. Let's explore those methods in detail.
@@ -99,6 +99,17 @@ In the example above, the callback is a lambda which calls the `open_file` metho
This is a deliberate design decision taken to prevent a single broken `Provider` class from making the command palette unusable. This is a deliberate design decision taken to prevent a single broken `Provider` class from making the command palette unusable.
Errors in command providers will be logged to the [console](./devtools.md). Errors in command providers will be logged to the [console](./devtools.md).
### discover method
The [`discover`][textual.command.Provider.discover] method is responsible for providing results (or *hits*) that should be shown to the user when the command palette input is empty;
this is to aid in command discoverability.
`discover` is similar to `search` but with the difference that no search value is passed to it, and it should *yield* instances of [`DiscoveryHit`][textual.command.DiscoveryHit].
There is no matching and no match score is needed.
The [`DiscoveryHit`][textual.command.DiscoveryHit] contains information about how the hit should be displayed, and an optional help string;
discovery hits are sorted in ascending alphabetical order.
It also contains a callback, which will be run if the user selects that command.
### shutdown method ### shutdown method
The [`shutdown`][textual.command.Provider.shutdown] method is called when the command palette is closed. The [`shutdown`][textual.command.Provider.shutdown] method is called when the command palette is closed.