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Diffstat (limited to 'src/data/composite/things/track/withDate.js')
-rw-r--r-- | src/data/composite/things/track/withDate.js | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/data/composite/things/track/withDate.js b/src/data/composite/things/track/withDate.js new file mode 100644 index 00000000..b5a770e9 --- /dev/null +++ b/src/data/composite/things/track/withDate.js @@ -0,0 +1,34 @@ +// Gets the track's own date. This is either its dateFirstReleased property +// or, if unset, the album's date. + +import {input, templateCompositeFrom} from '#composite'; + +import withPropertyFromAlbum from './withPropertyFromAlbum.js'; + +export default templateCompositeFrom({ + annotation: `withDate`, + + outputs: ['#date'], + + steps: () => [ + { + dependencies: ['dateFirstReleased'], + compute: (continuation, {dateFirstReleased}) => + (dateFirstReleased + ? continuation.raiseOutput({'#date': dateFirstReleased}) + : continuation()), + }, + + withPropertyFromAlbum({ + property: input.value('date'), + }), + + { + dependencies: ['#album.date'], + compute: (continuation, {['#album.date']: albumDate}) => + (albumDate + ? continuation.raiseOutput({'#date': albumDate}) + : continuation.raiseOutput({'#date': null})), + }, + ], +}) |