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hsmusic-wiki - HSMusic - static wiki software cataloguing collaborative creation
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-rw-r--r--src/data/composite/things/album/index.js1
-rw-r--r--src/data/composite/things/album/withTrackSections.js21
-rw-r--r--src/data/composite/things/album/withTracks.js13
-rw-r--r--src/data/composite/things/artist/artistTotalDuration.js70
-rw-r--r--src/data/composite/things/artist/index.js1
-rw-r--r--src/data/composite/things/contribution/index.js7
-rw-r--r--src/data/composite/things/contribution/inheritFromContributionPresets.js61
-rw-r--r--src/data/composite/things/contribution/thingPropertyMatches.js33
-rw-r--r--src/data/composite/things/contribution/thingReferenceTypeMatches.js39
-rw-r--r--src/data/composite/things/contribution/withContainingReverseContributionList.js40
-rw-r--r--src/data/composite/things/contribution/withContributionArtist.js34
-rw-r--r--src/data/composite/things/contribution/withContributionContext.js45
-rw-r--r--src/data/composite/things/contribution/withMatchingContributionPresets.js70
-rw-r--r--src/data/composite/things/track/index.js4
-rw-r--r--src/data/composite/things/track/inheritContributionListFromOriginalRelease.js44
-rw-r--r--src/data/composite/things/track/withContainingTrackSection.js1
-rw-r--r--src/data/composite/things/track/withDate.js34
-rw-r--r--src/data/composite/things/track/withHasUniqueCoverArt.js5
-rw-r--r--src/data/composite/things/track/withTrackArtDate.js80
19 files changed, 591 insertions, 12 deletions
diff --git a/src/data/composite/things/album/index.js b/src/data/composite/things/album/index.js
index 8b5098f0..0ef91b87 100644
--- a/src/data/composite/things/album/index.js
+++ b/src/data/composite/things/album/index.js
@@ -1 +1,2 @@
+export {default as withTrackSections} from './withTrackSections.js';
 export {default as withTracks} from './withTracks.js';
diff --git a/src/data/composite/things/album/withTrackSections.js b/src/data/composite/things/album/withTrackSections.js
new file mode 100644
index 00000000..a56bda31
--- /dev/null
+++ b/src/data/composite/things/album/withTrackSections.js
@@ -0,0 +1,21 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import find from '#find';
+
+import {withResolvedReferenceList} from '#composite/wiki-data';
+
+export default templateCompositeFrom({
+  annotation: `withTrackSections`,
+
+  outputs: ['#trackSections'],
+
+  steps: () => [
+    withResolvedReferenceList({
+      list: 'trackSections',
+      data: 'ownTrackSectionData',
+      find: input.value(find.unqualifiedTrackSection),
+    }).outputs({
+      ['#resolvedReferenceList']: '#trackSections',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/album/withTracks.js b/src/data/composite/things/album/withTracks.js
index 3fe6dd2e..c8d27c4c 100644
--- a/src/data/composite/things/album/withTracks.js
+++ b/src/data/composite/things/album/withTracks.js
@@ -1,24 +1,17 @@
 import {input, templateCompositeFrom} from '#composite';
 
-import find from '#find';
-
-import {exitWithoutDependency} from '#composite/control-flow';
 import {withFlattenedList, withPropertyFromList} from '#composite/data';
 import {withResolvedReferenceList} from '#composite/wiki-data';
 
+import withTrackSections from './withTrackSections.js';
+
 export default templateCompositeFrom({
   annotation: `withTracks`,
 
   outputs: ['#tracks'],
 
   steps: () => [
-    withResolvedReferenceList({
-      list: 'trackSections',
-      data: 'ownTrackSectionData',
-      find: input.value(find.unqualifiedTrackSection),
-    }).outputs({
-      ['#resolvedReferenceList']: '#trackSections',
-    }),
+    withTrackSections(),
 
     withPropertyFromList({
       list: '#trackSections',
diff --git a/src/data/composite/things/artist/artistTotalDuration.js b/src/data/composite/things/artist/artistTotalDuration.js
new file mode 100644
index 00000000..ff709f28
--- /dev/null
+++ b/src/data/composite/things/artist/artistTotalDuration.js
@@ -0,0 +1,70 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {exposeDependency} from '#composite/control-flow';
+import {withFilteredList, withPropertyFromList} from '#composite/data';
+import {withContributionListSums, withReverseContributionList}
+  from '#composite/wiki-data';
+
+export default templateCompositeFrom({
+  annotation: `artistTotalDuration`,
+
+  compose: false,
+
+  steps: () => [
+    withReverseContributionList({
+      data: 'trackData',
+      list: input.value('artistContribs'),
+    }).outputs({
+      '#reverseContributionList': '#contributionsAsArtist',
+    }),
+
+    withReverseContributionList({
+      data: 'trackData',
+      list: input.value('contributorContribs'),
+    }).outputs({
+      '#reverseContributionList': '#contributionsAsContributor',
+    }),
+
+    {
+      dependencies: [
+        '#contributionsAsArtist',
+        '#contributionsAsContributor',
+      ],
+
+      compute: (continuation, {
+        ['#contributionsAsArtist']: artistContribs,
+        ['#contributionsAsContributor']: contributorContribs,
+      }) => continuation({
+        ['#allContributions']: [
+          ...artistContribs,
+          ...contributorContribs,
+        ],
+      }),
+    },
+
+    withPropertyFromList({
+      list: '#allContributions',
+      property: input.value('thing'),
+    }),
+
+    withPropertyFromList({
+      list: '#allContributions.thing',
+      property: input.value('isOriginalRelease'),
+    }),
+
+    withFilteredList({
+      list: '#allContributions',
+      filter: '#allContributions.thing.isOriginalRelease',
+    }).outputs({
+      '#filteredList': '#originalContributions',
+    }),
+
+    withContributionListSums({
+      list: '#originalContributions',
+    }),
+
+    exposeDependency({
+      dependency: '#contributionListDuration',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/artist/index.js b/src/data/composite/things/artist/index.js
new file mode 100644
index 00000000..55514c71
--- /dev/null
+++ b/src/data/composite/things/artist/index.js
@@ -0,0 +1 @@
+export {default as artistTotalDuration} from './artistTotalDuration.js';
diff --git a/src/data/composite/things/contribution/index.js b/src/data/composite/things/contribution/index.js
new file mode 100644
index 00000000..9b22be2e
--- /dev/null
+++ b/src/data/composite/things/contribution/index.js
@@ -0,0 +1,7 @@
+export {default as inheritFromContributionPresets} from './inheritFromContributionPresets.js';
+export {default as thingPropertyMatches} from './thingPropertyMatches.js';
+export {default as thingReferenceTypeMatches} from './thingReferenceTypeMatches.js';
+export {default as withContainingReverseContributionList} from './withContainingReverseContributionList.js';
+export {default as withContributionArtist} from './withContributionArtist.js';
+export {default as withContributionContext} from './withContributionContext.js';
+export {default as withMatchingContributionPresets} from './withMatchingContributionPresets.js';
diff --git a/src/data/composite/things/contribution/inheritFromContributionPresets.js b/src/data/composite/things/contribution/inheritFromContributionPresets.js
new file mode 100644
index 00000000..82425b9c
--- /dev/null
+++ b/src/data/composite/things/contribution/inheritFromContributionPresets.js
@@ -0,0 +1,61 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withPropertyFromList, withPropertyFromObject} from '#composite/data';
+
+import withMatchingContributionPresets
+  from './withMatchingContributionPresets.js';
+
+export default templateCompositeFrom({
+  annotation: `inheritFromContributionPresets`,
+
+  inputs: {
+    property: input({type: 'string'}),
+  },
+
+  steps: () => [
+    withMatchingContributionPresets().outputs({
+      '#matchingContributionPresets': '#presets',
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#presets',
+      mode: input.value('empty'),
+    }),
+
+    withPropertyFromList({
+      list: '#presets',
+      property: input('property'),
+    }),
+
+    {
+      dependencies: ['#values'],
+
+      compute: (continuation, {
+        ['#values']: values,
+      }) => continuation({
+        ['#index']:
+          values.findIndex(value =>
+            value !== undefined &&
+            value !== null),
+      }),
+    },
+
+    raiseOutputWithoutDependency({
+      dependency: '#index',
+      mode: input.value('index'),
+    }),
+
+    {
+      dependencies: ['#values', '#index'],
+
+      compute: (continuation, {
+        ['#values']: values,
+        ['#index']: index,
+      }) => continuation({
+        ['#value']:
+          values[index],
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/contribution/thingPropertyMatches.js b/src/data/composite/things/contribution/thingPropertyMatches.js
new file mode 100644
index 00000000..4a37f2cf
--- /dev/null
+++ b/src/data/composite/things/contribution/thingPropertyMatches.js
@@ -0,0 +1,33 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {exitWithoutDependency} from '#composite/control-flow';
+
+export default templateCompositeFrom({
+  annotation: `thingPropertyMatches`,
+
+  compose: false,
+
+  inputs: {
+    value: input({type: 'string'}),
+  },
+
+  steps: () => [
+    exitWithoutDependency({
+      dependency: 'thingProperty',
+      value: input.value(false),
+    }),
+
+    {
+      dependencies: [
+        'thingProperty',
+        input('value'),
+      ],
+
+      compute: ({
+        ['thingProperty']: thingProperty,
+        [input('value')]: value,
+      }) =>
+        thingProperty === value,
+    },
+  ],
+});
diff --git a/src/data/composite/things/contribution/thingReferenceTypeMatches.js b/src/data/composite/things/contribution/thingReferenceTypeMatches.js
new file mode 100644
index 00000000..2ee811af
--- /dev/null
+++ b/src/data/composite/things/contribution/thingReferenceTypeMatches.js
@@ -0,0 +1,39 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {exitWithoutDependency} from '#composite/control-flow';
+import {withPropertyFromObject} from '#composite/data';
+
+export default templateCompositeFrom({
+  annotation: `thingReferenceTypeMatches`,
+
+  compose: false,
+
+  inputs: {
+    value: input({type: 'string'}),
+  },
+
+  steps: () => [
+    exitWithoutDependency({
+      dependency: 'thing',
+      value: input.value(false),
+    }),
+
+    withPropertyFromObject({
+      object: 'thing',
+      property: input.value('constructor'),
+    }),
+
+    {
+      dependencies: [
+        '#thing.constructor',
+        input('value'),
+      ],
+
+      compute: ({
+        ['#thing.constructor']: constructor,
+        [input('value')]: value,
+      }) =>
+        constructor[Symbol.for('Thing.referenceType')] === value,
+    },
+  ],
+});
diff --git a/src/data/composite/things/contribution/withContainingReverseContributionList.js b/src/data/composite/things/contribution/withContainingReverseContributionList.js
new file mode 100644
index 00000000..56704c8b
--- /dev/null
+++ b/src/data/composite/things/contribution/withContainingReverseContributionList.js
@@ -0,0 +1,40 @@
+// Get the artist's contribution list containing this property.
+
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withPropertyFromObject} from '#composite/data';
+
+import withContributionArtist from './withContributionArtist.js';
+
+export default templateCompositeFrom({
+  annotation: `withContainingReverseContributionList`,
+
+  inputs: {
+    artistProperty: input({
+      defaultDependency: 'artistProperty',
+      acceptsNull: true,
+    }),
+  },
+
+  outputs: ['#containingReverseContributionList'],
+
+  steps: () => [
+    raiseOutputWithoutDependency({
+      dependency: input('artistProperty'),
+      output: input.value({
+        ['#containingReverseContributionList']:
+          null,
+      }),
+    }),
+
+    withContributionArtist(),
+
+    withPropertyFromObject({
+      object: '#artist',
+      property: input('artistProperty'),
+    }).outputs({
+      ['#value']: '#containingReverseContributionList',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/contribution/withContributionArtist.js b/src/data/composite/things/contribution/withContributionArtist.js
new file mode 100644
index 00000000..5a611c1a
--- /dev/null
+++ b/src/data/composite/things/contribution/withContributionArtist.js
@@ -0,0 +1,34 @@
+import {input, templateCompositeFrom} from '#composite';
+import find from '#find';
+
+import {withPropertyFromObject} from '#composite/data';
+import {withResolvedReference} from '#composite/wiki-data';
+
+export default templateCompositeFrom({
+  annotation: `withContributionArtist`,
+
+  inputs: {
+    ref: input({
+      type: 'string',
+      defaultDependency: 'artist',
+    }),
+  },
+
+  outputs: ['#artist'],
+
+  steps: () => [
+    withPropertyFromObject({
+      object: 'thing',
+      property: input.value('artistData'),
+      internal: input.value(true),
+    }),
+
+    withResolvedReference({
+      ref: input('ref'),
+      data: '#thing.artistData',
+      find: input.value(find.artist),
+    }).outputs({
+      '#resolvedReference': '#artist',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/contribution/withContributionContext.js b/src/data/composite/things/contribution/withContributionContext.js
new file mode 100644
index 00000000..3c1c31c0
--- /dev/null
+++ b/src/data/composite/things/contribution/withContributionContext.js
@@ -0,0 +1,45 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+
+export default templateCompositeFrom({
+  annotation: `withContributionContext`,
+
+  outputs: [
+    '#contributionTarget',
+    '#contributionProperty',
+  ],
+
+  steps: () => [
+    raiseOutputWithoutDependency({
+      dependency: 'thing',
+      output: input.value({
+        '#contributionTarget': null,
+        '#contributionProperty': null,
+      }),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: 'thingProperty',
+      output: input.value({
+        '#contributionTarget': null,
+        '#contributionProperty': null,
+      }),
+    }),
+
+    {
+      dependencies: ['thing', 'thingProperty'],
+
+      compute: (continuation, {
+        ['thing']: thing,
+        ['thingProperty']: thingProperty,
+      }) => continuation({
+        ['#contributionTarget']:
+          thing.constructor[Symbol.for('Thing.referenceType')],
+
+        ['#contributionProperty']:
+          thingProperty,
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/contribution/withMatchingContributionPresets.js b/src/data/composite/things/contribution/withMatchingContributionPresets.js
new file mode 100644
index 00000000..09454164
--- /dev/null
+++ b/src/data/composite/things/contribution/withMatchingContributionPresets.js
@@ -0,0 +1,70 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withPropertyFromObject} from '#composite/data';
+
+import withContributionContext from './withContributionContext.js';
+
+export default templateCompositeFrom({
+  annotation: `withMatchingContributionPresets`,
+
+  outputs: ['#matchingContributionPresets'],
+
+  steps: () => [
+    withPropertyFromObject({
+      object: 'thing',
+      property: input.value('wikiInfo'),
+      internal: input.value(true),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#thing.wikiInfo',
+      output: input.value({
+        '#matchingContributionPresets': null,
+      }),
+    }),
+
+    withPropertyFromObject({
+      object: '#thing.wikiInfo',
+      property: input.value('contributionPresets'),
+    }).outputs({
+      '#thing.wikiInfo.contributionPresets': '#contributionPresets',
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#contributionPresets',
+      mode: input.value('empty'),
+      output: input.value({
+        '#matchingContributionPresets': [],
+      }),
+    }),
+
+    withContributionContext(),
+
+    {
+      dependencies: [
+        '#contributionPresets',
+        '#contributionTarget',
+        '#contributionProperty',
+        'annotation',
+      ],
+
+      compute: (continuation, {
+        ['#contributionPresets']: presets,
+        ['#contributionTarget']: target,
+        ['#contributionProperty']: property,
+        ['annotation']: annotation,
+      }) => continuation({
+        ['#matchingContributionPresets']:
+          presets
+            .filter(preset =>
+              preset.context[0] === target &&
+              preset.context.slice(1).includes(property) &&
+              // For now, only match if the annotation is a complete match.
+              // Partial matches (e.g. because the contribution includes "two"
+              // annotations, separated by commas) don't count.
+              preset.annotation === annotation),
+      })
+    },
+  ],
+});
diff --git a/src/data/composite/things/track/index.js b/src/data/composite/things/track/index.js
index 8959de9f..714858a0 100644
--- a/src/data/composite/things/track/index.js
+++ b/src/data/composite/things/track/index.js
@@ -1,12 +1,16 @@
 export {default as exitWithoutUniqueCoverArt} from './exitWithoutUniqueCoverArt.js';
 export {default as inferredAdditionalNameList} from './inferredAdditionalNameList.js';
+export {default as inheritContributionListFromOriginalRelease} from './inheritContributionListFromOriginalRelease.js';
 export {default as inheritFromOriginalRelease} from './inheritFromOriginalRelease.js';
 export {default as sharedAdditionalNameList} from './sharedAdditionalNameList.js';
 export {default as trackReverseReferenceList} from './trackReverseReferenceList.js';
 export {default as withAlbum} from './withAlbum.js';
 export {default as withAlwaysReferenceByDirectory} from './withAlwaysReferenceByDirectory.js';
 export {default as withContainingTrackSection} from './withContainingTrackSection.js';
+export {default as withDate} from './withDate.js';
 export {default as withHasUniqueCoverArt} from './withHasUniqueCoverArt.js';
+export {default as withOriginalRelease} from './withOriginalRelease.js';
 export {default as withOtherReleases} from './withOtherReleases.js';
 export {default as withPropertyFromAlbum} from './withPropertyFromAlbum.js';
 export {default as withPropertyFromOriginalRelease} from './withPropertyFromOriginalRelease.js';
+export {default as withTrackArtDate} from './withTrackArtDate.js';
diff --git a/src/data/composite/things/track/inheritContributionListFromOriginalRelease.js b/src/data/composite/things/track/inheritContributionListFromOriginalRelease.js
new file mode 100644
index 00000000..f4ae3ddb
--- /dev/null
+++ b/src/data/composite/things/track/inheritContributionListFromOriginalRelease.js
@@ -0,0 +1,44 @@
+// Like inheritFromOriginalRelease, but tuned for contributions.
+// Recontextualized contributions for this track.
+
+import {input, templateCompositeFrom} from '#composite';
+
+import {exposeDependency, raiseOutputWithoutDependency}
+  from '#composite/control-flow';
+import {withRecontextualizedContributionList, withRedatedContributionList}
+  from '#composite/wiki-data';
+
+import withDate from './withDate.js';
+import withPropertyFromOriginalRelease
+  from './withPropertyFromOriginalRelease.js';
+
+export default templateCompositeFrom({
+  annotation: `inheritContributionListFromOriginalRelease`,
+
+  steps: () => [
+    withPropertyFromOriginalRelease({
+      property: input.thisProperty(),
+      notFoundValue: input.value([]),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#isRerelease',
+      mode: input.value('falsy'),
+    }),
+
+    withRecontextualizedContributionList({
+      list: '#originalValue',
+    }),
+
+    withDate(),
+
+    withRedatedContributionList({
+      list: '#originalValue',
+      date: '#date',
+    }),
+
+    exposeDependency({
+      dependency: '#originalValue',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/track/withContainingTrackSection.js b/src/data/composite/things/track/withContainingTrackSection.js
index eaac14de..2c42709b 100644
--- a/src/data/composite/things/track/withContainingTrackSection.js
+++ b/src/data/composite/things/track/withContainingTrackSection.js
@@ -30,7 +30,6 @@ export default templateCompositeFrom({
 
       compute: (continuation, {
         [input.myself()]: track,
-        [input('notFoundMode')]: notFoundMode,
         ['#album.trackSections']: trackSections,
       }) => continuation({
         ['#trackSection']:
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})),
+    },
+  ],
+})
diff --git a/src/data/composite/things/track/withHasUniqueCoverArt.js b/src/data/composite/things/track/withHasUniqueCoverArt.js
index 96078d5f..f7e65f25 100644
--- a/src/data/composite/things/track/withHasUniqueCoverArt.js
+++ b/src/data/composite/things/track/withHasUniqueCoverArt.js
@@ -29,7 +29,10 @@ export default templateCompositeFrom({
           : continuation()),
     },
 
-    withResolvedContribs({from: 'coverArtistContribs'}),
+    withResolvedContribs({
+      from: 'coverArtistContribs',
+      date: input.value(null),
+    }),
 
     {
       dependencies: ['#resolvedContribs'],
diff --git a/src/data/composite/things/track/withTrackArtDate.js b/src/data/composite/things/track/withTrackArtDate.js
new file mode 100644
index 00000000..e2c4d8bc
--- /dev/null
+++ b/src/data/composite/things/track/withTrackArtDate.js
@@ -0,0 +1,80 @@
+// Gets the date of cover art release. This represents only the track's own
+// unique cover artwork, if any.
+//
+// If the 'fallback' option is false (the default), this will only output
+// the track's own coverArtDate or its album's trackArtDate. If 'fallback'
+// is set, and neither of these is available, it'll output the track's own
+// date instead.
+
+import {input, templateCompositeFrom} from '#composite';
+import {isDate} from '#validators';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+
+import withDate from './withDate.js';
+import withHasUniqueCoverArt from './withHasUniqueCoverArt.js';
+import withPropertyFromAlbum from './withPropertyFromAlbum.js';
+
+export default templateCompositeFrom({
+  annotation: `withTrackArtDate`,
+
+  inputs: {
+    from: input({
+      validate: isDate,
+      defaultDependency: 'coverArtDate',
+      acceptsNull: true,
+    }),
+
+    fallback: input({
+      type: 'boolean',
+      defaultValue: false,
+    }),
+  },
+
+  outputs: ['#trackArtDate'],
+
+  steps: () => [
+    withHasUniqueCoverArt(),
+
+    raiseOutputWithoutDependency({
+      dependency: '#hasUniqueCoverArt',
+      mode: input.value('falsy'),
+      output: input.value({'#trackArtDate': null}),
+    }),
+
+    {
+      dependencies: [input('from')],
+      compute: (continuation, {
+        [input('from')]: from,
+      }) =>
+        (from
+          ? continuation.raiseOutput({'#trackArtDate': from})
+          : continuation()),
+    },
+
+    withPropertyFromAlbum({
+      property: input.value('trackArtDate'),
+    }),
+
+    {
+      dependencies: [
+        '#album.trackArtDate',
+        input('fallback'),
+      ],
+
+      compute: (continuation, {
+        ['#album.trackArtDate']: albumTrackArtDate,
+        [input('fallback')]: fallback,
+      }) =>
+        (albumTrackArtDate
+          ? continuation.raiseOutput({'#trackArtDate': albumTrackArtDate})
+       : fallback
+          ? continuation()
+          : continuation.raiseOutput({'#trackArtDate': null})),
+    },
+
+    withDate().outputs({
+      '#date': '#trackArtDate',
+    }),
+  ],
+});