3 files changed, 78 insertions, 0 deletions
diff --git a/src/data/composite/things/artist/artistTotalDuration.js b/src/data/composite/things/artist/artistTotalDuration.js
new file mode 100644
index 00000000..54204918
--- /dev/null
+++ b/src/data/composite/things/artist/artistTotalDuration.js
@@ -0,0 +1,72 @@
+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'),
+      mode: input.value('contributions'),
+    }).outputs({
+      '#reverseContributionList': '#contributionsAsArtist',
+    }),
+
+    withReverseContributionList({
+      data: 'trackData',
+      list: input.value('contributorContribs'),
+      mode: input.value('contributions'),
+    }).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/things/artist.js b/src/data/things/artist.js
index 841d652f..3e4c8c2c 100644
--- a/src/data/things/artist.js
+++ b/src/data/things/artist.js
@@ -12,6 +12,7 @@ import Thing from '#thing';
 import {isName, validateArrayItems} from '#validators';
 import {getKebabCase} from '#wiki-data';
 
+import {exposeDependency} from '#composite/control-flow';
 import {withReverseContributionList} from '#composite/wiki-data';
 
 import {
@@ -27,6 +28,8 @@ import {
   wikiData,
 } from '#composite/wiki-properties';
 
+import {artistTotalDuration} from '#composite/things/artist';
+
 export class Artist extends Thing {
   static [Thing.referenceType] = 'artist';
   static [Thing.wikiDataArray] = 'artistData';
@@ -225,6 +228,8 @@ export class Artist extends Thing {
       data: 'flashData',
       list: input.value('commentatorArtists'),
     }),
+
+    totalDuration: artistTotalDuration(),
   });
 
   static [Thing.getSerializeDescriptors] = ({