data, yaml: store data step info on Thing constructors

1 files changed, 38 insertions, 0 deletions

diff --git a/src/data/things/homepage-layout.js b/src/data/things/homepage-layout.js
index 38fd5a7a..00d6aef5 100644
--- a/src/data/things/homepage-layout.js
+++ b/src/data/things/homepage-layout.js
@@ -1,3 +1,5 @@
+export const HOMEPAGE_LAYOUT_DATA_FILE = 'homepage.yaml';
+
 import {input} from '#composite';
 import find from '#find';
 import Thing from '#thing';
@@ -182,4 +184,40 @@ export class HomepageLayoutAlbumsRow extends HomepageLayoutRow {
       'Actions': {property: 'actionLinks'},
     },
   });
+
+  static [Thing.getYamlLoadingSpec] = ({
+    documentModes: {headerAndEntries}, // Kludge, see below
+    thingConstructors: {
+      HomepageLayout,
+      HomepageLayoutAlbumsRow,
+    },
+  }) => ({
+    title: `Process homepage layout file`,
+
+    // Kludge: This benefits from the same headerAndEntries style messaging as
+    // albums and tracks (for example), but that document mode is designed to
+    // support multiple files, and only one is actually getting processed here.
+    files: [HOMEPAGE_LAYOUT_DATA_FILE],
+
+    documentMode: headerAndEntries,
+    headerDocumentThing: HomepageLayout,
+    entryDocumentThing: document => {
+      switch (document['Type']) {
+        case 'albums':
+          return HomepageLayoutAlbumsRow;
+        default:
+          throw new TypeError(`No processDocument function for row type ${document['Type']}!`);
+      }
+    },
+
+    save(results) {
+      if (!results[0]) {
+        return;
+      }
+
+      const {header: homepageLayout, entries: rows} = results[0];
+      Object.assign(homepageLayout, {rows});
+      return {homepageLayout};
+    },
+  });
 }