1 files changed, 121 insertions, 0 deletions
diff --git a/src/content/dependencies/generateAdditionalFilesList.js b/src/content/dependencies/generateAdditionalFilesList.js
new file mode 100644
index 0000000..eb9fc8b
--- /dev/null
+++ b/src/content/dependencies/generateAdditionalFilesList.js
@@ -0,0 +1,121 @@
+import {empty} from '../../util/sugar.js';
+
+export default {
+  extraDependencies: [
+    'html',
+    'language',
+  ],
+
+  data(additionalFiles, {fileSize = true} = {}) {
+    return {
+      // Additional files are already a serializable format.
+      additionalFiles,
+      showFileSizes: fileSize,
+    };
+  },
+
+  generate(data, {
+    html,
+    language,
+  }) {
+    const fileKeys = data.additionalFiles.flatMap(({files}) => files);
+    const validateFileMapping = (v, validateValue) => {
+      return value => {
+        v.isObject(value);
+
+        // It's OK to skip values for files, but if keys are provided for files
+        // which don't exist, that's an error.
+
+        const unexpectedKeys =
+          Object.keys(value).filter(key => !fileKeys.includes(key))
+
+        if (!empty(unexpectedKeys)) {
+          throw new TypeError(`Unexpected file keys: ${unexpectedKeys.join(', ')}`);
+        }
+
+        const valueErrors = [];
+        for (const [fileKey, fileValue] of Object.entries(value)) {
+          if (fileValue === null) {
+            continue;
+          }
+
+          try {
+            validateValue(fileValue);
+          } catch (error) {
+            error.message = `(${fileKey}) ` + error.message;
+            valueErrors.push(error);
+          }
+        }
+
+        if (!empty(valueErrors)) {
+          throw new AggregateError(valueErrors, `Errors validating values`);
+        }
+      };
+    };
+
+    return html.template({
+      annotation: 'generateAdditionalFilesList',
+
+      slots: {
+        fileLinks: {
+          validate: v => validateFileMapping(v, v.isHTML),
+        },
+
+        fileSizes: {
+          validate: v => validateFileMapping(v, v.isWholeNumber),
+        },
+      },
+
+      content(slots) {
+        if (!slots.fileSizes) {
+          return html.blank();
+        }
+
+        const filesWithLinks = new Set(
+          Object.entries(slots.fileLinks)
+            .filter(([key, value]) => value)
+            .map(([key]) => key));
+
+        if (filesWithLinks.size === 0) {
+          return html.blank();
+        }
+
+        const filteredFileGroups = data.additionalFiles
+          .map(({title, description, files}) => ({
+            title,
+            description,
+            files: files.filter(f => filesWithLinks.has(f)),
+          }))
+          .filter(({files}) => !empty(files));
+
+        if (empty(filteredFileGroups)) {
+          return html.blank();
+        }
+
+        return html.tag('dl',
+          filteredFileGroups.flatMap(({title, description, files}) => [
+            html.tag('dt',
+              (description
+                ? language.$('releaseInfo.additionalFiles.entry.withDescription', {
+                    title,
+                    description,
+                  })
+                : language.$('releaseInfo.additionalFiles.entry', {title}))),
+
+            html.tag('dd',
+              html.tag('ul',
+                files.map(file =>
+                  html.tag('li',
+                    (slots.fileSizes[file]
+                      ? language.$('releaseInfo.additionalFiles.file.withSize', {
+                          file: slots.fileLinks[file],
+                          size: language.formatFileSize(slots.fileSizes[file]),
+                        })
+                      : language.$('releaseInfo.additionalFiles.file', {
+                          file: slots.fileLinks[file],
+                        })))))),
+          ]));
+      },
+    });
+  },
+};