build: external source plugin

this will be the right solution after ProjectEvergreen/greenwood#1296
is closed out and solved.

Author: Luke Schierer

packages/greenwood/src/plugins/collections/generals.js

@@ -0,0 +1,71 @@
+import { General } from "../../schemas/generals";
+import collection from "../../assets/collections/generals/collection";
+
+import debugFunction from "../../lib/debug";
+const DEBUG = debugFunction("plugins/collections/generals");
+
+export const GeneralsSourcesPlugin = () => {
+  return {
+    type: "source",
+    name: "source-plugin-generals",
+    provider: () => {
+      return async function () {
+        const generals = [];
+        await Promise.all(
+          collection.map(async (item) => {
+            if (DEBUG) {
+              console.log(`item is ${item}`);
+            }
+            await import(`../../assets/collections/generals/${item}`, {
+              with: { type: "json" },
+            })
+              .then((jsonData) => {
+                const keys = Object.keys(jsonData);
+                if (keys.includes("default")) {
+                  const valid = General.safeParse(jsonData["default"]);
+                  if (valid.success) {
+                    generals.push(valid.data);
+                  } else {
+                    if (DEBUG) {
+                      console.error(
+                        `error parsing ${item}, `,
+                        valid.error.message
+                      );
+                      console.error(JSON.stringify(jsonData));
+                    }
+                  }
+                }
+              })
+              .catch((error) => {
+                console.error(
+                  `failed to load file for ${item}, `,
+                  `error is: `,
+                  JSON.stringify(error)
+                );
+              });
+          })
+        );
+        return generals.map((item) => {
+          const id = item.id;
+          const route = `/generals/details/${id.toLowerCase()}/`;
+
+          return {
+            title: id,
+            body: getBody(item),
+            route,
+            id,
+            label: id,
+          };
+        });
+      };
+    },
+  };
+};
+
+const getBody = (general) => {
+  return `
+    <h2 class="spectrum-Heading spectrum-Heading--sizeM">
+     ${general.id}
+    </h2>
+  `;
+};