Provide siteDomain and siteRoot fallback

Author: bigtimebuddy

packages/webdoc-template-library/src/template-plugins/LinkerPlugin.js

@@ -3,6 +3,7 @@ import * as external from "@webdoc/externalize";
 import type {Doc, DocType} from "@webdoc/types";
 import fetch from "node-fetch";
 import {promises as fs} from "fs";
+import * as path from "path";
 import {isDataType} from "@webdoc/model";
 import {templateLogger} from "../Logger";
 
@@ -160,7 +161,15 @@ function LinkerPluginShell() {
 
       const manifest = external.read(contents);
       const {registry} = manifest;
-      const {siteDomain, siteRoot} = manifest.metadata;
+      let {siteDomain, siteRoot} = manifest.metadata;
+      
+      // Provide fallback if URL
+      if (siteDomain === undefined && isURL) {
+        const { origin, pathname } = new URL(uri);
+
+        siteDomain = origin;
+        siteRoot = path.dirname(pathname);
+      }
 
       if (!siteDomain) {
         throw new Error("Imported documented interfaces must have a siteDomain!");