Mobile app PoC (#281)

Initial checkin of mobile "native" app

common/util.ts

@@ -1,4 +1,6 @@
+import { SETTINGS_TEMPLATE } from "./settings_template.ts";
 import { YAML } from "./deps.ts";
+import { Space } from "./spaces/space.ts";
 
 export function safeRun(fn: () => Promise<void>) {
   fn().catch((e) => {
@@ -42,3 +44,32 @@ export function parseYamlSettings(settingsMarkdown: string): {
     return {};
   }
 }
+
+export async function ensureAndLoadSettings(space: Space) {
+  try {
+    await space.getPageMeta("SETTINGS");
+  } catch {
+    await space.writePage(
+      "SETTINGS",
+      SETTINGS_TEMPLATE,
+      true,
+    );
+  }
+
+  const { text: settingsText } = await space.readPage("SETTINGS");
+  const settings = parseYamlSettings(settingsText);
+  if (!settings.indexPage) {
+    settings.indexPage = "index";
+  }
+
+  try {
+    await space.getPageMeta(settings.indexPage);
+  } catch {
+    await space.writePage(
+      settings.indexPage,
+      `Welcome to your new space!`,
+    );
+  }
+
+  return settings;
+}