Add refresh loop

mod.ts

@@ -0,0 +1,11 @@
+import { AnsiTerminalDisplay } from "./ansi.ts";
+import { TextUI } from "./ui.ts";
+export { TextUI } from "./ui.ts";
+
+export async function createTextUI(): Promise<TextUI> {
+  // TODO detect platform
+  var display = new AnsiTerminalDisplay();
+  var ui = new TextUI(display);
+  await ui.init();
+  return ui;
+}

ui.ts

@@ -1,4 +1,4 @@
-import { BufferDrawing, CharBuffer } from "./base.ts";
+import { BufferDrawing, BufferSize, CharBuffer } from "./base.ts";
 import { Display } from "./display.ts";
 
 /**
@@ -23,6 +23,13 @@ export class TextUI {
     await this.display.clear();
   }
 
+  /**
+   * Get the current display size
+   */
+  getSize(): BufferSize {
+    return this.screen.getSize();
+  }
+
   /**
    * Flush the internal buffer to the display
    */
@@ -35,4 +42,14 @@ export class TextUI {
       }
     }
   }
+
+  /**
+   * Start the event loop, waiting for input
+   */
+  async loop(refresh = 1000): Promise<void> {
+    while (true) {
+      await this.flush();
+      await new Promise((resolve) => setTimeout(resolve, refresh));
+    }
+  }
 }