change: input manager and prompt rewrite

cli/InputManager.ts

@@ -0,0 +1,196 @@
+interface EventMap {
+  keypress: CLIKeypressEvent;
+  char: CLICharEvent;
+  activate: Event;
+  deactivate: Event;
+  exit: Event;
+  enter: Event;
+  backspace: Event;
+  delete: Event;
+  "arrow-left": Event;
+  "arrow-right": Event;
+  "arrow-up": Event;
+  "arrow-down": Event;
+  [key: string]: Event;
+}
+
+interface EventDetailMap {
+  keypress: {
+    key: number;
+    sequence?: Uint8Array;
+  };
+  char: EventDetailMap["keypress"] & {
+    char: string;
+  };
+}
+
+export type TypedEventTarget<EventMap extends object> = {
+  new (): IntermediateEventTarget<EventMap>;
+};
+
+export interface IntermediateEventTarget<EventMap> extends EventTarget {
+  addEventListener<K extends keyof EventMap>(
+    type: K,
+    listener: (
+      event: EventMap[K] extends Event ? EventMap[K] : Event,
+    ) => EventMap[K] extends Event ? void : never,
+    options?: boolean | AddEventListenerOptions,
+  ): void;
+
+  addEventListener(
+    type: string,
+    listener: EventListenerOrEventListenerObject,
+    options?: boolean | AddEventListenerOptions,
+  ): void;
+
+  removeEventListener<K extends keyof EventMap>(
+    type: K,
+    listener: (
+      event: EventMap[K] extends Event ? EventMap[K] : Event,
+    ) => EventMap[K] extends Event ? void : never,
+    options?: boolean | AddEventListenerOptions,
+  ): void;
+
+  removeEventListener(
+    type: string,
+    listener: EventListenerOrEventListenerObject,
+    options?: boolean | AddEventListenerOptions,
+  ): void;
+}
+
+const ManagerEventTarget = EventTarget as TypedEventTarget<EventMap>;
+
+export class CLICharEvent extends CustomEvent<EventDetailMap["char"]> {
+  constructor(detail: EventDetailMap["char"]) {
+    super("char", { detail, cancelable: true });
+  }
+}
+export class CLIKeypressEvent extends CustomEvent<EventDetailMap["keypress"]> {
+  constructor(detail: EventDetailMap["keypress"]) {
+    super("keypress", { detail, cancelable: true });
+  }
+}
+
+export class InputManager extends ManagerEventTarget {
+  private static instance = new InputManager();
+  private active = false;
+
+  static getInstance(): InputManager {
+    return this.instance ??= new InputManager();
+  }
+
+  static addEventListener = InputManager.prototype.addEventListener.bind(
+    this.instance,
+  );
+  static removeEventListener = InputManager.prototype.removeEventListener.bind(
+    this.instance,
+  );
+  static dispatchEvent = InputManager.prototype.dispatchEvent.bind(
+    this.instance,
+  );
+
+  activate({ raw = true }: { raw?: boolean } = {}) {
+    if (this.active) return;
+    this.active = true;
+    this.dispatchEvent(new Event("activate"));
+    this.listen(raw);
+  }
+
+  deactivate({ dactivateRaw = true }: { dactivateRaw?: boolean } = {}) {
+    if (!this.active) return;
+    this.active = false;
+    this.dispatchEvent(new Event("deactivate"));
+    if (dactivateRaw) Deno.stdin.setRaw(false);
+  }
+
+  once<T extends string>(type: T): Promise<Event> {
+    return new Promise((resolve) => {
+      const handler = (event: Event) => {
+        this.removeEventListener(type, handler);
+        resolve(event);
+      };
+      this.addEventListener(type, handler);
+    });
+  }
+
+  private async listen(raw: boolean) {
+    if (raw) await Deno.stdin.setRaw(true);
+    const buf = new Uint8Array(64);
+
+    while (this.active) {
+      const n = await Deno.stdin.read(buf);
+      if (n === null) break;
+
+      let i = 0;
+      while (i < n) {
+        const byte = buf[i];
+
+        // Ctrl+C
+        if (byte === 3) {
+          this.dispatchEvent(new Event("exit"));
+          await Deno.stdin.setRaw(false);
+          Deno.exit(130);
+        }
+
+        // Enter
+        if (byte === 13) {
+          this.dispatchEvent(new Event("enter"));
+          i++;
+          continue;
+        }
+
+        // Backspace
+        if (byte === 127 || byte === 8) {
+          this.dispatchEvent(new Event("backspace"));
+          i++;
+          continue;
+        }
+
+        // Escape sequences
+        if (byte === 27 && i + 1 < n && buf[i + 1] === 91) {
+          const code = buf[i + 2];
+          switch (code) {
+            case 65:
+              this.dispatchEvent(new Event("arrow-up"));
+              break;
+            case 66:
+              this.dispatchEvent(new Event("arrow-down"));
+              break;
+            case 67:
+              this.dispatchEvent(new Event("arrow-right"));
+              break;
+            case 68:
+              this.dispatchEvent(new Event("arrow-left"));
+              break;
+            case 51:
+              if (i + 3 < n && buf[i + 3] === 126) {
+                this.dispatchEvent(new Event("delete"));
+                i += 4;
+                continue;
+              }
+              break;
+          }
+          i += 3;
+          continue;
+        }
+
+        // Printable ASCII
+        if (byte >= 32 && byte <= 126) {
+          this.dispatchEvent(
+            new CLICharEvent({ key: byte, char: String.fromCharCode(byte) }),
+          );
+          i++;
+          continue;
+        }
+
+        // Unknown
+        this.dispatchEvent(
+          new CLIKeypressEvent({ key: byte, sequence: buf.slice(i, i + 1) }),
+        );
+        i++;
+      }
+    }
+
+    if (raw) await Deno.stdin.setRaw(false);
+  }
+}