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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// TODO(kt3k): Write test when pty is supported in Deno// See: https://github.com/denoland/deno/issues/3994
const encoder = new TextEncoder();
const LINE_CLEAR = encoder.encode("\r\u001b[K"); // From cli/prompt_secret.tsconst COLOR_RESET = "\u001b[0m";const DEFAULT_INTERVAL = 75;const DEFAULT_SPINNER = ["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"];
// This is a hack to allow us to use the same type for both the color name and an ANSI escape code.// ref: https://github.com/microsoft/TypeScript/issues/29729#issuecomment-460346421// deno-lint-ignore ban-typesexport type Ansi = string & {};export type Color =  | "black"  | "red"  | "green"  | "yellow"  | "blue"  | "magenta"  | "cyan"  | "white"  | "gray"  | Ansi;
const COLORS: Record<Color, string> = {  black: "\u001b[30m",  red: "\u001b[31m",  green: "\u001b[32m",  yellow: "\u001b[33m",  blue: "\u001b[34m",  magenta: "\u001b[35m",  cyan: "\u001b[36m",  white: "\u001b[37m",  gray: "\u001b[90m",};
/** Options for {@linkcode Spinner}. */export interface SpinnerOptions {  /**   * The sequence of characters to be iterated through for animation.   *   * @default {["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"]}   */  spinner?: string[];  /**   * The message to display next to the spinner. This can be changed while the   * spinner is active.   */  message?: string;  /**   * The time between each frame of the spinner in milliseconds.   *   * @default {75}   */  interval?: number;  /** The color of the spinner. Defaults to the default terminal color. */  color?: Color;}
/** * A spinner that can be used to indicate that something is loading. */export class Spinner {  #spinner: string[];  message: string;  #interval: number;  #color?: Color;  #intervalId: number | undefined;  #active = false;
  /**   * Creates a new spinner.   *   * @example   * ```ts   * import { Spinner } from "https://deno.land/std@$STD_VERSION/cli/spinner.ts";   *   * const spinner = new Spinner({ message: "Loading..." });   * ```   */  constructor(options?: SpinnerOptions) {    this.#spinner = options?.spinner ?? DEFAULT_SPINNER;    this.message = options?.message ?? "";    this.#interval = options?.interval ?? DEFAULT_INTERVAL;    this.#color = options?.color ? COLORS[options.color] : undefined;  }
  /**   * Starts the spinner.   *   * @example   * ```ts   * import { Spinner } from "https://deno.land/std@$STD_VERSION/cli/spinner.ts";   *   * const spinner = new Spinner({ message: "Loading..." });   * spinner.start();   * ```   */  start() {    if (this.#active || Deno.stdout.writable.locked) return;    this.#active = true;    let i = 0;    const color = this.#color ?? "";
    // Updates the spinner after the given interval.    const updateFrame = () => {      Deno.stdout.writeSync(LINE_CLEAR);      const frame = encoder.encode(        color + this.#spinner[i] + COLOR_RESET + " " + this.message,      );      Deno.stdout.writeSync(frame);      i = (i + 1) % this.#spinner.length;    };    this.#intervalId = setInterval(updateFrame, this.#interval);  }  /**   * Stops the spinner.   *   * @example   * ```ts   * import { Spinner } from "https://deno.land/std@$STD_VERSION/cli/spinner.ts";   *   * const spinner = new Spinner({ message: "Loading..." });   * spinner.start();   *   * setTimeout(() => {   *  spinner.stop();   *  console.log("Finished loading!");   * }, 3000);   * ```   */  stop() {    if (this.#intervalId && this.#active) {      clearInterval(this.#intervalId);      Deno.stdout.writeSync(LINE_CLEAR); // Clear the current line      this.#active = false;    }  }}