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import { encodeBase64 } from "./deps.ts";
/** Escape sequence: `\x1B` */export const ESC = "\x1B";/** Control sequence intro: `\x1B[` */export const CSI = `${ESC}[`;/** Operating system command: `\x1B]` */export const OSC = `${ESC}]`;/** Ring audio bell: `\u0007` */export const BEL = "\u0007";const SEP = ";";
/** * Cursor handler. * ``` * await Deno.stdout.write( *   new TextEncoder().encode( *     cursor.to(0, 0), *   ), * ); * ``` */export const cursor = {  /**   * Move cursor to x, y, counting from the top left corner.   * @param x Position left.   * @param y Position top.   */  to(x: number, y?: number): string {    if (typeof y !== "number") {      return `${CSI}${x}G`;    }    return `${CSI}${y};${x}H`;  },  /**   * Move cursor by offset.   * @param x Offset left.   * @param y Offset top.   */  move(x: number, y: number): string {    let ret = "";
    if (x < 0) {      ret += `${CSI}${-x}D`;    } else if (x > 0) {      ret += `${CSI}${x}C`;    }
    if (y < 0) {      ret += `${CSI}${-y}A`;    } else if (y > 0) {      ret += `${CSI}${y}B`;    }
    return ret;  },  /**   * Move cursor up by n lines.   * @param count Number of lines.   */  up: (count = 1): string => `${CSI}${count}A`,  /**   * Move cursor down by n lines.   * @param count Number of lines.   */  down: (count = 1): string => `${CSI}${count}B`,  /**   * Move cursor right by n lines.   * @param count Number of lines.   */  forward: (count = 1): string => `${CSI}${count}C`,  /**   * Move cursor left by n lines.   * @param count Number of lines.   */  backward: (count = 1): string => `${CSI}${count}D`,  /**   * Move cursor to the beginning of the line n lines down.   * @param count Number of lines.   */  nextLine: (count = 1): string => `${CSI}E`.repeat(count),  /**   * Move cursor to the beginning of the line n lines up.   * @param count Number of lines.   */  prevLine: (count = 1): string => `${CSI}F`.repeat(count),  /** Move cursor to first column of current row. */  left: `${CSI}G`,  /** Hide cursor. */  hide: `${CSI}?25l`,  /** Show cursor. */  show: `${CSI}?25h`,  /** Save cursor. */  save: `${ESC}7`,  /** Restore cursor. */  restore: `${ESC}8`,};
/** * Scroll handler. * ``` * await Deno.stdout.write( *   new TextEncoder().encode( *     scroll.up(10), *   ), * ); * ``` */export const scroll = {  /**   * Scroll window up by n lines.   * @param count Number of lines.   */  up: (count = 1): string => `${CSI}S`.repeat(count),  /**   * Scroll window down by n lines.   * @param count Number of lines.   */  down: (count = 1): string => `${CSI}T`.repeat(count),};
/** * Erase handler. * ``` * await Deno.stdout.write( *   new TextEncoder().encode( *     erase.up(3), *   ), * ); * ``` */export const erase = {  /** Clear screen. */  screen: `${CSI}2J`,  /**   * Clear screen up.   * @param count Number of lines.   */  up: (count = 1): string => `${CSI}1J`.repeat(count),  /**   * Clear screen down.   * @param count Number of lines.   */  down: (count = 1): string => `${CSI}0J`.repeat(count),  /** Clear current line. */  line: `${CSI}2K`,  /** Clear to line end. */  lineEnd: `${CSI}0K`,  /** Clear to line start. */  lineStart: `${CSI}1K`,  /**   * Clear n line's up.   * @param count Number of lines.   */  lines(count: number): string {    let clear = "";    for (let i = 0; i < count; i++) {      clear += this.line + (i < count - 1 ? cursor.up() : "");    }    clear += cursor.left;    return clear;  },};
/** * Create link. * @param text Link text. * @param url Link url. * ``` * console.log( *   link("Click me.", "https://deno.land"), * ); * ``` */export const link = (text: string, url: string): string =>  [    OSC,    "8",    SEP,    SEP,    url,    BEL,    text,    OSC,    "8",    SEP,    SEP,    BEL,  ].join("");
/** Image options. */export interface ImageOptions {  width?: number;  height?: number;  preserveAspectRatio?: boolean;}
/** * Create image. * @param buffer  Image buffer. * @param options Image options. * ``` * const response = await fetch("https://deno.land/images/hashrock_simple.png"); * const imageBuffer: ArrayBuffer = await response.arrayBuffer(); * console.log( *   image(imageBuffer), * ); * ``` */export const image = (  buffer: string | ArrayBuffer,  options?: ImageOptions,): string => {  let ret = `${OSC}1337;File=inline=1`;
  if (options?.width) {    ret += `;width=${options.width}`;  }
  if (options?.height) {    ret += `;height=${options.height}`;  }
  if (options?.preserveAspectRatio === false) {    ret += ";preserveAspectRatio=0";  }
  return ret + ":" + encodeBase64(buffer) + BEL;};