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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// Copyright Sindre Sorhus and chalk/supports-color contributors. All rights reserved. MIT license.import { parse } from "./deps.ts";
export interface SupportsColorOptions {  /** Whether or not to use command line arguments to detect color support */  sniffFlags?: boolean;
  /** Override for the automatic detection of whether the stream is a TTY or not */  streamIsTTY?: boolean;
  /** Override for the command line arguments*/  args?: string[];
  /** Override for what OS to detect color support of */  os?: typeof Deno.build.os;
  /** Override for what release your OS is*/  osRelease?: string;}
export interface ColorSupport {  level: number;  /** Basic color support (16 colors) */  hasBasic: boolean;  /** 256 color support */  has256: boolean;  /** Truecolor support (16 million colors) */  has16m: boolean;}
function envForceColor() {  const FORCE_COLOR = Deno.env.get("FORCE_COLOR");
  if (FORCE_COLOR) {    if (FORCE_COLOR === "true") {      return 1;    }
    if (FORCE_COLOR === "false") {      return 0;    }
    return FORCE_COLOR.length === 0      ? 1      : Math.min(Number.parseInt(FORCE_COLOR, 10), 3);  }}
function translateLevel(level: number): ColorSupport {  return {    level,    hasBasic: level >= 1,    has256: level >= 2,    has16m: level >= 3,  };}
function _supportsColor(  haveWriter?: {    readonly rid: number;  },  {    streamIsTTY,    sniffFlags = true,    args = Deno.args,    os = Deno.build.os,    osRelease = Deno.osRelease(),  }: SupportsColorOptions = {},) {  // Read flags to see if anything matches to force colors or to force no colors  const { _, color, colors } = parse(args, {    string: ["color", "colors"],    negatable: ["color", "colors"],  });
  // console.log(color === "", colors)
  let flagForceColor: number | undefined;  if (    color === false ||    colors === false ||    color === "false" ||    color === "never"  ) {    flagForceColor = 0;  } else if (    color === "" || // --color with no arguments results in this    colors === "" || // --colors with no arguments results in this    color === "true" ||    color === "always"  ) {    flagForceColor = 1;  }
  // Read environment variables to see if anything forces colors or to force no colors  const noFlagForceColor = envForceColor();  if (noFlagForceColor !== undefined) {    flagForceColor = noFlagForceColor;  }
  // The final value for colors being forced or not  const forceColor = sniffFlags ? flagForceColor : noFlagForceColor;
  // If we force no colors, return no color  if (forceColor === 0) {    return 0;  }
  // If we sniff flags, look through the flags to see if we are forcing certain colors  if (sniffFlags) {    if (      color === "16m" ||      color === "full" ||      color === "truecolor"    ) {      return 3;    }
    if (color === "256") {      return 2;    }  }
  // Check for Azure DevOps pipelines.  // Has to be above the `!streamIsTTY` check.  if ("TF_BUILD" in Deno.env && "AGENT_NAME" in Deno.env) {    return 1;  }
  // If we aren't a TTY and we aren't forcing color then show no colors  if (haveWriter && !streamIsTTY && forceColor === undefined) {    return 0;  }
  const min = forceColor || 0;
  if (Deno.env.get("TERM") === "dumb") {    return min;  }
  if (os === "windows") {    // Windows 10 build 10586 is the first Windows release that supports 256 colors.    // Windows 10 build 14931 is the first release that supports 16m/TrueColor.    const release = osRelease.split(".");    if (      Number(release[0]) >= 10 &&      Number(release[2]) >= 10_586    ) {      return Number(release[2]) >= 14_931 ? 3 : 2;    }
    return 1;  }
  if (Deno.env.get("CI")) {    if (Deno.env.get("GITHUB_ACTIONS")) {      return 3;    }
    if (      ["TRAVIS", "CIRCLECI", "APPVEYOR", "GITLAB_CI", "BUILDKITE", "DRONE"]        .some((sign) => Deno.env.get(sign) !== undefined) ||      Deno.env.get("CI_NAME") === "codeship"    ) {      return 1;    }
    return min;  }
  if (Deno.env.get("TEAMCITY_VERSION")) {    return /^(9\.(0*[1-9]\d*)\.|\d{2,}\.)/.test(        Deno.env.get("TEAMCITY_VERSION") ?? "",      )      ? 1      : 0;  }
  if (Deno.env.get("COLORTERM") === "truecolor") {    return 3;  }
  if (Deno.env.get("TERM") === "xterm-kitty") {    return 3;  }
  if (Deno.env.get("TERM_PROGRAM")) {    const version = Number.parseInt(      (Deno.env.get("TERM_PROGRAM_VERSION") || "").split(".")[0],      10,    );
    switch (Deno.env.get("TERM_PROGRAM")) {      case "iTerm.app": {        return version >= 3 ? 3 : 2;      }
      case "Apple_Terminal": {        return 2;      }        // No default    }  }
  if (/-256(color)?$/i.test(Deno.env.get("TERM") ?? "")) {    return 2;  }
  if (    /^screen|^xterm|^vt100|^vt220|^rxvt|color|ansi|cygwin|linux/i.test(      Deno.env.get("TERM") ?? "",    )  ) {    return 1;  }
  if (Deno.env.get("COLORTERM")) {    return 1;  }
  return min;}
/** * Given a writer with an rid, determine the amount of color support it has. */export function createSupportsColor(  writer: {    readonly rid: number;  },  options: SupportsColorOptions = {},) {  const level = _supportsColor(writer, {    streamIsTTY: writer && Deno.isatty(writer.rid),    ...options,  });
  return translateLevel(level);}
const supportsColor = {  stdout: createSupportsColor(Deno.stdout),  stderr: createSupportsColor(Deno.stderr),};
export default supportsColor;