cowsay.js

#!/usr/bin/env node

// https://gist.github.com/ishu3101/9fa58ca1440f780d6288#file-read_arguments-js

var args = process.argv.slice(2);
var input = args[0];

var isTTY = process.stdin.isTTY;
var stdin = process.stdin;
var stdout = process.stdout;

// If no STDIN and no arguments, display usage message
if (isTTY && args.length === 0) {
  console.log("Usage: ");
}
// If no STDIN but arguments given
else if (isTTY && args.length !== 0) {
  handleShellArguments();
}
// read from STDIN
else {
  handlePipedContent();
}

function handlePipedContent() {
  var data = "";

  stdin.on("readable", function () {
    var chuck = stdin.read();
    if (chuck !== null) {
      data += chuck;
    }
  });
  stdin.on("end", function () {
    stdout.write(cowSay(data));
  });
}

function handleShellArguments() {
  console.log(cowSay(input));
}

/**
 * cowsay.js
 */
function cowSay(data) {
  const cow = `
        \\   ^__^
         \\  (oo)\\_______
            (__)\\       )\\/\\
                ||----w |
                ||     ||`.replace(/^\n/g, "");

  const lines = [];
  for (let i = 0, line = ""; i < data.length; i++) {
    line += data[i];
    if (line.length === 39 || i === data.length - 1) {
      while (lines.length > 0 && line.length < 39) line += " ";
      lines.push(line);
      line = "";
    }
  }

  if (!lines.length) return "";

  const dashCount = lines[0].length + 2;
  const header = ` ${`_`.repeat(dashCount)} \n`;
  const footer = ` ${`-`.repeat(dashCount)} \n`;

  let message = "";
  if (lines.length === 1) message = `< ${data} >\n`;
  else {
    let firstLine = `/ ${lines.shift()} \\\n`;
    let lastLine = `\\ ${lines.pop()} /\n`;
    let betweens = lines.map((l) => `| ${l} |\n`).join("");
    message = firstLine + betweens + lastLine;
  }

  return header + message + footer + cow;
}



/*
@gprasanth92

 _____________________
< #100DaysOfCode #Fun >
 ---------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||
*/