suddendeath.js

#!/bin/node
 
// via http://starwing.net/suddenly_death.html
 
function getByteLength (string) {
  var r = 0;
  for (var i = 0; i < string.length; i++) {
    var c = string.charCodeAt(i);
    // Shift_JIS: 0x0 ～ 0x80, 0xa0 , 0xa1 ～ 0xdf , 0xfd ～ 0xff
    // Unicode : 0x0 ～ 0x80, 0xf8f0, 0xff61 ～ 0xff9f, 0xf8f1 ～ 0xf8f3
    if ((c >= 0x0 && c < 0x81) || 
        (c == 0xf8f0) || 
        (c >= 0xff61 && c < 0xffa0) ||
        (c >= 0xf8f1 && c < 0xf8f4)) {
      r += 1;
    } else {
      r += 2;
    }
  }
  return r;
}
 
function repeatText (string, n) {
  return new Array(n + 1).join(string);
};
 
function getWrappedText (string) {
  var length = Math.floor(getByteLength(string) / 2);
  var upper  = "＿" + repeatText("人", length + 2) + "＿\n";
  var middle = "＞　" + string + "　＜\n";
  var under  = "￣Y" + repeatText("^Y", length + 1) + "￣";
  return upper + middle + under;
}

console.log(getWrappedText(process.argv[2]));