var makeString = require('./helper/makeString');

function getIndent(str) {
  var matches = str.match(/^[\s\\t]*/gm);
  var indent = matches[0].length;
  
  for (var i = 1; i < matches.length; i++) {
    indent = Math.min(matches[i].length, indent);
  }

  return indent;
}

module.exports = function dedent(str, pattern) {
  str = makeString(str);
  var indent = getIndent(str);
  var reg;

  if (indent === 0) return str;

  if (typeof pattern === 'string') {
    reg = new RegExp('^' + pattern, 'gm');
  } else {
    reg = new RegExp('^[ \\t]{' + indent + '}', 'gm');
  }

  return str.replace(reg, '');
};