extract-func-comment-string.js

/*!
 * Extract a function's comment, useful to have multiline string
 * @link https://gist.github.com/lavoiesl/5880516
 *
 * Don't forget to use /*! to avoid the comment being removed in minification 
 */
// Example:
// var myString = function_to_string(function(){/*!
//   <p>
//     foo bar
//   </p>
// */});

function function_to_string(func, strip_leading_whitespace) {
	if (strip_leading_whitespace === undefined) {
		strip_leading_whitespace = 1;
	}

	let matches = func.toString().match(/function[\s\w]*?\(\)\s*?\{\s*?\/\*\!?\s*?\n([\s\S]+?)\s*?\*\/\s*\}/);

	if (!matches) {
		return false;
	}

	if (strip_leading_whitespace) {
		matches[1] = matches[1].replace(/^(\t| {4})/gm, '');
	}

	return matches[1];
}