etherpad-lite/bin/settings2yml

#!/usr/bin/env node
var fs = require('fs'),
  jsparser = require('uglify-js').parser;


if(process.argv.length != 3){
  console.error('Usage: ' + process.argv[1] + ' [filename]');
  process.exit(1);
}
var settingsStr = fs.readFileSync(process.argv[2]).toString();

var token = {};
var t = jsparser.tokenizer(settingsStr);


indent = -1

var ymlStr = '';

var valueIsNext = false;

function escapeString(s){
  if(s.indexOf('\n') != -1 || s.indexOf(':') != -1 || s.indexOf('\'') != -1 ){
    return JSON.stringify(s);
  }
  return s;
}

function indentation(i){
  s = ''
  while (i-- > 0) s += '  '
  return s; 
}


while((token = t()).type !== 'eof'){
  var type = token.type,
    value = token.value,
    comments = token.comments_before.map(function(c){return c.value.split('\n') })
  if(type == 'punc' && value == '{') { indent++; ymlStr += "\n"; valueIsNext = false};
  if(type == 'punc' && value == '}') indent--;
  if(type == 'punc' && value == ':')  {ymlStr += ' : '; valueIsNext = true };
  if(type == 'punc' && value == ',')  {ymlStr += '\n'; valueIsNext = false };
  
  if(type == 'string' || type == 'name' || type == 'num'){
    if(!valueIsNext){
      if(comments.length > 0){
        
        ymlStr += indentation(indent) + "\n" +
          comments.map(function(s){return "\n" + indentation(indent) + '#' + s.join("\n" + indentation(indent) + '#')}).join('\n') +'\n';
      }
      ymlStr += indentation(indent);
    }
    ymlStr += (type == 'string') ? escapeString(value) : value;
  }
}

console.log(ymlStr);