handlebars/print-script

#! /usr/bin/env node

var script = process.argv[2].replace(/\\n/g, '\n')

// node -e "console.log('var foo = ', "
var Handlebars = require('./lib'),
    SourceMap = require('source-map'),
      SourceMapConsumer = SourceMap.SourceMapConsumer;

var template = Handlebars.precompile(script, {
      srcName: 'input.hbs',
      destName: 'output.js',

      assumeObjects: true,
      compat: false,
      strict: true,
      trackIds: true,
      knownHelpersOnly: false
    });

// return console.log(template);

var consumer = new SourceMapConsumer(template.map),
    lines = template.code.split('\n'),
    srcLines = script.split('\n');

console.log();
console.log('Source:');
srcLines.forEach(function(source, index) {
  console.log(index+1, source);
});
console.log();
console.log('Generated:');
console.log(template.code);
lines.forEach(function(source, index) {
  // console.log(index+1, source);
});
console.log();
console.log('Map:');
console.log(template.map);
console.log();

function collectSource(lines, lineName, colName, order) {
  var ret = {},
      ordered = [],
      last;

  // TODO : Find the content that does not have a source mapping
  function collect(current) {
    if (last) {
      var mapLines = lines.slice(last[lineName] - 1, current && current[lineName]);
      if (mapLines.length) {
        if (current) {
          mapLines[mapLines.length-1] = mapLines[mapLines.length-1].slice(0, current[colName]);
        }
        mapLines[0] = mapLines[0].slice(last[colName]);
      }
      ret[last[lineName] + ':' + last[colName]] = mapLines.join('\n');
      ordered.push({
        startLine: last[lineName],
        startCol: last[colName],
        endLine: current && current[lineName]
      });
    }
    last = current;
  }

  consumer.eachMapping(collect, undefined, order);
  collect();

  return ret;
}

srcLines = collectSource(srcLines, 'originalLine', 'originalColumn', SourceMapConsumer.ORIGINAL_ORDER);
lines = collectSource(lines, 'generatedLine', 'generatedColumn');

false && consumer.eachMapping(function(mapping) {
  var originalSrc = srcLines[mapping.originalLine + ':' + mapping.originalColumn],
      generatedSrc = lines[mapping.generatedLine + ':' + mapping.generatedColumn];

  if (!mapping.originalLine) {
    console.log('generated', mapping.generatedLine + ':' + mapping.generatedColumn, generatedSrc);
  } else {
    console.log('map',
        mapping.source,
        mapping.originalLine + ':' + mapping.originalColumn,
        originalSrc,
        '->',
        mapping.generatedLine + ':' + mapping.generatedColumn,
        generatedSrc);
  }
});