text: // Copyright 2013 Traceur Authors.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  'use strict';
  
  var path = require('path');
  var commandLine;
  var cmdName = path.basename(process.argv[1]);
  try {
    commandLine = new (require('commander').Command)(cmdName);
  } catch (ex) {
    console.error('Commander.js is required for this to work. To install it ' +
                  'run:\n\n  npm install commander\n');
    process.exit(1);
  }
  commandLine.setMaxListeners(100);
  
  var traceurAPI = require('./api.js');
  var interpret = require('./interpreter.js');
  
  // The System object requires traceur, but we want it set for everything that
  // follows. The module sets global.System as a side-effect.
  require('./System.js');
  
  var rootSources = [];
  commandLine.option('--script <fileName>', 'Parse as Script', function(fileName) {
    rootSources.push({name: fileName, type: 'script'});
  });
  
  commandLine.option('--module <fileName>', 'Parse as Module', function(fileName) {
     rootSources.push({name: fileName, type: 'module'});
  });
  
  commandLine.option('--inline <fileName>', 'Parse as Module, format \'inline\'',
    function(fileName) {
     rootSources.push({name: fileName, type: 'module', format: 'inline'});
    }
  );
  
  commandLine.option('--out <FILE>', 'Compile all input files into a single file');
  commandLine.option('--dir <INDIR> <OUTDIR>', 'Compile an input directory of modules into an output directory');
  
  commandLine.option('--longhelp', 'Show all known options');
  commandLine.on('longhelp', function() {
    commandLine.help();
    process.exit();
  });
  
  // Caling process.exit when there is still characters to be flushed to stdout
  // makes Windows drop those characters. We therefor wait until the buffer is
  // empty before really exiting.
  // Since this makes exiting async we need to manually keep track
  var shouldExit = false;
  
  function processExit() {
    shouldExit = true;
    var draining = 0;
    function exit() {
      if (!draining--)
        process.exit();
    }
    if (process.stdout.bufferSize) {
      draining += 1;
      process.stdout.once('drain', exit);
    }
    if (process.stderr.bufferSize) {
      draining += 1;
      process.stderr.once('drain', exit);
    }
    exit();
  }
  
  commandLine.option('-v, --version', 'Show version and exit');
  commandLine.on('version', function() {
    process.stdout.write(System.version.split('@')[1]);
    processExit();
  });
  
  commandLine.on('--help', function() {
    console.log('  Examples:');
    console.log('');
    console.log('    $ %s a.js [args]', cmdName);
    console.log('    $ %s --out compiled.js b.js c.js', cmdName);
    console.log('    $ %s --dir indir outdir', cmdName);
    console.log('');
  });
  
  var commandOptions = new traceurAPI.util.CommandOptions();
  traceurAPI.util.addOptions(commandLine, commandOptions);
  
  commandLine.usage('[options] [files]');
  
  commandLine.command('*').action(function() {
      // The callback seems to receive a "command" at the end of arguments
      for (var i = 0; i < arguments.length - 1; i++) {
        rootSources.push({name: arguments[i], type: 'module'});
      }
    });
  
  commandLine.sourceMaps = false;
  commandLine.parse(process.argv);
  
  // commanderjs sets self[name]=defaultValue if the argument is null.
  // To support --source-maps a legacy boolean we need to transfer the
  // the self value here.
  commandOptions.sourceMaps = commandLine.sourceMaps;
  
  // Set the global options for back compat, but try to use options by argument.
  traceurAPI.options.setFromObject(commandOptions);
  
  if (!shouldExit && !rootSources.length) {
    // TODO: Start trepl
    console.error('\n  Error: At least one input file is needed');
    commandLine.help();
    process.exit(1);
  }
  
  var out = commandLine.out;
  var dir = commandLine.dir;
  if (!shouldExit) {
    if (out) {
      var isSingleFileCompile = /\.js$/.test(out);
      if (isSingleFileCompile) {
        traceurAPI.recursiveModuleCompileToSingleFile(out, rootSources,
          commandOptions).then(function() {
            process.exit(0);
          }).catch(function(err) {
            var errors = err.errors || [err];
            errors.forEach(function(err) {
              console.error(err.stack || err);
            });
            process.exit(1);
          });
      } else {
        traceurAPI.forEachRecursiveModuleCompile(out, rootSources,
            commandOptions);
      }
    } else if (dir) {
      if (rootSources.length !== 1)
        throw new Error('Compile all in directory requires exactly one input filename');
      traceurAPI.compileAllJsFilesInDir(dir, rootSources[0].name, commandOptions);
    } else {
      rootSources.forEach(function(obj) {
        interpret(path.resolve(obj.name), commandOptions);
      });
    }
  }
  