text: var gulp = require('gulp');
  var execFile = require('child_process').execFile;
  var glob = require('glob');
  
  function exec(command, cb) {
    execFile('sh', ['-c', command], cb);
  }
  
  var protoc = process.env.PROTOC || '../src/protoc';
  
  var wellKnownTypes = [
    '../src/google/protobuf/any.proto',
    '../src/google/protobuf/api.proto',
    '../src/google/protobuf/compiler/plugin.proto',
    '../src/google/protobuf/descriptor.proto',
    '../src/google/protobuf/duration.proto',
    '../src/google/protobuf/empty.proto',
    '../src/google/protobuf/field_mask.proto',
    '../src/google/protobuf/source_context.proto',
    '../src/google/protobuf/struct.proto',
    '../src/google/protobuf/timestamp.proto',
    '../src/google/protobuf/type.proto',
    '../src/google/protobuf/wrappers.proto',
  ];
  
  var group1Protos = [
    'data.proto',
    'test3.proto',
    'test5.proto',
    'commonjs/test6/test6.proto',
    'test8.proto',
    'test11.proto',
    'test12.proto',
    'test13.proto',
    'test14.proto',
    'test15.proto',
    'testbinary.proto',
    'testempty.proto',
    'test.proto',
  ];
  
  var group2Protos = [
    'proto3_test.proto',
    'test2.proto',
    'test4.proto',
    'commonjs/test7/test7.proto',
  ];
  
  var group3Protos = [
    'test9.proto',
    'test10.proto'
  ];
  
  
  gulp.task('genproto_well_known_types_closure', function (cb) {
    exec(protoc + ' --js_out=one_output_file_per_input_file,binary:. -I ../src -I . ' + wellKnownTypes.join(' '),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('genproto_group1_closure', function (cb) {
    exec(protoc + ' --js_out=library=testproto_libs1,binary:.  -I ../src -I . ' + group1Protos.join(' '),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('genproto_group2_closure', function (cb) {
    exec(protoc + ' --js_out=library=testproto_libs2,binary:.  -I ../src -I . -I commonjs ' + group2Protos.join(' '),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('genproto_well_known_types_commonjs', function (cb) {
    exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out -I ../src ' + wellKnownTypes.join(' '),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('genproto_group1_commonjs', function (cb) {
    exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out -I ../src -I commonjs -I . ' + group1Protos.join(' '),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('genproto_group2_commonjs', function (cb) {
    exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out -I ../src -I commonjs -I . ' + group2Protos.join(' '),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('genproto_commonjs_wellknowntypes', function (cb) {
    exec('mkdir -p commonjs_out/node_modules/google-protobuf && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out/node_modules/google-protobuf -I ../src ' + wellKnownTypes.join(' '),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('genproto_wellknowntypes', function (cb) {
    exec(protoc + ' --js_out=import_style=commonjs,binary:. -I ../src ' + wellKnownTypes.join(' '),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  gulp.task('genproto_group3_commonjs_strict', function (cb) {
    exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs_strict,binary:commonjs_out -I ../src -I commonjs -I . ' + group3Protos.join(' '),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  
  function getClosureBuilderCommand(exportsFile, outputFile) {
    return './node_modules/google-closure-library/closure/bin/build/closurebuilder.py ' +
    '--root node_modules ' +
    '-o compiled ' +
    '--compiler_jar node_modules/google-closure-compiler/compiler.jar ' +
    '-i ' + exportsFile + ' ' +
    'map.js message.js binary/arith.js binary/constants.js binary/decoder.js ' +
    'binary/encoder.js binary/reader.js binary/utils.js binary/writer.js ' +
    exportsFile  + ' > ' + outputFile;
  }
  
  gulp.task('dist', ['genproto_wellknowntypes'], function (cb) {
    // TODO(haberman): minify this more aggressively.
    // Will require proper externs/exports.
    exec(getClosureBuilderCommand('commonjs/export.js', 'google-protobuf.js'),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('commonjs_asserts', function (cb) {
    exec('mkdir -p commonjs_out/test_node_modules && ' +
         getClosureBuilderCommand(
             'commonjs/export_asserts.js',
             'commonjs_out/test_node_modules/closure_asserts_commonjs.js'),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('commonjs_testdeps', function (cb) {
    exec('mkdir -p commonjs_out/test_node_modules && ' +
         getClosureBuilderCommand(
             'commonjs/export_testdeps.js',
             'commonjs_out/test_node_modules/testdeps_commonjs.js'),
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('make_commonjs_out', ['dist', 'genproto_well_known_types_commonjs', 'genproto_group1_commonjs', 'genproto_group2_commonjs', 'genproto_commonjs_wellknowntypes', 'commonjs_asserts', 'commonjs_testdeps', 'genproto_group3_commonjs_strict'], function (cb) {
    // TODO(haberman): minify this more aggressively.
    // Will require proper externs/exports.
    var cmd = "mkdir -p commonjs_out/binary && mkdir -p commonjs_out/test_node_modules && ";
    function addTestFile(file) {
      cmd += 'node commonjs/rewrite_tests_for_commonjs.js < ' + file +
             ' > commonjs_out/' + file + '&& ';
    }
  
    glob.sync('*_test.js').forEach(addTestFile);
    glob.sync('binary/*_test.js').forEach(addTestFile);
  
    exec(cmd +
         'cp commonjs/jasmine.json commonjs_out/jasmine.json && ' +
         'cp google-protobuf.js commonjs_out/test_node_modules && ' +
         'cp commonjs/strict_test.js commonjs_out/strict_test.js &&' +
         'cp commonjs/import_test.js commonjs_out/import_test.js',
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('deps', ['genproto_well_known_types_closure', 'genproto_group1_closure', 'genproto_group2_closure'], function (cb) {
    exec('./node_modules/google-closure-library/closure/bin/build/depswriter.py binary/arith.js binary/constants.js binary/decoder.js binary/encoder.js binary/reader.js binary/utils.js binary/writer.js debug.js map.js message.js node_loader.js test_bootstrap.js > deps.js',
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('test_closure', ['genproto_well_known_types_closure', 'genproto_group1_closure', 'genproto_group2_closure', 'deps'], function (cb) {
    exec('JASMINE_CONFIG_PATH=jasmine.json ./node_modules/.bin/jasmine',
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('test_commonjs', ['make_commonjs_out'], function (cb) {
    exec('cd commonjs_out && JASMINE_CONFIG_PATH=jasmine.json NODE_PATH=test_node_modules ../node_modules/.bin/jasmine',
         function (err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    });
  });
  
  gulp.task('test', ['test_closure', 'test_commonjs'], function(cb) {
    cb();
  });
  