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var fakeCsprojFilename = 'Fake_SpecFlow_Fix.csproj';
var xprojFilename = 'MY_REAL_PROJECT_NAME.xproj';  // change this to your .xproj file

  "devDependencies": {
    ...  
    "gulp-util": "3.0.8"
  },

/// <binding BeforeBuild='Build_SpecFlow_CodeBehindFiles' />
var gulp = require('gulp'),
	execSync = require('child_process').execSync,
	tap = require('gulp-tap'),
	path = require('path'),
	fs = require('fs'),
	glob = require('glob'),
	replace = require('gulp-replace'),
	gulpUtil = require('gulp-util');

var specflowToolsPath = '..\\packages\\SpecFlow.2.2.0\\tools\\specflow.exe';

var fakeCsprojContent = '';
var fakeCsprojFilename = 'Fake_SpecFlow_Fix.csproj';
var xprojFilename = 'MY_REAL_PROJECT_NAME.xproj';

function gulpLog(msg) {
    gulpUtil.log(msg);
}

gulp.task('getFilenames', function (cb) {

    try {
        xprojFilename = glob.sync('*.xproj')[0];
    } catch (e) {
        gulpLog('Couldn\'t glob for xproj!');
        throw e;
    }

    gulpLog('Found xproj: ' + xprojFilename);
    fakeCsprojFilename = xprojFilename.replace('.xproj', '.csproj.fake');
    gulpLog('Fake csproj: ' + fakeCsprojFilename);

    cb();
});

gulp.task('generateFakeCsproj', ['getFilenames'], function (cb) {

    fakeCsprojContent = '<?xml version="1.0" encoding="utf-8"?>' +
		// Set the "ToolsVersion" to VS2013, see: https://github.com/techtalk/SpecFlow/issues/471
		'\n<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">' +
		'\n  <PropertyGroup>' +
		'\n    <RootNamespace>' + xprojFilename.replace('.xproj', '') + '</RootNamespace>' +
		'\n  </PropertyGroup>' +
		'\n  <ItemGroup>' +
		'\n    <None Include="app.config">' +
		'\n      <SubType>Designer</SubType>' +
		'\n    </None>';

    gulp.src('**/**.feature')
		.pipe(tap(function (file) {
		    var relativePath = file.path.replace(file.cwd + '\\', '');
		    fakeCsprojContent +=
				'\n    <None Include="' + relativePath + '">' +
				'\n      <Generator>SpecFlowSingleFileGenerator</Generator>' +
				'\n      <LastGenOutput>' + path.basename(file.path) + '.cs</LastGenOutput>' +
				'\n    </None>';
		}))
		.on('end', function () {
		    fakeCsprojContent +=
				'\n  </ItemGroup>' +
				'\n</Project>';

		    gulpLog(fakeCsprojContent);

		    try {
		        fs.writeFileSync(fakeCsprojFilename, fakeCsprojContent);
		    } catch (e) {
		        gulpLog('Couldn\'t save fake csproj!');
		        throw e;
		    }
		    gulpLog('File saved!');

		    cb();
		});
});

gulp.task('generateSpecFlowGlue', ['generateFakeCsproj'], function (cb) {
    var specflowExe = path.join(specflowToolsPath);

    try {
        fs.accessSync(specflowExe, fs.F_OK | fs.X_OK);
    } catch (e) {
        gulpLog('Couldn\'t find specflow.exe!');
        throw e;
    }

    // Credit: http://stackoverflow.com/questions/11363202/specflow-fails-when-trying-to-generate-test-execution-report
    var configFile = specflowExe + '.config';
    var configFileContents = '<?xml version="1.0" encoding="utf-8" ?><configuration><startup><supportedRuntime version="v4.0.30319" /></startup></configuration>';

    try {
        fs.writeFileSync(configFile, configFileContents);
    } catch (e) {
        gulpLog('Couldn\'t write specflow config file!');
        throw e;
    }

    gulpLog('Created: ' + configFile);

    // Credit: http://www.marcusoft.net/2010/12/specflowexe-and-mstest.html
    var command = specflowExe + ' generateall ' + fakeCsprojFilename + ' /force /verbose';
    gulpLog('Calling: ' + command);

    execSync(command, { stdio: [0, 1, 2] });

    try {
        fs.unlinkSync(configFile);
    } catch (e) {
        gulpLog('Couldn\'t remove (clean up) specflow config file!');
        throw e;
    }

    gulpLog('Removed: ' + configFile);

    cb();
});

gulp.task('xUnitTwoFix', ['generateSpecFlowGlue'], function () {
    gulpLog('Fixing SpecFlow generated files for xUnit v2');
    return gulp.src('**/**.feature.cs')
		.pipe(replace(' : Xunit.IUseFixture<', ' : Xunit.IClassFixture<'))
		.pipe(gulp.dest(function (file) {
		    gulpLog("Fixed: " + file.path);
		    return file.base;
		}));
});

gulp.task('Build_SpecFlow_CodeBehindFiles', ['xUnitTwoFix']);