Gulpfile.js to use with Django projects. Based on gulpfile.js from Google Web Starter Kit.

gulpfile.js

//Based on gulpfile.js from Google Web Starter Kit.
//https://github.com/google/web-starter-kit
'use strict';

// Include Gulp & Tools We'll Use
var gulp = require('gulp');
var $ = require('gulp-load-plugins')();
var del = require('del');
var runSequence = require('run-sequence');
var browserSync = require('browser-sync');
var pagespeed = require('psi');
var reload = browserSync.reload;
var exec = require('child_process').exec;
var notifier = require('node-notifier');

var AUTOPREFIXER_BROWSERS = [
  'ie >= 10',
  'ie_mob >= 10',
  'ff >= 30',
  'chrome >= 34',
  'safari >= 7',
  'opera >= 23',
  'ios >= 7',
  'android >= 4.4',
  'bb >= 10'
];

function getRelativePath(absPath) {
    absPath = absPath.replace(/\\/g, '/');
    var curDir = __dirname.replace(/\\/g, '/');
    return absPath.replace(curDir, '');
}

function logUglifyError(error) {
    this.emit('end');
    var file = getRelativePath(error.fileName);
    $.util.log($.util.colors.bgRed('Uglify Error:'))
    $.util.log($.util.colors.bgMagenta('file: ') + $.util.colors.inverse(file));
    $.util.log($.util.colors.bgMagenta('line: '+error.lineNumber));
    //remove path from error message
    var message = error.message.substr(error.message.indexOf(' ')+1);
    $.util.log($.util.colors.bgRed(message));
    notifier.notify({ title: 'Gulp message', message: 'Uglify error!' });
}

function logCoffeeError(error) {
    this.emit('end');
     var file = getRelativePath(error.filename);
    $.util.log($.util.colors.bgRed('Coffee Error:'))
    $.util.log($.util.colors.bgMagenta('file: ') + $.util.colors.inverse(file));
    $.util.log($.util.colors.bgMagenta('line: '+error.location.first_line+', column: '+error.location.first_column));
    $.util.log($.util.colors.bgRed(error.name+': '+error.message));
    $.util.log($.util.colors.bgMagenta('near: ') + $.util.colors.inverse(error.code));
    notifier.notify({ title: 'Gulp message', message: 'Coffee error!' });
};

function logSASSError(error) {
    var file = getRelativePath(error.file);
    $.util.log($.util.colors.bgRed('Sass Error:'))
    $.util.log($.util.colors.bgMagenta('file: ') + $.util.colors.inverse(file));
    $.util.log($.util.colors.bgMagenta('line: '+error.line+', column: '+error.column));
    $.util.log($.util.colors.bgRed(error.message));
    notifier.notify({ title: 'Gulp message', message: 'SASS Error!' });
}

// Lint JavaScript
gulp.task('jshint', function () {
  return gulp.src('app/static/scripts/**/*.js')
    .pipe(reload({stream: true, once: true}))
    .pipe($.jshint())
    .pipe($.jshint.reporter('jshint-stylish'));
});

//Lint CoffeeScript
gulp.task('coffeelint', function() {
    return gulp.src('app/static/scripts/**/*.coffee')
      .pipe(reload({stream: true, once: true}))
      .pipe($.coffeelint())
      .pipe($.coffeelint.reporter())
})

// Optimize Images
gulp.task('images', function () {
  return gulp.src('app/static/images/**/*')
    .pipe($.cache($.imagemin({
      progressive: true,
      interlaced: true
    })))
    .pipe(gulp.dest('dist/static/images'))
    .pipe($.size({title: 'images'}));
});


// Copy All Files At The Root Level (app)
gulp.task('copy', function () {
  return gulp.src([
    'app/**',
    '!app/**/__pycache__{,/**}',
    '!app/templates{,/**/*.html}',
    '!app/static{/fonts/**,/images/**,/scripts/**,/styles/**}'
  ], {
    dot: true
  }).pipe(gulp.dest('dist'))
    .pipe($.size({title: 'copy'}));
});

// Copy Web Fonts To Dist
gulp.task('fonts', function () {
  return gulp.src(['app/static/fonts/**'])
    .pipe(gulp.dest('dist/static/fonts'))
    .pipe($.size({title: 'fonts'}));
});

// Compile and Automatically Prefix Stylesheets
gulp.task('styles', function () {
    // For best performance, don't add Sass partials to `gulp.src`
    return gulp.src([
      'app/static/styles/*.scss',
      'app/static/styles/**/*.css',
      'app/static/styles/components/components.scss'
    ])
    .pipe($.sourcemaps.init())
    //.pipe($.changed('.tmp/styles', {extension: '.css'}))
    .pipe($.sass({
      precision: 10,
      onError: logSASSError
    }))
    .pipe($.autoprefixer({browsers: AUTOPREFIXER_BROWSERS}))
    .pipe($.sourcemaps.write())
    .pipe(gulp.dest('.tmp/styles'))
    // Concatenate And Minify Styles
    .pipe($.if('*.css', $.csso()))
    .pipe($.rename({suffix: '.min'}))
    .pipe(gulp.dest('dist/static/styles'))
    .pipe($.size({title: 'styles'}));
});


//Concat and minify scripts
gulp.task('scripts', function() {
    return gulp.src([
          'app/static/scripts/**/*.coffee',
          'app/static/scripts/**/*.js'
    ])
    .pipe($.sourcemaps.init())
    .pipe($.changed('.tmp/scripts', {extension: '.js'}))
    .pipe($.if('*.coffee', $.coffee({ bare: true })))
      .on('error',  logCoffeeError)
    .pipe($.concat('app.js'))
    .pipe($.sourcemaps.write())
    .pipe(gulp.dest('.tmp/scripts'))
    .pipe($.uglify())
      .on('error', logUglifyError)
    .pipe($.rename({suffix: '.min'}))
    .pipe(gulp.dest('dist/static/scripts'))
    .pipe($.size({title: 'scripts'}));
})


// Scan Your HTML For Assets & Optimize Them
gulp.task('html', function () {
  var assets = $.useref.assets({searchPath: '{.tmp,app}'});

  return gulp.src('app/templates/**/*.html')
    .pipe(assets)
    // Concatenate And Minify JavaScript
    .pipe($.if('*.js', $.uglify({preserveComments: 'some'})))
    // Remove Any Unused CSS
    // Note: If not using the Style Guide, you can delete it from
    // the next line to only include styles your project uses.
    .pipe($.if('*.css', $.uncss({
      html: [
        'app/templates/**/*.html'
      ],
      // CSS Selectors for UnCSS to ignore
      ignore: [
        /.navdrawer-container.open/,
        /.app-bar.open/
      ]
    })))
    // Concatenate And Minify Styles
    // In case you are still using useref build blocks
    .pipe($.if('*.css', $.csso()))
    .pipe(assets.restore())
    .pipe($.useref())
    // Update Production Style Guide Paths
    .pipe($.replace('components/components.css', 'components/main.min.css'))
    // Minify Any HTML
    .pipe($.if('*.html', $.minifyHtml()))
    // Output Files
    .pipe(gulp.dest('dist/templates'))
    .pipe($.size({title: 'html'}));
});

// Clean Output Directory
gulp.task('clean', del.bind(null, ['.tmp', 'dist/*', '!dist/.git'], {dot: true}));

//Activate virtualenv and run Django server
gulp.task('runserver', function() {
    var isWin = /^win/.test(process.platform);
     var cmd =  '. ../bin/activate';

    if (isWin) { //for Windows
        cmd = '..\\Scripts\\activate';
    }

    var proc = exec(cmd+' && python app/manage.py runserver');
});

gulp.task('runserver:dist', function() {
    var isWin = /^win/.test(process.platform);
     var cmd =  '. ../bin/activate';

    if (isWin) { //for Windows
        cmd = '..\\Scripts\\activate';
    }

    var proc = exec(cmd+' && python dist/manage.py runserver');
});


// Build and serve the output from the dist build
gulp.task('serve:dist', ['build', 'runserver:dist'], function () {
  browserSync({
    notify: false,
    proxy: "127.0.0.1:8000"
  });
});


// Build Production Files
gulp.task('build', ['clean'], function (cb) {
  runSequence('styles', ['jshint', 'coffeelint', 'scripts', 'html', 'images', 'fonts', 'copy'], cb);
});


// Watch Files For Changes & Reload, the default task
gulp.task('default', ['styles', 'jshint', 'coffeelint', 'scripts', 'runserver'], function () {
  browserSync({
    notify: false,
    proxy: "127.0.0.1:8000"
  });

  gulp.watch(['app/**/*.html'], reload);
  gulp.watch(['app/static/styles/**/*.{scss,css}'], ['styles', reload]);
  gulp.watch(['app/static/scripts/**/*.js'], ['jshint']);
  gulp.watch(['app/static/scripts/**/*.coffee'], ['coffeelint']);
  gulp.watch(['app/static/scripts/**/*.{js,coffee}'], ['scripts', reload]);
  gulp.watch(['app/static/images/**/*'], reload);
});


// Run PageSpeed Insights
gulp.task('pagespeed', function (cb) {
  // Update the below URL to the public URL of your site
  pagespeed.output('example.com', {
    strategy: 'mobile',
    // By default we use the PageSpeed Insights free (no API key) tier.
    // Use a Google Developer API key if you have one: http://goo.gl/RkN0vE
    // key: 'YOUR_API_KEY'
  }, cb);
});

// Load custom tasks from the `tasks` directory
// try { require('require-dir')('tasks'); } catch (err) { console.error(err); }

package.json

{
  "devDependencies": {
    "browser-sync": "^2.2.1",
    "del": "^1.1.1",
    "gulp": "^3.8.11",
    "gulp-autoprefixer": "^2.1.0",
    "gulp-cache": "^0.2.8",
    "gulp-changed": "^1.1.1",
    "gulp-coffee": "^2.3.1",
    "gulp-coffeelint": "^0.4.0",
    "gulp-concat": "^2.5.2",
    "gulp-csso": "^1.0.0",
    "gulp-flatten": "0.0.4",
    "gulp-if": "^1.2.5",
    "gulp-imagemin": "^2.2.1",
    "gulp-jshint": "^1.9.2",
    "gulp-load-plugins": "^0.8.1",
    "gulp-minify-html": "^1.0.0",
    "gulp-rename": "^1.2.0",
    "gulp-replace": "^0.5.3",
    "gulp-sass": "^1.3.3",
    "gulp-size": "^1.2.1",
    "gulp-sourcemaps": "^1.5.0",
    "gulp-uglify": "^1.1.0",
    "gulp-uncss": "^1.0.0",
    "gulp-useref": "^1.1.1",
    "gulp-util": "^3.0.4",
    "jshint-stylish": "^1.0.1",
    "node-notifier": "^4.1.2",
    "opn": "^1.0.1",
    "psi": "^1.0.6",
    "require-dir": "^0.1.0",
    "run-sequence": "^1.0.2"
  },
  "engines": {
    "node": ">=0.10.0"
  },
  "private": true,
  "scripts": {
    "test": "gulp && git status | grep 'working directory clean' >/dev/null || (echo 'Please commit all changes generated by building'; exit 1)"
  }
}

This is excellent. For the 'runserver' task, you could do something like this so that you get your usual console and request logs:

    var proc = exec(cmd+' && PYTHONUNBUFFERED=1 python manage.py runserver');

    proc.stderr.on('data', function(data) {
      process.stdout.write(data);
    });

    proc.stdout.on('data', function(data) {
      process.stdout.write(data);
    });