Graphviz dot to png using Gulp

gulpfile.js

var gulp  = require('gulp')
var spawn = require('gulp-spawn')

gulp.task('dot', function() {
	return gulp.src('*.dot')
		.pipe(spawn({
			cmd: 'dot'
			, args: ['-Tpng']
			, filename: function(base, ext) {
				return base+'.png'
			}
		}))
		.pipe(gulp.dest('.'))
})

gulp.task('watch', function() {
	gulp.watch('*.dot', ['dot'])
})

gulp.task('default', ['dot'])

package.json

{
  "name": "dot-graphs",
  "version": "0.0.0",
  "description": "Dot Graphs to PNG",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": "",
  "author": "Ukabu",
  "license": "ISC",
  "devDependencies": {
    "gulp": "^3.5.2",
    "gulp-spawn": "^0.2.1"
  }
}