Use gulp to compile a coffee file

gistfile1.txt

var gulp = require('gulp');
var gutil = require('gulp-util');
var coffee = require('gulp-coffee');

gulp.task('default', function() {
 gulp.src('./src/*.coffee')
   .pipe(coffee({bare: true})
     .on('error', gutil.log))
   .pipe(gulp.dest('./'))
});

gulp.watch('src/*.coffee', ['default']);