var Seq = require('seq');
var fs = require('fs');

Seq()
    .seq(function() {
        fs.stat('./dir', this);
    })
    .catch(function (err) {
        fs.mkdir('./dir', 0700, function (err) {
            if (err) {
                console.log("Couldn't mkdir ./dir: " + err);
                process.exit(1);
            }
        });
    })
    .seq(function () {
        fs.open('./dir/file', 'a+', this.into('fd'));
    })
    .catch(function (err) {
        console.log("Couldn't open file for appending: " + err);
        process.exit(1);
    })
    .seq(function () {
        var towrite = Buffer("hello world\n");
        fs.write(this.vars.fd, towrite, 0, towrite.length, null, this)
    })
    .catch(function (err) {
        console.log("Failed appending to file: " + err);
        process.exit(1);
    })
    .seq(function () {
        console.log("Successfully appended to file!");
    })
;