ported fucking-coffee script to golang (#163)

go/fucking-coffee.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+	"time"
+
+	"github.com/codeskyblue/go-sh"
+	"github.com/google/goexpect"
+)
+
+func main() {
+	// exit early if no sessions with my username are found
+	currentUser, _ := sh.Command("who").Command("grep", "my_username").Output()
+	if currentUser == nil {
+		os.Exit(1)
+	}
+
+	// info about the coffee machine
+	coffeeMachineIP := "10.10.42.42"
+	password := "1234"
+	passwordPrompt := "Password: "
+	delayBeforeBrew := 17 * time.Second
+	delay := 24 * time.Second
+
+	// timeout for the telnet prompts
+	timeout := 10 * time.Minute
+
+	// sleep 17 seconds before brewing coffee
+	time.Sleep(delayBeforeBrew)
+
+	// spawn a new telnet session with the coffee machine
+	t, _, err := expect.Spawn(fmt.Sprintf("telnet %s", coffeeMachineIP), -1)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer t.Close()
+
+	t.Expect(regexp.MustCompile(passwordPrompt), timeout)
+	t.Send(password + "\n")
+	t.Expect(regexp.MustCompile("telnet>"), timeout)
+	t.Send("sys brew\n")
+	time.Sleep(delay)
+	t.Expect(regexp.MustCompile("telnet>"), timeout)
+	t.Send("sys pour\n")
+	t.Expect(regexp.MustCompile("telnet>"), timeout)
+	t.Send("exit\n")
+}