add prompts for add cmd

cmd/dsnet.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"os"
-	"flag"
 	"fmt"
 	"github.com/naggie/dsnet"
 )
@@ -10,14 +9,6 @@ import (
 func main() {
 	var cmd string
 
-	addCmd := flag.NewFlagSet("add", flag.ExitOnError)
-	hostname := addCmd.String("hostname", "", "Hostname of device")
-	owner := addCmd.String("owner", "", "Username of owner of device")
-	description := addCmd.String("description", "", "Information about device")
-	publicKey := addCmd.String("publicKey", "", "Optional existing public key of device")
-
-
-
 	if len(os.Args) == 1 {
 		cmd = "help"
 	} else {
@@ -29,9 +20,15 @@ func main() {
 		dsnet.Init()
 
 	case "add":
-		addCmd.PrintDefaults()
-		addCmd.Parse(os.Args[2:])
-		dsnet.Add(*hostname, *owner, *description, *publicKey)
+		// TODO maybe accept flags to avoid prompt and allow programmatic use
+		hostname := dsnet.MustPromptString("Hostname", true)
+		owner := dsnet.MustPromptString("owner", true)
+		description := dsnet.MustPromptString("Description", true)
+		publicKey := dsnet.MustPromptString("PublicKey (optional)", false)
+
+		dsnet.ConfirmOrAbort("\nDo you want to add the above configuration?")
+
+		dsnet.Add(hostname, owner, description, publicKey)
 
 	case "up":
 

util.go

@@ -1,7 +1,50 @@
 package dsnet
 
+import (
+	"os"
+	"bufio"
+	"strings"
+	"fmt"
+)
+
 func check(e error) {
     if e != nil {
         panic(e)
     }
 }
+
+func MustPromptString(prompt string, required bool) string {
+	reader := bufio.NewReader(os.Stdin)
+	var text string
+	var err error
+
+	for text == "" {
+		fmt.Printf("%s: ", prompt)
+		text, err = reader.ReadString('\n')
+		check(err)
+		text = strings.TrimSpace(text)
+	}
+	return text
+}
+
+func ExitFail(format string, a ...interface{}) {
+	fmt.Fprintf(os.Stderr, "\033[31m"+format+"\033[0m\n", a...)
+	os.Exit(1)
+}
+
+func ConfirmOrAbort(format string, a ...interface{}) {
+	fmt.Fprintf(os.Stderr, format+" [y/n] ", a...)
+
+	reader := bufio.NewReader(os.Stdin)
+
+	input, err := reader.ReadString('\n')
+	if err != nil {
+		panic(err)
+	}
+
+	if input == "y\n" {
+		return
+	} else {
+		ExitFail("Aborted.")
+	}
+}