added tui

main.go

@@ -6,16 +6,17 @@ import (
 	"os"
 	"strconv"
 	"strings"
+
+	"github.com/pterm/pterm"
 )
 
 func main() {
-
-	fmt.Println("Welcome to Checkdigit Calculator")
+	pterm.DefaultHeader.Println("Welcome to Checkdigit Calculator")
 
 	directory, err := os.Getwd()
 	Error(err)
 
-	fmt.Printf("What is the name of the file in this directory?: ")
+	pterm.DefaultBasicText.Printf("What is the name of the file in this directory?: ")
 	reader := bufio.NewReader(os.Stdin)
 	input, err := reader.ReadString('\n')
 	Error(err)
@@ -34,6 +35,10 @@ func main() {
 		fmt.Println(scanner.Err())
 	}
 
+	upcProgressbar, err := pterm.DefaultProgressbar.WithTotal(len(upcs)).WithTitle("Processing UPCs").Start()
+
+	Error(err)
+
 	var gtins []string
 
 	for _, upc := range upcs {
@@ -101,8 +106,11 @@ func main() {
 		remainderString := strconv.Itoa(remainder)
 
 		gtins = append(gtins, upc+remainderString)
+		upcProgressbar.Increment()
 	}
 
+	answerProgressbar, err := pterm.DefaultProgressbar.WithTotal(len(gtins)).WithTitle("Processing UPCs").Start()
+
 	if _, err := os.Stat(directory + "/answer.txt"); err == nil {
 		e := os.Remove(directory + "/answer.txt")
 		Error(e)
@@ -116,7 +124,8 @@ func main() {
 	for _, gtin := range gtins {
 		_, err := answerFile.WriteString(gtin + "\n")
 		Error(err)
+		answerProgressbar.Increment()
 	}
 
-	fmt.Println("The answer.txt file has been successfully generated with check digits.")
+	pterm.DefaultBasicText.Println("The answer.txt file has been successfully generated with check digits.")
 }