Add ability to list all tasks along with line number. Add ability to delete task based on line number.

godo.go

@@ -4,6 +4,7 @@ import (
 	"encoding/csv"
 	"fmt"
 	"os"
+	"strconv"
 )
 
 func main() {
@@ -12,20 +13,29 @@ func main() {
 		fmt.Println("Use godo ? or help for the help menu")
 		os.Exit(0)
 	}
+
 	switch args[1] {
 	case "?", "help":
 		help()
 	case "a", "add":
 		add(args[2])
+	case "l", "list":
+		list()
+	case "d", "delete":
+		delete(args[2])
 	}
+
 }
 
+// List all available commands
 func help() {
 	fmt.Println("?/help - help menu")
-	fmt.Println("a/add - add new task")
-	fmt.Println("l/list - add new task")
+	fmt.Println("a/add - add new task. Must be in quotations")
+	fmt.Println("d/delete - delete task")
+	fmt.Println("l/list - list all tasks")
 }
 
+// Add new task
 func add(task string) {
 	file, err := os.OpenFile("tasks.csv", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
 	if err != nil {
@@ -40,3 +50,71 @@ func add(task string) {
 	taskWrite = append(taskWrite, task)
 	writer.Write(taskWrite)
 }
+
+// List all current tasks
+func list() {
+	file, err := os.Open("tasks.csv")
+	if err != nil {
+		fmt.Printf("Error: %v", err)
+	}
+
+	defer file.Close()
+	if err != nil {
+		fmt.Printf("Error: %v", err)
+	}
+
+	reader := csv.NewReader(file)
+	records, err := reader.ReadAll()
+
+	if err != nil {
+		fmt.Printf("Error: %v", err)
+	}
+	x := 1
+	for _, record := range records {
+
+		fmt.Printf("%x - %s\n", x, record[0])
+		x += 1
+	}
+}
+
+// Delete the requested task
+func delete(task string) {
+
+	fileName := "tasks.csv"
+
+	// Convert arg to int
+	taskInt, err := strconv.Atoi(task)
+	if err != nil {
+		fmt.Println("error")
+	}
+
+	//open the task csv
+	file, err := os.Open(fileName)
+	if err != nil {
+		fmt.Printf("Error: %v", err)
+	}
+
+	defer file.Close()
+	if err != nil {
+		fmt.Printf("Error: %v", err)
+	}
+	//read the file
+	reader := csv.NewReader(file)
+	records, err := reader.ReadAll()
+
+	if err != nil {
+		fmt.Printf("Error: %v", err)
+	}
+	//close file and delete
+	file.Close()
+	os.Remove(fileName)
+	//check if the arg number is equal to the csv line number. If not pass it to the add function to readd it
+	x := 1
+	for _, record := range records {
+		if x != taskInt {
+			add(record[0])
+		}
+		x += 1
+	}
+
+}