Initial Code

main.go

@@ -0,0 +1,164 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+)
+
+var fileName = "todos.json"
+
+type Todo struct {
+	Id          int    `json:"id"`
+	Title       string `json:"title"`
+	Description string `json:"description"`
+	Completed   bool   `json:"completed"`
+}
+
+func printTodo(todo Todo) {
+	fmt.Println("- ID: ", todo.Id)
+	fmt.Println("- Title: ", todo.Title)
+	fmt.Println("- Description: ", todo.Description)
+	fmt.Println("- Completed: ", todo.Completed)
+	fmt.Println("--------")
+}
+
+func listTodos() {
+	todos := getAllTodos()
+	fmt.Println("TODO: \n------")
+	for _, todo := range todos {
+		if todo.Completed {
+			continue
+		}
+		printTodo(todo)
+	}
+	fmt.Println("\nCompleted: \n------")
+	for _, todo := range todos {
+		if !todo.Completed {
+			continue
+		}
+		printTodo(todo)
+	}
+
+}
+
+func checkFile() {
+	_, err := os.Stat(fileName)
+	if os.IsNotExist(err) {
+		_, err := os.Create(fileName)
+		if err != nil {
+			log.Fatal("\n Error creating file: ", err)
+		}
+	}
+}
+
+func saveTodoList(todos []Todo) {
+	writeBytes, err := json.Marshal(todos)
+	if err != nil {
+		log.Fatal("There was a problem:", err)
+	}
+	os.WriteFile(fileName, writeBytes, 0666)
+}
+
+func getAllTodos() []Todo {
+	checkFile()
+	fileData, err := os.ReadFile(fileName)
+	if err != nil {
+		saveTodoList([]Todo{})
+	}
+	todos := []Todo{}
+	if err := json.Unmarshal(fileData, &todos); err != nil {
+		saveTodoList([]Todo{})
+	}
+	return todos
+}
+
+func completeTodo(id int) {
+	todos := getAllTodos()
+	for i, todo := range todos {
+		if todo.Id == id {
+			todo.Completed = true
+			todos[i] = todo
+			break
+		}
+	}
+	saveTodoList(todos)
+}
+
+func removeTodo(id int) {
+	todos := getAllTodos()
+	for i, todo := range todos {
+		if todo.Id == id {
+			todos = append(todos[:i], todos[i+1:]...)
+			break
+		}
+	}
+	saveTodoList(todos)
+}
+
+func getNextId() int {
+	todos := getAllTodos()
+	maxId := 0
+	for _, todo := range todos {
+		if todo.Id > maxId {
+			maxId = todo.Id
+		}
+	}
+	return maxId + 1
+}
+
+func addTodo(todo Todo) {
+	todos := getAllTodos()
+	todo.Id = getNextId()
+	todo.Completed = false
+	todos = append(todos, todo)
+	writeBytes, err := json.Marshal(todos)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if err := os.WriteFile(fileName, writeBytes, 0666); err != nil {
+		log.Fatal("There was an error writing the todo to the file", err)
+	}
+}
+
+var (
+	action      *string
+	title       *string
+	description *string
+	id          *int
+)
+
+func init() {
+	action = flag.String("action", "add", "action (add, remove, list, complete)")
+	title = flag.String("title", "", "title of the todo")
+	description = flag.String("description", "", "description of the todo")
+	id = flag.Int("id", 0, "ID of the todo to be actioned upon. Used for remove and complete")
+
+}
+func main() {
+	flag.Parse()
+
+	if *action == "add" {
+		if *title == "" || *description == "" {
+			log.Fatal("Title and Description must be provided for adding a new TODO")
+		}
+		addTodo(Todo{Title: *title, Description: *description})
+	} else if *action == "remove" {
+		if *id == 0 {
+			log.Fatal("ID must be provided for removing a TODO")
+		}
+		removeTodo(*id)
+	} else if *action == "complete" {
+		if *id == 0 {
+			log.Fatal("ID must be provided for marking a Todo as complete")
+		}
+		completeTodo(*id)
+	} else if *action == "list" {
+		listTodos()
+	} else {
+		log.Fatal("Please input a valid action.")
+	}
+
+}