Apl Todo berasaskan CLI

Pasang Pustaka Luar yang digunakan

pergi dapatkan github.com/aquasecurity/table

Struktur direktori

main.go

package main

func main() {
    todos := Todos{}

    storage := NewStorage[Todos]("todos.json")
    storage.Load(&todos)

    CmdFlags := NewCmdflags()
    CmdFlags.Execute(&todos)

    storage.Save(todos)
}

1. Mencipta sekeping nama struktur Todos
2. Buat memori dinamik untuk todos sedia ada dalam sistem secara setempat dalam fail "todo.json" yang telah dibuat sebelum ini dengan storan. Simpan
3. Jika tidak, ia akan dimuatkan sebagai kosong
4. Menghuraikan dan mengesahkan bendera arahan yang disediakan oleh pengguna
5. Laksanakan berdasarkan bendera yang disediakan

Pelaksanaan fungsi

package main

import (
    "errors"
    "fmt"
    "os"
    "strconv"
    "time"

    "github.com/aquasecurity/table"
)

type Todo struct {
    Title     string
    Completed bool
    CreatedAt time.Time
    // this field here is a pointer reference because it can be null
    CompletedAt *time.Time
}

// a slice(array) of Todo
type Todos []Todo

// Passing Todo slice here as a reference
// declares a parameter named todos that is a pointer to a Todos slice.
// the function receives a copy of the slice under the name todos
func (todos *Todos) add(title string) {
    todo := Todo{
        Title:       title,
        Completed:   false,
        CompletedAt: nil,
        CreatedAt:   time.Now(),
    }
    *todos = append(*todos, todo)

}

func (todos *Todos) validateIndex(index int) error {
    if index < 0 || index >= len(*todos) {
        err := errors.New("invalid index")
        fmt.Println(err)
    }
    return nil
}

func (todos *Todos) delete(index int) error {
    t := *todos

    if err := t.validateIndex(index); err != nil {
        return err
    }

    *todos = append(t[:index], t[index+1:]...)

    return nil
}

func (todos *Todos) toggle(index int) error {
    t := *todos

    if err := t.validateIndex(index); err != nil {
        return err
    }

    isCompleted := t[index].Completed

    if !isCompleted {
        completionTime := time.Now()
        t[index].CompletedAt = &completionTime
    }

    t[index].Completed = !isCompleted

    return nil
}

func (todos *Todos) edit(index int, title string) error {
    t := *todos

    if err := t.validateIndex(index); err != nil {
        return err
    }

    t[index].Title = title

    return nil
}

func (todos *Todos) print() {
    table := table.New(os.Stdout)
    table.SetRowLines(false)
    table.SetHeaders("#", "Title", "Status", "Created", "Completed")

    for index, t := range *todos {
        mark := "❌"
        completedAt := ""

        if t.Completed {
            mark = "✅"
            if t.CompletedAt != nil {
                completedAt = t.CompletedAt.Format(time.RFC1123)
            }
        }
        table.AddRow(strconv.Itoa(index), t.Title, mark, t.CreatedAt.Format(time.RFC1123), completedAt)
    }

    table.Render()
}

Pelaksanaan storan

package main

import (
    "encoding/json"
    "os"
)

type Storage[T any] struct {
    FileName string
}

func NewStorage[T any](filename string) *Storage[T] {
    return &Storage[T]{FileName: filename}
}

func (s *Storage[T]) Save(data T) error {
    fileData, err := json.MarshalIndent(data, "", "\t")

    if err != nil {
        return err
    }

    return os.WriteFile(s.FileName, fileData, 0644)

}

func (s *Storage[T]) Load(data *T) error {
    fileData, err := os.ReadFile(s.FileName)

    if err != nil {
        return err
    }

    return json.Unmarshal(fileData, data)
}

Pengesahan dan Pelaksanaan Bendera Baris Perintah

package main

import (
    "flag"
    "fmt"
    "os"
    "strconv"
    "strings"
)

type CmdFlags struct {
    Help   bool
    Add    string
    Del    int
    Edit   string
    Update int
    List   bool
}

func NewCmdflags() *CmdFlags {
    cf := CmdFlags{}

    flag.BoolVar(&cf.Help, "help", false, "List existing commands")
    flag.StringVar(&cf.Add, "add", "", "Add a new todo specify title")
    flag.StringVar(&cf.Edit, "edit", "", "Edit an existing todo, enter #index and specify a new title. \"id:new title\"")
    flag.IntVar(&cf.Del, "del", -1, "Specify a todo by #index to delete")
    flag.IntVar(&cf.Update, "update", -1, "Specify a todo #index to update")
    flag.BoolVar(&cf.List, "list", false, "List all todos")

    for _, arg := range os.Args[1:] {
        if strings.HasPrefix(arg, "-") && !isValidFlag(arg) {
            fmt.Printf("Unknown flag: %s\n", arg)
            fmt.Println("try --help to know more")

            os.Exit(0)
        }
    }

    flag.Parse()
    return &cf
}

func isValidFlag(flag string) bool {

    validFlags := []string{
        "-help", "--help",
        "-add", "--add",
        "-edit", "--edit",
        "-del", "--del",
        "-update", "--update",
        "-list", "--list",
    }

    if idx := strings.Index(flag, "="); idx != -1 {
        flag = flag[:idx]
    }

    for _, validFlag := range validFlags {
        if flag == validFlag {
            return true
        }
    }

    return false
}

func (cf *CmdFlags) Execute(todos *Todos) {
    switch {
    case cf.List:
        todos.print()

    case cf.Add != "":
        todos.add(cf.Add)

    case cf.Edit != "":
        parts := strings.SplitN(cf.Edit, ":", 2)
        if len(parts) != 2 {
            fmt.Printf("Error, invalid format for edit.\nCorrect Format: \"id:new title\" ")
            os.Exit(1)
        }

        index, err := strconv.Atoi(parts[0])

        if err != nil {
            fmt.Printf("Error, Invalid index for edit")
            os.Exit(1)
        }

        todos.edit(index, parts[1])

    case cf.Update != -1:
        todos.toggle(cf.Update)

    case cf.Del != -1:
        todos.delete(cf.Del)

    case cf.Help:
        fmt.Println("usage:")
        fmt.Println("--help\t\t| List existing commands")
        fmt.Println("--add\t\t| Add new task")
        fmt.Println("--del\t\t| Delete an existing task")
        fmt.Println("--update\t| Check/Uncheck existing task")
        fmt.Println("--edit\t\t| Edit an existing task")
    }
}

Github Repo: CLI Todo App

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