structs

structs-practice/go.mod

@@ -0,0 +1,3 @@
+module example.com/note
+
+go 1.23.1

structs-practice/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"example.com/note/note"
+	"os"
+	"strings"
+)
+
+func main() {
+	title, content := getNoteData()
+
+	userNote, err := note.New(title, content)
+
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	userNote.Display()
+	err = userNote.Save()
+
+	if err != nil {
+		fmt.Println("Saving the note failed")
+		return
+	}
+
+	fmt.Println("Saving the note succeeded!")
+}
+
+func getNoteData() (string, string) {
+	title := getUserInput("Note title:")
+
+	content := getUserInput("Note content:")
+
+	return title, content
+}
+
+func getUserInput(prompt string) (string) {
+	fmt.Printf("%v ", prompt)
+	
+	reader := bufio.NewReader(os.Stdin)
+
+	text, err :=reader.ReadString('\n')
+
+	if err != nil {
+		return ""
+	}
+
+	text = strings.TrimSuffix(text, "\n")
+	text = strings.TrimSuffix(text, "\r")
+
+	return text
+}

structs-practice/note/note.go

@@ -0,0 +1,45 @@
+package note
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+)
+
+type Note struct {
+	Title string `json:"title"`
+	Content string `json:"content"`
+	CreatedAt time.Time `json:"created_at"`
+}
+
+func (note Note) Display() {
+	fmt.Printf("Your note title %v has the following content:\n\n%v", note.Title, note.Content)
+}
+
+func (note Note) Save() error {
+	fileName := strings.ReplaceAll(note.Title, " ", "_")
+	fileName = strings.ToLower(fileName) + ".json"
+
+	json, err := json.Marshal(note)
+
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(fileName, json, 0644)
+}
+
+func New(title, content string) (Note, error) {
+	if title == "" || content == "" {
+		return Note{}, errors.New("Invalid input")
+	}
+
+	return Note{
+		Title: title,
+		Content: content,
+		CreatedAt: time.Now(),
+	}, nil
+}