feat: v0.1.1, support version and readonly

.gitignore

@@ -1,3 +1,5 @@
+secure-editor-go
+
 # ---> macOS
 # General
 .DS_Store

main.go

@@ -15,8 +15,9 @@ import (
 )
 
 const (
-	AlgorithmAes256Gcm = "aes-256-gcm"
+	Version            = "0.1.1"
 	Title              = "Secure Editor"
+	AlgorithmAes256Gcm = "aes-256-gcm"
 )
 
 func decrypt(ciphertext, key, nonce []byte) ([]byte, error) {
@@ -69,8 +70,17 @@ func showErrorMessage(err error, parent fyne.Window) {
 	dialog.ShowError(err, parent)
 }
 
+func isReadonly() bool {
+	return os.Getenv("READONLY") == "true"
+}
+
 func main() {
 	args := os.Args
+	if len(args) == 2 && args[1] == "version" {
+		fmt.Printf("secure-editor-go version: %s\n", Version)
+		os.Exit(0)
+	}
+
 	if len(args) != 5 {
 		fmt.Printf("Bad encrypt args: %v\n", args)
 		os.Exit(1)
@@ -113,6 +123,8 @@ func main() {
 		os.Exit(1)
 	}
 
+	isReadonly := isReadonly()
+
 	secureEditorApp := app.New()
 	window := secureEditorApp.NewWindow(Title)
 	window.Resize(fyne.NewSize(800, 600))
@@ -123,7 +135,16 @@ func main() {
 	textEntry := widget.NewMultiLineEntry()
 	textEntry.Wrapping = fyne.TextWrapWord
 
-	textEntry.SetText(string(plaintext))
+	initialText := string(plaintext)
+	textEntry.SetText(initialText)
+	if isReadonly {
+		// textEntry.Disable() // TODO for font is grey
+		textEntry.OnChanged = func(text string) {
+			if text != initialText {
+				textEntry.SetText(initialText)
+			}
+		}
+	}
 
 	exitButton := widget.NewButton(" [ Exit ] ", func() {
 		secureEditorApp.Quit()
@@ -143,9 +164,14 @@ func main() {
 		secureEditorApp.Quit()
 	})
 
+	buttons := container.NewHBox(exitButton, saveButton)
+	if isReadonly {
+		buttons = container.NewHBox(exitButton)
+	}
+
 	content := container.NewBorder(
 		nil, // top
-		container.NewBorder(nil, nil, nil, container.NewHBox(exitButton, saveButton), nil), // bottom
+		container.NewBorder(nil, nil, nil, buttons, nil), // bottom
 		nil,       // left
 		nil,       // right
 		textEntry, // center