update config when exit

config.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	config "github.com/spf13/viper"
 	"os"
 )
 
@@ -27,7 +26,7 @@ func configInit() {
 		if _, err = os.Stat(defaultConfigPath); os.IsNotExist(err) {
 			os.Mkdir(defaultConfigPath, os.ModePerm)
 		}
-		config.SafeWriteConfig();
+		config.SafeWriteConfig()
 	}
 
 	// setup
@@ -36,3 +35,28 @@ func configInit() {
 	translator.src_lang = config.GetString("source_language")
 	translator.dst_lang = config.GetString("destination_language")
 }
+
+func updateConfig() {
+	changed := false
+
+	if config.GetString("theme") != theme {
+		changed = true
+		config.Set("theme", theme)
+	}
+	if config.GetBool("transparent") != transparent {
+		changed = true
+		config.Set("transparent", transparent)
+	}
+	if config.GetString("source_language") != translator.src_lang {
+		changed = true
+		config.Set("source_language", translator.src_lang)
+	}
+	if config.GetString("destination_language") != translator.dst_lang {
+		changed = true
+		config.Set("destination_language", translator.dst_lang)
+	}
+
+	if changed {
+		config.WriteConfig()
+	}
+}

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"github.com/rivo/tview"
+	"github.com/spf13/viper"
 )
 
 var (
@@ -18,6 +19,7 @@ var (
 	pages          = tview.NewPages()
 	window         Window
 	// config
+	config      = viper.New()
 	theme       string
 	transparent bool
 )
@@ -47,4 +49,6 @@ func main() {
 		EnableMouse(true).Run(); err != nil {
 		panic(err)
 	}
+
+	defer updateConfig()
 }