feat: improve config file handling

- add default config file
- read passed config file or use default if none provided
- ensure cli parameters always supersede config file settings
- add function to check if a file exists

🤖

cmd/client/main.go

@@ -15,6 +15,8 @@ import (
 var (
 	config ChronoTomato.Config
 
+	defaultConfigFile = "~/.config/ChronoTomato.yml"
+
 	parameter_url      = flag.String("url", "", "GoTomato Server URL (eg ws://localhost:8080/ws)")
 	parameter_password = flag.String("password", "", "Control password for pomodoro session")
 	configfile         = flag.String("config", "", "Path to config file")
@@ -26,13 +28,21 @@ func Start() {
 	cursor.Hide()
 	defer cursor.Show()
 
-	// read cli parameters if no config file passed
+	// read passed config file or try to use default config
-	if *configfile == "" {
+	if *configfile != "" {
-		config.URL = *parameter_url
-		config.Password = *parameter_password
-	} else {
-		// otherwise read config
 		config = helper.ParseConfig(*configfile)
+	} else {
+		if helper.FileExists(defaultConfigFile) {
+			config = helper.ParseConfig(defaultConfigFile)
+		}
+	}
+
+	// cli parameters always supersede config file
+	if *parameter_url != "" {
+		config.URL = *parameter_url
+	}
+	if *parameter_password != "" {
+		config.Password = *parameter_password
 	}
 
 	client := websocket.Connect(config.URL)

internal/helper/files.go

@@ -10,15 +10,25 @@ import (
 	ChronoTomato "git.smsvc.net/pomodoro/ChronoTomato/pkg/models"
 )
 
-func ParseConfig(filename string) ChronoTomato.Config {
+func expandUnixPath(filename string) string {
-	var config ChronoTomato.Config
-
 	if strings.HasPrefix(filename, "~/") {
 		dirname, _ := os.UserHomeDir()
 		filename = filepath.Join(dirname, filename[2:])
 	}
 
-	yamlFile, err := os.ReadFile(filename)
+	return filename
+}
+
+func FileExists(filename string) bool {
+	_, err := os.Stat(expandUnixPath(filename))
+
+	return !os.IsNotExist(err)
+}
+
+func ParseConfig(filename string) ChronoTomato.Config {
+	var config ChronoTomato.Config
+
+	yamlFile, err := os.ReadFile(expandUnixPath(filename))
 	if err != nil {
 		log.Fatal("Error opening config file!", "reason", err)
 	}