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

🤖

internal/helper/files.go

@@ -10,15 +10,25 @@ import (
 	ChronoTomato "git.smsvc.net/pomodoro/ChronoTomato/pkg/models"
 )
 
-func ParseConfig(filename string) ChronoTomato.Config {
-	var config ChronoTomato.Config
-
+func expandUnixPath(filename string) string {
 	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)
 	}