Add read config from file

README.md

@@ -173,6 +173,7 @@ Application Options:
                               delayed for a hard-coded period of 3 minutes. Can be specified multiple times.
       --verbose               Verbose output (optional)
       --output=               Path to the log file. If not set, write to stdout.
+      --config=               Path to the config file.
 
 Help Options:
   -h, --help                  Show this help message

internal/cmd/cmd.go

@@ -26,6 +26,9 @@ func Main() {
 	options := &Options{}
 	parser := goFlags.NewParser(options, goFlags.Default)
 	_, err := parser.Parse()
+	if err == nil && options.ConfigFile != "" {
+		err = goFlags.IniParse(options.ConfigFile, options)
+	}
 	if err != nil {
 		if flagsErr, ok := err.(*goFlags.Error); ok && flagsErr.Type == goFlags.ErrHelp {
 			os.Exit(0)

internal/cmd/options.go

@@ -85,6 +85,9 @@ type Options struct {
 
 	// LogOutput is the optional path to the log file.
 	LogOutput string `long:"output" description:"Path to the log file. If not set, write to stdout."`
+
+	// ConfigFile is the optional path to the config file.
+	ConfigFile string `long:"config" description:"Path to the config file."`
 }
 
 // String implements fmt.Stringer interface for Options.