refactor the rehash implementation

irc/config.go

@@ -244,6 +244,8 @@ type Config struct {
 		WhowasEntries  uint          `yaml:"whowas-entries"`
 		LineLen        LineLenConfig `yaml:"linelen"`
 	}
+
+	Filename string
 }
 
 // OperClass defines an assembled operator class.
@@ -390,6 +392,8 @@ func LoadConfig(filename string) (config *Config, err error) {
 		return nil, err
 	}
 
+	config.Filename = filename
+
 	// we need this so PasswordBytes returns the correct info
 	if config.Server.Password != "" {
 		config.Server.PassConfig.Password = config.Server.Password