fix nil map

envconf.go

@@ -48,6 +48,9 @@ func NewConfig() *Config {
 			}
 
 			if unicode.IsLetter(getFirstRune(key)) {
+				if len(config.mapEnv[left]) == 0 {
+					config.mapEnv[left] = make(map[string]cEntry)
+				}
 				var entry cEntry
 				entry.value = splitted[1]
 				entry.dtype = TypeNone
@@ -81,8 +84,8 @@ func (c *Config) Define(key string, dtype DataType) {
 // Define the type of an environment variable.
 // Variables without a defined type will be ignored by Parse.
 func (c *Config) DefineMap(key string, dtype DataType) {
-	upper := strings.ToUpper(key)
-	entries, ok := c.mapEnv[upper]
+	key = cleanKey(key)
+	entries, ok := c.mapEnv[key]
 	if ok {
 		for mapKey, entry := range entries {
 			entry.dtype = dtype