send back custom error

README.md

@@ -1,6 +1,6 @@
 # JETY
 
-JSON, ENV, YAML, TOML
+JSON, ENV, TOML, YAML
 
 This is a package for collapsing multiple configuration stores (env+json, env+yaml, env+toml) and writing them back to a centralized config.
 

jety.go

@@ -175,11 +175,15 @@ func (c *ConfigManager) ReadInConfig() error {
 		conf[lower] = ConfigMap{Key: k, Value: v}
 	}
 	c.mapConfig = conf
+	c.collapse()
 	return nil
 }
 
 func readFile(filename string, fileType configType) (map[string]any, error) {
 	fileData := make(map[string]any)
+	if _, err := os.Stat(filename); os.IsNotExist(err) {
+		return nil, ErrConfigFileNotFound
+	}
 	switch fileType {
 	case ConfigTypeTOML:
 		_, err := toml.DecodeFile(filename, &fileData)

setters.go

@@ -34,9 +34,13 @@ func (c *ConfigManager) SetDefault(key string, value any) {
 	lower := strings.ToLower(key)
 	c.defaultConfig[lower] = ConfigMap{Key: key, Value: value}
 	if _, ok := c.mapConfig[lower]; !ok {
-		if envVal, ok := c.envConfig[lower]; !ok {
+		if envVal, ok := c.envConfig[lower]; ok {
 			c.mapConfig[lower] = envVal
 			c.combinedConfig[lower] = envVal
+		} else {
+			c.combinedConfig[lower] = ConfigMap{Key: key, Value: value}
 		}
+	} else {
+		c.combinedConfig[lower] = c.mapConfig[lower]
 	}
 }