Add GetEnv function and key field to OptionalItem

cfger.go

@@ -71,7 +71,7 @@ func (cl *ConfigLoader) Get(key string) OptionalItem {
 
 		item, found := cursor.(map[string]any)[key]
 		if !found {
-			return OptionalItem{nil, false}
+			return OptionalItem{key, nil, false}
 		}
 
 		if isIndexed {
@@ -84,7 +84,19 @@ func (cl *ConfigLoader) Get(key string) OptionalItem {
 			cursor = item
 		}
 	}
-	return OptionalItem{cursor, true}
+	return OptionalItem{key, cursor, true}
+}
+
+func (cl *ConfigLoader) GetEnv(envKey string) OptionalItem {
+	cl.lastKey = envKey
+
+	ev := os.Getenv(envKey)
+
+	if ev == "" {
+		return OptionalItem{envKey, nil, false}
+	}
+
+	return OptionalItem{envKey, ev, true}
 }
 
 // Required gets a given key from the currently loaded configuration and raises

types.go

@@ -1,6 +1,7 @@
 package cfger
 
 type OptionalItem struct {
+	key   string
 	item  any
 	found bool
 }