Refactored, added comprehensive testing.

config/file.go

@@ -0,0 +1,44 @@
+package config
+
+import (
+	"gopkg.in/yaml.v3"
+	"os"
+)
+
+func loadConfigFile(path string) (fileValues, error) {
+	if path == "" {
+		return fileValues{}, nil
+	}
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return fileValues{}, err
+	}
+
+	var raw map[string]interface{}
+	if err := yaml.Unmarshal(data, &raw); err != nil {
+		return fileValues{}, err
+	}
+
+	fv := fileValues{}
+	if v, ok := raw["protocol"].(string); ok {
+		fv.protocol = v
+	}
+	if v, ok := raw["url"].(string); ok {
+		fv.url = v
+	}
+	if v, ok := raw["key_file"].(string); ok {
+		fv.keyFile = v
+	}
+	if v, ok := raw["model"].(string); ok {
+		fv.model = v
+	}
+	if v, ok := raw["fallback"].(string); ok {
+		fv.fallback = v
+	}
+	if v, ok := raw["system_file"].(string); ok {
+		fv.systemFile = v
+	}
+
+	return fv, nil
+}