add parser

internal/config/config.go

@@ -0,0 +1,37 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+)
+
+const (
+	ClientPort = ":8100"
+	FilePort   = ":8120"
+)
+
+func GetScheduleFilepath() string {
+	return getFilepath("SCHEDULE_FILENAME", "data/schedule.json")
+}
+
+func getFilepath(env string, defaultFilepath string) string {
+	filepath := selectFilepath(env, defaultFilepath)
+	ensureDirExists(filepath)
+	return filepath
+}
+
+func selectFilepath(env string, defaultFilepath string) string {
+	filepath := os.Getenv(env)
+	if filepath != "" {
+		return filepath
+	}
+	return defaultFilepath
+}
+
+func ensureDirExists(filePath string) error {
+	dir := filepath.Dir(filePath)
+	if dir == "" || dir == "." || dir == "/" {
+		return nil
+	}
+	return os.MkdirAll(dir, 0755)
+}