feat

- configuration

internal/config/config.go

@@ -0,0 +1,32 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+)
+
+type Config struct {
+	DBPath string
+}
+
+func NewConfig() (*Config, error) {
+	dsn, err := getDBPath()
+	if err != nil {
+		return nil, err
+	}
+
+	return &Config{DBPath: dsn}, nil
+}
+
+func getDBPath() (string, error) {
+	if dsn := os.Getenv("SPELLBOOK_DB_PATH"); dsn != "" {
+		return dsn, nil
+	}
+
+	dir, err := os.UserConfigDir()
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Join(dir, "spellbook", "spellbook.db"), nil
+}