Add path mapping for OpenLocation

internal/config/config.go

@@ -0,0 +1,87 @@
+package config
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+const appName = "luxtools-client"
+
+// Config stores client configuration loaded from disk.
+type Config struct {
+	PathMap map[string]string `json:"path_map"`
+}
+
+// ConfigPath returns the full path to the config.json file.
+func ConfigPath() (string, error) {
+	dir, err := configDir()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(dir, "config.json"), nil
+}
+
+func configDir() (string, error) {
+	if dir, err := os.UserConfigDir(); err == nil && strings.TrimSpace(dir) != "" {
+		return filepath.Join(dir, appName), nil
+	}
+
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return "", err
+	}
+
+	switch runtime.GOOS {
+	case "windows":
+		if v := strings.TrimSpace(os.Getenv("APPDATA")); v != "" {
+			return filepath.Join(v, appName), nil
+		}
+		return filepath.Join(home, "AppData", "Roaming", appName), nil
+	case "darwin":
+		return filepath.Join(home, "Library", "Application Support", appName), nil
+	default:
+		return filepath.Join(home, ".config", appName), nil
+	}
+}
+
+// Load reads the config from disk. If the file does not exist, it returns an empty config.
+func Load(path string) (Config, error) {
+	cfg := Config{PathMap: map[string]string{}}
+
+	b, err := os.ReadFile(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return cfg, nil
+		}
+		return cfg, err
+	}
+	if len(b) == 0 {
+		return cfg, nil
+	}
+
+	if err := json.Unmarshal(b, &cfg); err != nil {
+		return cfg, err
+	}
+	if cfg.PathMap == nil {
+		cfg.PathMap = map[string]string{}
+	}
+	return cfg, nil
+}
+
+// Save writes the config to disk.
+func Save(path string, cfg Config) error {
+	if cfg.PathMap == nil {
+		cfg.PathMap = map[string]string{}
+	}
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		return err
+	}
+	b, err := json.MarshalIndent(cfg, "", "  ")
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(path, b, 0o644)
+}