Adding current project state

config.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+type AppConfig struct {
+	Storage struct {
+		InstallDir         string `json:"install_dir"`
+		InstancesDir       string `json:"instances_dir"`
+		BackupDir          string `json:"backup_dir"`
+		ConfigTemplatesDir string `json:"config_templates_dir"`
+	} `json:"storage"`
+
+	Daemon struct {
+		UseNixOs bool `json:"use_nixos"`
+	}
+}
+
+func DefaultConfig() *AppConfig {
+	home, _ := os.UserHomeDir()
+	basePath := filepath.Join(home, ".local", "share", "vs-manager")
+
+	cfg := &AppConfig{}
+	cfg.Storage.InstallDir = filepath.Join(basePath, "installs")
+	cfg.Storage.InstancesDir = filepath.Join(basePath, "instances")
+	cfg.Storage.BackupDir = filepath.Join(basePath, "backups")
+	cfg.Storage.ConfigTemplatesDir = filepath.Join(basePath, "config_templates")
+
+	return cfg
+}
+
+func LoadOrCreateConfig(configPath string) (*AppConfig, error) {
+	if _, err := os.Stat(configPath); os.IsNotExist(err) {
+		cfg := DefaultConfig()
+
+		if err := os.MkdirAll(filepath.Dir(configPath), 0755); err != nil {
+			return nil, fmt.Errorf("Failed to create config directory: %w", err)
+		}
+
+		data, err := json.MarshalIndent(cfg, "", "  ")
+		if err != nil {
+			return nil, err
+		}
+
+		if err := os.WriteFile(configPath, data, 0644); err != nil {
+			return nil, fmt.Errorf("Failed to write config file at %s\n", configPath)
+		}
+	}
+
+	data, err := os.ReadFile(configPath)
+	if err != nil {
+		return nil, err
+	}
+
+	var cfg AppConfig
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		return nil, fmt.Errorf("Invalid JSON layout in config file: %w", err)
+	}
+
+	dirs := []string{
+		cfg.Storage.InstallDir,
+		cfg.Storage.InstancesDir,
+		cfg.Storage.BackupDir,
+		cfg.Storage.ConfigTemplatesDir,
+	}
+	for _, dir := range dirs {
+		if err := os.MkdirAll(dir, 0755); err != nil {
+			return nil, fmt.Errorf("Failed creating workspace directory %s: %w", dir, err)
+		}
+	}
+
+	return &cfg, nil
+}