added SPM

spm/utils.go

@@ -0,0 +1,64 @@
+package spm
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+)
+
+func GetTempDownloadDir() string {
+	dir, err := os.MkdirTemp("", "spm_downloads")
+	if err != nil {
+		panic(err)
+	}
+	return dir
+}
+
+func SetDownloadFolder(customDir string) (string, error) {
+	if err := os.MkdirAll(customDir, os.ModePerm); err != nil {
+		return "", err
+	}
+	return customDir, nil
+}
+
+// GetDefaultInstallDir generates the default installation directory based on the OS and environment.
+func GetDefaultInstallDir() (string, error) {
+	var installDir string
+
+	switch runtime.GOOS {
+	case "windows":
+		// Use %APPDATA% or Program Files on Windows
+		appData := os.Getenv("APPDATA")
+		if appData != "" {
+			installDir = filepath.Join(appData, "Spitfire")
+		} else {
+			programFiles := os.Getenv("ProgramFiles")
+			if programFiles == "" {
+				return "", fmt.Errorf("unable to determine default install directory on Windows")
+			}
+			installDir = filepath.Join(programFiles, "Spitfire")
+		}
+
+	case "darwin":
+		// Use ~/Library/Application Support on macOS
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			return "", fmt.Errorf("unable to determine home directory on macOS: %w", err)
+		}
+		installDir = filepath.Join(homeDir, "Library", "Application Support", "Spitfire")
+
+	case "linux":
+		// Use ~/.local/share or /opt on Linux
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			return "", fmt.Errorf("unable to determine home directory on Linux: %w", err)
+		}
+		installDir = filepath.Join(homeDir, ".local", "share", "Spitfire")
+
+	default:
+		return "", fmt.Errorf("unsupported operating system: %s", runtime.GOOS)
+	}
+
+	return installDir, nil
+}