feat: clean cmd to remove dangling virtualenvs

resolves: #16

cmd/clean.go

@@ -0,0 +1,57 @@
+package cmd
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+
+	"github.com/dhruvmanila/pie/internal/pathutil"
+	"github.com/dhruvmanila/pie/internal/venv"
+	"github.com/dhruvmanila/pie/internal/xdg"
+)
+
+var cleanCmd = &cobra.Command{
+	Use:   "clean",
+	Short: "Remove any dangling virtual environments",
+	Long: `Remove any dangling virtual environments.
+
+A dangling virtual environment is one that is not associated with a project.
+`,
+	Args: cobra.NoArgs,
+	Run: func(_ *cobra.Command, _ []string) {
+		venvNames, err := venv.Names()
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		count := 0
+		for _, venvName := range venvNames {
+			projectPath, err := venv.ProjectPath(venvName)
+			if err != nil {
+				log.Fatal(err)
+			}
+
+			if !pathutil.IsDir(projectPath) {
+				venvDir := filepath.Join(xdg.DataDir, venvName)
+				fmt.Printf("Removing virtualenv (%s)...\n", green.Sprint(venvDir))
+				if err = os.RemoveAll(venvDir); err != nil {
+					log.Fatal(err)
+				}
+				count++
+			}
+		}
+
+		if count == 0 {
+			green.Println("✔ No dangling virtual environments found")
+		} else {
+			green.Printf("✔ Removed %d dangling virtual environments\n", count)
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(cleanCmd)
+}