feat: Add support for per-project sandbox overlays (#294)

* feat: Add support for per-project sandbox overlays

* chore: Maintain consistency with TUI experience

* fix: Code review fixes

cmd/sandbox/project_reset.go

@@ -0,0 +1,64 @@
+package sandbox
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/safedep/pmg/errcodes"
+	"github.com/safedep/pmg/internal/ui"
+	pmgsandbox "github.com/safedep/pmg/sandbox"
+	"github.com/spf13/cobra"
+)
+
+type projectResetOptions struct {
+	yes bool
+}
+
+func newProjectResetCommand(deps projectDeps) *cobra.Command {
+	opts := &projectResetOptions{}
+
+	cmd := &cobra.Command{
+		Use:           "reset",
+		Short:         "Delete the sandbox overlay for the current repository",
+		Args:          cobra.NoArgs,
+		SilenceErrors: false,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if err := runProjectReset(cmd.OutOrStdout(), opts, deps); err != nil {
+				return sandboxErrorExit(cmd, err)
+			}
+			return nil
+		},
+	}
+	cmd.Flags().BoolVar(&opts.yes, "yes", false, "Confirm deletion without an interactive prompt")
+	return cmd
+}
+
+func runProjectReset(out io.Writer, opts *projectResetOptions, deps projectDeps) error {
+	if !opts.yes {
+		return invalidArgumentError(
+			"refusing to reset without --yes",
+			"Re-run with `pmg sandbox project reset --yes` to delete the overlay.",
+		)
+	}
+
+	repoRoot, err := deps.repoRoot()
+	if err != nil {
+		return wrapUseful(err, errcodes.Unknown, "Could not determine the current repository root.")
+	}
+	overlay, path, err := pmgsandbox.LoadOverlayForRepo(deps.overlayDir(), repoRoot)
+	if err != nil {
+		return wrapUseful(err, errcodes.Unknown, "Could not read the project overlay file.")
+	}
+	if overlay == nil {
+		_, err := fmt.Fprintf(out, "%s\n", ui.Colors.Dim(fmt.Sprintf("No project overlay for %s", repoRoot)))
+		return err
+	}
+	if err := pmgsandbox.DeleteOverlayForRepo(deps.overlayDir(), repoRoot); err != nil {
+		return wrapUseful(err, errcodes.Unknown, "Could not delete the project overlay file.")
+	}
+	if _, err := fmt.Fprintf(out, "%s Deleted overlay for %s\n", ui.Colors.Green("✓"), repoRoot); err != nil {
+		return err
+	}
+	_, err = fmt.Fprintf(out, "  %s\n", ui.Colors.Dim(path))
+	return err
+}