Seed install UX: number selection, friendly errors, backup on force

- Allow selecting seeds by number (e.g. `same seed install 1`)
- Show green checkmark instead of error for already-installed seeds
- Back up existing seed to .bak before --force reinstall
- Friendlier error messages with reinstall hints

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sgx-labs

cmd/same/seed_cmd.go

@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"strconv"
 	"strings"
 
 	"github.com/spf13/cobra"
@@ -88,6 +89,13 @@ func seedInstallCmd() *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			name := args[0]
 
+			// Allow selecting by number (e.g. "same seed install 1")
+			if n, err := strconv.Atoi(name); err == nil && n >= 1 {
+				if m, mErr := seed.FetchManifest(false); mErr == nil && n <= len(m.Seeds) {
+					name = m.Seeds[n-1].Name
+				}
+			}
+
 			fmt.Println()
 			fmt.Printf("  %sSeed Install:%s %s\n\n", cli.Bold, cli.Reset, name)
 
@@ -127,6 +135,10 @@ func seedInstallCmd() *cobra.Command {
 				if strings.Contains(errMsg, "requires SAME") {
 					return userError(errMsg, "Run 'same update' to get the latest version")
 				}
+				if strings.Contains(errMsg, "already installed") {
+					fmt.Printf("  %s✓%s %s\n", cli.Green, cli.Reset, errMsg)
+					return nil
+				}
 				return fmt.Errorf("install failed: %w", err)
 			}
 
@@ -153,15 +165,24 @@ func seedInfoCmd() *cobra.Command {
 		Args:              cobra.ExactArgs(1),
 		ValidArgsFunction: seedNameCompleter,
 		RunE: func(cmd *cobra.Command, args []string) error {
+			name := args[0]
+
+			// Allow selecting by number (e.g. "same seed info 1")
+			if n, err := strconv.Atoi(name); err == nil && n >= 1 {
+				if m, mErr := seed.FetchManifest(false); mErr == nil && n <= len(m.Seeds) {
+					name = m.Seeds[n-1].Name
+				}
+			}
+
 			manifest, err := seed.FetchManifest(false)
 			if err != nil {
 				return userError("Could not fetch seed list", "Check your internet connection")
 			}
 
-			s := seed.FindSeed(manifest, args[0])
+			s := seed.FindSeed(manifest, name)
 			if s == nil {
 				return userError(
-					fmt.Sprintf("Seed %q not found", args[0]),
+					fmt.Sprintf("Seed %q not found", name),
 					"Run 'same seed list' to see available seeds",
 				)
 			}

internal/seed/install.go

@@ -105,11 +105,18 @@ func Install(opts InstallOptions) (*InstallResult, error) {
 	// 5. Check if directory exists
 	if info, err := os.Stat(absDir); err == nil && info.IsDir() {
 		if !opts.Force {
-			return nil, fmt.Errorf("directory already exists: %s — use --force to overwrite", absDir)
+			return nil, fmt.Errorf("already installed at %s\n    To reinstall, run: same seed install %s --force\n    Back up your notes first if you've added any to this seed", absDir, opts.Name)
 		}
-		// Remove existing to start fresh
-		if err := os.RemoveAll(absDir); err != nil {
-			return nil, fmt.Errorf("remove existing directory: %w", err)
+		// Back up to .bak before removing
+		bakDir := absDir + ".bak"
+		_ = os.RemoveAll(bakDir) // remove stale backup
+		if err := os.Rename(absDir, bakDir); err != nil {
+			// Rename failed, fall back to remove
+			if err := os.RemoveAll(absDir); err != nil {
+				return nil, fmt.Errorf("remove existing directory: %w", err)
+			}
+		} else {
+			fmt.Fprintf(os.Stderr, "  Backed up existing to %s\n", filepath.Base(bakDir))
 		}
 	}
 

internal/setup/init.go

@@ -673,8 +673,11 @@ func offerSeedInstall(opts InitOptions) bool {
 
 		result, err := seed.Install(installOpts)
 		if err != nil {
-			fmt.Printf("  %s!%s Install failed: %v\n", cli.Yellow, cli.Reset, err)
-			fmt.Printf("  %sYou can try again with: same seed install %s%s\n\n", cli.Dim, chosen.Name, cli.Reset)
+			if strings.Contains(err.Error(), "already installed") {
+				fmt.Printf("  %s✓%s %v\n\n", cli.Green, cli.Reset, err)
+			} else {
+				fmt.Printf("  %s!%s %v\n\n", cli.Yellow, cli.Reset, err)
+			}
 			continue
 		}
 
@@ -803,8 +806,11 @@ func showSeedIntro(opts InitOptions) {
 
 		result, err := seed.Install(installOpts)
 		if err != nil {
-			fmt.Printf("  %s!%s Install failed: %v\n", cli.Yellow, cli.Reset, err)
-			fmt.Printf("  %sYou can try again with: same seed install %s%s\n\n", cli.Dim, chosen.Name, cli.Reset)
+			if strings.Contains(err.Error(), "already installed") {
+				fmt.Printf("  %s✓%s %v\n\n", cli.Green, cli.Reset, err)
+			} else {
+				fmt.Printf("  %s!%s %v\n\n", cli.Yellow, cli.Reset, err)
+			}
 			continue
 		}