Add URL validation + fix path display for Git Bash

- Validate repo URL format before cloning
- Check remote accessibility with git ls-remote
- Use forward slashes in path output (Git Bash compat)
- Quote paths in instructions

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: FelixIsaac

internal/cmd/init.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"fmt"
 	"os"
+	"strings"
 
 	"github.com/fatih/color"
 	"github.com/felixisaac/claude-code-sync/internal/config"
@@ -12,6 +13,11 @@ import (
 	"github.com/spf13/cobra"
 )
 
+// toUnixPath converts Windows backslashes to forward slashes for display
+func toUnixPath(path string) string {
+	return strings.ReplaceAll(path, "\\", "/")
+}
+
 var initCmd = &cobra.Command{
 	Use:   "init [repo-url]",
 	Short: "Initialize sync (generate keys, clone/create repo)",
@@ -95,8 +101,19 @@ func runInit(cmd *cobra.Command, args []string) error {
 	g := git.New(paths.RepoDir)
 
 	if repoURL != "" {
+		// Validate URL format
+		if !git.IsValidRepoURL(repoURL) {
+			return fmt.Errorf("invalid repo URL: %s\nExpected format: https://github.com/user/repo or git@github.com:user/repo.git", repoURL)
+		}
+
+		// Check if URL is reachable
+		logInfo("Verifying repo URL...")
+		if err := git.CheckRemote(repoURL); err != nil {
+			return fmt.Errorf("cannot access repo: %w\nCheck the URL and your permissions", err)
+		}
+
 		if g.IsRepo() {
-			logWarn(fmt.Sprintf("Repo already exists at %s", paths.RepoDir))
+			logWarn(fmt.Sprintf("Repo already exists at %s", toUnixPath(paths.RepoDir)))
 		} else {
 			logInfo("Cloning repo...")
 			if err := git.Clone(repoURL, paths.RepoDir); err != nil {
@@ -115,7 +132,7 @@ func runInit(cmd *cobra.Command, args []string) error {
 		}
 		fmt.Println()
 		logInfo("No repo URL provided. To add a remote later:")
-		fmt.Printf("  git -C %s remote add origin <your-repo-url>\n", paths.RepoDir)
+		fmt.Printf("  git -C \"%s\" remote add origin <your-repo-url>\n", toUnixPath(paths.RepoDir))
 		fmt.Println("  claude-code-sync push")
 	}
 

internal/git/git.go

@@ -145,6 +145,40 @@ func IsInstalled() bool {
 	return err == nil
 }
 
+// IsValidRepoURL checks if a string looks like a valid git repo URL
+func IsValidRepoURL(url string) bool {
+	// HTTPS URLs
+	if strings.HasPrefix(url, "https://") || strings.HasPrefix(url, "http://") {
+		return strings.Contains(url, "/")
+	}
+	// SSH URLs (git@host:user/repo)
+	if strings.HasPrefix(url, "git@") {
+		return strings.Contains(url, ":")
+	}
+	// SSH URLs (ssh://git@host/user/repo)
+	if strings.HasPrefix(url, "ssh://") {
+		return strings.Contains(url, "/")
+	}
+	return false
+}
+
+// CheckRemote verifies a remote URL is accessible
+func CheckRemote(url string) error {
+	cmd := exec.Command("git", "ls-remote", "--exit-code", url)
+	var stderr bytes.Buffer
+	cmd.Stderr = &stderr
+
+	err := cmd.Run()
+	if err != nil {
+		errMsg := strings.TrimSpace(stderr.String())
+		if errMsg != "" {
+			return fmt.Errorf("%s", errMsg)
+		}
+		return fmt.Errorf("repository not found or not accessible")
+	}
+	return nil
+}
+
 // CreateInitialCommit creates a README and initial commit
 func (g *Git) CreateInitialCommit() error {
 	readme := filepath.Join(g.repoDir, "README.md")