autoconfigure mirror URL

cmd/github-sync/main.go

@@ -5,7 +5,9 @@ import (
 	"context"
 	"fmt"
 	"os"
+	"os/exec"
 	"os/signal"
+	"strings"
 	"syscall"
 
 	"github.com/go-i2p/go-github-sync/pkg/config"
@@ -55,6 +57,18 @@ func run(ctx context.Context, log *logger.Logger) error {
 	if err != nil {
 		return fmt.Errorf("failed to load configuration: %w", err)
 	}
+
+	// Auto-detect GitHub remote if mirror is not specified
+	if cfg.MirrorRepo == "" {
+		mirrorRepo, err := detectGithubRemote(ctx)
+		if err != nil {
+			log.Debug("Failed to auto-detect GitHub remote", "error", err)
+		} else if mirrorRepo != "" {
+			cfg.MirrorRepo = mirrorRepo
+			log.Info("Auto-detected GitHub mirror repository", "mirror_repo", cfg.MirrorRepo)
+		}
+	}
+
 	log.Info("Configuration loaded successfully",
 		"primary_repo", cfg.PrimaryRepo,
 		"mirror_repo", cfg.MirrorRepo,
@@ -112,3 +126,34 @@ func run(ctx context.Context, log *logger.Logger) error {
 
 	return nil
 }
+
+// detectGithubRemote attempts to detect a GitHub remote URL from the current git repository
+func detectGithubRemote(ctx context.Context) (string, error) {
+	// Execute git remote -v command
+	cmd := exec.CommandContext(ctx, "git", "remote", "-v")
+	output, err := cmd.Output()
+	if err != nil {
+		return "", fmt.Errorf("failed to execute git remote command: %w", err)
+	}
+
+	// Parse the output to find GitHub remotes
+	lines := strings.Split(string(output), "\n")
+	for _, line := range lines {
+		if strings.Contains(line, "github.com") && strings.Contains(line, "(push)") {
+			// Extract the GitHub repository URL
+			parts := strings.Fields(line)
+			if len(parts) >= 2 {
+				url := parts[1]
+				// Convert SSH URL to HTTPS URL if needed
+				if strings.HasPrefix(url, "git@github.com:") {
+					url = strings.Replace(url, "git@github.com:", "https://github.com/", 1)
+				}
+				// Remove .git suffix if present
+				url = strings.TrimSuffix(url, ".git")
+				return url, nil
+			}
+		}
+	}
+
+	return "", fmt.Errorf("no GitHub remote found")
+}