refactor: break down large functions into smaller, focused ones

Major refactoring to improve code maintainability:

1. Split main.go (481 lines → 72 lines) into internal/cli package:
   - flags.go: Command-line flag definitions and parsing
   - handlers.go: General command handlers (version, config, list operations)
   - sync_handlers.go: Sync-specific handlers for all sync operations

2. Refactored sync.go to extract logic into separate files:
   - git_operations.go: Git command helpers (merge, push, fetch, etc.)
   - repository_setup.go: Repository initialization and remote configuration
   - branch_sync.go: Branch synchronization helpers

3. Reduced function sizes to meet 30-line guideline:
   - syncBranch: 104 lines → 26 lines
   - SyncRepository: 97 lines → 44 lines
   - main(): 465 lines → 63 lines
   - getAllBranches: 32 lines → 9 lines

All functionality remains the same, but the code is now more modular,
testable, and easier to understand. Each function has a single, clear
responsibility.

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

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

1 files changed, 28 insertions, 439 deletions

diff --git a/cmd/gitsyncer/main.go b/cmd/gitsyncer/main.go
index b7b974d..5175a1f 100644
--- a/cmd/gitsyncer/main.go
+++ b/cmd/gitsyncer/main.go
@@ -1,482 +1,71 @@
 package main
 
 import (
-	"flag"
-	"fmt"
-	"log"
 	"os"
-	"path/filepath"
-	"strings"
 
-	"codeberg.org/snonux/gitsyncer/internal/codeberg"
-	"codeberg.org/snonux/gitsyncer/internal/config"
-	"codeberg.org/snonux/gitsyncer/internal/github"
-	"codeberg.org/snonux/gitsyncer/internal/sync"
-	"codeberg.org/snonux/gitsyncer/internal/version"
+	"codeberg.org/snonux/gitsyncer/internal/cli"
 )
 
 func main() {
-	var (
-		versionFlag        bool
-		configPath         string
-		listOrgs           bool
-		listRepos          bool
-		syncRepo           string
-		syncAll            bool
-		syncCodebergPublic bool
-		syncGitHubPublic   bool
-		fullSync           bool
-		createGitHubRepos  bool
-		createCodebergRepos bool
-		dryRun             bool
-		workDir            string
-		testGitHubToken    bool
-	)
+	// Parse command-line flags
+	flags := cli.ParseFlags()
 
-	// Define command line flags
-	flag.BoolVar(&versionFlag, "version", false, "print version information")
-	flag.BoolVar(&versionFlag, "v", false, "print version information (short)")
-	flag.StringVar(&configPath, "config", "", "path to configuration file")
-	flag.StringVar(&configPath, "c", "", "path to configuration file (short)")
-	flag.BoolVar(&listOrgs, "list-orgs", false, "list configured organizations")
-	flag.BoolVar(&listRepos, "list-repos", false, "list configured repositories")
-	flag.StringVar(&syncRepo, "sync", "", "repository name to sync")
-	flag.BoolVar(&syncAll, "sync-all", false, "sync all configured repositories")
-	flag.BoolVar(&syncCodebergPublic, "sync-codeberg-public", false, "sync all public Codeberg repositories to GitHub")
-	flag.BoolVar(&syncGitHubPublic, "sync-github-public", false, "sync all public GitHub repositories to Codeberg")
-	flag.BoolVar(&fullSync, "full", false, "full bidirectional sync (enables --sync-codeberg-public --sync-github-public --create-github-repos --create-codeberg-repos)")
-	flag.BoolVar(&createGitHubRepos, "create-github-repos", false, "automatically create missing GitHub repositories")
-	flag.BoolVar(&createCodebergRepos, "create-codeberg-repos", false, "automatically create missing Codeberg repositories")
-	flag.BoolVar(&dryRun, "dry-run", false, "show what would be synced without actually syncing")
-	flag.StringVar(&workDir, "work-dir", ".gitsyncer-work", "working directory for cloning repositories")
-	flag.BoolVar(&testGitHubToken, "test-github-token", false, "test GitHub token authentication")
-	flag.Parse()
-
-	// Handle --full flag by enabling all sync operations
-	if fullSync {
-		syncCodebergPublic = true
-		syncGitHubPublic = true
-		createGitHubRepos = true
-		createCodebergRepos = true
-		fmt.Println("Full sync mode enabled:")
-		fmt.Println("  - Sync all public Codeberg repos to GitHub")
-		fmt.Println("  - Sync all public GitHub repos to Codeberg")
-		fmt.Println("  - Create missing GitHub repositories")
-		fmt.Println("  - Create missing Codeberg repositories (when implemented)")
-		fmt.Println()
+	// Handle --full flag message
+	if flags.FullSync {
+		cli.ShowFullSyncMessage()
 	}
 
 	// Handle version flag
-	if versionFlag {
-		fmt.Println(version.GetVersion())
-		os.Exit(0)
+	if flags.VersionFlag {
+		os.Exit(cli.HandleVersion())
 	}
 	
 	// Handle test GitHub token flag
-	if testGitHubToken {
-		fmt.Println("Testing GitHub token authentication...")
-		client := github.NewClient("", "snonux") // Empty token to trigger loading from env/file
-		if !client.HasToken() {
-			fmt.Println("ERROR: No GitHub token found!")
-			fmt.Println("Please set GITHUB_TOKEN environment variable or create ~/.gitsyncer_github_token file")
-			os.Exit(1)
-		}
-		
-		// Test the token by checking a known repo
-		exists, err := client.RepoExists("gitsyncer")
-		if err != nil {
-			fmt.Printf("ERROR: Token test failed: %v\n", err)
-			if strings.Contains(err.Error(), "401") {
-				fmt.Println("\nThe token is invalid or expired. Please check:")
-				fmt.Println("1. Token has not expired")
-				fmt.Println("2. Token has 'repo' scope")
-				fmt.Println("3. Token was not revoked")
-			}
-			os.Exit(1)
-		}
-		
-		fmt.Printf("SUCCESS: Token is valid! Repository check returned: %v\n", exists)
-		os.Exit(0)
-	}
-
-	// Determine config file path
-	if configPath == "" {
-		// Try default locations
-		home, err := os.UserHomeDir()
-		if err != nil {
-			log.Fatal("Failed to get home directory:", err)
-		}
-
-		// Check common config locations
-		configLocations := []string{
-			filepath.Join(".", "gitsyncer.json"),
-			filepath.Join(home, ".config", "gitsyncer", "config.json"),
-			filepath.Join(home, ".gitsyncer.json"),
-		}
-
-		for _, loc := range configLocations {
-			if _, err := os.Stat(loc); err == nil {
-				configPath = loc
-				break
-			}
-		}
-
-		if configPath == "" {
-			fmt.Println("No configuration file found. Please create one of:")
-			for _, loc := range configLocations {
-				fmt.Printf("  - %s\n", loc)
-			}
-			fmt.Println("\nOr specify a config file with --config flag")
-			fmt.Println("\nExample configuration:")
-			fmt.Println(`{
-  "organizations": [
-    {"host": "git@github.com", "name": "myorg"},
-    {"host": "git@codeberg.org", "name": "myorg"}
-  ],
-  "repositories": [
-    "repo1",
-    "repo2"
-  ]
-}`)
-			os.Exit(1)
-		}
+	if flags.TestGitHubToken {
+		os.Exit(cli.HandleTestGitHubToken())
 	}
 
 	// Load configuration
-	cfg, err := config.Load(configPath)
+	cfg, err := cli.LoadConfig(flags.ConfigPath)
 	if err != nil {
-		log.Fatal("Failed to load configuration:", err)
+		cli.ShowConfigHelp()
+		os.Exit(1)
 	}
 
-	fmt.Printf("Loaded configuration from: %s\n", configPath)
-
 	// Handle list organizations flag
-	if listOrgs {
-		fmt.Println("\nConfigured organizations:")
-		for _, org := range cfg.Organizations {
-			fmt.Printf("  - %s\n", org.GetGitURL())
-		}
-		os.Exit(0)
+	if flags.ListOrgs {
+		os.Exit(cli.HandleListOrgs(cfg))
 	}
 
 	// Handle list repositories flag
-	if listRepos {
-		fmt.Println("\nConfigured repositories:")
-		if len(cfg.Repositories) == 0 {
-			fmt.Println("  (none configured)")
-		} else {
-			for _, repo := range cfg.Repositories {
-				fmt.Printf("  - %s\n", repo)
-			}
-		}
-		os.Exit(0)
+	if flags.ListRepos {
+		os.Exit(cli.HandleListRepos(cfg))
 	}
 
 	// Handle sync operation
-	if syncRepo != "" {
-		// If create-github-repos is enabled, create the repo if needed
-		if createGitHubRepos {
-			githubOrg := cfg.FindGitHubOrg()
-			if githubOrg != nil {
-				fmt.Printf("Initializing GitHub client for organization: %s\n", githubOrg.Name)
-				githubClient := github.NewClient(githubOrg.GitHubToken, githubOrg.Name)
-				if githubClient.HasToken() {
-					fmt.Println("Checking/creating GitHub repository...")
-					err := githubClient.CreateRepo(syncRepo, fmt.Sprintf("Mirror of %s", syncRepo), false)
-					if err != nil {
-						fmt.Printf("ERROR: Failed to create GitHub repo %s: %v\n", syncRepo, err)
-						os.Exit(1)
-					}
-				} else {
-					fmt.Println("Warning: No GitHub token found. Cannot create repository.")
-				}
-			}
-		}
-		
-		syncer := sync.New(cfg, workDir)
-		if err := syncer.SyncRepository(syncRepo); err != nil {
-			log.Fatal("Sync failed:", err)
-		}
-		os.Exit(0)
+	if flags.SyncRepo != "" {
+		os.Exit(cli.HandleSync(cfg, flags))
 	}
 
 	// Handle sync all operation
-	if syncAll {
-		if len(cfg.Repositories) == 0 {
-			fmt.Println("No repositories configured. Add repositories to the config file.")
-			os.Exit(1)
-		}
-
-		// Initialize GitHub client if needed
-		var githubClient *github.Client
-		if createGitHubRepos {
-			githubOrg := cfg.FindGitHubOrg()
-			if githubOrg != nil {
-				fmt.Printf("Initializing GitHub client for organization: %s\n", githubOrg.Name)
-				githubClient = github.NewClient(githubOrg.GitHubToken, githubOrg.Name)
-				if !githubClient.HasToken() {
-					fmt.Println("Warning: No GitHub token found. Cannot create repositories.")
-					githubClient = nil
-				} else {
-					fmt.Println("GitHub client initialized successfully with token")
-				}
-			}
-		}
-
-		syncer := sync.New(cfg, workDir)
-		successCount := 0
-		
-		for i, repo := range cfg.Repositories {
-			fmt.Printf("\n[%d/%d] Syncing %s...\n", i+1, len(cfg.Repositories), repo)
-			
-			// Create GitHub repo if needed
-			if githubClient != nil {
-				fmt.Printf("Checking/creating GitHub repository %s...\n", repo)
-				err := githubClient.CreateRepo(repo, fmt.Sprintf("Mirror of %s", repo), false)
-				if err != nil {
-					fmt.Printf("ERROR: Failed to create GitHub repo %s: %v\n", repo, err)
-					fmt.Printf("Stopping sync due to error.\n")
-					os.Exit(1)
-				}
-			}
-			
-			if err := syncer.SyncRepository(repo); err != nil {
-				fmt.Printf("ERROR: Failed to sync %s: %v\n", repo, err)
-				fmt.Printf("Stopping sync due to error.\n")
-				os.Exit(1)
-			}
-			successCount++
-		}
-		
-		fmt.Printf("\nSuccessfully synced all %d repositories!\n", len(cfg.Repositories))
-		os.Exit(0)
+	if flags.SyncAll {
+		os.Exit(cli.HandleSyncAll(cfg, flags))
 	}
 
 	// Handle sync Codeberg public repos
-	if syncCodebergPublic {
-		codebergOrg := cfg.FindCodebergOrg()
-		if codebergOrg == nil {
-			fmt.Println("No Codeberg organization found in configuration")
-			os.Exit(1)
-		}
-
-		fmt.Printf("Fetching public repositories from Codeberg user/org: %s...\n", codebergOrg.Name)
-		
-		client := codeberg.NewClient(codebergOrg.Name)
-		
-		// Try fetching as organization first
-		repos, err := client.ListPublicRepos()
-		if err != nil {
-			// If that fails, try as user
-			fmt.Println("Trying as user account...")
-			repos, err = client.ListUserPublicRepos()
-			if err != nil {
-				log.Fatal("Failed to fetch repositories:", err)
-			}
+	if flags.SyncCodebergPublic {
+		exitCode := cli.HandleSyncCodebergPublic(cfg, flags)
+		if exitCode != 0 || !flags.SyncGitHubPublic {
+			os.Exit(exitCode)
 		}
-
-		repoNames := codeberg.GetRepoNames(repos)
-		fmt.Printf("Found %d public repositories on Codeberg\n", len(repoNames))
-		
-		if len(repoNames) == 0 {
-			fmt.Println("No public repositories found")
-			os.Exit(0)
-		}
-
-		// Show the repositories that will be synced
-		fmt.Println("\nRepositories to sync:")
-		for _, name := range repoNames {
-			fmt.Printf("  - %s\n", name)
-		}
-		
-		if dryRun {
-			fmt.Printf("\n[DRY RUN] Would sync %d repositories from Codeberg to GitHub\n", len(repoNames))
-			if createGitHubRepos {
-				fmt.Println("Would create missing GitHub repositories")
-			}
-			if !syncGitHubPublic {
-				os.Exit(0)
-			}
-		}
-		
-		if !dryRun {
-			// If create-github-repos is enabled, pre-create repos on GitHub
-			var githubClient *github.Client
-		if createGitHubRepos {
-			githubOrg := cfg.FindGitHubOrg()
-			if githubOrg == nil {
-				fmt.Println("Warning: --create-github-repos specified but no GitHub organization found in config")
-			} else {
-				fmt.Printf("Initializing GitHub client for organization: %s\n", githubOrg.Name)
-				githubClient = github.NewClient(githubOrg.GitHubToken, githubOrg.Name)
-				if !githubClient.HasToken() {
-					fmt.Println("Warning: No GitHub token found. Set GITHUB_TOKEN env var or create ~/.gitsyncer_github_token")
-					fmt.Println("         or add github_token to your config file")
-					githubClient = nil
-				} else {
-					fmt.Println("GitHub client initialized successfully with token")
-				}
-			}
-		}
-		
-		fmt.Printf("\nStarting sync of %d repositories...\n", len(repoNames))
-		
-		syncer := sync.New(cfg, workDir)
-		successCount := 0
-		
-		// Get Codeberg repos for description
-		codebergRepoMap := make(map[string]codeberg.Repository)
-		for _, repo := range repos {
-			codebergRepoMap[repo.Name] = repo
-		}
-		
-		for i, repoName := range repoNames {
-			fmt.Printf("\n[%d/%d] Syncing %s...\n", i+1, len(repoNames), repoName)
-			
-			// Create GitHub repo if needed
-			if githubClient != nil && createGitHubRepos {
-				codebergRepo := codebergRepoMap[repoName]
-				description := codebergRepo.Description
-				if description == "" {
-					description = fmt.Sprintf("Mirror of %s from Codeberg", repoName)
-				}
-				
-				fmt.Printf("Checking/creating GitHub repository %s...\n", repoName)
-				err := githubClient.CreateRepo(repoName, description, false) // public repos
-				if err != nil {
-					fmt.Printf("ERROR: Failed to create GitHub repo %s: %v\n", repoName, err)
-					fmt.Printf("Stopping sync due to error.\n")
-					os.Exit(1)
-				}
-			}
-			
-			if err := syncer.SyncRepository(repoName); err != nil {
-				fmt.Printf("ERROR: Failed to sync %s: %v\n", repoName, err)
-				fmt.Printf("Stopping sync due to error.\n")
-				os.Exit(1)
-			} else {
-				successCount++
-			}
-		}
-
-		fmt.Printf("\n=== Summary ===\n")
-		fmt.Printf("Successfully synced: %d repositories\n", successCount)
-		} // End of if !dryRun
-		
-		if !syncGitHubPublic {
-			os.Exit(0)
-		}
-		
-		// Add separator when doing full sync
-		fmt.Println("\n" + strings.Repeat("=", 70))
-		fmt.Println("=== Continuing with GitHub to Codeberg sync ===")
-		fmt.Println(strings.Repeat("=", 70) + "\n")
 	}
 
 	// Handle sync GitHub public repos
-	if syncGitHubPublic {
-		githubOrg := cfg.FindGitHubOrg()
-		if githubOrg == nil {
-			fmt.Println("No GitHub organization found in configuration")
-			os.Exit(1)
-		}
-
-		fmt.Printf("Fetching public repositories from GitHub user/org: %s...\n", githubOrg.Name)
-		
-		client := github.NewClient(githubOrg.GitHubToken, githubOrg.Name)
-		if !client.HasToken() {
-			fmt.Println("ERROR: GitHub token required to list repositories")
-			fmt.Println("Set GITHUB_TOKEN env var or create ~/.gitsyncer_github_token file")
-			os.Exit(1)
-		}
-		
-		repos, err := client.ListPublicRepos()
-		if err != nil {
-			log.Fatal("Failed to fetch repositories:", err)
-		}
-
-		repoNames := github.GetRepoNames(repos)
-		fmt.Printf("Found %d public repositories on GitHub\n", len(repoNames))
-		
-		if len(repoNames) == 0 {
-			fmt.Println("No public repositories found")
-			os.Exit(0)
-		}
-
-		// Show the repositories that will be synced
-		fmt.Println("\nRepositories to sync:")
-		for _, name := range repoNames {
-			fmt.Printf("  - %s\n", name)
-		}
-		
-		if dryRun {
-			fmt.Printf("\n[DRY RUN] Would sync %d repositories from GitHub to Codeberg\n", len(repoNames))
-			if createCodebergRepos {
-				fmt.Println("Would create missing Codeberg repositories")
-			}
-			os.Exit(0)
-		}
-		
-		if !dryRun {
-			// TODO: Add Codeberg API client for repo creation
-			if createCodebergRepos {
-			fmt.Println("WARNING: --create-codeberg-repos is not yet implemented")
-			fmt.Println("         Repositories must exist on Codeberg before syncing")
-		}
-		
-		fmt.Printf("\nStarting sync of %d repositories...\n", len(repoNames))
-		
-		syncer := sync.New(cfg, workDir)
-		successCount := 0
-		
-		// Get GitHub repos for description
-		githubRepoMap := make(map[string]github.Repository)
-		for _, repo := range repos {
-			githubRepoMap[repo.Name] = repo
-		}
-		
-		for i, repoName := range repoNames {
-			fmt.Printf("\n[%d/%d] Syncing %s...\n", i+1, len(repoNames), repoName)
-			
-			if err := syncer.SyncRepository(repoName); err != nil {
-				fmt.Printf("ERROR: Failed to sync %s: %v\n", repoName, err)
-				fmt.Printf("Stopping sync due to error.\n")
-				os.Exit(1)
-			} else {
-				successCount++
-			}
-		}
-
-		fmt.Printf("\n=== Summary ===\n")
-		fmt.Printf("Successfully synced: %d repositories\n", successCount)
-		} // End of if !dryRun
-		
-		os.Exit(0)
+	if flags.SyncGitHubPublic {
+		os.Exit(cli.HandleSyncGitHubPublic(cfg, flags))
 	}
 
 	// Default: show usage
-	fmt.Println("\ngitsyncer - Git repository synchronization tool")
-	fmt.Printf("Configured with %d organization(s) and %d repository(ies)\n", 
-		len(cfg.Organizations), len(cfg.Repositories))
-	fmt.Println("\nUsage:")
-	fmt.Println("  gitsyncer --sync <repo-name>        Sync a specific repository")
-	fmt.Println("  gitsyncer --sync-all                Sync all configured repositories")
-	fmt.Println("  gitsyncer --sync-codeberg-public    Sync all public Codeberg repositories to GitHub")
-	fmt.Println("  gitsyncer --sync-github-public      Sync all public GitHub repositories to Codeberg")
-	fmt.Println("  gitsyncer --full                    Full bidirectional sync of all public repos")
-	fmt.Println("  gitsyncer --list-orgs               List configured organizations")
-	fmt.Println("  gitsyncer --list-repos              List configured repositories")
-	fmt.Println("  gitsyncer --test-github-token       Test GitHub token authentication")
-	fmt.Println("  gitsyncer --version                 Show version information")
-	fmt.Println("\nOptions:")
-	fmt.Println("  --config <path>                     Path to configuration file")
-	fmt.Println("  --work-dir <path>                   Working directory for operations (default: .gitsyncer-work)")
-	fmt.Println("  --create-github-repos               Create missing GitHub repositories automatically")
-	fmt.Println("  --create-codeberg-repos             Create missing Codeberg repositories (not yet implemented)")
-	fmt.Println("  --dry-run                           Show what would be done without doing it")
-	fmt.Println("\nGitHub Token:")
-	fmt.Println("  Set via: config file, GITHUB_TOKEN env var, or ~/.gitsyncer_github_token file")
-	
-	// Exit with error code when no action was specified
+	cli.ShowUsage(cfg)
 	os.Exit(1)
 }
\ No newline at end of file