Begin refactoring gui

This begins a big refactor of moving more code out of the Gui struct into contexts, controllers, and helpers. We also move some code into structs in the
gui package purely for the sake of better encapsulation

pkg/gui/controllers/helpers/repos_helper.go

@@ -0,0 +1,175 @@
+package helpers
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"github.com/jesseduffield/generics/slices"
+	appTypes "github.com/jesseduffield/lazygit/pkg/app/types"
+	"github.com/jesseduffield/lazygit/pkg/commands"
+	"github.com/jesseduffield/lazygit/pkg/commands/models"
+	"github.com/jesseduffield/lazygit/pkg/env"
+	"github.com/jesseduffield/lazygit/pkg/gui/presentation/icons"
+	"github.com/jesseduffield/lazygit/pkg/gui/style"
+	"github.com/jesseduffield/lazygit/pkg/gui/types"
+	"github.com/jesseduffield/lazygit/pkg/utils"
+)
+
+type onNewRepoFn func(startArgs appTypes.StartArgs, reuseState bool) error
+
+// helps switch back and forth between repos
+type ReposHelper struct {
+	c                     *types.HelperCommon
+	recordDirectoryHelper *RecordDirectoryHelper
+	onNewRepo             onNewRepoFn
+}
+
+func NewRecentReposHelper(
+	c *types.HelperCommon,
+	recordDirectoryHelper *RecordDirectoryHelper,
+	onNewRepo onNewRepoFn,
+) *ReposHelper {
+	return &ReposHelper{
+		c:                     c,
+		recordDirectoryHelper: recordDirectoryHelper,
+		onNewRepo:             onNewRepo,
+	}
+}
+
+func (self *ReposHelper) EnterSubmodule(submodule *models.SubmoduleConfig) error {
+	wd, err := os.Getwd()
+	if err != nil {
+		return err
+	}
+	self.c.State().GetRepoPathStack().Push(wd)
+
+	return self.DispatchSwitchToRepo(submodule.Path, true)
+}
+
+func (self *ReposHelper) getCurrentBranch(path string) string {
+	readHeadFile := func(path string) (string, error) {
+		headFile, err := os.ReadFile(filepath.Join(path, "HEAD"))
+		if err == nil {
+			content := strings.TrimSpace(string(headFile))
+			refsPrefix := "ref: refs/heads/"
+			var branchDisplay string
+			if strings.HasPrefix(content, refsPrefix) {
+				// is a branch
+				branchDisplay = strings.TrimPrefix(content, refsPrefix)
+			} else {
+				// detached HEAD state, displaying short SHA
+				branchDisplay = utils.ShortSha(content)
+			}
+			return branchDisplay, nil
+		}
+		return "", err
+	}
+
+	gitDirPath := filepath.Join(path, ".git")
+
+	if gitDir, err := os.Stat(gitDirPath); err == nil {
+		if gitDir.IsDir() {
+			// ordinary repo
+			if branch, err := readHeadFile(gitDirPath); err == nil {
+				return branch
+			}
+		} else {
+			// worktree
+			if worktreeGitDir, err := os.ReadFile(gitDirPath); err == nil {
+				content := strings.TrimSpace(string(worktreeGitDir))
+				worktreePath := strings.TrimPrefix(content, "gitdir: ")
+				if branch, err := readHeadFile(worktreePath); err == nil {
+					return branch
+				}
+			}
+		}
+	}
+
+	return self.c.Tr.LcBranchUnknown
+}
+
+func (self *ReposHelper) CreateRecentReposMenu() error {
+	// we'll show an empty panel if there are no recent repos
+	recentRepoPaths := []string{}
+	if len(self.c.GetAppState().RecentRepos) > 0 {
+		// we skip the first one because we're currently in it
+		recentRepoPaths = self.c.GetAppState().RecentRepos[1:]
+	}
+
+	currentBranches := sync.Map{}
+
+	wg := sync.WaitGroup{}
+	wg.Add(len(recentRepoPaths))
+
+	for _, path := range recentRepoPaths {
+		go func(path string) {
+			defer wg.Done()
+			currentBranches.Store(path, self.getCurrentBranch(path))
+		}(path)
+	}
+
+	wg.Wait()
+
+	menuItems := slices.Map(recentRepoPaths, func(path string) *types.MenuItem {
+		branchName, _ := currentBranches.Load(path)
+		if icons.IsIconEnabled() {
+			branchName = icons.BRANCH_ICON + " " + fmt.Sprintf("%v", branchName)
+		}
+
+		return &types.MenuItem{
+			LabelColumns: []string{
+				filepath.Base(path),
+				style.FgCyan.Sprint(branchName),
+				style.FgMagenta.Sprint(path),
+			},
+			OnPress: func() error {
+				// if we were in a submodule, we want to forget about that stack of repos
+				// so that hitting escape in the new repo does nothing
+				self.c.State().GetRepoPathStack().Clear()
+				return self.DispatchSwitchToRepo(path, false)
+			},
+		}
+	})
+
+	return self.c.Menu(types.CreateMenuOptions{Title: self.c.Tr.RecentRepos, Items: menuItems})
+}
+
+func (self *ReposHelper) DispatchSwitchToRepo(path string, reuse bool) error {
+	env.UnsetGitDirEnvs()
+	originalPath, err := os.Getwd()
+	if err != nil {
+		return nil
+	}
+
+	if err := os.Chdir(path); err != nil {
+		if os.IsNotExist(err) {
+			return self.c.ErrorMsg(self.c.Tr.ErrRepositoryMovedOrDeleted)
+		}
+		return err
+	}
+
+	if err := commands.VerifyInGitRepo(self.c.OS()); err != nil {
+		if err := os.Chdir(originalPath); err != nil {
+			return err
+		}
+
+		return err
+	}
+
+	if err := self.recordDirectoryHelper.RecordCurrentDirectory(); err != nil {
+		return err
+	}
+
+	// these two mutexes are used by our background goroutines (triggered via `self.goEvery`. We don't want to
+	// switch to a repo while one of these goroutines is in the process of updating something
+	self.c.Mutexes().SyncMutex.Lock()
+	defer self.c.Mutexes().SyncMutex.Unlock()
+
+	self.c.Mutexes().RefreshingFilesMutex.Lock()
+	defer self.c.Mutexes().RefreshingFilesMutex.Unlock()
+
+	return self.onNewRepo(appTypes.StartArgs{}, reuse)
+}