Add CheckedOutBranch to Model struct

pkg/commands/git_commands/branch.go

@@ -70,6 +70,21 @@ func (self *BranchCommands) CurrentBranchInfo() (BranchInfo, error) {
 	}, nil
 }
 
+// CurrentBranchName get name of current branch
+func (self *BranchCommands) CurrentBranchName() (string, error) {
+	cmdArgs := NewGitCmd("rev-parse").
+		Arg("--abbrev-ref").
+		Arg("--verify").
+		Arg("HEAD").
+		ToArgv()
+
+	output, err := self.cmd.New(cmdArgs).DontLog().RunWithOutput()
+	if err == nil {
+		return strings.TrimSpace(output), nil
+	}
+	return "", err
+}
+
 // Delete delete branch
 func (self *BranchCommands) Delete(branch string, force bool) error {
 	cmdArgs := NewGitCmd("branch").

pkg/commands/git_commands/status.go

@@ -1,6 +1,7 @@
 package git_commands
 
 import (
+	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -71,3 +72,14 @@ func IsBareRepo(osCommand *oscommands.OSCommand) (bool, error) {
 func (self *StatusCommands) IsInMergeState() (bool, error) {
 	return self.os.FileExists(filepath.Join(self.repoPaths.WorktreeGitDirPath(), "MERGE_HEAD"))
 }
+
+// Full ref (e.g. "refs/heads/mybranch") of the branch that is currently
+// being rebased, or empty string when we're not in a rebase
+func (self *StatusCommands) BranchBeingRebased() string {
+	for _, dir := range []string{"rebase-merge", "rebase-apply"} {
+		if bytesContent, err := os.ReadFile(filepath.Join(self.repoPaths.WorktreeGitDirPath(), dir, "head-name")); err == nil {
+			return strings.TrimSpace(string(bytesContent))
+		}
+	}
+	return ""
+}

pkg/gui/controllers/helpers/refresh_helper.go

@@ -272,6 +272,32 @@ func (self *RefreshHelper) refreshCommitsAndCommitFiles() {
 	}
 }
 
+func (self *RefreshHelper) determineCheckedOutBranchName() string {
+	if rebasedBranch := self.c.Git().Status.BranchBeingRebased(); rebasedBranch != "" {
+		// During a rebase we're on a detached head, so cannot determine the
+		// branch name in the usual way. We need to read it from the
+		// ".git/rebase-merge/head-name" file instead.
+		return strings.TrimPrefix(rebasedBranch, "refs/heads/")
+	}
+
+	if bisectInfo := self.c.Git().Bisect.GetInfo(); bisectInfo.Bisecting() && bisectInfo.GetStartSha() != "" {
+		// Likewise, when we're bisecting we're on a detached head as well. In
+		// this case we read the branch name from the ".git/BISECT_START" file.
+		return bisectInfo.GetStartSha()
+	}
+
+	// In all other cases, get the branch name by asking git what branch is
+	// checked out. Note that if we're on a detached head (for reasons other
+	// than rebasing or bisecting, i.e. it was explicitly checked out), then
+	// this will return its sha.
+	if branchName, err := self.c.Git().Branch.CurrentBranchName(); err == nil {
+		return branchName
+	}
+
+	// Should never get here unless the working copy is corrupt
+	return ""
+}
+
 func (self *RefreshHelper) refreshCommitsWithLimit() error {
 	self.c.Mutexes().LocalCommitsMutex.Lock()
 	defer self.c.Mutexes().LocalCommitsMutex.Unlock()
@@ -291,6 +317,7 @@ func (self *RefreshHelper) refreshCommitsWithLimit() error {
 	self.c.Model().Commits = commits
 	self.RefreshAuthors(commits)
 	self.c.Model().WorkingTreeStateAtLastCommitRefresh = self.c.Git().Status.WorkingTreeState()
+	self.c.Model().CheckedOutBranch = self.determineCheckedOutBranchName()
 
 	return self.c.PostRefreshUpdate(self.c.Contexts().LocalCommits)
 }

pkg/gui/types/common.go

@@ -217,6 +217,10 @@ type Model struct {
 	RemoteBranches                      []*models.RemoteBranch
 	Tags                                []*models.Tag
 
+	// Name of the currently checked out branch. This will be set even when
+	// we're on a detached head because we're rebasing or bisecting.
+	CheckedOutBranch string
+
 	// for displaying suggestions while typing in a file name
 	FilesTrie *patricia.Trie