fix(git): detached HEAD, tag-shadowed branches, submodule worktrees and wide PR titles - #679

What

• Git Branch on a detached HEAD (a tag checkout, a rebase in progress, a bisect) shows the short commit in parentheses, e.g. ⎇ (0449a12), instead of ⎇ no git. With hide-no-git on, it no longer disappears. The repo link points at that commit.
• Git Branch when a tag has the branch's name shows ⎇ release instead of ⎇ heads/release, and links to …/tree/release instead of …/tree/heads/release.
• Git Worktree in a submodule or a --separate-git-dir repo shows 𖠰 main instead of 𖠰 no git.
• Git PR titles are cut by terminal columns and whole characters: an emoji at the cut no longer turns into �, and a CJK title is cut to the same 30 columns as any other instead of taking 59.

Why

• Detached HEAD: Git Branch reads the branch with git symbolic-ref --short HEAD, which fails when HEAD isn't on a branch:

  $ git symbolic-ref --short HEAD
  fatal: ref HEAD is not a symbolic ref
  $ git rev-parse --short HEAD
  0449a12
  

  The widget treated that failure as "not a repository", though the Git SHA widget in the same line shows the commit.
• Branch and tag with the same name: --short disambiguates the name when a tag has it too, so it isn't a branch name any more:

  $ git switch -c release && git tag release
  $ git symbolic-ref --short HEAD
  heads/release
  

• Submodules and separate git dirs: Git Worktree told the main worktree from linked ones by the git dir's path: .git at the end means main, …/worktrees/<name> means linked, anything else means "no git". A submodule's git dir is .git/modules/<name>, and a --separate-git-dir repo's is wherever it was put:

  $ cd app/vendor/lib && git rev-parse --git-dir
  /…/app/.git/modules/vendor/lib
  $ cd sep && git rev-parse --git-dir
  /…/sep.git
  

  The path pattern could also misread a submodule of a repo kept under a directory named worktrees, e.g. ~/worktrees/app/.git/modules/lib showed as app/.git/modules/lib.
• PR titles: truncateTitle used title.slice(0, 29), which counts UTF-16 code units. Update the release workflow 🚀 for tagged builds kept the first half of the rocket's surrogate pair, which prints as U+FFFD. 修复状态栏在窄终端下的显示问题并且添加更多的测试用例以及文档说明 kept 29 characters, 58 columns wide.

How

• Git Branch reads the full ref with git symbolic-ref HEAD and strips refs/heads/, which always leaves the plain branch name. (git branch --show-current would also work, but needs git 2.22.) When there's no branch, it falls back to git rev-parse --short HEAD, the lookup Git SHA already makes, so the two share the git cache entry. no git (or hiding it) now only happens outside a work tree or when both lookups fail. A normal branch renders and links exactly as before. The detached link uses /tree/<sha>, which GitHub and GitLab both resolve.
• Git Worktree asks for git rev-parse --git-dir --git-common-dir in the one call it already made. A linked worktree's git dir is always <common dir>/worktrees/<name>, so that's the only shape read as linked, and the name is what follows. Any other git dir is the main worktree's. Linked worktrees keep their names, including those of bare repos, submodules and separate-git-dir repos. In a subdirectory of the main worktree, git prints the git dir absolute and the common dir relative (../../.git), and that still reads as main. Git older than 2.5, which has no --git-common-dir or linked worktrees, reads as main too.
• Git PR truncates with truncateStyledText, the display-cluster and width logic the renderer already uses for max widths, to 29 columns, then adds the same single …. Titles of plain ASCII come out exactly as before.

Demo

The status line piped from sample repositories built for the demo (fake remotes, PR data from a pre-filled cache, nothing fetched), with Git Branch, Git Worktree and Git PR on one line: a tag checkout, a branch with a tag of the same name, a submodule, and two long PR titles.

Powerline: before

Powerline: after

Plain: before

Plain: after

Testing

• New tests, each failing on main first: Git Branch on a detached HEAD (text, hide-no-git, link) and with a tag of the same name; Git Worktree in a submodule, a submodule under a worktrees directory, and a separate git dir; Git PR titles with an emoji at the cut and in CJK. Also added: main from a subdirectory of the main worktree, and a CJK title that fits. The existing Git Branch and Git Worktree tests now mock git's real output for the new commands.
• bun test: 2792 pass, 0 fail. bun run lint passes.
• The changed test files under Node (Vitest): 69 pass (59 on main).
• Real repositories under Bun: a tag checkout, a branch shadowed by a tag, a submodule, a separate git dir, the main worktree and a subdirectory of it, linked worktrees (with subdirectories) of a normal repo, a bare repo, a submodule and a separate-git-dir repo. Only the detached, shadowed-branch, submodule and separate-git-dir outputs change.
• Built CLI under Bun 1.4.2 and Node 26.10.0, piping a payload for each of the five demo repos: all runtimes give identical output in plain and Powerline modes, and each differs from main only as shown above. The baseline line is unchanged, and the TUI opens and exits cleanly under both.