Summary

#130 (Phase 1: list operation)

• Enable git wt (list mode) in bare repositories and worktrees created from bare repos
• Refactor RepoContext to unexported fields with 4-state query functions (IsBareRoot, IsBareWorktree, IsNormalMain, IsNormalWorktree)
• Fix MainRepoRoot() to return the correct path for bare repos where git-common-dir ends with .git (e.g., core.bare=true layout)
  • This is the main point of this PR.
• Unify bare detection: combine --is-bare-repository flag with filepath.Base(gitCommonDir) != ".git" heuristic to cover both repo.git and core.bare=true layouts

Display behavior

Table output (git wt)

When running from bare root:

  PATH              BRANCH       HEAD
* /tmp/repo.git     (bare)
  /tmp/wt/main      main         abc1234

When running from a worktree created from a bare repo:

  PATH              BRANCH       HEAD
  /tmp/repo.git     (bare)
* /tmp/wt/main      main         abc1234

• The bare entry shows (bare) in the BRANCH column (following git's convention)
• HEAD column is empty for the bare entry
• * marker indicates the current location

JSON output (git wt --json)

[
  {
    "path": "/tmp/repo.git",
    "branch": "",
    "head": "",
    "bare": true,
    "current": true
  },
  {
    "path": "/tmp/wt/main",
    "branch": "main",
    "head": "abc1234",
    "bare": false,
    "current": false
  }
]

• JSON consumers should use the bare field (not branch) to identify bare entries

Operations NOT yet supported in bare repos

• git wt <branch> (add/switch) — returns error mentioning "bare"
• git wt -d <branch> (delete) — returns error mentioning "bare"

These will be addressed in subsequent phases.

Test plan

• Unit tests for DetectRepoContext covering all 4 states + core.bare=true edge case
• Unit tests for CurrentLocation covering all 5 scenarios (normal repo, normal worktree, bare root, core.bare=true root, bare worktree)
• E2E tests for list in bare root, bare worktree, and core.bare=true layout
• E2E tests for JSON output with bare field validation
• E2E tests for * current marker in both bare root and worktree contexts
• E2E tests confirming add/delete still return errors for bare repos

🤖 Generated with Claude Code