yacc-statusline-editor

Yet Another Claude Code statusline editor. Interactive Textual TUI for composing a Claude Code statusline by picking, ordering, and configuring pre-built segments. It outputs a Bash script (using jq) and merges a statusLine block into your chosen scope's settings.json.

Requirements

• Python ≥ 3.11
• jq on PATH (the editor still launches without it, but the test-run modal is disabled)

Install

Recommended — install as an isolated tool:

# with uv
uv tool install yacc-statusline-editor

# or with pipx
pipx install yacc-statusline-editor

Then launch:

statusline-editor

From source (development)

uv sync
uv run statusline-editor
# equivalent
uv run python -m statusline_editor

What it does

• Pick segments from a registry, reorder them, configure each with typed options (color, bool, int, string, enum, threshold), and split rows with a newline segment.
• Live in-process preview against mock JSON fixtures (FULL / MINIMAL / NULLED) so you see exactly what the statusline will render.
• On save: writes statusline.sh (Bash + jq) and merges a statusLine block into settings.json for the chosen scope. Existing settings.json is backed up to settings.json.bak; the write is atomic. Unrelated keys (hooks, env, permissions, …) are preserved in original order.
• Sidecar statusline.config.json is the source of truth — reopening the editor reads the sidecar, never re-parses the generated Bash.
• Hand-edit detection: if statusline.sh exists without the editor's marker, you'll get a warning before overwrite.

Scope

• User scope: ~/.claude/
• Project scope: <cwd>/.claude/

You pick the scope at save time. On load, project beats user when both have a sidecar.

Built-in segments

model, directory, git, context_bar, context_pct, context_tokens, cost, duration, lines_changed, rate_5h, rate_7d, pr, effort, output_style, session_name, worktree, vim_mode, custom_text, newline.

Adding a new segment

1. Create src/statusline_editor/segments/<id>.py with a class implementing id, label, default_options, options_schema, render, to_bash.
2. Add one entry to SEGMENT_REGISTRY in segments/__init__.py.

The edit panel renders itself from options_schema — no UI code needed. Every segment is automatically opted into a parameterized matrix test that asserts render (Python) and to_bash (Bash) produce byte-identical output (modulo ANSI) across the three fixtures.

Tests

uv run pytest
uv run pytest -k duplicate
uv run pytest tests/test_composition_refresh.py::test_refresh_after_initial_load_keeps_unique_ids

Project layout

src/statusline_editor/
├── app.py          # Textual App + modals (only impure layer)
├── config.py       # Composition / SegmentInstance + atomic_write + scope resolution
├── generator.py    # Composition → statusline.sh
├── settings.py     # Merge statusLine into settings.json (atomic, backed up)
├── preview.py      # In-process live render + subprocess test-run
├── fixtures.py     # FULL / MINIMAL / NULLED mock JSON
└── segments/       # Segment registry — one file per id

See CLAUDE.md for architecture notes and docs/superpowers/specs/2026-06-03-statusline-editor-design.md for the full design spec.