Badness

Badness is a language server, formatter, and linter for LaTeX, built on a lossless concrete syntax tree.

It parses LaTeX once and serves three tools from that tree:

Formatter (badness format): deterministic, rule-based layout.
Linter (badness lint): diagnostics with source snippets.
Language server (badness lsp): both, live in your editor.

The architecture follows rust-analyzer: a generic, error-tolerant, hand-written parser produces a lossless tree, semantics are layered on top as a separate concern, and recomputation is incremental. badness never requires resolving macros or catcodes to succeed—anything it cannot statically recognize degrades to generic nodes rather than a crash. Two properties hold by construction and are enforced as tests: losslessness (the tree reconstructs the input byte-for-byte) and idempotence (formatting an already formatted file changes nothing).

Installation

Badness is available from several sources:

crates.io: cargo install badness
npm: npm install -g badness (bundles a prebuilt binary)
PyPI: uv tool install badness/pipx install badness
Prebuilt binaries: from the releases page
VS Code/Open VSX: the Badness extension (also works in Positron and Cursor)
From source: cargo install --path . in a checkout

The VS Code/Open VSX extension bundles the badness binary and starts the language server automatically when you open a .tex file.

Usage

# Format a file in place (or stdin → stdout with no path)
badness format paper.tex

# Verify formatting without writing—exits non-zero if anything would change
badness format --check paper.tex

# Lint, reporting parse diagnostics
badness lint paper.tex

# Run the language server over stdio
badness lsp

Formatter style is set through flags: --line-width (default 80), --indent-width (default 2), and --wrap (reflow by default; also preserve, sentence, and semantic). Persistent settings live in a badness.toml. See the documentation for the full reference.

The language server runs over stdio (badness lsp); see the editor setup guide for Neovim and VS Code wiring.

Documentation

Full documentation lives at https://badness.dev/ (built with mdBook from docs/).

Contributing

Architecture, tenets, and conventions are documented in AGENTS.md, written for both human and AI contributors. In short: keep the syntactic layer free of semantic knowledge, every parser feature needs corpus and snapshot tests plus a losslessness assertion, and code stays rustfmt-clean with clippy warnings treated as errors.

License

MIT

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badness 0.9.0

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