This version is still in development and is not considered stable yet. For the latest stable version, please use fluent-tooling 0.0.1!

Development

The repository provides a reproducible Nix shell with Rust, Tree-sitter, Babashka, Clang, Emacs, and Flycheck.

Enter the development shell

nix develop

All commands below assume this shell unless shown with nix develop --command.

Repository layout

Path Contents

Path	Contents
`grammar.js`, `src/`, `queries/`	Grammar definition, generated parser, scanner, and queries
`crates/tree-sitter-fluent/`	Rust grammar bindings and parser tests
`crates/fluent-lint/`	Linter library, CLI, and tests
`editors/emacs/`	Major mode, Flymake adapter, Flycheck checker, and ERT tests
`test/fixtures/`	Upstream and project regression fixtures

grammar.js, src/, queries/

Grammar definition, generated parser, scanner, and queries

crates/tree-sitter-fluent/

Rust grammar bindings and parser tests

crates/fluent-lint/

Linter library, CLI, and tests

editors/emacs/

Major mode, Flymake adapter, Flycheck checker, and ERT tests

test/fixtures/

Upstream and project regression fixtures

Quality tasks

Babashka exposes the repository’s development tasks:

Command Action

Command	Action
`bb fmt`	Format Rust and grammar metadata sources
`bb fmt:check`	Check formatting without changing files
`bb lint`	Run Clippy with warnings denied
`bb test`	Run all Rust tests
`bb test:emacs`	Compile the grammar and run all ERT tests
`bb ci`	Run formatting, Clippy, Rust tests, and ERT tests

bb fmt

Format Rust and grammar metadata sources

bb fmt:check

Check formatting without changing files

bb lint

Run Clippy with warnings denied

bb test

Run all Rust tests

bb test:emacs

Compile the grammar and run all ERT tests

bb ci

Run formatting, Clippy, Rust tests, and ERT tests

Run the complete quality gate with:

bb ci

From outside the shell, use:

nix develop --command bb ci

Regenerate the parser

After editing grammar.js, regenerate the checked-in Tree-sitter output:

bb generate

Review changes to src/parser.c, src/grammar.json, and src/node-types.json with the grammar change. Run bb ci after generation.

Run the linter from Cargo

cargo run -p fluent-lint --bin ftl-lint -- \
  test/fixtures/regressions/broken.ftl

Test fixtures

The test suite adopts Project Fluent, Fluent.js, and fluent-rs fixtures in addition to project regressions. Imported fixtures retain exact line endings, trailing whitespace, and missing final newlines because those properties test parser behavior.

Record the source, revision, license, and local normalization of imported fixtures in test/fixtures/UPSTREAM.md. Grammar and fixture license provenance belongs in NOTICE.md.

Nix validation

Validate both packages and every flake check before release:

nix build
nix build .#tree-sitter-fluent
nix flake check