Contributing to rustac

First off, thanks for contributing! We appreciates you.

Testing

We aim for comprehensive unit testing of this library. Please provide tests for any new features, or to demonstrate bugs. Draft pull requests with a failing test to demonstrate a bug are much appreciated.

To run the tests (for the default crates):

cargo test

To run the rustac CLI using your local changes:

cargo run --help

DuckDB

By default, rustac will try to find DuckDB on your system, so you need to set DUCKDB_LIB_DIR to the directory containing your libduckdb. If you're on macos and using Homebrew, this might be export DUCKDB_LIB_DIR=/opt/homebrew/lib On linux, you can download the libduckdb-linux-{platform}.zip file from the latest release and unzip the contents into a directory on your machine (you will also need to set LD_LIBRARY_PATH to include this directory).

If you don't want to or can't install DuckDB, you can build rustac with the duckdb-bundled feature to build the bindings from scratch:

DUCKDB_DOWNLOAD_LIB=1 cargo build -F duckdb-bundled  # or cargo test, cargo run, etc...

Linting

We use prek to run our formatters and linters. Install it, then:

prek run --all-files

To run prek on new commits:

prek install

Submitting changes

Please open a pull request with your changes -- make sure to include unit tests. Please follow standard git commit formatting (subject line 50 characters max, wrap the body at 72 characters). Run prek run --all-files to make sure everything's copacetic.

We use conventional commits. Your commits do not have to but if you'd like to format them this way, we would be grateful.

If you can, use git rebase -i to create a clean, well-formatted history before opening your pull request. If you need to make changes after opening your pull request (e.g. to fix CI breakages) we will be grateful if you squash those fixes into their relevant commits.

Thanks so much!
-Pete Gadomski