asdf

asdf core contribution guide.

Initial Setup

Fork asdf on GitHub and/or Git clone the default branch:

# clone your fork
git clone https://github.com/<GITHUB_USER>/asdf.git
# or clone asdf
git clone https://github.com/asdf-vm/asdf.git

The tools for core development are in this repo's .tool-versions. If you wish to manage with asdf itself, add the plugins:

asdf plugin add bats https://github.com/timgluz/asdf-bats.git
asdf plugin add shellcheck https://github.com/luizm/asdf-shellcheck.git
asdf plugin add shfmt https://github.com/luizm/asdf-shfmt.git

Install the versions to develop asdf with:

asdf install

It may be useful to not use asdf to manage the tools during development on your local machine as you may need to break functionality which would then break your dev tooling. Here's the raw list of tools:

• bats-core: Bash Automated Testing System, for unit testing Bash or POSIX compliant scripts.
• shellcheck: Static analysis tool for shell scripts.
• shfmt: A shell parser, formatter, and interpreter with bash support; includes shfmt

Development

If you want to try out your changes without making change to your installed asdf, you can set the $ASDF_DIR variable to the path where you cloned the repository, and temporarily prepend the bin and shims directory of the directory to your path.

It is best to format, lint and test your code locally before you commit or push to the remote. Use the following scripts/commands:

# Lint
./scripts/lint.bash --check

# Fix & Format
./scripts/lint.bash --fix

# Test: all tests
./scripts/test.bash

# Test: for specific command
bats test/list_commands.bash

TIP

Add tests! - Tests are required for new features and speed up review of bug fixes. Please cover new code paths before you create a Pull Request. See bats-core documentation

Gitignore

The following is the .gitignore file in the asdf-vm/asdf repository. We ignore project-specific files. Files specific to your OS, tools or workflows should be ignored in your global .gitignore configuration, see here for more details.

/installs
/downloads
/shims
repository
.vagrant
keyrings
/tmp

dist/

.git-blame-ignore-revs

asdf uses a .git-blame-ignore-revs to reduce noise when running a blame. See the git blame documentation for more information.

Use the file with git blame like so:

git blame --ignore-revs-file .git-blame-ignore-revs ./test/install_command.bats

Optionally, configure to use the file on every invocation of blame without manually supplying it:

git config blame.ignoreRevsFile .git-blame-ignore-revs

It is possible to configure IDEs to use this file. For example, when using VSCode (with GitLens), write the following to .vscode/settings.json:

{
  "gitlens.advanced.blame.customArguments": [
    "--ignore-revs-file",
    ".git-blame-ignore-revs"
  ]
}

Bats Testing

Execute tests locally with:

./scripts/test.bash

Before writing tests please read:

• existing tests in test/
• bats-core documentation
• existing Bats settings used in scripts/test.bash

Bats Tips

Bats debugging can be difficult at times. Using the TAP output with -t flag will enable you to print outputs with the special file descriptor >&3 during test execution, simplifying debugging. As an example:

# test/some_tests.bats

printf "%s\n" "Will not be printed during bats test/some_tests.bats"
printf "%s\n" "Will be printed during bats -t test/some_tests.bats" >&3

This is further documented in bats-core Printing to the Terminal.

Pull Requests, Releases & Conventional Commits

asdf is using an automated release tool called Release Please to automatically bump the SemVer version and generate the Changelog. This information is determined by reading the commit history since the last release.

Conventional Commit messages define the format of the Pull Request Title which becomes the commit message format on the default branch. This is enforced with GitHub Action amannn/action-semantic-pull-request.

Conventional Commit follows this format:

<type>[optional scope][optional !]: <description>

<!-- examples -->
fix: some fix
feat: a new feature
docs: some documentation update
docs(website): some change for the website
feat!: feature with breaking change

The full list of <types> are: feat, fix, docs, style, refactor, perf, test, build, ci, chore, revert.

• !: indicates a breaking change
• fix: will create a new SemVer patch
• feat: will create a new SemVer minor
• <type>!: will create a new SemVer major

The Pull Request Title must follow this format.

TIP

Use Conventional Commit message format for your Pull Request Title.

Docker Images

The asdf-alpine and asdf-ubuntu projects are an ongoing effort to provide Dockerized images of some asdf tools. You can use these docker images as base for your development servers, or for running your production apps.