Setup PureScript Action

A GitHub Action which sets up a PureScript toolchain for CI. Contains the following tools by default:

• The PureScript compiler
• The Spago package manager and build tool
  • Use the unstable version for spago-next; otherwise, setup-purescript provides spago-legacy; see issue 37
• The psa error reporting frontend for the compiler

You can also optionally include the following tools:

• The purs-tidy code formatter
• The Zephyr dead code elimination tool

This action is designed to support PureScript tools. Your PureScript project may also depend on tooling and libraries provided by the NPM ecosystem, in which case you will also want to use the setup-node action.

Usage

See the action.yml file for all possible inputs and outputs.

Basic

Use the PureScript toolchain with the latest versions of PureScript and Spago:

steps:
  - uses: actions/checkout@v2
  - uses: purescript-contrib/setup-purescript@main
  - run: spago build

Other tools are not enabled by default, but you can enable them by specifying their version.

Specify Versions

Each tool can accept one of the following:

• a semantic version (only exact versions currently supported)
• the string "latest", which represents the latest version that uses major, minor, and patch, but will omit versions using pre-release identifiers or build metadata
• the string "unstable", which represents the latest version no matter what it is (i.e. pre-release identifiers and build metadata are not considered).

Tools that are not installed by default must be specified this way to be included in the toolchain.

steps:
  - uses: actions/checkout@v2
  - uses: purescript-contrib/setup-purescript@main
    with:
      purescript: "0.14.0"
      psa: "0.8.2"
      spago: "latest"
      purs-tidy: "latest"
      zephyr: "0.3.2"
  - run: spago build

Full Example Workflow

This workflow is a useful starting point for new projects and libraries. You can add a .yml file with the contents below to the .github/workflows directory in your project (for example: .github/workflows/ci.yml).

name: CI

on: push

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

      - uses: purescript-contrib/setup-purescript@main

      - name: Cache PureScript dependencies
        uses: actions/cache@v2
        # This cache uses the .dhall files to know when it should reinstall
        # and rebuild packages. It caches both the installed packages from
        # the `.spago` directory and compilation artifacts from the `output`
        # directory. When restored the compiler will rebuild any files that
        # have changed. If you do not want to cache compiled output, remove
        # the `output` path.
        with:
          key: ${{ runner.os }}-spago-${{ hashFiles('**/*.dhall') }}
          path: |
            .spago
            output

      - run: spago build

      - run: spago test --no-install

Development

Enter a development shell with necessary tools installed:

nix-shell

If you need any additional tools not included in this Nix expression or available via NPM, please feel free to add them via easy-purescript-nix.

Next, install NPM dependencies:

npm install

GitHub Actions uses the action.yml file to define the action and the dist/index.js file to execute it. After making any changes to the source code, make sure those changes are visible by running:

npm run build

This will bundle and minify the source code so it is available to the end user.

Used By

These libraries and applications are examples of setup-purescript in action:

• halogen
• halogen-realworld
• halogen-formless
• halogen-hooks
• slug
• ...add your package here!