setup-haskell

This action sets up a Haskell environment for use in actions by:

• optionally installing a version of ghc and cabal and adding to PATH.
• optionally installing a version of Stack and adding to PATH.
• setting the outputs of ghc-path, cabal-path, stack-path, and cabal-store when necessary.

The GitHub runners come with pre-installed versions of GHC and Cabal. Those will be used whenever possible. For all other versions, this action utilizes ppa:hvr/ghc, ghcup, and chocolatey.

Usage

See action.yml

Minimal:

on: [push]
name: build
jobs:
  runhaskell:
    name: Hello World
    runs-on: ubuntu-latest # or macOS-latest, or windows-latest
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-haskell@v1.1
      - run: runhaskell Hello.hs

Basic:

on: [push]
name: build
jobs:
  runhaskell:
    name: Hello World
    runs-on: ubuntu-latest # or macOS-latest, or windows-latest
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-haskell@v1.1
        with:
          ghc-version: '8.8' # Resolves to the latest point release of GHC 8.8
          cabal-version: '3.0.0.0' # Exact version of Cabal
      - run: runhaskell Hello.hs

Basic with Stack:

on: [push]
name: build
jobs:
  runhaskell:
    name: Hello World
    runs-on: ubuntu-latest # or macOS-latest, or windows-latest
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-haskell@v1.1
        with:
          ghc-version: '8.8.3' # Exact version of ghc to use
          # cabal-version: 'latest'. Omitted, but defalts to 'latest'
          enable-stack: true
          stack-version: 'latest'
      - run: runhaskell Hello.hs

Matrix Testing:

on: [push]
name: build
jobs:
  build:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        ghc: ['8.6.5', '8.8.3']
        cabal: ['2.4.1.0', '3.0.0.0']
        os: [ubuntu-latest, macOS-latest, windows-latest]
        exclude:
          # GHC 8.8+ only works with cabal v3+
          - ghc: 8.8.3
            cabal: 2.4.1.0
    name: Haskell GHC ${{ matrix.ghc }} sample
    steps:
      - uses: actions/checkout@v2
      - name: Setup Haskell
        uses: actions/setup-haskell@v1.1
        with:
          ghc-version: ${{ matrix.ghc }}
          cabal-version: ${{ matrix.cabal }}
      - run: runhaskell Hello.hs

Inputs

Name	Required	Description	Type	Default
ghc-version		GHC version to use, ex. latest	string	latest
cabal-version		Cabal version to use, ex. 3.2	string	latest
stack-version		Stack version to use, ex. latest. Stack will only be installed if enable-stack is set.	string	latest
enable-stack		If specified, will setup Stack.	"boolean"	false
stack-no-global		If specified, enable-stack must be set. Prevents installing GHC and Cabal globally	"boolean"	false
stack-setup-ghc		If specified, enable-stack must be set. Runs stack setup to install the specified GHC. (Note: setting this does not imply stack-no-global)	"boolean"	false

Outputs

Name	Description	Type
ghc-path	The path of the ghc executable directory	string
ghc-exe	The path of the ghc executable	string
cabal-path	The path of the cabal executable directory	string
cabal-exe	The path of the cabal executable	string
cabal-store	The path to the cabal store	string
stack-path	The path of the stack executable directory	string
stack-exe	The path of the stack executable	string
stack-root	The path to the stack root	string

Version Support

GHC:

• latest (default, recommended)
• 8.10.2 8.10
• 8.10.1
• 8.8.4 8.8
• 8.8.3
• 8.8.2
• 8.8.1
• 8.6.5 8.6
• 8.6.4
• 8.6.3
• 8.6.2
• 8.6.1
• 8.4.4 8.4
• 8.4.3
• 8.4.2
• 8.4.1
• 8.2.2 8.2
• 8.0.2 8.0
• 7.10.3 7.10

Suggestion: Try to support the three latest major versions of GHC.

Cabal:

• latest (default, recommended)
• 3.2.0.0 3.2
• 3.0.0.0 3.0
• 2.4.1.0 2.4
• 2.4.0.0
• 2.2.0.0 2.2

Recommendation: Use the latest available version if possible.

Stack:

• latest (recommended) -- follows the latest release automatically.
• 2.3.3 2.3
• 2.3.1
• 2.1.3 2.1
• 2.1.1
• 1.9.3.1 1.9
• 1.9.1.1
• 1.7.1 1.7
• 1.6.5 1.6
• 1.6.3.1
• 1.6.1.1
• 1.5.1 1.5
• 1.5.0
• 1.4.0 1.4
• 1.3.2 1.3
• 1.3.0
• 1.2.0 1.2

Recommendation: Use the latest available version if possible.

The full list of available versions of GHC, Cabal, and Stack are as follows:

• Linux/macOS - Cabal and GHC
• Windows - Cabal.
• Windows - GHC
• Linux/macOS/Windows - Stack

Notes regarding internal implementation details:

There are technically some descrepencies here. For example, "8.10.1-alpha1" will work for a ghc version for windows but not for Linux and macOS. For your sanity, I suggest sticking with the version lists above which are supported across all three operating systems.

versions.json exists an internal implementation detail because there's no nice way to otherwise suport short versions. If a version is not inside versions.json, the tool will happily attempt to use exactly what is specified. This is to prevent versions.json from breaking any builds as it is, by design, an incomplete subset of possible versions.

License

The scripts and documentation in this project are released under the MIT License.

Contributions

Contributions are welcome! See the Contributor's Guide.