GitHub Action: Set up hlint.

Downloads a binary of HLint from @ndmitchell/hlint, caches it through @actions/tool-cache, and adds it into PATH.

See also haskell-actions/hlint-run, which will run hlint and represent its output in GitHub annotations.

• version: The HLint version to download. Currently defaults to 3.5.

  Note that on some virtual environments, some versions of hlint need extra prerequisites installed. E.g., on ubuntu-22.04, versions hlint < 3.5 need the libncurses5 library (#128).

• hlint-dir: Resulting directory containing the hlint executable.
• hlint-bin: Location of the hlint executable.
• version: Version of the hlint tool (same as input, if provided).

name: lint
on:
  pull_request:
  push:
    branches:
      - master
      - 'releases/*'

jobs:
  hlint:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4

    - name: 'Set up HLint'
      uses: haskell-actions/hlint-setup@v2

    - name: 'Run HLint'
      uses: haskell-actions/hlint-run@v2
      with:
        path: src/
        fail-on: warning