This guide covers configuring continuous integration pipelines for Haskell projects. If you’re new to Drone please read our Tutorial and build configuration guides first.

Build and Test

In the below example we demonstrate a pipeline that executes cabal commands. These commands are executed inside the Haskell Docker container, downloaded at runtime from DockerHub.

kind: pipeline
type: kubernetes
name: default

steps:
- name: test
  image: haskell
  commands:
  - cabal install --only-dependencies --enable-tests
  - cabal configure --enable-tests
  - cabal build
  - cabal test

Please note that you can use any Docker image in your pipeline from any Docker registry. You can use the official Haskell images, or your can bring your own.

Test Multiple Versions

You can use Drone’s multi-pipeline feature to concurrently test against multiple versions of Haskell. This is equivalent to matrix capabilities found in other continuous integration systems.

---
kind: pipeline
type: kubernetes
name: haskell8

steps:
- name: test
  image: haskell:8
  commands:
  - cabal install --only-dependencies --enable-tests
  - cabal configure --enable-tests
  - cabal build
  - cabal test

---
kind: pipeline
type: kubernetes
name: haskell7

steps:
- name: test
  image: haskell:7
  commands:
  - cabal install --only-dependencies --enable-tests
  - cabal configure --enable-tests
  - cabal build
  - cabal test

...

If you find this syntax too verbose we recommend using jsonnet. If you are unfamiliar with jsonnet please read our guide.

local Pipeline(version) = {
  kind: "pipeline",
  type: "kubernetes",
  name: "haskell"+version,
  steps: [
    {
      name: "test",
      image: "haskell:"+version,
      commands: [
        "cabal install --only-dependencies --enable-tests",
        "cabal configure --enable-tests",
        "cabal build",
        "cabal test"
      ]
    }
  ]
};

[
  Pipeline("7"),
  Pipeline("8"),
]