This guide covers configuring continuous integration pipelines for Crystal 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 shards install and crystal spec commands. These commands are executed inside the crystal Docker container, downloaded at runtime from DockerHub.

kind: pipeline
type: kubernetes
name: default

steps:
- name: test
  image: crystallang/crystal
  commands:
  - shards install
  - crystal spec

Please note that you can use any Docker image in your pipeline from any Docker registry. You can use the official crystal 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 Crystal. This is equivalent to matrix capabilities found in other continuous integration systems.

---
kind: pipeline
type: kubernetes
name: nightly

steps:
- name: test
  image: crystallang/crystal:nightly
  pull: always
  commands:
  - shards install
  - crystal spec

---
kind: pipeline
type: kubernetes
name: latest

steps:
- name: test
  image: crystallang/crystal:latest
  commands:
  - shards install
  - crystal spec

...

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

local Pipeline(name, image) = {
  kind: "pipeline",
  type: "kubernetes",
  name: name,
  steps: [
    {
      name: "test",
      image: image,
      commands: [
        "shards install",
        "crystal spec"
      ]
    }
  ]
};

[
  Pipeline("nightly", "crystal:nightly"),
  Pipeline("latest", "crystal:latest"),
]