Started from https://github.com/radar/buildkite-notifier/blob/master/buildkite.rb. Still WIP.

buildkite.rb

#!/usr/bin/env ruby

require 'httparty'

def notify(title: "Buildkite", message:, icon:, web_url:)
  command = "terminal-notifier -title '#{title}' -message '#{message}' -appIcon ~/.buildkite/#{icon}.png"
  command += " -open '#{web_url}'" if web_url

  `#{command}`
end

token = ENV.fetch("BUILDKITE_TOKEN")
pipeline, build_number = ARGV[0..1]
url = "https://api.buildkite.com/v2/organizations/everyday-hero/pipelines/#{pipeline}/builds/#{build_number}"
state = "unknown"

until ["passed", "failed", "blocked"].include?(state)
  resp = HTTParty.get(url, headers: { "Authorization" => "Bearer #{token}" })
  if resp.code != 200
    notify(
      message: "Received a #{resp.code} response from Buildkite. Check your arguments are correct.",
      icon: "failed",
    )

    exit(1)
  end

  web_url = resp["web_url"]
  state = resp["state"]

  sleep(5)
end

case state
when "passed"
  notify(
    title: "Buildkite: #{pipeline}",
    message: "##{build_number} passed",
    icon: "passed",
    web_url: web_url,
  )
when "failed"
  notify(
    title: "Buildkite: #{pipeline}",
    message: "##{build_number} passed",
    icon: "failed",
    web_url: web_url,
  )
end