- name: Check cabal version
  command: cabal --version
  failed_when: false
  register: _cabal_version

- name: Install cabal
  package:
    name: cabal-install
    state: present
  become: yes
  when: "_cabal_version.rc != 0"

- name: Check package
  stat:
    path: "~/.cabal/packages"
  register: _cabal_packages

- name: Update package list
  command: cabal update
  when: not _cabal_packages.stat.exists