---
- name: Set environment variables if not set
  ansible.builtin.set_fact:
    cargo_home: "{{ cargo_home | default(xdg_data_home + '/cargo') }}"
    rustup_home: "{{ rustup_home | default(xdg_data_home + '/rustup') }}"

- name: Check if Cargo is installed
  ansible.builtin.command: which cargo
  register: cargo_installed
  failed_when: cargo_installed.rc > 1
  changed_when: false
  environment:
    CARGO_HOME: "{{ cargo_home }}"
    RUSTUP_HOME: "{{ rustup_home }}"

- name: Download Rust installer
  when: cargo_installed.rc != 0
  ansible.builtin.get_url:
    url: http://sh.rustup.rs
    dest: /tmp/sh.rustup.rs
    mode: 0755
    force: true
  tags:
    - rust
    - prereq

- name: Install Rust & Cargo
  when: cargo_installed.rc != 0
  environment:
    CARGO_HOME: "{{ cargo_home }}"
    RUSTUP_HOME: "{{ rustup_home }}"
  ansible.builtin.command:
    argv:
      - /tmp/sh.rustup.rs
      - -y
  changed_when: true
  tags:
    - rust
    - prereq

- name: Set Rustup's toolchain
  ansible.builtin.command:
    argv:
      - "{{ cargo_home }}/bin/rustup"
      - default
      - "{{ rustup_toolchain | default('stable') }}"
  environment:
    CARGO_HOME: "{{ cargo_home }}"
    RUSTUP_HOME: "{{ rustup_home }}"
  changed_when: true
  when: cargo_installed.rc != 0