---
# Run `bundle gem <gem_name>` targeting a temp directory, then merge the
# results into `gem_root`.

- name: >-
    Create a tempdir to run `bundle gem {{ gem_name }}` in.
  tempfile:
    state: directory
    suffix: gem
  register: tempdir
  changed_when: false


- name: >-
    Run `bundle gem {{ gem_name }}` in tempdir `{{ tempdir.path }}`.
  stream:
    cmd: >-
      bundle gem %{gem_name}
    kwds:
      gem_name: >-
        {{ gem_name }}
    chdir: >-
      {{ tempdir.path }}
  changed_when: false


- name: >-
    Get rid of the `.git` directory and `.gitignore` file since we don't want 
    to merge them.
  with_items:
  - .git
  - .gitignore
  file:
    path: >-
      {{ tempdir.path | path_join(gem_name, item) }}
    state: absent
  changed_when: false


- name: >-
    Create destination directories in gem root `{{ gem_root }}`.
  with_filetree: >-
    {{ tempdir.path | path_join(gem_name) }}
  when: item.state == 'directory'
  file:
    dest: >-
      {{ gem_root | path_join(item.path) }}
    state: directory
  changed_when: false


- name: >-
    Copy files from tempdir to gem root `{{ gem_root }}`.
  with_filetree: >-
    {{ tempdir.path | path_join(gem_name) }}
  when: item.state == 'file'
  copy:
    src: >-
      {{ item.src }}
    dest: >-
      {{ gem_root | path_join(item.path) }}
    force: >-
      {{ force }}


# Prob don't need this, but what the hell...
#       
# From
# 
#   http://docs.ansible.com/ansible/latest/playbooks_loops.html#looping-over-filetrees
# 
# along with the rest of it. Seem to work for relative symlinks.
# 
- name: >-
    Recreate symlinks from tempdir to gem root `{{ gem_root }}`.
  with_filetree: >-
    {{ tempdir.path | path_join(gem_name) }}
  when: item.state == 'link'
  file:
    src: >-
      {{ item.src }}
    dest: >-
      {{ gem_root | path_join(item.path) }}
    state: link
    force: >-
      {{ force }}
    mode: >-
      {{ item.mode }}


- name: >-
    Remove the temp dir at `{{ tempdir.path }}`.
  file:
    path: >-
      {{ tempdir.path }}
    state: absent
  changed_when: false