Ansible role to install a specific ruby version from source

gistfile1.txt

just set ruby_full_version (e.g. 2.1.5, 2.1.0-rc1)

(defaults)
---

ruby_major_version: "{{ruby_full_version | regex_replace('^([0-9]\\.[0-9])(.*)$', '\\\\1')}}"
ruby_minor_version: "{{ruby_full_version | regex_replace('^([0-9]\\.[0-9]\\.[0-9])(.*)$', '\\\\1')}}"
ruby_patch_version: "{{ruby_full_version | regex_replace('^[0-9]\\.[0-9]\\.[0-9](.*)$', '\\\\1') }}"

ruby_minor_tarball_name: "ruby-{{ruby_minor_version}}"
ruby_patch_tarball_name: "ruby-{{ruby_minor_version}}-{{ruby_patch_version}}"
ruby_dest_tarball_name: "{{ruby_full_version}}"

ruby_options: "--with-readline-dir=/usr/lib/x86_64-linux-gnu/libreadline.so"

(tasks)
---

- name: Ruby | make sure ruby version to install is greater than 1.9.3
  fail: msg='you cannot install a version of ruby older than 1.9.3'
  when: ruby_full_version | version_compare('1.9.3', '<')

- name: Ruby | checking installed version of ruby
  shell: /usr/bin/test "$(ruby -v | awk '{print $2}' 2> /dev/null)" = {{ruby_full_version}}
  register: wanted_version_installed
  ignore_errors: True

- name: Ruby | install requirements
  apt: name='{{item}}' force='yes' install_recommends='no' state='latest' update_cache='yes'
  with_items:
    - 'git-core'
    - 'curl'
    - 'zlib1g-dev'
    - 'build-essential'
    - 'libssl-dev'
    - 'libreadline-dev'
    - 'libyaml-dev'
    - 'libsqlite3-dev'
    - 'sqlite3'
    - 'libxml2-dev'
    - 'libxslt1-dev'
    - 'libcurl4-openssl-dev'
    - 'python-software-properties'
    - 'python-httplib2'
  when: wanted_version_installed.rc == 1

- name: Ruby | check if patch version exists for download
  uri: url="http://ftp.ruby-lang.org/pub/ruby/{{ruby_major_version}}/{{ruby_patch_tarball_name}}.tar.gz" 
       method='GET'
       follow_redirects='none'
       return_content='no'
  when: wanted_version_installed.rc == 1
  register: patch_version
  ignore_errors: True

- name: Ruby | check for minor version if patch version doesn't exist
  uri: url="http://ftp.ruby-lang.org/pub/ruby/{{ruby_major_version}}/{{ruby_minor_tarball_name}}.tar.gz"
       method='GET'
       follow_redirects='none'
       return_content='no'
  register: minor_version
  when: wanted_version_installed.rc == 1 and patch_version.status == 404

- name: Ruby | set download tarball 
  set_fact: ruby_download_tarball_name="{{ruby_patch_tarball_name}}"
  when: wanted_version_installed.rc == 1 and minor_version is defined and minor_version.skipped == true

- name: Ruby | set download tarball
  set_fact: ruby_download_tarball_name="{{ruby_minor_tarball_name}}"
  when: wanted_version_installed.rc == 1 and minor_version is defined and minor_version.status == 200

- name: Ruby | grab correct ruby source 
  get_url: url="http://ftp.ruby-lang.org/pub/ruby/{{ruby_major_version}}/{{ruby_download_tarball_name}}.tar.gz"
           dest='{{work_dir}}/{{ruby_download_tarball_name}}.tar.gz'
  when: wanted_version_installed.rc == 1 and ruby_download_tarball_name is defined

- name: Ruby | unpack ruby source
  unarchive: src='{{work_dir}}/{{ruby_download_tarball_name}}.tar.gz'
             dest='{{work_dir}}'
             copy='no'
  when: wanted_version_installed.rc == 1 and ruby_download_tarball_name is defined

- name: Ruby | configure and compile ruby source
  shell: './configure {{ruby_options}} && make && make install chdir={{work_dir}}/{{ruby_download_tarball_name}}'
  when: wanted_version_installed.rc == 1 and ruby_download_tarball_name is defined

- name: Ruby | get ruby version
  shell: "ruby -v | awk '{print $2}'"
  register: ruby_installed_version

- name: Ruby | print version
  debug: msg="{{ruby_installed_version.stdout}}"