class GemHadar

def version_diff_task

between the versions, and shows the changes.
- A :diff task that calculates the version range, displays a colored diff
and outputs the sorted list of versions.
- A :list task that fetches all git tags, ensures the operation succeeds,

This method sets up two subtasks under the :version namespace:

git version differences.
The version_diff_task method defines Rake tasks for listing and displaying 
def version_diff_task
  namespace :version do
    desc "List all versions in order"
    task :list do
      system 'git fetch --tags'
      $?.success? or exit $?.exitstatus
      puts versions
    end
    desc "Displaying the diff from env var VERSION to the next version or HEAD"
    task :diff do
      start_version, end_version = determine_version_range
      puts color(172) { "Showing diff from version %s to %s:" % [ start_version, end_version ] }
      puts `git diff --color=always #{start_version}..#{end_version}`
    end
  end
end