git_info.rb

# Handles the various git-interactions
module GitInfo
  require 'open3'

  class << self
    def currently_in_git_repo?
      _, _, _, wait_thread = Open3.popen3('git rev-parse --git-dir')
      exit_code = wait_thread.value.exitstatus

      exit_code == 0
    end

    def master?
      branch_name == 'master'
    end

    def branch_name
      @branch_name ||= `git rev-parse --abbrev-ref HEAD`.chomp
    end

    def commit_log
      @commit_log ||= `git log --reverse origin/master.. --format='%h %s'`.chomp
    end

    def commit_count
      commit_log.lines.count
    end

    def shortstat
      `git diff --shortstat origin/master...`.strip
    end

    def issue_urls
      issue_refs.map do |ref|
        "#{Settings.issue_tracker_url}/#{ref}"
      end.join("\n")
    end

    private

    def issue_refs
      merge_base = `git merge-base HEAD master`.chomp

      `git log #{merge_base}..HEAD --format='%b' | grep refs`
        .gsub('refs', '').gsub(',', '').gsub('#', '')
        .strip.split(/\s+/).uniq.sort_by(&:to_i)
    end
  end
end