module Pronto

def self.diff(repo_path, commit)
  repo = Rugged::Repository.new(repo_path)
  commit ||= 'master'
  repo.diff(commit, repo.head.target)
end

def self.gem_names
  gems = Gem::Specification.find_all.select do |gem|
    if gem.name =~ /^pronto-/
      true
    elsif gem.name != 'pronto'
      runner_path = File.join(gem.full_gem_path, "lib/pronto/#{gem.name}.rb")
      File.exists?(runner_path)
    end
  end
  gems.map { |gem| gem.name.sub(/^pronto-/, '') }
      .uniq
      .sort
end

def self.run(commit = 'master', repo_path = '.', formatter = nil)
  patches = diff(repo_path, commit)
  result = run_all_runners(patches)
  formatter ||= default_formatter
  formatter.format(result)
end

def self.run_all_runners(patches)
  Runner.runners.map do |runner|
    runner.new.run(patches)
  end.flatten.compact
end

def default_formatter
  Formatter::TextFormatter.new
end