module RakeFlowVisualizer

# File lib/rake_flow_visualizer.rb, line 8
def self.parse(text)
  lines = text.split("\n").map(&:strip)
  parent = nil
  lines.each do |line|
    if line[0..4] == 'rake '
      parent_name = line[5..-1]
      parent = Task.find_or_create(parent_name)
      next
    end
    raise unless parent
    dependency_name = line
    dependency = Task.find_or_create(dependency_name)
    parent.dependencies << dependency
  end
  Task.all.each do |task|
    print_task(0, task, [])
    puts
  end
end

# File lib/rake_flow_visualizer.rb, line 28
def self.print_task(depth, task, ignore)
  return if ignore.include?(task)
  ignore << task
  print "|" * depth
  puts task
  task.dependencies.each { |dependency| print_task(depth + 1, dependency, ignore) }
end

# File lib/rake_flow_visualizer.rb, line 36
def self.run
  _stdout, status = Open3.capture2('rake --help')
  raise 'can not find rake, is it installed?' unless status.success?
  stdout, status = Open3.capture2('rake -P')
  unless status.success?
    puts stdout
    raise "executing 'rake -P' resulted in an exception"
  end
  puts "--- Rake Flow Visualizer ---"
  puts "The following shows a list for every task that can be run."
  puts "Each list will have the requisites for the task and the order that they will be executed."
  puts
  puts
  parse(stdout)
end