module Harrison

# File lib/harrison.rb, line 48
def self.config(opts={})
  @@config ||= Harrison::Config.new(opts)

  if block_given?
    yield @@config
  else
    @@config
  end
end

# File lib/harrison.rb, line 67
def self.deploy(opts={})
  @@task_runners[:deploy] ||= Harrison::Deploy.new(opts)

  # Parse options if this is the target command.
  @@task_runners[:deploy].parse(@@args.dup) if @@runner && @@runner.call == @@task_runners[:deploy]

  yield @@task_runners[:deploy]
end

# File lib/harrison.rb, line 17
def self.invoke(args)
  @@args = args.freeze
  @@task_runners = {
    package: nil,
    deploy: nil,
  }

  abort("No command given. Run with --help for valid commands and options.") if @@args.empty?

  # Catch root level --help
  Harrison::Base.new.parse(@@args.dup) and exit(0) if @@args[0] == '--help'

  # Find Harrisonfile.
  hf = find_harrisonfile || abort("ERROR: Could not find a Harrisonfile in this directory or any ancestor.")

  # Find the class to handle command.
  @@runner = find_runner(@@args[0]) || abort("ERROR: Unrecognized command \"#{@@args[0]}\".")

  # Eval the Harrisonfile.
  eval_script(hf)

  # Invoke command and cleanup afterwards.
  begin
    @@runner.call.run
  rescue => e
    raise e
  ensure
    @@runner.call.close
  end
end

# File lib/harrison.rb, line 58
def self.package(opts={})
  @@task_runners[:package] ||= Harrison::Package.new(opts)

  # Parse options if this is the target command.
  @@task_runners[:package].parse(@@args.dup) if @@runner && @@runner.call == @@task_runners[:package]

  yield @@task_runners[:package]
end

# File lib/harrison.rb, line 90
def self.eval_script(filename)
  proc = Proc.new {}
  eval(File.read(filename), proc.binding, filename)
end

# File lib/harrison.rb, line 79
def self.find_harrisonfile
  previous = nil
  current  = File.expand_path(Dir.pwd)

  until !File.directory?(current) || current == previous
    filename = File.join(current, 'Harrisonfile')
    return filename if File.file?(filename)
    current, previous = File.expand_path("..", current), current
  end
end

# File lib/harrison.rb, line 95
def self.find_runner(command)
  command = 'deploy' if command == 'rollback'

  lambda { @@task_runners[command.to_sym] } if @@task_runners.has_key?(command.to_sym)
end