Class: Buildbox::Command

Inherits:
Object
  • Object
show all
Defined in:
lib/buildbox/command.rb

Defined Under Namespace

Classes: Result

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(command, options = {}) ⇒ Command

Returns a new instance of Command.



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# File 'lib/buildbox/command.rb', line 12

def initialize(command, options = {})
  @command       = command
  @directory     = options[:directory] || "."
  @read_interval = options[:read_interval] || 5
end

Class Method Details

.run(command, options = {}, &block) ⇒ Object 



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# File 'lib/buildbox/command.rb', line 8

def self.run(command, options = {}, &block)
  new(command, options).run(&block)
end

Instance Method Details

#run(&block) ⇒ Object 



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# File 'lib/buildbox/command.rb', line 18

def run(&block)
  output = ""
  read_io, write_io, pid = nil

  # spawn the process in a pseudo terminal so colors out outputted
  read_io, write_io, pid = PTY.spawn("cd #{expanded_directory} && #{@command}")

  # we don't need to write to the spawned io
  write_io.close

  loop do
    fds, = IO.select([read_io], nil, nil, read_interval)
    if fds
      # should have some data to read
      begin
        chunk         = read_io.read_nonblock(10240)
        cleaned_chunk = UTF8.clean(chunk)

        output << chunk
        yield cleaned_chunk if block_given?
      rescue Errno::EAGAIN, Errno::EWOULDBLOCK
        # do select again
      rescue EOFError, Errno::EIO # EOFError from OSX, EIO is raised by ubuntu
        break
      end
    end
    # if fds are empty, timeout expired - run another iteration
  end

  # we're done reading, yay!
  read_io.close

  # just wait until its finally finished closing
  Process.waitpid(pid)

  # the final result!
  Result.new(output.chomp, $?.exitstatus)
end