Class: Process::Pipeline::Step

Inherits:
Struct
  • Object
show all
Defined in:
lib/process/pipeline/step.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#command ⇒ Object

Returns the value of attribute command

Returns:

  • (Object) —

    the current value of command



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# File 'lib/process/pipeline/step.rb', line 26

def command
  @command
end

#tail ⇒ Object

Returns the value of attribute tail

Returns:

  • (Object) —

    the current value of tail



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# File 'lib/process/pipeline/step.rb', line 26

def tail
  @tail
end

Instance Method Details

#+(pipeline) ⇒ Object 



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# File 'lib/process/pipeline/step.rb', line 136

def + pipeline
	pipeline.dup(self)
end

#call(*command) ⇒ Object 



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# File 'lib/process/pipeline/step.rb', line 35

def call(*command)
	self.class.new(self, command)
end

#dup(tail) ⇒ Object 



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# File 'lib/process/pipeline/step.rb', line 27

def dup(tail)
	if self.tail
		self.class.new(self.tail.dup(tail), self.command)
	else
		self.class.new(tail, self.command)
	end
end

#each_line(*args, &block) ⇒ Object 



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# File 'lib/process/pipeline/step.rb', line 96

def each_line(*args, &block)
	return to_enum(:each_line, *args) unless block_given?
	
	read(**args[0]) do |output|
		output.each_line(&block)
	end
end

#inspect ⇒ Object 



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# File 'lib/process/pipeline/step.rb', line 132

def inspect
	self.steps.collect(&:to_s).join(" | ")
end

#read(input: nil, error: $stderr) ⇒ Object 



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# File 'lib/process/pipeline/step.rb', line 76

def read(input: nil, error: $stderr)
	pipe = IO.pipe
	
	Process::Group.wait do |group|
		self.spawn(group, input, pipe[1], error)
	end
	
	pipe[1].close
	
	if block_given?
		yield pipe[0]
	else
		buffer = pipe[0].read
	end
	
	pipe[0].close
	
	return buffer
end

#spawn(group, input, output, error) ⇒ Object 



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# File 'lib/process/pipeline/step.rb', line 39

def spawn(group, input, output, error)
	if self.command.nil?
		if tail = self.tail
			return tail.call(group, input, output, error)
		else
			return nil
		end
	end
	
	if Hash === self.command.last
		*command, options = self.command
	else
		command = self.command
		options = {}
	end
	
	if self.tail
		pipe = IO.pipe
		
		self.tail.spawn(group, input, pipe[1], error)
		pipe[1].close
		
		options[:in] = pipe[0]
	elsif input
		options[:in] = input
	end
	
	options[:out] = output
	
	# puts "run #{command.inspect} #{options.inspect}"
	group.run(*command, **options) do |exit_status|
		unless exit_status.success?
			raise CommandError.new(self, exit_status)
		end
	end
end

#steps {|_self| ... } ⇒ Object

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/process/pipeline/step.rb', line 114

def steps(&block)
	return to_enum(:steps) unless block_given?
	
	if self.tail
		self.tail.each(&block)
	end
	
	yield self
end

#to_s ⇒ Object 



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# File 'lib/process/pipeline/step.rb', line 124

def to_s
	if self.command
		self.command.join(" ")
	else
		nil
	end
end

#write(path, input: nil, error: $stderr) ⇒ Object 



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# File 'lib/process/pipeline/step.rb', line 104

def write(path, input: nil, error: $stderr)
	File.open(path, "w") do |file|
		Process::Group.wait do |group|
			self.spawn(group, input, file, error)
		end
	end
	
	return self
end