Class: Backend

Inherits:
Object show all
Defined in:
lib/backends/backend.rb

Overview

Base class from which to subclass other backends. Subclasses must implement the run method that gets passed a file name and must (0) set the @layers instance var to a hash of layers containing the metadata gathered and call the write_layers method when finished to save that data.

Class Method Summary collapse

Class Method Details

.run(file) ⇒ Object 



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# File 'lib/backends/backend.rb', line 12

def run(file)
  raise "Base Backend class shouldn't be used for real augmentation."
end

.with_no_output ⇒ Object

Suppress STDOUT while a block runs.



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# File 'lib/backends/backend.rb', line 27

def with_no_output
  old_stdout = $stdout.clone
  $stdout.reopen(File.new('/dev/null','w'))
  yield
  $stdout.reopen(old_stdout)
end

.write_layers ⇒ Object

Output the @layers hash as JSON where augment expects it.



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# File 'lib/backends/backend.rb', line 17

def write_layers
  @layers.each do |file, layers|
    FileUtils.mkpath(File.dirname(file) + '/.augment')
    File.open(Augment.augment_path(file), 'w') do |f|
      f.puts "[#{layers.map{ |l| l.to_json }.join(", \n")}]"
    end
  end
end