Class: Grada::Gnuplot

Inherits:
Object
  • Object
show all
Defined in:
lib/grada/types/gnuplot.rb

Defined Under Namespace

Classes: DataSet, Plot, Style

Class Method Summary collapse

Class Method Details

.candidate?(candidate) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/grada/types/gnuplot.rb', line 8

def self.candidate?(candidate)
  return candidate if File::executable? candidate
  
  ENV['PATH'].split(File::PATH_SEPARATOR).each do |dir|
    possible_candidate = File::join dir, candidate.strip
  
    return possible_candidate if File::executable? possible_candidate
  end
  
  nil
end

.find_exec(bin) ⇒ Object 



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# File 'lib/grada/types/gnuplot.rb', line 20

def self.find_exec(bin)
  bin_list = RUBY_PLATFORM =~ /mswin|mingw/ ? [bin, "#{bin}.exe"] : [bin]
  
  bin_list.each do |c|
    exec = candidate?(c)
    return exec if exec
  end
  
  nil
end

.gnuplot ⇒ Object

Raises:



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# File 'lib/grada/types/gnuplot.rb', line 31

def self.gnuplot
  gnu_exec = find_exec( ENV['RB_GNUPLOT'] || 'gnuplot' )
  raise Grada::NoGnuPlotExecutableFound unless gnu_exec
  gnu_exec
end

.open(persist = true, &block) ⇒ Object 



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# File 'lib/grada/types/gnuplot.rb', line 37

def self.open(persist = true, &block)
  gnuplot_cmd = gnuplot
  
  commands = yield
  
  output = StringIO.new
  Open3::popen3(gnuplot_cmd, '-persist') do |data_in, data_out, stderr, wait_th|
    data_in << commands[:plot_settings]
    data_in << commands[:plot_data]
  
    data_in.flush
    sleep 1
    
    while true do
      window = IO::popen('xprop -name "Gnuplot" WM_NAME 2>/dev/null').gets
      break unless window
      sleep 1
    end
    data_in.close
    data_out.close
    stderr.close
  
    output.write(wait_th.value.exitstatus)
  end
  
  output.string
end