Class: Dumon::XrandrManager

Inherits:
OutDeviceManager show all
Defined in:
lib/dumon/omanager.rb

Overview

This class manages output devices via xrandr system tool.

Instance Attribute Summary

Attributes inherited from OutDeviceManager

#outputs, #stool

Instance Method Summary collapse

Methods inherited from OutDeviceManager

#common_resolutions, #default_resolution, #reset, #switch

Methods included from Rrutils::Options

#assert, #keys_to_sym, #verify_and_sanitize_options, #verify_options

Constructor Details

#initialize ⇒ XrandrManager

Constructor. Checks whether the ‘xrandr’ system tool is there.



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# File 'lib/dumon/omanager.rb', line 159

def initialize
  paths = ['/usr/bin/xrandr', 'xrandr']
  paths.each do |path|
    begin
      `#{path}`
      @stool = path
      Dumon.logger.info "System tool found: #{path}"
      break
    rescue  => e
      Dumon.logger.warn "unknown tool: #{path}, message: #{e.message}"
    end
  end

  raise "no system tool found, checked for #{paths}" if self.stool.nil?

  # just to check if it works
  self.read
end

Instance Method Details

#read ⇒ Object

:nodoc:



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# File 'lib/dumon/omanager.rb', line 178

def read #:nodoc:
  @outputs = nil # clear previous info
  rslt = {}

  output = nil

  xrandr_out = `#{self.stool} -q`
  xrandr_out.each_line do |line|
    if line =~ /^[\w-]+ connected /
      output = line[/^[\w-]+/]
      rslt[output] = {:resolutions => []}
    end
    if line =~ /^\s*[0-9x]+\s+\d+/ and not output.nil?
      resolution = line[/[0-9x]+/]
      rslt[output][:default] = resolution if line.include? '+'
      rslt[output][:current] = resolution if line.include? '*'
      rslt[output][:resolutions] << resolution
    end
  end
  # BF 13 not all outputs provide default resolution
  rslt.each do |output,out_meta|
    # consider the first resolution (the highest) as default
    out_meta[:default] = out_meta[:resolutions].first unless out_meta.include? :default
  end
  Dumon::logger.debug "Outputs found: #{rslt}"

  # verify structure of readed infos
  assert(!rslt.empty?, 'no outputs found')
  rslt.each do |output,out_meta|
    verify_options(out_meta, {:resolutions=>:mandatory, :default=>:mandatory, :current=>:optional})
    assert(out_meta[:resolutions].size >= 1, "no resolution found, output=#{output}")
  end

  @outputs = rslt
  rslt
end