Class: OverrideDlg

Inherits:
Object
  • Object
show all
Includes:
BasicLogging
Defined in:
lib/override.rb

Constant Summary collapse

XTERM = 
'xterm'
WHIPTAIL =

TERMINAL = ‘x-terminal-emulator’

'whiptail'
YAD = 
'yad'
ZENITY = 
'zenity'
@@Executables =

The external programs which are supported for the time. They will be run in a new process (IO.popen() ). The first program from this array, which is found in the Path, will be used. Whiptail and a pure ruby dialog necessitate that xterm be found, too.

[YAD, ZENITY, WHIPTAIL, XTERM]

Constants included from BasicLogging

BasicLogging::DEBUG, BasicLogging::ERROR, BasicLogging::FATAL, BasicLogging::INFO, BasicLogging::Levels, BasicLogging::UNKNOWN, BasicLogging::WARN

Class Attribute Summary collapse

Attributes included from BasicLogging

#log_level, #target

Instance Method Summary collapse

Methods included from BasicLogging

is_muted?, #log, mute, #set_level, #set_target

Constructor Details

#initialize ⇒ OverrideDlg

Create the object



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# File 'lib/override.rb', line 49

def initialize
  @config = Configuration::instance
  # find the supported programs 
  @executables = @@Executables.select do |ex_name|
    ENV['PATH'].split(':').each do |dir_name| 
      Dir.entries(dir_name).include?(ex_name) 
    end
  end
  # As we are calling external programs anyway, 
  # why not continue with that....
  @xmsg = ENV['PATH'].split(':').any? {|d| Dir.children(d).include?('xmessage')}
end

Class Attribute Details

.cvars ⇒ Object (readonly)

Returns the value of attribute cvars.



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# File 'lib/override.rb', line 45

def cvars
  @cvars
end

Instance Method Details

#show ⇒ Object

display a dialog and return the new options.



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# File 'lib/override.rb', line 63

def show
  if(@executables && !@executables.empty?)
    debug('found executables ' << @executables.join(', ') )
    opts = nil
    begin
      if has?(YAD)
        return yad_dlg.split.collect {|o| o.to_s}.join(' ')
      elsif has?(ZENITY)
        return zenity_dlg.split.collect {|o| o.to_s}.join(' ')
      elsif has? XTERM
        if has?(WHIPTAIL)
          return whiptail_dlg.split.collect {|o| o.to_s}.join(' ')
        else
          debug 'using naked xterm'
          return ruby_dlg.split.collect {|o| o.to_s}.join(' ')
        end
      end
    rescue SystemExit
      msg = 'Process is cancelled (SystemExit)'
      info msg
      exit true
    rescue Exception => ex
      msg = 'Error upon showing dialog ' << ex.message
      error(msg)
    end

    # no program to show the dialog 
  else 
    msg = "#{File.basename($0)}: No suitable executable found to display the dialog"
    warn msg
    # if xmessage is available, give the user a last chance.
    if @xmsg
      io = IO.popen('xmessage -buttons continue:0,abort:1 -default abort -print ' << msg) 
      Process.wait(io.pid)
      # ATTN! read io only once!
      exit if ('continue' != io.read.to_s.strip )
      debug('continue with configured settings')
    end
  end
end