Secure Eraser.dropzone

#!/usr/bin/ruby
 
# Dropzone Destination Info
# Name: Secure Eraser
# Description: Overwrite files three times and then erases them.
# Handles: NSFilenamesPboardType
# Creator: Grzegorz Wilk
# URL: http://www.grzegor.pl
# IconURL: http://upload.wikimedia.org/wikipedia/commons/e/ee/Erase_stub.png
 

def dragged
  output = `./CocoaDialog yesno-msgbox --text "Do you REALLY want to delete dropped files?" --no-cancel`
  if output.to_i == 1 
    $dz.begin("Erasing files (may take a while for large files)")
    $dz.determinate(true)

    # determine size of all files 
    whole_size = 0
    percent = 0
    undeletable = false
    $items.each {
      |item| whole_size += File.size(item)
    }
  
    # delete them one by one in
    $items.each do |item| 
        file_size = File.size(item)
        exit = system('rm -rfP "'+item+'"')
        if exit == false
          undeletable = true 
        end
        percent += file_size * 100 / whole_size
        $dz.percent(percent)
    end
 
    if undeletable == true
        $dz.finish("Error! See your clipboard.")
        $dz.url("http://docs.google.com/View?id=dff433k2_45d9qff4hs")
    else
        $dz.finish("Files erased successfully.")
        $dz.url(false)
    end
  end
end