A solution for the question posted by Lark Work. http://www.ruby-forum.com/topic/1369589

another_ppid.rb

# Another solution with Shoes::Widget

class SomeDataProcessing < Shoes::Widget
  Person = Struct.new :name, :last_name, :phone_number, :birthday, :city, :adress
  def self.openOn(p_file)
    new(p_file)
  end
  def initialize(p_file)
    @file    = p_file
    @persons = {}
    loadData
  end
  def listData
    @persons.keys.sort.each {|p| showlistData(p)}
  end
  def loadData
    File.foreach(@file) do |line|
      name, last_name, phone_number, birthday, city, adress = line.chomp.split(",")
      @persons[name] = Person.new(name, last_name, phone_number, birthday, city, adress)
    end
  end
  def showData(p_name)
    person = @persons[p_name]
    if person.nil?
    then
      @show_text2 = "#{p_name} not in database."
    end
    stack do
      @show_text2 = ["Name: #{person.name} #{person.last_name}", 
        "Phonenumber: #{person.phone_number}", 
        "Birthday: #{person.birthday}", 
        "City: #{person.city}", 
        "Adress: #{person.adress}"].join("\n")
    end
    edit_box @show_text2, :width => 250, :height => 200, :top => 140, :left => 380
  end
  def showlistData(p_name)
    person = @persons[p_name]
    if person.nil?
    then
      @show_text3 = "#{p_name} not in database."
    end
    @show_text3 = "#{person.name} #{person.last_name}"
    edit_box @show_text3, :width => 250, :height => 200, :top => 140, :left => 380
  end
end
  
Shoes.app :title => "PPID", :height => 400, :width => 700 do
  @ds = some_data_processing("PPIDdata.txt")
  background black, :height => 60
  background gradient(rgb(1.0, 1.0, 1.0, 0.7), rgb(1.0, 1.0, 1.0, 0.0))
  title "PPID", :align => "center", :stroke => white
  caption "Personal: Person Info Database", :top => 80, :left => 20
  stack :top => 130, :left => 50 do
    para "Add to database:"
    flow do
      inscription "Name:  "
      @name = edit_line :width => 120
    end
    flow do
      inscription "Lastname:  "
      @lastname = edit_line :width => 120
    end
    flow do
      inscription "Phonenumber:  "
      @phonenumber = edit_line :width => 80
    end
    flow do
      inscription "Birthday:  "
      @month = edit_line :width => 30
      @day = edit_line :width => 30
      @year = edit_line :width => 50
    end
    flow do
      inscription "City:  "
      @city = edit_line :width => 120
    end
    flow do
      inscription "Streetname:  "
      @streetname = edit_line :width => 120
      @housenumber = edit_line :width => 50
    end
    @save_button = button "Save" do
      open('PPIDdata.txt', 'a+') { |f|
        f.puts "#{@name.text},#{@lastname.text},#{@phonenumber.text},#{@month.text}-#{@day.text}-#{@year.text},#{@city.text},#{@streetname.text},#{@housenumber.text}"}
      stack do
        @show_text = ["Name: #{@name.text} #{@lastname.text}", 
          "Phonenumber: #{@phonenumber.text}", 
          "Birthday: #{@month.text}-#{@day.text}-#{@year.text}", 
          "City: #{@city.text}", 
          "Adress: #{@streetname.text} #{@housenumber.text}"].join("\n")
      end
      edit_box @show_text, :width => 250, :height => 200, :top => 140, :left => 380
    end
  end
  edit_box "", :width => 250, :height => 200, :top => 140, :left => 380

  stack :top => 85, :left => 380 do
    flow do
      name = edit_line :width => 150
      button "Search" do
        #ds = SomeDataProcessing.openOn("PPIDdata.txt")
        @ds.showData(name.text)
      end
      button "List" do
        #dl = SomeDataProcessing.openOn("PPIDdata.txt")
        @ds.listData
      end
    end
  end
end

ppid.rb

# A solution with a global variable $app

class SomeDataProcessing
  Person = Struct.new :name, :last_name, :phone_number, :birthday, :city, :adress
  def self.openOn(p_file)
    new(p_file)
  end
  def initialize(p_file)
    @file    = p_file
    @persons = {}
    loadData
  end
  def listData
    @show_text3 = ''
    @persons.keys.sort.each {|p| showlistData(p)}
    $app.instance_variable_get(:@eb).text = @show_text3
  end
  def loadData
    File.foreach(@file) do |line|
      name, last_name, phone_number, birthday, city, adress = line.chomp.split(",")
      @persons[name] = Person.new(name, last_name, phone_number, birthday, city, adress)
    end
  end
  def showData(p_name)
    person = @persons[p_name]
    if person.nil?
    then
      @show_text2 = "#{p_name} not in database."
    else
      @show_text2 = ["Name: #{person.name} #{person.last_name}", 
        "Phonenumber: #{person.phone_number}", 
        "Birthday: #{person.birthday}", 
        "City: #{person.city}", 
        "Adress: #{person.adress}"].join("\n")
    end
    $app.instance_variable_get(:@eb).text = @show_text2
  end
  def showlistData(p_name)
    person = @persons[p_name]
    if person.nil?
    then
      @show_text3 << "#{p_name} not in database."
    else
      @show_text3 << "#{person.name} #{person.last_name}\n"
    end
  end
end
  
Shoes.app :title => "PPID", :height => 400, :width => 700 do
  $app = self
  background black, :height => 60
  background gradient(rgb(1.0, 1.0, 1.0, 0.7), rgb(1.0, 1.0, 1.0, 0.0))
  title "PPID", :align => "center", :stroke => white
  caption "Personal: Person Info Database", :top => 80, :left => 20
  stack :top => 130, :left => 50 do
    para "Add to database:"
    flow do
      inscription "Name:  "
      @name = edit_line :width => 120
    end
    flow do
      inscription "Lastname:  "
      @lastname = edit_line :width => 120
    end
    flow do
      inscription "Phonenumber:  "
      @phonenumber = edit_line :width => 80
    end
    flow do
      inscription "Birthday:  "
      @month = edit_line :width => 30
      @day = edit_line :width => 30
      @year = edit_line :width => 50
    end
    flow do
      inscription "City:  "
      @city = edit_line :width => 120
    end
    flow do
      inscription "Streetname:  "
      @streetname = edit_line :width => 120
      @housenumber = edit_line :width => 50
    end
    @save_button = button "Save" do
      open('PPIDdata.txt', 'a+') { |f|
        f.puts "#{@name.text},#{@lastname.text},#{@phonenumber.text},#{@month.text}-#{@day.text}-#{@year.text},#{@city.text},#{@streetname.text},#{@housenumber.text}"}
      stack do
        @show_text = ["Name: #{@name.text} #{@lastname.text}", 
          "Phonenumber: #{@phonenumber.text}", 
          "Birthday: #{@month.text}-#{@day.text}-#{@year.text}", 
          "City: #{@city.text}", 
          "Adress: #{@streetname.text} #{@housenumber.text}"].join("\n")
      end
      edit_box @show_text, :width => 250, :height => 200, :top => 140, :left => 380
    end
  end
  @eb = edit_box "", :width => 250, :height => 200, :top => 140, :left => 380

  stack :top => 85, :left => 380 do
    flow do
      name = edit_line :width => 150
      button "Search" do
        ds = SomeDataProcessing.openOn("PPIDdata.txt")
        ds.showData(name.text)
      end
      button "List" do
        dl = SomeDataProcessing.openOn("PPIDdata.txt")
        dl.listData
      end
    end
  end
end

PPIDdata.txt

test,test,test,test-test-test,test,test
testaa,dd,ee,5-5-5,ff,ss