This is probably my first real Ruby code ever - it prints specified number of busines cards on a page, using PostScript, RTF or TeX and was an assignment for my university classes. Date on forgotten Dropbox account is March 2009, but I'm pretty sure it's from autumn 2007.

printer.rb

class Vcard
  attr_reader :imie, :nazwisko, :firma, :telefon
  def show
    if not @imie
      puts "Dane niezaładowane"
    else
      puts @imie + " " + @nazwisko
      puts @firma
      puts @telefon
    end
  end
  def new_data
    print "Podaj imię: "
    @imie = gets.chomp
    print "Podaj nazwisko: "
    @nazwisko = gets.chomp
    print "Podaj nazwę firmy: "
    @firma = gets.chomp
    print "Podaj telefon: "
    @telefon = gets.chomp
  end
  def edit_data
    puts "Wciśnij ENTER, by pozostawić obecną wartość lub wpisz nową."
    print "Imię (" + @imie + "): "
    tmp = gets.chomp
    @imie = tmp if not tmp == ""
    print "Nazwisko (" + @nazwisko + "): "
    tmp = gets.chomp
    @nazwisko = tmp if not tmp == ""
    print "Firma (" + @firma + "): "
    tmp = gets.chomp
    @firma = tmp if not tmp == ""
    print "Telefon (" + @firma + "): "
    tmp = gets.chomp
    @telefon = tmp if not tmp == ""
  end
end
 
class Printer
  attr_reader :queue, :total_quant
  def initialize
    @total_quant = 0
    @queue = Array.new
  end
  def add(vc,quant)
    @queue << [vc,quant]
    @total_quant += quant
  end
  def undo # cofa ostatnie dodanie do kolejki drukowania
    @queue.pop
  end
  def set(type,filename)
    @type = type
    @fname = filename
  end
  def print
    self.print_ps if @type == "ps"
    self.print_rtf if @type == "rtf"
    self.print_tex if @type == "tex"
  end
   
  def print_ps
    out = File.open(@fname,"w")
    out.puts "%!PS-Adobe-3.0 EPSF-30.
%%BoundingBox:0 0 595.28 841.89
 
/mm {2.8346 mul} bind def
 
.6 setgray
5 setlinewidth"
    @actual_height = 240
    even = @total_quant/2
    even.times do
      out.puts "10 mm " + @actual_height.to_s + " mm moveto
90 mm 0 rlineto
0 50 mm rlineto
-90 mm 0 rlineto
closepath
 
110 mm " + @actual_height.to_s + " mm moveto
90 mm 0 rlineto
0 50 mm rlineto
-90 mm 0 rlineto
closepath"
      @actual_height -= 55
    end
    out.puts "10 mm " + @actual_height.to_s + " mm moveto
90 mm 0 rlineto
0 50 mm rlineto
-90 mm 0 rlineto
closepath" if @total_quant % 2 == 1
    out.puts "stroke
0 setgray"
    @actual_height = 270
    @actual_width = 55
    @queue.each do |vcard|
      vcard[1].times do
        out.puts "/Verdana findfont
20 scalefont
setfont
" + @actual_width.to_s + " mm " + @actual_height.to_s + " mm moveto
(" + vcard[0].imie + " " + vcard[0].nazwisko + ") dup stringwidth pop 2 div neg 0 rmoveto show
 
/Times-Bold findfont
15 scalefont
setfont
newpath
" + (@actual_width-10).to_s + " mm " + (@actual_height-8).to_s + " mm moveto
(" + vcard[0].firma + ") show
/Times-Roman findfont
15 scalefont
setfont
newpath
" + (@actual_width-10).to_s + " mm " + (@actual_height-14).to_s + " mm moveto
(Tel. " + vcard[0].telefon + ") show"
        if @actual_width == 55
          @actual_width = 155
        else
          @actual_width = 55
          @actual_height -= 55
        end
      end
    end
    out.puts "showpage
%%EOF"
    puts "Zapisano plik " + @fname
    fork { exec "evince " + @fname }
    out.close
  end
   
  def print_rtf
    out = File.open(@fname,"w")
    out.puts "{\\rtf1\\ansi\\ansicpg1250\\deff0
{\\fonttbl
{\\f0\\roman Verdana;}
{\\f1\\roman Times;}
}
{\\colortbl
\\red0\\green0\\blue0;
\\red0\\green0\\blue255;
}"
    even = @total_quant/2
    table = Array.new
    @queue.each do |vcard|
      vcard[1].times {table << vcard[0]}
    end
    @num = 0
    even.times do
      out.puts "\\trowd\\trrh2500
\\clbrdrt\\brdrw35\\brdrs\\brdrcf2
\\clbrdrl\\brdrw35\\brdrs\\brdrcf2
\\clbrdrb\\brdrw35\\brdrs\\brdrcf2
\\clbrdrr\\brdrw35\\brdrs\\brdrcf2
\\clvertalc
\\cellx4700
\\cellx4900
\\clbrdrt\\brdrw35\\brdrs\\brdrcf2
\\clbrdrl\\brdrw35\\brdrs\\brdrcf2
\\clbrdrb\\brdrw35\\brdrs\\brdrcf2
\\clbrdrr\\brdrw35\\brdrs\\brdrcf2
\\clvertalc
\\cellx9600
\\pard\\intbl\\qc
\\fs40\\f0\\cf0\\b " + table[@num].imie + " " + table[@num].nazwisko + "\\b0\\line
\\fs30\\f1\\cf1 " + table[@num].firma + "\\cf0\\line
Tel. " + table[@num].telefon + "
\\line
\\cell
\\cell
\\pard\\intbl\\qc
\\fs40\\f0\\cf0\\b " + table[@num+1].imie + " " + table[@num+1].nazwisko + "\\b0\\line
\\fs30\\f1\\cf1 " + table[@num+1].firma + "\\cf0\\line
Tel. " + table[@num+1].telefon + "
\\line
\\cell
\\row
\\trowd\\trrh30
\\cellx9600
  
\\cell
\\row"
      @num += 2
    end
    out.puts "\\trowd\\trrh2500
\\clbrdrt\\brdrw35\\brdrs\\brdrcf2
\\clbrdrl\\brdrw35\\brdrs\\brdrcf2
\\clbrdrb\\brdrw35\\brdrs\\brdrcf2
\\clbrdrr\\brdrw35\\brdrs\\brdrcf2
\\clvertalc
\\cellx4700
\\pard\\intbl\\qc
\\fs40\\f0\\cf0\\b " + table[@num].imie + " " + table[@num].nazwisko + "\\b0\\line
\\fs30\\f1\\cf1 " + table[@num].firma + "\\cf0\\line
Tel. " + table[@num].telefon + "
\\line
\\cell
\\row" if @total_quant % 2 == 1
    out.puts "}"
    puts "Zapisano plik " + @fname
    out.close
    fork {exec "soffice " + @fname}
  end
  def print_tex
    out = File.open(@fname,"w")
    out.puts "%& --translate-file=il2-pl
\\documentclass[a4paper,10pt]{mwart}
\\usepackage{polski}
\\begin{document}
\\begin{tabular}{|p{6cm}|p{6cm}|}\\hline"
    even = @total_quant/2
    table = Array.new
    @queue.each do |vcard|
      vcard[1].times {table << vcard[0]}
    end
    @num = 0
    even.times do
      out.puts "\\begin{center}
       
\\textbf{ \\\\ " + table[@num].imie + " " + table[@num].nazwisko + "}\\\\
\\textsl{" + table[@num].firma + "}\\\\
Tel. " + table[@num].telefon + "\\\\
\\end{center}
& \\begin{center} 
 
\\textbf{" + table[@num+1].imie + " " + table[@num+1].nazwisko + "}\\\\
\\textsl{" + table[@num+1].firma + "}\\\\
Tel. " + table[@num+1].telefon + "
 
  
\\end{center}\\\\
\\hline"
    @num += 2
    end
    out.puts "\\begin{center}
     
\\textbf{ \\\\ " + table[@num].imie + " " + table[@num].nazwisko + "}\\\\
\\textsl{" + table[@num].firma + "}\\\\
Tel. " + table[@num].telefon + "\\\\
\\end{center}
& \\\\
\\hline" if @total_quant%2 == 1
    out.puts "\\end{tabular}
\\end{document}"
    puts "Zapisano plik " + @fname
    out.close
    fork {exec "latex " + @fname + " && evince " + @fname.gsub(/\..+/,"") + ".dvi"}
  end
end
 
class Interface
  def initialize
    @printer = Printer.new
    @vcards = Array.new
  end
  def load_lang(lang)
    lfile = File.open(lang + ".lng","r")
    @main_menu = lfile.gets
    @print_menu = lfile.gets
    @lang_menu = lfile.gets
    @obj_menu = lfile.gets
    @give_fname = lfile.gets
    @wrong_option = lfile.gets
  end
  def main_menu
    puts "\n\nMenu główne:"
    puts "1. Kolejka drukowania"
    puts "2. Wizytówki"
    puts "0. Wyjdź"
    answer = gets.chomp
    return false if answer == "0"
    self.menu_printing if answer == "1"
    self.menu_vcards if answer == "2"
    return true
  end
  def menu_printing
    loop do
      puts "\n\nKolejka drukowania:"
      if @printer.total_quant == 0
        puts "Kolejka jest aktualnie pusta!"
      else
        @printer.queue.each do |item|
          puts item[0].imie + " " + item[0].nazwisko + ": " + item[1].to_s + " razy"
        end
        puts "Razem " + @printer.total_quant.to_s + " wizytówek na stronie"
      end
      puts "\n1. Dodaj wizytówkę do kolejki"
      puts "2. Usuń ostatnią wizytówkę z kolejki"
      puts "3. Drukuj"
      puts "0: Wyjdź do menu głównego"
      answer = gets.chomp
      break if answer == "0"
      if answer == "1"
        if @printer.total_quant == 10
          puts "Nie możesz dodać więcej wizytówek, najpierw trzeba coś usunąć"
        else
          self.list_vcards
          print "Podaj numer wizytówki, którą chcesz dodać: "
          num = gets.chomp
          if num.to_i != 0
            if @vcards[num.to_i-1]
              max = 10 - @printer.total_quant
              print "Ile wizytówek wydrukować? (max. " + max.to_s + "): "
              quant = gets.chomp
              if not quant == "0"
                quant = quant.to_i
                if quant != 0
                  if quant > max
                    puts "Za dużo..."
                    quant = max
                  end
                  puts "Dodaję " + quant.to_s + " wizytówek"
                  @printer.add(@vcards[num.to_i-1],quant)                
                else
                  puts "Błędna wartość."
                end
              end
            else
              puts "Nie ma wizytówki o tym numerze."
            end
          else
            puts "Nieprawidłowa wartość."
          end
        end
      end
      @printer.undo if answer == "2"
      self.print_menu if answer == "3"
    end
  end
  def print_menu
    puts "Wybierz format:"
    puts "1. PostScript"
    puts "2. Rich Text File (RTF)"
    puts "3. LaTeX"
    puts "inne: Wyjdź do menu głównego"
    answer = gets.chomp
    case answer
      when "1": type = "ps"
      when "2": type = "rtf"
      when "3": type = "tex"
      else return false
    end
    print "Podaj nazwę pliku docelowego (z rozszerzeniem): "
    fname = gets.chomp
    if File.exists?(fname)
      print "Plik o tej nazwie istnieje. Nadpisać? (T/N) "
      answer = gets.chomp
      if not answer == "T"
        puts "Nie zapisuję więc niczego..."
        return false
      end
    end
    @printer.set(type,fname)
    puts "Drukowanie rozpoczęte."
    @printer.print
  end
  def menu_vcards
    loop do
      puts "\n\nWizytówki:"
      puts "1. Obejrzyj wizytówki"
      puts "2. Edytuj wizytówkę"
      puts "3. Dodaj wizytówkę"
      puts "4. Usuń ostatnią wizytówkę"
      puts "0. Wróć do menu głównego"
      answer = gets.chomp
      break if answer == "0"
      if answer == "1"
        if @vcards.empty?
          puts "Nie ma czego oglądać - lista jest pusta"
        else
          @vcards.each do |vcard|
            vcard.show
            puts "" # oddzielenie
          end
        end
      end
      if answer == "2"
        self.list_vcards
        print "Którą z nich chcesz edytować? "
        num = gets.chomp
        if num.to_i != 0
          if @vcards[num.to_i-1]
            @vcards[num.to_i-1].edit_data         
          else
            puts "Nie ma wizytówki o tym numerze."
          end
        else
          puts "Nieprawidłowa wartość."
        end
      end
      if answer == "3"
        @vcards << Vcard.new
        @vcards.last.new_data
      end
      if answer == "4"
        puts "Czy na pewno chcesz usunąć wizytówkę:"
        @vcards.last.show
        print "(T/N) "
        num = gets.chomp # bo po co definiować dodatkowe zmienne? ;)
        if num == "T"
          @vcards.pop
        else
          puts "Nie to nie..."
        end
      end
    end
  end
  def list_vcards
    @num = 1
    if @vcards.empty?
      puts "Brak wizytówek."
    else
      @vcards.each do |vcard|
        puts @num.to_s + ". " + vcard.imie + " " + vcard.nazwisko
        @num += 1
      end
    end
  end
end
 
iface = Interface.new
while iface.main_menu
end