ruby.rb

#!/usr/bin/env ruby

require 'tk'

root = TkRoot.new do
    icon = TkPhotoImage.new('file' => 'icon.png')
    iconphoto(icon)
    title 'Example'
    resizable 0, 0
end

label_of_telephone_or_email = TkLabel.new(root) do
    text 'Telephone or email:'
    pack
end

entry_of_telephone_or_email = TkEntry.new(root) do
    pack
end

label_of_password = TkLabel.new(root) do
    text 'Password'
    pack
end

entry_of_password = TkEntry.new(root) do
    show '*'
    pack
end

button_of_login = TkButton.new(root) do
    text 'Log in'
    command { login }
    pack
end

def login
    telephone_or_email = entry_of_telephone_or_email.get
    password = entry_of_password.get
end

Tk.mainloop