Franslate, the sinatra part

franslate.rb

require 'sinatra'
require 'json'
require 'mustache'

## INITIALIZATION ##########################

configure do
    LANGS_AVAILABLE = {
        'de' => 'languages/de_20k_trans.txt',
        'fr' => 'languages/fr_20k_trans.txt',
        'pl' => 'languages/pl_20k_trans.txt',
        'ru' => 'languages/ru_20k_trans.txt'
    }

    LEVELS_AVAILABLE = {
        'beginner' => 100,
        'intermediate' => 1000,
        'advanced' => 10000
    }

    @@langs = {}

    LANGS_AVAILABLE.each { |lang, filename|
        @@langs[lang] = {}
        LEVELS_AVAILABLE.each { |diff, num|
            @@langs[lang][diff] = {}
        }

        i = 0
        puts 'Loading ' + filename
        File.open(filename) { |f|
            f.each { |line|
                tr, en = line.split(' ', 2)

                if tr.strip.casecmp(en.strip) == 0
                    next
                end

                if i < 100
                    @@langs[lang]['beginner'][tr] = en;
                end

                if i < 1000
                    @@langs[lang]['intermediate'][tr] = en;
                end

                @@langs[lang]['advanced'][tr] = en;

                i += 1
                if i > 10000
                    break
                end
            }
        }
    }

end

## HELPERS ##############################################

def get_question(lang, difficulty)
    src_wordset = @@langs[lang][difficulty]
    french_word = src_wordset.keys().sample
    correct_option = src_wordset[french_word]

    {
        'language' => lang,
        'word' => french_word,
        'correct_option' => correct_option,
        'options' => (src_wordset.values().sample(4) + [correct_option]).shuffle.map{|i| {'name' => i}}
    }.to_json

end

def render_template(tmpl_name)
    Dir::chdir('templates'){ |d|
        File.open(tmpl_name + '.mustache'){|f|
            Mustache.render(f.read)
        }
    }
end

## VIEWS ##################################

get '/' do
    render_template('index')
end

get '/about/' do
    render_template('about')
end

get '/:lang/:difficulty/' do |lang, diff|
    content_type :json
    get_question(lang, diff)
end