init project

lib/educoder/i18n.rb

@@ -0,0 +1,167 @@
+module Educoder
+  module I18n
+    def self.included(base)
+      base.extend Educoder::I18n
+    end
+
+    def l(*args)
+      case args.size
+        when 1
+          ::I18n.t(*args)
+        when 2
+          if args.last.is_a?(Hash)
+            ::I18n.t(*args)
+          elsif args.last.is_a?(String)
+            ::I18n.t(args.first, :value => args.last)
+          else
+            ::I18n.t(args.first, :count => args.last)
+          end
+        else
+          raise "Translation string with multiple values: #{args.first}"
+      end
+    end
+
+    def l_or_humanize(s, options={})
+      k = "#{options[:prefix]}#{s}".to_sym
+      ::I18n.t(k, :default => s.to_s.humanize)
+    end
+
+    def l_hours(hours)
+      hours = hours.to_f
+      l((hours < 2.0 ? :label_f_hour : :label_f_hour_plural), :value => ("%.2f" % hours.to_f))
+    end
+
+    def ll(lang, str, value=nil)
+      ::I18n.t(str.to_s, :value => value, :locale => lang.to_s.gsub(%r{(.+)\-(.+)$}) { "#{$1}-#{$2.upcase}" })
+    end
+
+    def format_date(date)
+      return nil unless date
+      options = {}
+      options[:format] = Setting.date_format unless Setting.date_format.blank?
+      options[:locale] = User.current.language unless User.current.language.blank?
+      ::I18n.l(date.to_date, options)
+    end
+
+    def format_time(time, include_date = true)
+      return nil unless time
+      options = {}
+      options[:format] = (Setting.time_format.blank? ? :time : Setting.time_format)
+      options[:locale] = User.current.language unless User.current.language.blank?
+      time = time.to_time if time.is_a?(String)
+      zone = User.current.time_zone
+      local = zone ? time.in_time_zone(zone) : (time.utc? ? time.localtime : time)
+      (include_date ? "#{format_date(local)} " : "") + ::I18n.l(local, options)
+    end
+
+    def day_name(day)
+      ::I18n.t('date.day_names')[day % 7]
+    end
+
+    def day_letter(day)
+      ::I18n.t('date.abbr_day_names')[day % 7].first
+    end
+
+    def month_name(month)
+      ::I18n.t('date.month_names')[month]
+    end
+
+    def valid_languages
+      ::I18n.available_locales
+    end
+
+    # Returns an array of languages names and code sorted by names, example:
+    # [["Deutsch", "de"], ["English", "en"] ...]
+    #
+    # The result is cached to prevent from loading all translations files.
+    def languages_options
+      ActionController::Base.cache_store.fetch "i18n/languages_options" do
+        valid_languages.map {|lang| [ll(lang.to_s, :general_lang_name), lang.to_s]}.sort {|x,y| x.first <=> y.first }
+      end
+    end
+
+    def find_language(lang)
+      @@languages_lookup = valid_languages.inject({}) {|k, v| k[v.to_s.downcase] = v; k }
+      @@languages_lookup[lang.to_s.downcase]
+    end
+
+    def set_language_if_valid(lang)
+      if l = find_language(lang)
+        ::I18n.locale = l
+      end
+    end
+
+    def current_language
+      ::I18n.locale
+    end
+
+    # Custom backend based on I18n::Backend::Simple with the following changes:
+    # * lazy loading of translation files
+    # * available_locales are determined by looking at translation file names
+    class Backend
+      (class << self; self; end).class_eval { public :include }
+
+      module Implementation
+        include ::I18n::Backend::Base
+
+        # Stores translations for the given locale in memory.
+        # This uses a deep merge for the translations hash, so existing
+        # translations will be overwritten by new ones only at the deepest
+        # level of the hash.
+        def store_translations(locale, data, options = {})
+          locale = locale.to_sym
+          translations[locale] ||= {}
+          data = data.deep_symbolize_keys
+          translations[locale].deep_merge!(data)
+        end
+
+        # Get available locales from the translations filenames
+        def available_locales
+          @available_locales ||= ::I18n.load_path.map {|path| File.basename(path, '.*')}.uniq.sort.map(&:to_sym)
+        end
+
+        # Clean up translations
+        def reload!
+          @translations = nil
+          @available_locales = nil
+          super
+        end
+
+        protected
+
+        def init_translations(locale)
+          locale = locale.to_s
+          paths = ::I18n.load_path.select {|path| File.basename(path, '.*') == locale}
+          load_translations(paths)
+          translations[locale] ||= {}
+        end
+
+        def translations
+          @translations ||= {}
+        end
+
+        # Looks up a translation from the translations hash. Returns nil if
+        # eiher key is nil, or locale, scope or key do not exist as a key in the
+        # nested translations hash. Splits keys or scopes containing dots
+        # into multiple keys, i.e. <tt>currency.format</tt> is regarded the same as
+        # <tt>%w(currency format)</tt>.
+        def lookup(locale, key, scope = [], options = {})
+          init_translations(locale) unless translations.key?(locale)
+          keys = ::I18n.normalize_keys(locale, key, scope, options[:separator])
+
+          keys.inject(translations) do |result, _key|
+            _key = _key.to_sym
+            return nil unless result.is_a?(Hash) && result.has_key?(_key)
+            result = result[_key]
+            result = resolve(locale, _key, result, options.merge(:scope => nil)) if result.is_a?(Symbol)
+            result
+          end
+        end
+      end
+
+      include Implementation
+      # Adds fallback to default locale for untranslated strings
+      include ::I18n::Backend::Fallbacks
+    end
+  end
+end