rename repeating -> recurring, repeat -> recurrence

app/models/recurring_todos/weekly_recurrence_pattern.rb

@@ -0,0 +1,86 @@
+module RecurringTodos
+
+  class WeeklyRecurrencePattern < AbstractRecurrencePattern
+
+    def initialize(user)
+      super user
+    end
+
+    def every_x_week
+      get :every_other1
+    end
+
+    { monday: 1, tuesday: 2, wednesday: 3, thursday: 4, friday: 5, saturday: 6, sunday: 0 }.each do |day, number|
+      define_method("on_#{day}") do
+        on_xday number
+      end
+    end
+
+    def on_xday(n)
+      get(:every_day) && get(:every_day)[n, 1] != ' '
+    end
+
+    def recurrence_pattern
+      if every_x_week > 1
+        I18n.t("todos.recurrence.pattern.every_n", :n => every_x_week) + " " + I18n.t("common.weeks")
+      else
+        I18n.t('todos.recurrence.pattern.weekly')
+      end
+    end
+
+    def validate
+      super
+      validate_not_blank(every_x_week, "Every other nth week may not be empty for weekly recurrence setting")
+      something_set = %w{sunday monday tuesday wednesday thursday friday saturday}.inject(false) { |set, day| set || self.send("on_#{day}") }
+      errors[:base] << "You must specify at least one day on which the todo recurs" unless something_set
+    end
+
+    def get_next_date(previous)
+      start = determine_start_date(previous)
+
+      day = find_first_day_in_this_week(start)
+      return day unless day == -1
+
+      # we did not find anything this week, so check the nth next, starting from
+      # sunday
+      start = start + self.every_x_week.week - (start.wday()).days
+
+      start = find_first_day_in_this_week(start)
+      return start unless start == -1
+
+      raise Exception.new, "unable to find next weekly date (#{self.every_day})"
+    end
+
+    private
+
+    def determine_start_date(previous)
+      if previous.nil?
+        return self.start_from || Time.zone.now
+      else
+        start = previous + 1.day
+        if start.wday() == 0
+          # we went to a new week, go to the nth next week and find first match
+          # that week. Note that we already went into the next week, so -1
+          start += (every_x_week-1).week
+        end
+        unless self.start_from.nil?
+          # check if the start_from date is later than previous. If so, use
+          # start_from as start to search for next date
+          start = self.start_from if self.start_from > previous
+        end
+        return start
+      end
+    end
+
+    def find_first_day_in_this_week(start)
+      # check if there are any days left this week for the next todo
+      start.wday().upto 6 do |i|
+        return start + (i-start.wday()).days if on_xday(i)
+      end
+      -1
+    end
+
+
+  end
+
+end