added ru plural proc

lib/locales/plurals.rb

@@ -3,21 +3,33 @@
 # frozen_string_literal: true
 
 # utility variables
-zero_one = ['zero', 'one']
+zero_one   = ['zero', 'one']
+from2to4   = (2..4)
+from5to9   = (5..9)
+from11to14 = (11..14)
+from12to14 = (12..14)
 
 # Plurals
 # A plural proc returns a plural type string based on the passed count
 # Each plural proc may apply to one or more languages below
 plurals = {
-  zero_one_other: -> (count) {zero_one[count] || 'other'}
+  zero_one_other:     -> (count) {zero_one[count] || 'other'},
+  one_few_many_other: -> (count) do
+    mod10, mod100 = count % 10, count % 100
+    if    mod10 == 1 && mod100 != 11                                        ; 'one'
+    elsif from2to4.cover?(mod10) && !from12to14.cover?(mod100)              ; 'few'
+    elsif mod10 == 0 || from5to9.cover?(mod10) || from11to14.cover?(mod100) ; 'many'
+    else                                                                      'other'
+    end
+  end
 }
 
 # Languages (language/plural pairs)
 # Contain all the entries for all the languages defined in the pagy.yml dictionary
 # The default plural for missing languages is the :zero_one_other plural (used for English)
 Hash.new(plurals[:zero_one_other]).tap do |languages|
   languages['en'] = plurals[:zero_one_other]
-
-  # PR for other languages and plurals are very welcome. Thanks!
-
+  languages['ru'] = plurals[:one_few_many_other]
 end
+
+# PR for other languages and plurals are very welcome. Thanks!