Add copy command

Closes: #288

config/locales/en.yml

@@ -37,6 +37,7 @@ en:
         check_consistent_interpolations: verify that all translations use correct interpolation variables
         check_normalized: verify that all translation data is normalized
         config: display i18n-tasks configuration
+        cp: copy the keys in locale data that match the given pattern
         data: show locale data
         data_merge: merge locale data with trees
         data_remove: remove keys present in tree from data

config/locales/ru.yml

@@ -35,6 +35,7 @@ ru:
           интерполяционные переменные
         check_normalized: проверить, что все файлы переводов нормализованы
         config: показать конфигурацию
+        cp: скопируйте ключи в данных локали, соответствующие заданному шаблону
         data: показать данные переводов
         data_merge: добавить дерево к переводам
         data_remove: удалить ключи, которые есть в дереве, из данных

lib/i18n/tasks/command/commands/data.rb

@@ -46,6 +46,20 @@ def mv(opt = {})
           terminal_report.mv_results results
         end
 
+        cmd :cp,
+            pos: 'FROM_KEY_PATTERN TO_KEY_PATTERN',
+            desc: t('i18n_tasks.cmd.desc.cp')
+        def cp(opt = {})
+          fail CommandError, 'requires FROM_KEY_PATTERN and TO_KEY_PATTERN' if opt[:arguments].size < 2
+
+          from_pattern = opt[:arguments].shift
+          to_pattern = opt[:arguments].shift
+          forest = i18n.data_forest
+          results = forest.mv_key!(compile_key_pattern(from_pattern), to_pattern, root: false, retain: true)
+          i18n.data.write forest
+          terminal_report.cp_results results
+        end
+
         cmd :rm,
             pos: 'KEY_PATTERN [KEY_PATTERN...]',
             desc: t('i18n_tasks.cmd.desc.rm')

lib/i18n/tasks/data/tree/siblings.rb

@@ -36,7 +36,7 @@ def rename_key(key, new_key)
     # @param to_pattern [Regexp]
     # @param root [Boolean]
     # @return {old key => new key}
-    def mv_key!(from_pattern, to_pattern, root: false) # rubocop:disable Metrics/AbcSize,Metrics/MethodLength
+    def mv_key!(from_pattern, to_pattern, root: false, retain: false) # rubocop:disable Metrics/AbcSize,Metrics/MethodLength
       moved_forest = Siblings.new
       moved_nodes = []
       old_key_to_new_key = {}
@@ -69,7 +69,7 @@ def mv_key!(from_pattern, to_pattern, root: false) # rubocop:disable Metrics/Abc
           node.value = new_target.to_sym
         end
       end
-      remove_nodes_and_emptied_ancestors! moved_nodes
+      remove_nodes_and_emptied_ancestors!(moved_nodes) unless retain
       merge! moved_forest
       old_key_to_new_key
     end

lib/i18n/tasks/reports/terminal.rb

@@ -93,6 +93,12 @@ def mv_results(results)
           end
         end
 
+        def cp_results(results)
+          results.each do |(from, to)|
+            print_info "#{Rainbow(from).cyan} #{Rainbow('+').yellow.bright} #{Rainbow(to).green}"
+          end
+        end
+
         def check_normalized_results(non_normalized)
           if non_normalized.empty?
             print_success 'All data is normalized'

spec/commands/data_commands_spec.rb

@@ -44,4 +44,10 @@ def en_data2
     expect(in_test_app_dir { YAML.load_file('config/locales/en.yml') })
       .to(eq('en' => { 'b' => '1', 'common' => { 'hello' => 'Hello' } }))
   end
+
+  it '#cp' do
+    run_cmd('cp', 'a', 'b')
+    expect(in_test_app_dir { YAML.load_file('config/locales/en.yml') })
+      .to(eq('en' => { 'a' => '1', 'b' => '1', 'common' => { 'hello' => 'Hello' } }))
+  end
 end