Google Translator: Handles line breaks

- Line breaks are not kept when translating html content via Google Translate
- Therefore we transform `\n` into a placeholder and then back after
  translating
- Fixes #566

lib/i18n/tasks/translators/google_translator.rb

@@ -4,6 +4,7 @@
 
 module I18n::Tasks::Translators
   class GoogleTranslator < BaseTranslator
+    NEWLINE_PLACEHOLDER = '<br id=i18n />'
     def initialize(*)
       begin
         require 'easy_translate'
@@ -16,7 +17,15 @@ def initialize(*)
     protected
 
     def translate_values(list, **options)
-      EasyTranslate.translate(list, options)
+      restore_newlines(
+        EasyTranslate.translate(
+          replace_newlines_with_placeholder(list, options[:html]),
+          options,
+          format: :text
+        ),
+        options[:html]
+      )
+
     end
 
     def options_for_translate_values(from:, to:, **options)
@@ -56,5 +65,21 @@ def api_key
         key
       end
     end
+
+    def replace_newlines_with_placeholder(list, html)
+      return list unless html
+
+      list.map do |value|
+        value.gsub("\n", NEWLINE_PLACEHOLDER)
+      end
+    end
+
+    def restore_newlines(translations, html)
+      return translations unless html
+
+      translations.map do |translation|
+        translation.gsub("#{NEWLINE_PLACEHOLDER} ", "\n")
+      end
+    end
   end
 end

spec/google_translate_spec.rb

@@ -4,14 +4,16 @@
 require 'i18n/tasks/commands'
 
 RSpec.describe 'Google Translation' do
-  nil_value_test = ['nil-value-key', nil, nil]
-  empty_value_test = ['empty-value-key', '', '']
-  text_test      = ['key', "Hello, %{user} O'Neill!", "¡Hola, %{user} O'Neill!"]
-  html_test      = ['html-key.html', "Hello, <b>%{user} O'neill</b>", "Hola, <b>%{user} O'neill</b>"]
-  html_test_plrl = ['html-key.html.one', '<b>Hello %{count}</b>', '<b>Hola %{count}</b>']
-  array_test     = ['array-key', ['Hello.', nil, '', 'Goodbye.'], ['Hola.', nil, '', 'Adiós.']]
-  fixnum_test    = ['numeric-key', 1, 1]
-  ref_key_test   = ['ref-key', :reference, :reference]
+  nil_value_test      = ['nil-value-key', nil, nil]
+  empty_value_test    = ['empty-value-key', '', '']
+  text_test           = ['hello', "Hello, %{user} O'Neill!", "¡Hola, %{user} O'Neill!"]
+  text_test_multiline = ['hello_multiline', "Hello,\n%{user}\nO'Neill!", "Hola,\n%{user}\n¡O'Neill!"]
+  html_test           = ['html-key.html', "Hello, <b>%{user} O'neill</b>", "Hola, <b>%{user} O'neill</b>"]
+  html_test_plrl      = ['html-key.html.one', '<b>Hello %{count}</b>', '<b>Hola %{count}</b>']
+  html_test_multiline = ['html-key.html.multiline', "<b>Hello</b>\n<b>%{user}</b>", "<b>Hola</b>\n<b>%{user}</b>"]
+  array_test          = ['array-key', ['Hello.', nil, '', 'Goodbye.'], ['Hola.', nil, '', 'Adiós.']]
+  fixnum_test          = ['numeric-key', 1, 1]
+  ref_key_test        = ['ref-key', :reference, :reference]
 
   describe 'real world test' do
     delegate :i18n_task, :in_test_app_dir, :run_cmd, to: :TestCodebase
@@ -36,10 +38,12 @@
                                         'common' => {
                                           'a' => 'λ',
                                           'hello' => text_test[1],
+                                          'hello_multiline' => text_test_multiline[1],
                                           'hello_html' => html_test[1],
                                           'hello_plural_html' => {
                                             'one' => html_test_plrl[1]
                                           },
+                                          'hello_multiline_html' => html_test_multiline[1],
                                           'array_key' => array_test[1],
                                           'nil-value-key' => nil_value_test[1],
                                           'empty-value-key' => empty_value_test[1],
@@ -55,8 +59,10 @@
 
           run_cmd 'translate-missing'
           expect(task.t('common.hello', 'es')).to eq(text_test[2])
+          expect(task.t('common.hello_multiline', 'es')).to eq(text_test_multiline[2])
           expect(task.t('common.hello_html', 'es')).to eq(html_test[2])
           expect(task.t('common.hello_plural_html.one', 'es')).to eq(html_test_plrl[2])
+          expect(task.t('common.hello_multiline_html', 'es')).to eq(html_test_multiline[2])
           expect(task.t('common.array_key', 'es')).to eq(array_test[2])
           expect(task.t('common.nil-value-key', 'es')).to eq(nil_value_test[2])
           expect(task.t('common.empty-value-key', 'es')).to eq(empty_value_test[2])