Check newlines in translations

lib/gitlab/po_linter.rb

@@ -61,6 +61,10 @@ module Gitlab
       if entry[:msgid].is_a?(Array)
         errors << "<#{message_id}> is defined over multiple lines, this breaks some tooling."
       end
+
+      if translations_in_entry(entry).any? { |translation| translation.is_a?(Array) }
+        errors << "<#{message_id}> has translations defined over multiple lines, this breaks some tooling."
+      end
     end
 
     def validate_variables(errors, entry)
@@ -172,5 +176,17 @@ module Gitlab
     def join_message(message)
       Array(message).join
     end
+
+    def translations_in_entry(entry)
+      if entry[:msgid_plural].present?
+        entry.fetch_values(*plural_translation_keys_in_entry(entry))
+      else
+        [entry[:msgstr]]
+      end
+    end
+
+    def plural_translation_keys_in_entry(entry)
+      entry.keys.select { |key| key =~ /msgstr\[\d*\]/ }
+    end
   end
 end

spec/fixtures/newlines.po

@@ -30,3 +30,12 @@ msgstr ""
 "Va a eliminar %{group_name}.\n"
 "¡El grupo eliminado NO puede ser restaurado!\n"
 "¿Estás TOTALMENTE seguro?"
+
+msgid "With plural"
+msgid_plural "with plurals"
+msgstr[0] "first"
+msgstr[1] "second"
+msgstr[2] ""
+"with"
+"multiple"
+"lines"

spec/lib/gitlab/po_linter_spec.rb

@@ -26,11 +26,25 @@ describe Gitlab::PoLinter do
     context 'for a translations with newlines' do
       let(:po_path) { 'spec/fixtures/newlines.po' }
 
-      it 'has an error' do
+      it 'has an error for a normal string' do
         message_id = "You are going to remove %{group_name}.\\nRemoved groups CANNOT be restored!\\nAre you ABSOLUTELY sure?"
         expected_message = "<#{message_id}> is defined over multiple lines, this breaks some tooling."
 
-        is_expected.to include(message_id => [expected_message])
+        expect(errors[message_id]).to include(expected_message)
+      end
+
+      it 'has an error when a translation is defined over multiple lines' do
+        message_id = "You are going to remove %{group_name}.\\nRemoved groups CANNOT be restored!\\nAre you ABSOLUTELY sure?"
+        expected_message = "<#{message_id}> has translations defined over multiple lines, this breaks some tooling."
+
+        expect(errors[message_id]).to include(expected_message)
+      end
+
+      it 'raises an error when a plural translation is defined over multiple lines' do
+        message_id = 'With plural'
+        expected_message = "<#{message_id}> has translations defined over multiple lines, this breaks some tooling."
+
+        expect(errors[message_id]).to include(expected_message)
       end
     end