henrik · June 26, 2012 07:30 · Jun 26, 2012 · Jun 26, 2012 · Jun 26, 2012
diff --git a/README.markdown b/README.markdown
@@ -0,0 +1,3 @@
+This is how we test that all translation keys match up between locales.
+
+Stuff that only goes in one locale (such as an admin section) or that can't be translated yet (if you use external translators) can simply go in files that don't match the path "config/locales/??.yml", like "config/locales/wip.fo.yml".
diff --git a/support-i18n_helpers.rb b/support-i18n_helpers.rb
@@ -0,0 +1,69 @@
+require 'yaml'
+
+module I18nHelpers
+  PLURALIZATION_KEYS = %w[
+    zero
+    one
+    two
+    few
+    many
+    other
+  ]
+
+  def load_locales
+    base_i18n_files.each do |file|
+      locale = File.basename(file, ".*")
+      hash = YAML.load_file(file)[locale]
+      locales_to_keys[locale] = get_flat_keys(hash)
+    end
+  end
+
+  def base_i18n_files
+    Dir["config/locales/*.yml"].select { |x| File.basename(x).match(/\A\w\w.yml\Z/) }
+  end
+
+  def locales_to_keys
+    @locales_to_keys ||= {}
+  end
+
+  def locales_to_documents
+    @locales_to_documents = locales_to_keys.keys.inject({}) do |hash, locale|
+      # E.g. [ "terms" ]
+      documents = Dir["config/locales/documents/*.#{locale}.*"].map { |file| File.basename(file, ".#{locale}.markdown") }
+      hash.merge locale => documents
+    end
+  end
+
+  def unique_keys
+    locales_to_keys.values.flatten.uniq.sort
+  end
+
+  def unique_documents
+    locales_to_documents.values.flatten.uniq.sort
+  end
+
+  def get_flat_keys(hash, path = [])
+    hash.map do |k, v|
+
+      new_path = path + [ k ]
+
+      # Ignore any pluralization differences.
+      if v.is_a?(Hash) && looks_like_plural?(v)
+        v = "Pretend it's a leaf."
+      end
+
+      case v
+      when Hash
+        get_flat_keys(v, new_path)
+      when String
+        new_path.join(".")
+      else
+        raise "wtf? #{ v }"
+      end
+    end.flatten
+  end
+
+  def looks_like_plural?(hash)
+    hash.keys.length > 1 && hash.keys.all? { |k| PLURALIZATION_KEYS.include?(k) }
+  end
+end
diff --git a/unit-i18n_spec.rb b/unit-i18n_spec.rb
@@ -0,0 +1,24 @@
+require "support/i18n_helpers"
+
+describe "The base i18n files" do
+  extend I18nHelpers
+
+  load_locales
+
+  locales_to_keys.each do |locale, keys|
+    unique_keys.each do |key|
+      it "should translate #{key} in locale #{locale} since it's present in some other locale" do
+        # Don't use "should include" or we get a ton of slow output.
+        keys.include?(key).should be_true, "Expected #{key} to be among the #{locale} locale's translation keys, but it wasn't"
+      end
+    end
+  end
+
+  locales_to_documents.each do |locale, documents|
+    unique_documents.each do |document|
+      it "should translate document #{document} in locale #{locale} since it's present in some other locale" do
+        documents.include?(document).should be_true, "Expected #{document} to be among the #{locale} locale's documents, but it wasn't"
+      end
+    end
+  end
+end
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		This is how we test that all translation keys match up between locales.

		Stuff that only goes in one locale (such as an admin section) or that can't be translated yet (if you use external translators) can simply go in files that don't match the path "config/locales/??.yml", like "config/locales/wip.fo.yml".