Eliminates the use of translations that do not exist

lib/theme_check/checks/translation_key_exists.rb

@@ -29,7 +29,9 @@ def on_variable(node)
           "'#{key_node.value}' does not have a matching entry in '#{@theme.default_locale_json.relative_path}'",
           node: node,
           markup: key_node.value,
-        )
+        ) do |corrector|
+          corrector.add_translation_key(@theme, key_node.value, "TODO")
+        end
       end
     end
 

lib/theme_check/corrector.rb

@@ -36,5 +36,18 @@ def create_default_locale_json(theme)
       theme.default_locale_json = JsonFile.new("locales/#{theme.default_locale}.default.json", theme.storage)
       theme.default_locale_json.update_contents('{}')
     end
+
+    def add_translation_key(theme, key, value)
+      levels = key.split(".")
+      json = theme.default_locale_json.content
+
+      return json[levels[0]] = value if levels.length == 1
+
+      json[levels[0]] = {} if json[levels[0]].class != Hash
+      return json[levels[0]][levels[1]] = value if levels.length == 2
+
+      json[levels[0]][levels[1]] = {} if json[levels[0]][levels[1]].class != Hash
+      return json[levels[0]][levels[1]][levels[2]] = value if levels.length == 3
+    end
   end
 end

test/checks/translation_key_exists_test.rb

@@ -68,4 +68,49 @@ def test_counts_shopify_provided_translations_as_defined
 
     assert_offenses('', offenses)
   end
+
+  def test_creates_missing_keys
+    theme = make_theme(
+      "locales/en.default.json" => JSON.dump({}),
+      "templates/index.liquid" => <<~END,
+        {{"unknownkey" | t}}
+        {{"unknown.nested.key" | t}}
+        {{"unknownkey" | translate}}
+      END
+    )
+
+    analyzer = ThemeCheck::Analyzer.new(theme, [ThemeCheck::TranslationKeyExists.new], true)
+    analyzer.analyze_theme
+    analyzer.correct_offenses
+
+    expected = { "unknownkey" => "TODO", "unknown" => { "nested" => { "key" => "TODO" } } }
+    actual = theme.default_locale_json.content
+
+    assert_equal(expected, actual)
+  end
+
+  def test_creates_nested_missing_keys
+    theme = make_theme(
+      "locales/en.default.json" => JSON.dump({
+        key: "TODO",
+        nested: { key: "TODO" },
+        samplekey: { unknownkey: { key: "TODO" } },
+      }),
+      "templates/index.liquid" => <<~END,
+        {{"unknownkey" | t}}
+        {{"nested.unknownkey" | t}}
+        {{"samplekey.unknownkey.sample" | translate}}
+        {{"samplekey.example.sample" | translate}}
+      END
+    )
+
+    analyzer = ThemeCheck::Analyzer.new(theme, [ThemeCheck::TranslationKeyExists.new], true)
+    analyzer.analyze_theme
+    analyzer.correct_offenses
+
+    expected = { "key" => "TODO", "nested" => { "key" => "TODO", "unknownkey" => "TODO" }, "samplekey" => { "unknownkey" => { "key" => "TODO", "sample" => "TODO" }, "example" => { "sample" => "TODO" } }, "unknownkey" => "TODO" }
+    actual = theme.default_locale_json.content
+
+    assert_equal(expected, actual)
+  end
 end