Automatically generate javascript files for react-intl when the server starts up.

Author: JasonYCHuang

lib/generators/react_on_rails/templates/base/base/config/initializers/react_on_rails.rb.tt

@@ -59,6 +59,16 @@ ReactOnRails.configure do |config|
   config.server_renderer_pool_size = 1 # increase if you're on JRuby
   config.server_renderer_timeout = 20 # seconds
 
+  ################################################################################
+  # I18N OPTIONS
+  ################################################################################
+  # Replace the following line to the location where you keep translation.js & default.js.
+  config.i18n_dir = Rails.root.join("client", "app", "libs", "i18n")
+  # Default locale
+  config.default_locale = "en"
+  # The location of rails locales
+  config.rails_locales_path = Rails.application.config.i18n.load_path
+
   ################################################################################
   # MISCELLANEOUS OPTIONS
   ################################################################################

lib/react_on_rails.rb

@@ -16,3 +16,4 @@
 require "react_on_rails/test_helper/webpack_assets_status_checker"
 require "react_on_rails/test_helper/ensure_assets_compiled"
 require "react_on_rails/test_helper/node_process_launcher"
+require "react_on_rails/locales_to_js"

lib/react_on_rails/configuration.rb

@@ -59,6 +59,9 @@ def self.configuration
       server_render_method: "",
       symlink_non_digested_assets_regex: /\.(png|jpg|jpeg|gif|tiff|woff|ttf|eot|svg|map)/,
       npm_build_test_command: "",
+      i18n_dir: "",
+      default_locale: "",
+      rails_locales_path: "",
       npm_build_production_command: ""
     )
   end
@@ -71,6 +74,7 @@ class Configuration
                   :skip_display_none, :generated_assets_dirs, :generated_assets_dir,
                   :webpack_generated_files, :rendering_extension, :npm_build_test_command,
                   :npm_build_production_command,
+                  :i18n_dir, :default_locale, :rails_locales_path,
                   :server_render_method, :symlink_non_digested_assets_regex
 
     def initialize(server_bundle_js_file: nil, prerender: nil, replay_console: nil,
@@ -81,12 +85,16 @@ def initialize(server_bundle_js_file: nil, prerender: nil, replay_console: nil,
                    generated_assets_dir: nil, webpack_generated_files: nil,
                    rendering_extension: nil, npm_build_test_command: nil,
                    npm_build_production_command: nil,
+                   i18n_dir: nil, default_locale: nil, rails_locales_path: nil,
                    server_render_method: nil, symlink_non_digested_assets_regex: nil)
       self.server_bundle_js_file = server_bundle_js_file
       self.generated_assets_dirs = generated_assets_dirs
       self.generated_assets_dir = generated_assets_dir
       self.npm_build_test_command = npm_build_test_command
       self.npm_build_production_command = npm_build_production_command
+      self.i18n_dir = i18n_dir
+      self.default_locale = default_locale
+      self.rails_locales_path = rails_locales_path
 
       self.prerender = prerender
       self.replay_console = replay_console

lib/react_on_rails/locales_to_js.rb

@@ -0,0 +1,104 @@
+require "erb"
+
+module ReactOnRails
+  class LocalesToJs
+    def initialize
+      @locale_files = set_locale_files
+      @default_locale = set_default_locale
+      @translations, @defaults = generate_translations
+    end
+
+    def convert
+      i18n_js_files.each do |f|
+        template = send("template_#{f}")
+        path = send("path_#{f}")
+        create_js_file(template, path)
+      end
+    end
+
+    private
+
+    def i18n_js_files
+      %w(translations_js default_js)
+    end
+
+    def create_js_file(template, path)
+      result = ERB.new(template).result()
+      File.open(path, "w") do |f|
+        f.write(result)
+      end
+    end
+
+    def generate_translations
+      translations = {}
+      defaults = {}
+      @locale_files.each do |f|
+        translation = YAML.load(File.open(f))
+        key = translation.keys[0]
+        val = flatten(translation[key])
+        translations = translations.deep_merge(key => val)
+        defaults = defaults.deep_merge(flatten_defaults(val)) if key == @default_locale
+      end
+      [translations.to_json, defaults.to_json]
+    end
+
+    def format(input)
+      input.to_s.tr(".", "_").camelize(:lower).to_sym
+    end
+
+    def flatten_defaults(val)
+      flatten(val).each_with_object({}) do |(k, v), h|
+        key = format(k)
+        h[key] = { id: k, defaultMessage: v }
+      end
+    end
+
+    def flatten(translations)
+      translations.each_with_object({}) do |(k, v), h|
+        if v.is_a? Hash
+          flatten(v).map { |hk, hv| h["#{k}.#{hk}".to_sym] = hv }
+        else
+          h[k] = v
+        end
+      end
+    end
+
+    def i18n_dir
+      ReactOnRails.configuration.i18n_dir
+    end
+
+    def set_locale_files
+      ReactOnRails.configuration.rails_locales_path
+    end
+
+    def set_default_locale
+      ReactOnRails.configuration.default_locale || "en"
+    end
+
+    def path_translations_js
+      i18n_dir + "translations.js"
+    end
+
+    def path_default_js
+      i18n_dir + "default.js"
+    end
+
+    def template_translations_js
+      <<-JS
+export const translations = #{@translations};
+      JS
+    end
+
+    def template_default_js
+      <<-JS
+import { defineMessages } from 'react-intl';
+
+const defaultLocale = \'#{@default_locale}\';
+
+const defaultMessages = defineMessages(#{@defaults});
+
+export { defaultMessages, defaultLocale };
+      JS
+    end
+  end
+end

spec/dummy/config/initializers/react_on_rails.rb

@@ -71,6 +71,16 @@ def self.custom_context(view_context)
   config.server_renderer_pool_size = 1 # increase if you're on JRuby
   config.server_renderer_timeout = 20 # seconds
 
+  ################################################################################
+  # I18N OPTIONS
+  ################################################################################
+  # Replace the following line to the location where you keep translation.js & default.js.
+  config.i18n_dir = Rails.root.join("client", "app", "libs", "i18n")
+  # Default locale
+  config.default_locale = "en"
+  # The location of rails locales
+  config.rails_locales_path = Rails.application.config.i18n.load_path
+
   ################################################################################
   # MISCELLANEOUS OPTIONS
   ################################################################################