From 6b646256e26a28ffd89339b0acab0f86d70f7acc Mon Sep 17 00:00:00 2001
From: Jared White <jared@jaredwhite.com>
Date: Tue, 1 Sep 2020 09:36:14 -0700
Subject: [PATCH] First pass at implementing site locales and translations

---
 .../concerns/site/localizable.rb              | 20 +++++++++++++++++++
 .../lib/bridgetown-core/configuration.rb      |  2 ++
 .../lib/bridgetown-core/drops/site_drop.rb    |  2 +-
 .../lib/bridgetown-core/ruby_template_view.rb |  4 ++++
 bridgetown-core/lib/bridgetown-core/site.rb   |  2 ++
 bridgetown-core/lib/bridgetown-core/tags/t.rb | 14 +++++++++++++
 6 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 bridgetown-core/lib/bridgetown-core/concerns/site/localizable.rb
 create mode 100644 bridgetown-core/lib/bridgetown-core/tags/t.rb

diff --git a/bridgetown-core/lib/bridgetown-core/concerns/site/localizable.rb b/bridgetown-core/lib/bridgetown-core/concerns/site/localizable.rb
new file mode 100644
index 000000000..672322d63
--- /dev/null
+++ b/bridgetown-core/lib/bridgetown-core/concerns/site/localizable.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module Bridgetown
+  module Site::Localizable
+    def locale
+      if @locale
+        @locale
+      else
+        @locale = ENV.fetch("BRIDGETOWN_LOCALE", config[:default_locale]).to_sym
+        I18n.load_path << Dir[in_source_dir("_locales") + "/*.yml"]
+        I18n.available_locales = config[:available_locales]
+        I18n.default_locale = @locale
+      end
+    end
+
+    def locale=(new_locale)
+      I18n.locale = @locale = new_locale.to_sym
+    end
+  end
+end
diff --git a/bridgetown-core/lib/bridgetown-core/configuration.rb b/bridgetown-core/lib/bridgetown-core/configuration.rb
index 957864099..9a59ca4a5 100644
--- a/bridgetown-core/lib/bridgetown-core/configuration.rb
+++ b/bridgetown-core/lib/bridgetown-core/configuration.rb
@@ -52,6 +52,8 @@ class Configuration < ActiveSupport::HashWithIndifferentAccess
       "show_dir_listing"     => false,
 
       # Output Configuration
+      "available_locales"    => ["en"],
+      "default_locale"       => "en",
       "permalink"            => "date",
       "timezone"             => nil, # use the local timezone
 
diff --git a/bridgetown-core/lib/bridgetown-core/drops/site_drop.rb b/bridgetown-core/lib/bridgetown-core/drops/site_drop.rb
index 6fb69d1d0..b50bcb061 100644
--- a/bridgetown-core/lib/bridgetown-core/drops/site_drop.rb
+++ b/bridgetown-core/lib/bridgetown-core/drops/site_drop.rb
@@ -8,7 +8,7 @@ class SiteDrop < Drop
       mutable false
 
       def_delegator  :@obj, :data
-      def_delegators :@obj, :time, :pages, :static_files, :tags, :categories
+      def_delegators :@obj, :locale, :time, :pages, :static_files, :tags, :categories
 
       private def_delegator :@obj, :config, :fallback_data
 
diff --git a/bridgetown-core/lib/bridgetown-core/ruby_template_view.rb b/bridgetown-core/lib/bridgetown-core/ruby_template_view.rb
index aa4bbdbd7..94b3bb682 100644
--- a/bridgetown-core/lib/bridgetown-core/ruby_template_view.rb
+++ b/bridgetown-core/lib/bridgetown-core/ruby_template_view.rb
@@ -20,6 +20,10 @@ def initialize(site)
       def webpack_path(asset_type)
         Bridgetown::Utils.parse_webpack_manifest_file(@site, asset_type.to_s)
       end
+
+      def t(*args)
+        I18n.send :t, *args
+      end
     end
 
     attr_reader :layout, :page, :site, :content
diff --git a/bridgetown-core/lib/bridgetown-core/site.rb b/bridgetown-core/lib/bridgetown-core/site.rb
index 0d1da2afa..ad1d05d97 100644
--- a/bridgetown-core/lib/bridgetown-core/site.rb
+++ b/bridgetown-core/lib/bridgetown-core/site.rb
@@ -7,6 +7,7 @@ class Site
     include Configurable
     include Content
     include Extensible
+    include Localizable
     include Processable
     include Renderable
     include Writable
@@ -25,6 +26,7 @@ class Site
     # config - A Hash containing site configuration details.
     def initialize(config)
       self.config = config
+      locale
 
       @plugin_manager  = PluginManager.new(self)
       @cleaner         = Cleaner.new(self)
diff --git a/bridgetown-core/lib/bridgetown-core/tags/t.rb b/bridgetown-core/lib/bridgetown-core/tags/t.rb
new file mode 100644
index 000000000..cf31d8c2e
--- /dev/null
+++ b/bridgetown-core/lib/bridgetown-core/tags/t.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module Bridgetown
+  module Tags
+    class TranslationTag < Liquid::Tag
+      def render(_context)
+        key = @markup.strip
+        I18n.t(key)
+      end
+    end
+  end
+end
+
+Liquid::Template.register_tag("t", Bridgetown::Tags::TranslationTag)