Introduce TypeScript

Set up TypeScript (add source directory and config file).
The JavaScript files in `javascripts` can now be generated
by running `tsc` in the root directory.

This might be useful for future changes of the JavaScript.
It does not affect the normal build process of the site.

Author: stomar

_config.yml

@@ -18,6 +18,7 @@ exclude:
   - lib
   - test
   - vendor
+  - tsconfig.json
 
 url: https://www.ruby-lang.org
 

_javascripts_src/examples.ts

@@ -0,0 +1,16 @@
+var Examples = {
+    names: ['cities', 'greeter', 'i_love_ruby', 'hello_world'],
+
+    random: function () {
+        return Examples.names[Math.floor(Math.random() * Examples.names.length)];
+    },
+
+    choose: function () {
+        var lang = document.location.pathname.split('/')[1];
+        var name = Examples.random();
+
+        $("#code").load('/' + lang + '/examples/' + name + '/');
+    }
+};
+
+$(document).ready(Examples.choose);

_javascripts_src/page.ts

@@ -0,0 +1,24 @@
+var Page = {
+    SiteLinks: {
+        highlight: function () {
+            var current_page = location.pathname;
+            $("#header div.site-links a:not(.home)").each(function (i) {
+                if (current_page.indexOf($(this).attr('href')) == 0) {
+                    $(this).addClass('selected');
+                }
+            });
+
+            $("#home-page-layout #header div.site-links a.home").addClass('selected');
+        },
+
+        menu: function () {
+            $("#header div.site-links a.menu").on('click touchstart', function (event) {
+                $(this).closest("div.site-links").toggleClass("open");
+                event.preventDefault();
+            });
+        }
+    }
+};
+
+$(Page.SiteLinks.highlight);
+$(Page.SiteLinks.menu);

tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "compilerOptions": {
+    "outDir": "./javascripts",
+
+    "target": "es5",
+    "strict": true
+  },
+  "include": ["./_javascripts_src/**/*"]
+}