Markup - Added url function (#185)

markup/functions/url.md

@@ -0,0 +1,51 @@
+# url_*()
+
+## url()
+
+The `url()` function generates a fully qualified URL to the given path.
+
+```twig
+{{ url('blog') }}
+
+{#  https://site.com/blog #}
+```
+
+You can specify a variable as a function parameter:
+
+```twig
+{{ url(category.slug) }}
+
+{#  https://site.com/slug-value #}
+```
+
+In function parameters you can use concatenation:
+
+```twig
+{{ url('blog/post/' ~ post.id) }}
+
+{#  https://site.com/blog/post/123 #}
+```
+
+### Base URL
+
+You can get the base url like this:
+
+```twig
+{{ url('/') }}
+
+{#  https://site.com/ #}
+```
+
+## url_current()
+
+The `url_current()` function generates a fully qualified URL to the current path. Syntax:
+
+```twig
+{{ url_current() }}
+```
+
+An example of generating a canonical link using the `url_current()` function and the `|lower` Twig filter:
+
+```twig
+<link rel="canonical" href="{{ url_current()|lower }}" />
+```

markup/toc.yaml

@@ -53,3 +53,4 @@ sections:
             functions/form: "form_*()"
             functions/html: "html()"
             functions/dump: "dump()"
+            functions/url: "url_*()"