Add render macro to kemal core to have dynamic rendering mechanism. It actually binds built-in ecr parser to the Kemal as a macro.

README.md

@@ -147,6 +147,22 @@ end
 Kemal.config.add_handler CustomHandler.new
 ```
 
+### Views
+
+You can use ERB-like built-in **ECR** views to render files.
+
+```crystal
+get '/:name' do
+  render "views/hello.ecr"
+end
+```
+
+And you should have an `hello.ecr` view. It will have the same context as the method.
+
+```erb
+Hello <%= env.params["name"] %>
+```
+
 ## Static Files
 
 Kemal has built-in support for serving your static files. You need to put your static files under your ```/public``` directory.

docs/README.md

@@ -23,7 +23,7 @@ Kemal means *Mature, grown up* in Turkish.
 ## How to start?
 
  - [Getting Started Tutorial](./tutorial.md)
- - [Using Dynamic Templates (Not Supported Yet)](./templates.md)
+ - [Using Dynamic Views](./views.md)
  - [Parsing HTTP requests and Form Data](./http-requests.md)
  - [Uploading Files](./upload.md)
  - [Serving Static Files](./statics.md)

docs/views.md

@@ -0,0 +1,28 @@
+# Views
+
+You can use ECR to build views. Kemal serves a `render` macro to use built-in `ECR`
+library.
+
+## Writing Views
+
+The ECR is actually ERB.
+
+```
+src/
+  views/
+    hello.ecr
+```
+
+Write `hello.ecr`
+```erb
+Hello <%= your_name %>
+```
+
+## Embedding View File
+
+```crystal
+get '/' do |env|
+  your_name = "Kemal"
+  render "views/hello.ecr"
+end
+```

spec/asset/hello.ecr

@@ -0,0 +1 @@
+Hello <%= env.params["name"] %>

spec/view_spec.cr

@@ -0,0 +1,13 @@
+require "./spec_helper"
+
+describe "Views" do
+  it "renders file" do
+    kemal = Kemal::Handler.new
+    kemal.add_route "GET", "/view/:name" do |env|
+      render "spec/asset/hello.ecr"
+    end
+    request = HTTP::Request.new("GET", "/view/world")
+    response = kemal.call(request)
+    response.body.should contain("Hello world")
+  end
+end

src/kemal/view.cr

@@ -0,0 +1,14 @@
+# Kemal render uses built-in ECR to render methods.
+
+## Usage
+# get '/' do
+#   render 'hello.ecr'
+# end
+
+require "ecr/macros"
+
+macro render(filename)
+  String.build do |__view__|
+    embed_ecr {{filename}}, "__view__"
+  end
+end