Add draw support for loading external DSL path files

lib/purple/client.rb

@@ -69,6 +69,23 @@ def path(name, method: :get, is_param: false)
         @parent_path = path.parent
       end
 
+      def draw(name)
+        call_site = caller_locations(1, 1).first
+        raise LoadError, 'Could not detect caller file for draw' if call_site.nil?
+
+        caller_file = call_site.absolute_path || call_site.path
+        raise LoadError, 'Could not detect caller file for draw' if caller_file.nil?
+
+        file_name = name.to_s
+        file_name += '.rb' unless file_name.end_with?('.rb')
+
+        route_path = File.expand_path(file_name, File.dirname(caller_file))
+
+        raise LoadError, "Your router tried to draw #{route_path}, but the file does not exist" unless File.exist?(route_path)
+
+        instance_eval(File.read(route_path), route_path.to_s)
+      end
+
       def root_method(method_name)
         current_path = @parent_path
 

spec/purple/client_spec.rb

@@ -145,6 +145,14 @@ class Unipile::Linkedin::PurpleClient < Purple::Client
   end
 end
 
+class DrawnClient < Purple::Client
+  domain 'https://example.com'
+
+  path :api do
+    draw 'support/drawn_client/v1'
+  end
+end
+
 RSpec.describe Unipile::Linkedin::PurpleClient do
   let(:resource) { double(:resource) }
   let(:headers) { {} }
@@ -207,3 +215,26 @@ class Unipile::Linkedin::PurpleClient < Purple::Client
   end
 end
 
+RSpec.describe DrawnClient do
+  let(:connection) { double('connection') }
+
+  before do
+    allow(connection).to receive(:headers=)
+    allow(Faraday).to receive(:new).and_yield(connection).and_return(connection)
+  end
+
+  describe '.warehouses' do
+    it 'loads nested paths and root methods from an external file' do
+      response = instance_double(Faraday::Response,
+                                 status: 200,
+                                 body: { warehouses: [{ id: 1, name: 'Main' }] }.to_json)
+
+      expect(connection).to receive(:get).with('https://example.com/api/v1/warehouses', {}).and_return(response)
+
+      result = described_class.warehouses
+
+      expect(result.warehouses.first.id).to eq(1)
+      expect(result.warehouses.first.name).to eq('Main')
+    end
+  end
+end

spec/purple/support/drawn_client/v1.rb

@@ -0,0 +1,16 @@
+path :v1 do
+  path :warehouses, method: :get do
+    root_method :warehouses
+
+    response :ok do
+      body(
+        warehouses: [
+          {
+            id: Integer,
+            name: String
+          }
+        ]
+      )
+    end
+  end
+end