Add view engine unit - handlebars - and response helpers

lib/src/http/response/PartialViewResponseFactory.ts

@@ -0,0 +1,18 @@
+import ResponseFactory from './ResponseFactory.ts'
+import ViewEngine from '../../unit/ViewEngine.ts'
+import {Request} from '../Request.ts'
+
+export default class PartialViewResponseFactory extends ResponseFactory {
+    constructor(
+        public readonly view: string,
+        public readonly context?: any,
+    ) {
+        super()
+    }
+
+    public async write(request: Request) {
+        const views: ViewEngine = this.make(ViewEngine)
+        request.response.body = await views.partial(this.view, this.context)
+        return request
+    }
+}

lib/src/http/response/ViewResponseFactory.ts

@@ -0,0 +1,19 @@
+import ResponseFactory from './ResponseFactory.ts'
+import ViewEngine from '../../unit/ViewEngine.ts'
+import {Request} from '../Request.ts'
+
+export default class ViewResponseFactory extends ResponseFactory {
+    constructor(
+        public readonly view: string,
+        public readonly context?: any,
+        public readonly layout?: string,
+    ) {
+        super()
+    }
+
+    public async write(request: Request) {
+        const views: ViewEngine = this.make(ViewEngine)
+        request.response.body = await views.render(this.view, this.context, this.layout)
+        return request
+    }
+}

lib/src/http/response/helpers.ts

@@ -8,6 +8,8 @@ import TemporaryRedirectResponseFactory from './TemporaryRedirectResponseFactory
 import {HTTPStatus} from '../../const/http.ts'
 import HTTPErrorResponseFactory from './HTTPErrorResponseFactory.ts'
 import HTTPError from '../../error/HTTPError.ts'
+import ViewResponseFactory from './ViewResponseFactory.ts'
+import PartialViewResponseFactory from './PartialViewResponseFactory.ts'
 
 export function json(value: any): JSONResponseFactory {
     return make(JSONResponseFactory, value)
@@ -33,3 +35,11 @@ export function redirect(destination: string): TemporaryRedirectResponseFactory
 export function http(status: HTTPStatus, message?: string): HTTPErrorResponseFactory {
     return make(HTTPErrorResponseFactory, new HTTPError(status, message))
 }
+
+export function view(view: string, context?: any, layout?: string): ViewResponseFactory {
+    return make(ViewResponseFactory, view, context, layout)
+}
+
+export function partial(view: string, context?: any): PartialViewResponseFactory {
+    return make(PartialViewResponseFactory, view, context)
+}