[FEATURE] projectPreprocessor: Add handling for task extensions

As per RFC0004: SAP/ui5-tooling#54
Depends on SAP/ui5-builder#106

lib/projectPreprocessor.js

@@ -336,6 +336,9 @@ class ProjectPreprocessor {
 		case "project-shim":
 			this.handleShim(extension);
 			break;
+		case "task":
+			this.handleTask(extension);
+			break;
 		default:
 			throw new Error(`Unknown extension type '${extension.type}' for ${extension.id}`);
 		}
@@ -349,6 +352,9 @@ class ProjectPreprocessor {
 	}
 
 	handleShim(extension) {
+		if (!extension.shims) {
+			throw new Error(`Project shim extension ${extension.id} is missing 'shim' configuration`);
+		}
 		const {configurations, dependencies, collections} = extension.shims;
 
 		if (configurations) {
@@ -465,6 +471,21 @@ class ProjectPreprocessor {
 			}
 		}
 	}
+
+	handleTask(extension) {
+		if (!extension.metadata && !extension.metadata.name) {
+			throw new Error(`Task extension ${extension.id} is missing 'metadata.name' configuration`);
+		}
+		if (!extension.task) {
+			throw new Error(`Task extension ${extension.id} is missing 'task' configuration`);
+		}
+		const taskRepository = require("@ui5/builder").tasks.taskRepository;
+
+		const taskPath = path.join(extension.path, extension.task.path);
+		const task = require(taskPath); // throws if not found
+
+		taskRepository.addTask(extension.metadata.name, task);
+	}
 }
 
 /**

test/fixtures/application.a/task.a.js

@@ -0,0 +1 @@
+module.exports = function () {};

test/lib/extensions.js

@@ -505,3 +505,68 @@ test("Project with unknown extension dependency inline configuration", (t) => {
 	return t.throws(projectPreprocessor.processTree(tree),
 		"Unknown extension type 'phony-pony' for extension.a", "Rejected with error");
 });
+
+test("Project with task extension dependency", (t) => {
+	// "project-type" extension handling not yet implemented => test currently checks for error
+	const tree = {
+		id: "application.a",
+		path: applicationAPath,
+		dependencies: [{
+			id: "ext.task.a",
+			path: applicationAPath,
+			dependencies: [],
+			version: "1.0.0",
+			specVersion: "0.1",
+			kind: "extension",
+			type: "task",
+			metadata: {
+				name: "task.a"
+			},
+			task: {
+				path: "task.a.js"
+			}
+		}],
+		version: "1.0.0",
+		specVersion: "0.1",
+		type: "application",
+		metadata: {
+			name: "xy"
+		}
+	};
+	return projectPreprocessor.processTree(tree).then((parsedTree) => {
+		t.deepEqual(parsedTree.dependencies.length, 0, "Application project has no dependencies");
+		const taskRepository = require("@ui5/builder").tasks.taskRepository;
+		t.truthy(taskRepository.getTask("task.a"), "task.a has been added to the task repository");
+	});
+});
+
+test("Project with task extension dependency - task module not found", async (t) => {
+	// "project-type" extension handling not yet implemented => test currently checks for error
+	const tree = {
+		id: "application.a",
+		path: applicationAPath,
+		dependencies: [{
+			id: "ext.task.a",
+			path: applicationAPath,
+			dependencies: [],
+			version: "1.0.0",
+			specVersion: "0.1",
+			kind: "extension",
+			type: "task",
+			metadata: {
+				name: "task.a"
+			},
+			task: {
+				path: "task.not.existing.js"
+			}
+		}],
+		version: "1.0.0",
+		specVersion: "0.1",
+		type: "application",
+		metadata: {
+			name: "xy"
+		}
+	};
+	const error = await t.throws(projectPreprocessor.processTree(tree));
+	t.regex(error.message, /^Cannot find module.*/, "Rejected with error");
+});