Create a manifest

Author: moonglum

lib/build-bundler.js

@@ -23,6 +23,7 @@ module.exports = ({ source, target, fingerprint, configDir }) => {
 					return createFile(targetPath, content).then(_ => {
 						return {
 							changed: true,
+							target: path.relative(configDir, sourcePath),
 							output: path.relative(configDir, targetPath)
 						};
 					});

lib/build-manifest-writer.js

@@ -0,0 +1,35 @@
+let { createFile } = require("faucet-pipeline-util");
+let { basename } = require("path");
+
+// Create a writer for a manifest
+//
+// The writer writes the manifest, always extending the previous manifest
+// so that it also support partial builds in a watch process
+module.exports = manifestConfig => {
+	if(manifestConfig === false) {
+		return results => Promise.resolve(results);
+	}
+
+	let manifest = {};
+	return results => {
+		let filteredResults = results.filter(result => result.changed);
+		if(filteredResults.length === 0) {
+			return results;
+		}
+
+		manifest = updateManifest(filteredResults, manifest, manifestConfig);
+		return writeManifest(filteredResults, manifest, manifestConfig);
+	};
+};
+
+function updateManifest(results, manifest, { baseURI }) {
+	return results.reduce((acc, result) => {
+		acc[result.target] = baseURI(result.output, basename(result.output));
+		return acc;
+	}, manifest);
+}
+
+function writeManifest(results, manifest, manifestConfig) {
+	return createFile(manifestConfig.file, `${JSON.stringify(manifest)}\n`).
+		then(_ => results);
+}

lib/build-reporter.js

@@ -3,7 +3,7 @@
 // Reports the results of the run
 module.exports = _ => {
 	return results => {
-		results.reduce((acc, cur) => acc.concat(cur)).forEach(res => {
+		results.forEach(res => {
 			if(res.changed) {
 				console.log(`✓ ${res.output}`); // eslint-disable-line no-console
 			}

lib/index.js

@@ -1,6 +1,7 @@
 let buildConfig = require("./build-config");
 let buildBundler = require("./build-bundler");
 let buildReporter = require("./build-reporter");
+let buildManifestWriter = require("./build-manifest-writer");
 
 module.exports = (rawConfig, configDir, { watcher, fingerprint }) => {
 	let config = buildConfig(rawConfig, configDir, fingerprint);
@@ -17,9 +18,16 @@ module.exports = (rawConfig, configDir, { watcher, fingerprint }) => {
 function buildBundleAll(config) {
 	let bundlers = config.bundles.map(bundleConfig => buildBundler(bundleConfig));
 	let report = buildReporter();
+	let writeManifest = buildManifestWriter(config.manifest);
 
 	return files => {
-		Promise.all(bundlers.map(bundler => bundler(files))).then(report);
+		Promise.all(bundlers.map(bundler => bundler(files))).
+			then(flatten).
+			then(writeManifest).
+			then(report);
 	};
-	// TODO: Manifest
+}
+
+function flatten(arr) {
+	return arr.reduce((acc, cur) => acc.concat(cur));
 }

test/run

@@ -58,8 +58,8 @@ begin "./test_basic"
 	assert_identical "./dist/test.txt" "./src/test.txt"
 end
 
-# Once again with fingerprinting
-begin "./test_basic"
+begin "./test_fingerprint"
 	faucet
 	assert_identical "./dist/test-e59ff97941044f85df5297e1c302d260.txt" "./src/test.txt"
+	assert_identical "./dist/manifest.json" "./expected.json"
 end

test/test_basic/expected.css

@@ -0,0 +1 @@
+{"src/test.txt":"/assets/dist/test-e59ff97941044f85df5297e1c302d260.txt"}

test/test_fingerprint/expected.json

@@ -0,0 +1,14 @@
+"use strict";
+
+module.exports = {
+	static: {
+		manifest: {
+			file: "./dist/manifest.json",
+			baseURI: "/assets"
+		},
+		bundles: [{
+			source: "src",
+			target: "dist"
+		}]
+	}
+};

test/test_fingerprint/faucet.config.js

@@ -0,0 +1 @@
+Hello World