Re-organise cli.ts into functions and sub-commands

Add the necessary boilerplate for cli.ts to provide more than one
command, with the resource gathering step split out from the build
step in order for it to be re-usable.

cli.ts

@@ -19,22 +19,67 @@ function pageToHtml(page: Page) {
 	)
 }
 
-const outDir = "build/web";
+function assembleResources() {
-if (!fs.existsSync(outDir)) {
+	const webDir = "public";
-	fs.mkdirSync(outDir);
+	const resources = new Map<string, string | Page>();
+	for (const entry of fs.readdirSync(webDir, { recursive: true, withFileTypes: true })) {
+		if (!entry.isFile())
+			continue;
+		const parentPath = entry.parentPath.replace(/\\/g, "/");
+		const ref = `${parentPath.slice(webDir.length)}/${entry.name}`;
+		resources.set(ref, `${parentPath}/${entry.name}`);
+	}
+	for (const page of pages) {
+		if (resources.has(page.ref)) {
+			const existing = resources.get(page.ref)!;
+			const other = typeof existing === "string" ? "a static resource" : `"${existing.title}"`;
+			throw new Error(`ref "${page.ref}" is taken up by both "${page.title}" and ${other}`)
+		}
+		resources.set(page.ref, page);
+	}
+	return resources;
 }
 
-for (const page of pages) {
+function build() {
-	const dirSep = page.ref.indexOf("/", 1);
+	const outDir = "build/web";
-	if (dirSep !== -1) {
+	const dirsCreated = new Set<string>()
-		const dir = `${outDir}/${page.ref.slice(0, dirSep)}`;
+	for (const [ref, resource] of assembleResources()) {
-		if (!fs.existsSync(dir)) {
+		const refDir = `${outDir}${posix.dirname(ref)}`;
-			fs.mkdirSync(dir);
+		if (!dirsCreated.has(refDir)) {
+			fs.mkdirSync(refDir, { recursive: true });
 		}
+		console.log(`writing ${outDir}${ref}`);
+		let content;
+		if (typeof resource === "string") {
+			content = fs.readFileSync(resource);
+		} else {
+			content = pageToHtml(resource);
+		}
+		fs.writeFileSync(`${outDir}${ref}`, content);
 	}
-	console.log(`writing ${outDir}${page.ref}`);
-	fs.writeFileSync(`${outDir}${page.ref}`, pageToHtml(page));
 }
 
-console.log(`writing ${outDir}/style.css`);
+function printUsage() {
-fs.writeFileSync(`${outDir}/style.css`, fs.readFileSync("public/style.css"));
+	console.log("Usage: cli.js <cmd>");
+	console.log("    build - Copy resources and generated pages to build directory.");
+}
+
+function main(runtime: string, script: string, args: string[]) {
+	if (!args.length) {
+		printUsage();
+		process.exitCode = 1;
+		return;
+	}
+
+	const [command, ...commandArgs] = args;
+	if (command === "build") {
+		build();
+	} else {
+		console.log(`Error: Unkown sub-command ${command}`);
+		printUsage();
+		process.exitCode = 1;
+	}
+}
+
+const [runtime, script, ...args] = process.argv;
+main(runtime, script, args)

package.json

@@ -6,7 +6,7 @@
 	"main": "build/node/index.js",
 	"scripts": {
 		"prepare": "tsc",
-		"build": "node --enable-source-maps build/node/cli.js",
+		"build": "node --enable-source-maps build/node/cli.js build",
 		"test": "node --test --enable-source-maps --experimental-test-coverage"
 	},
 	"dependencies": {