Add web template to asinit (AssemblyScript#1996)

Author: romdotdog

Diff for: bin/asinit

@@ -47,13 +47,28 @@ const asinitOptions = {
     "description": "Answers all questions with their default option for non-interactive usage.",
     "type": "b",
     "alias": "y"
+  },
+  "web": {
+    "category": "General",
+    "description": "Adds an index.html file that can load your module. (Disables node without --node/-n flag)",
+    "type": "b",
+    "alias": "w"
+  },
+  "node": {
+    "category": "General",
+    "description": "Re-enables node files when using the --web/-w flag",
+    "type": "b",
+    "alias": "n"
   }
 };
 
 const cliOptions = options.parse(process.argv.slice(2), asinitOptions);
 
 if (cliOptions.options.help || cliOptions.arguments.length === 0) printHelp();
 
+const useWeb = cliOptions.options.web;
+const useNode = cliOptions.options.node || !useWeb;
+
 function printHelp() {
   console.log([
     "Sets up a new AssemblyScript project or updates an existing one.",
@@ -80,43 +95,44 @@ const buildDir = path.join(projectDir, "build");
 const testsDir = path.join(projectDir, "tests");
 const gitignoreFile = path.join(buildDir, ".gitignore");
 const packageFile = path.join(projectDir, "package.json");
+
+const indexHtml = path.join(projectDir, "index.html");
 const indexFile = path.join(projectDir, "index.js");
 const testsIndexFile = path.join(testsDir, "index.js");
 
+const basePaths = [
+  [assemblyDir, "Directory holding the AssemblyScript sources being compiled to WebAssembly."],
+  [tsconfigFile, "TypeScript configuration inheriting recommended AssemblyScript settings."],
+  [entryFile, "Example entry file being compiled to WebAssembly to get you started."],
+  [buildDir, "Build artifact directory where compiled WebAssembly files are stored."],
+  [gitignoreFile, "Git configuration that excludes compiled binaries from source control."],
+  [asconfigFile, "Configuration file defining both a 'debug' and a 'release' target."],
+  [packageFile, "Package info containing the necessary commands to compile to WebAssembly."]
+];
+
+const nodePaths = [
+  [indexFile, "Main file loading the WebAssembly module and exporting its exports."],
+  [testsIndexFile, "Example test to check that your module is indeed working."]
+];
+
+const webPaths = [
+  [indexHtml, "Starter HTML file that loads your module."]
+];
+
+const paths = basePaths;
+if (useNode) Array.prototype.push.apply(paths, nodePaths);
+if (useWeb) Array.prototype.push.apply(paths, webPaths);
+
+const formatPath = filePath => "./" + path.relative(projectDir, filePath).replace(/\\/g, "/");
+
 console.log([
   "Version: " + version,
   "",
   colors.white([
     "This command will make sure that the following files exist in the project",
     "directory '" + projectDir + "':"
   ].join("\n")),
-  "",
-  colors.cyan("  ./assembly"),
-  "  Directory holding the AssemblyScript sources being compiled to WebAssembly.",
-  "",
-  colors.cyan("  ./assembly/tsconfig.json"),
-  "  TypeScript configuration inheriting recommended AssemblyScript settings.",
-  "",
-  colors.cyan("  ./assembly/index.ts"),
-  "  Example entry file being compiled to WebAssembly to get you started.",
-  "",
-  colors.cyan("  ./build"),
-  "  Build artifact directory where compiled WebAssembly files are stored.",
-  "",
-  colors.cyan("  ./build/.gitignore"),
-  "  Git configuration that excludes compiled binaries from source control.",
-  "",
-  colors.cyan("  ./index.js"),
-  "  Main file loading the WebAssembly module and exporting its exports.",
-  "",
-  colors.cyan("  ./tests/index.js"),
-  "  Example test to check that your module is indeed working.",
-  "",
-  colors.cyan("  ./asconfig.json"),
-  "  Configuration file defining both a 'debug' and a 'release' target.",
-  "",
-  colors.cyan("  ./package.json"),
-  "  Package info containing the necessary commands to compile to WebAssembly.",
+  ...paths.map(([filePath, description]) => "\n  " + colors.cyan(formatPath(filePath)) + "\n  " + description),
   "",
   "The command will try to update existing files to match the correct settings",
   "for this instance of the compiler in '" + compilerDir + "'.",
@@ -136,10 +152,18 @@ function createProject(answer) {
   ensureBuildDirectory();
   ensureGitignore();
   ensurePackageJson();
-  ensureIndexJs();
-  ensureTestsDirectory();
-  ensureTestsIndexJs();
   ensureAsconfigJson();
+
+  if (useNode) {
+    ensureIndexJs();
+    ensureTestsDirectory();
+    ensureTestsIndexJs();
+  }
+
+  if (useWeb) {
+    ensureIndexHtml();
+  }
+
   console.log([
     colors.green("Done!"),
     "",
@@ -171,10 +195,12 @@ function createProject(answer) {
     "  ^ The optimized WebAssembly module using default optimization settings.",
     "    You can change the optimization settings in '" + colors.cyan("package.json")+ "'.",
     "",
-    "To run the tests, do:",
-    "",
-    colors.white("  " + commands[pm].test),
-    "",
+    ...(useNode ? [
+      "To run the tests, do:",
+      "",
+      colors.white("  " + commands[pm].test),
+      ""
+    ] : []),
     "The AssemblyScript documentation covers all the details:",
     "",
     "  https://docs.assemblyscript.org",
@@ -326,11 +352,13 @@ function ensurePackageJson() {
         "asbuild:untouched": buildUntouched,
         "asbuild:optimized": buildOptimized,
         "asbuild": buildAll,
-        "test": "node tests"
-      },
-      "dependencies": {
-        "@assemblyscript/loader": "^" + compilerVersion
+        ...(useNode && {"test": "node tests"})
       },
+      ...(useNode && {
+        "dependencies": {
+          "@assemblyscript/loader": "^" + compilerVersion
+        }
+      }),
       "devDependencies": {
         "assemblyscript": "^" + compilerVersion
       }
@@ -347,13 +375,13 @@ function ensurePackageJson() {
       pkg["scripts"] = scripts;
       updated = true;
     }
-    if (!scripts["test"] || scripts["test"] == npmDefaultTest) {
+    if (!scripts["test"] || scripts["test"] == npmDefaultTest && useNode) {
       scripts["test"] = "node tests";
       pkg["scripts"] = scripts;
       updated = true;
     }
     let dependencies = pkg["dependencies"] || {};
-    if (!dependencies["@assemblyscript/loader"]) {
+    if (!dependencies["@assemblyscript/loader"] && useNode) {
       dependencies["@assemblyscript/loader"] = "^" + compilerVersion;
       pkg["dependencies"] = dependencies;
       updated = true;
@@ -422,3 +450,34 @@ function ensureTestsIndexJs() {
   }
   console.log();
 }
+
+function ensureIndexHtml() {
+  console.log("- Making sure that 'index.html' exists...");
+  if (!fs.existsSync(indexHtml)) {
+    fs.writeFileSync(indexHtml, [
+      "<!DOCTYPE html>",
+      "<html lang=\"en\">",
+      "  <head>",
+      "    <script src=\"https://cdn.jsdelivr.net/npm/@assemblyscript/loader/umd/index.js\"></script>",
+      "    <script>",
+      "      const imports = {",
+      "        /* imports go here */",
+      "      };",
+      "",
+      "      loader",
+      "        .instantiateStreaming(fetch(\"build/optimized.wasm\"), imports)",
+      "        .then(wasmModule => {",
+      "          const { add } = wasmModule.exports;",
+      "          document.body.innerText = add(1, 2);",
+      "        });",
+      "    </script>",
+      "  </head>",
+      "  <body></body>",
+      "</html>",
+    ].join("\n") + "\n");
+    console.log(colors.green("  Created: ") + indexHtml);
+  } else {
+    console.log(colors.yellow("  Exists: ") + indexHtml);
+  }
+  console.log();
+}