VSO. 3341632: Code to make template target a single host needs to be in the templates themselves (#33)

`npm run convert-to-single-host {host}` will modify the project so it only targets a single host.
This will be used by generator-office so that the code to do this resides in the template itself.

Author: TCourtneyOwen

convertToSingleHost.js

@@ -0,0 +1,75 @@
+const fs = require("fs");
+const host = process.argv[2];
+const hosts = ["excel", "onenote", "outlook", "powerpoint", "project", "word"];
+const util = require("util");
+const readFileAsync = util.promisify(fs.readFile);
+const unlinkFileAsync = util.promisify(fs.unlink);
+const writeFileAsync = util.promisify(fs.writeFile);
+
+async function modifyProjectForSingleHost(host) {
+  if (!host) {
+    throw new Error("The host was not provided.");
+  }
+  if (!hosts.includes(host)) {
+    throw new Error(`'${host}' is not a supported host.`);
+  }
+  await convertProjectToSingleHost(host);
+  await updatePackageJsonForSingleHost(host);
+}
+
+async function convertProjectToSingleHost(host) {
+  // copy host-specific manifest over manifest.xml
+  const manifestContent = await readFileAsync(`./manifest.${host}.xml`, "utf8");
+  await writeFileAsync(`./manifest.xml`, manifestContent);
+
+  // copy over host-specific taskpane code to taskpane.ts
+  const srcContent = await readFileAsync(`./src/taskpane/${host}.ts`, "utf8");
+  await writeFileAsync(`./src/taskpane/taskpane.ts`, srcContent);
+
+  // delete all host-specific files
+  hosts.forEach(async function(host) {
+    await unlinkFileAsync(`./manifest.${host}.xml`);
+    await unlinkFileAsync(`./src/taskpane/${host}.ts`);
+  });
+
+  // delete this script
+  await unlinkFileAsync("./convertToSingleHost.js");
+}
+
+async function updatePackageJsonForSingleHost(host) {
+  // update package.json to reflect selected host
+  const packageJson = `./package.json`;
+  const data = await readFileAsync(packageJson, "utf8");
+  let content = JSON.parse(data);
+
+  // update 'config' section in package.json to use selected host
+  content.config["app-to-debug"] = host;
+
+  // update sideload and unload scripts to use selected host.
+  ["sideload", "unload"].forEach(key => {
+    content.scripts[key] = content.scripts[`${key}:${host}`];
+  });
+
+  // remove scripts that are unrelated to the selected host
+  Object.keys(content.scripts).forEach(function(key) {
+    if (key.startsWith("sideload:") 
+      || key.startsWith("unload:") 
+      || key === "convert-to-single-host"
+    ) {
+      delete content.scripts[key];
+    }
+  });
+
+  // write updated json to file
+  await writeFileAsync(packageJson, JSON.stringify(content, null, 2));
+}
+
+
+/**
+ * Modify the project so that it only supports a single host.
+ * @param host The host to support.
+ */
+modifyProjectForSingleHost(host).catch(err => {
+    console.error(`Error: ${err instanceof Error ? err.message : err}`);
+    process.exitCode = 1;
+});

package.json

@@ -14,6 +14,7 @@
   "scripts": {
     "build": "webpack -p --mode production",
     "build-dev": "webpack --mode development",
+    "convert-to-single-host": "node convertToSingleHost.js",
     "dev-server": "webpack-dev-server --mode development",
     "sideload": "echo Please specify which app using 'npm run sideload:app'.",
     "sideload:excel": "office-toolbox sideload -m manifest.xml -a excel",