fix: make setup-cpp --version/help immutable

src/cli-options.ts

@@ -7,8 +7,6 @@ import type { InstallationInfo } from "./utils/setup/setupBin.js"
 
 export function parseArgs(args: string[]): Opts {
   const defaults = Object.fromEntries(inputs.map((inp) => [inp, maybeGetInput(inp)]))
-  defaults["setup-cpp"] = "true"
-
   return mri<Record<Inputs, string | undefined> & { help: boolean; version: boolean; "setup-cpp": boolean }>(args, {
     string: [...inputs, "timeout", "node-package-manager"],
     default: defaults,
@@ -70,7 +68,7 @@ export type Opts = mri.Argv<
   Record<Inputs, string | undefined> & {
     help: boolean
     version: boolean
-    "setup-cpp": boolean
+    "setup-cpp"?: boolean
     timeout?: string
     "node-package-manager"?: string
   }

src/setup-cpp.ts

@@ -28,10 +28,6 @@ async function main(args: string[]): Promise<number> {
   // parse options using mri or github actions
   const opts = parseArgs(args)
 
-  const installSetupCppPromise = opts["setup-cpp"]
-    ? installSetupCpp(packageJson.version, opts["node-package-manager"])
-    : Promise.resolve()
-
   // print help
   if (opts.help) {
     printHelp()
@@ -129,13 +125,20 @@ async function main(args: string[]): Promise<number> {
 
   await finalizeRC(rcOptions)
 
-  if (successMessages.length === 0 && errorMessages.length === 0) {
-    if (!opts.version && !opts.help) {
-      info("setup-cpp was called without any arguments. Nothing to do.")
-    }
-    return 0
+  const noTool = successMessages.length === 0 && errorMessages.length === 0
+
+  // if setup-cpp option is not passed, install setup-cpp by default unless only help or version is passed
+  // So that --help and --version are immutable
+  if (opts["setup-cpp"] === undefined) {
+    opts["setup-cpp"] = !(noTool && (opts.version || opts.help))
   }
 
+  const installSetupCppPromise = opts["setup-cpp"]
+    ? installSetupCpp(packageJson.version, opts["node-package-manager"])
+    : Promise.resolve()
+
+  await Promise.all([checkUpdatePromise, installSetupCppPromise])
+
   // report the messages in the end
   for (const tool of successMessages) {
     success(tool)
@@ -144,27 +147,26 @@ async function main(args: string[]): Promise<number> {
     error(tool)
   }
 
-  info("setup-cpp finished")
+  if (successMessages.length !== 0 || errorMessages.length !== 0) {
+    info("setup-cpp finished")
 
-  if (!GITHUB_ACTIONS) {
-    switch (process.platform) {
-      case "win32": {
-        warning("Run `RefreshEnv.cmd` or restart your shell to update the environment.")
-        break
-      }
-      case "linux":
-      case "darwin": {
-        warning("Run `source ~/.cpprc` or restart your shell to update the environment.")
-        break
-      }
-      default: {
-        // nothing
+    if (!GITHUB_ACTIONS) {
+      switch (process.platform) {
+        case "win32": {
+          warning("Run `RefreshEnv.cmd` or restart your shell to update the environment.")
+          break
+        }
+        case "linux":
+        case "darwin": {
+          warning("Run `source ~/.cpprc` or restart your shell to update the environment.")
+          break
+        }
+        default: {
+          // nothing
+        }
       }
     }
   }
-
-  await Promise.all([checkUpdatePromise, installSetupCppPromise])
-
   return errorMessages.length === 0 ? 0 : 1 // exit with non-zero if any error message
 }