Add cli option --preview-app-bundle-path

Signed-off-by: Morgan Bentell <mbentell@spotify.com>

packages/techdocs-cli/src/commands/index.ts

@@ -251,6 +251,10 @@ export function registerCommands(program: Command) {
     )
     .option('--mkdocs-port <PORT>', 'Port for MkDocs server to use', '8000')
     .option('-v --verbose', 'Enable verbose output.', false)
+    .option(
+      '--preview-app-bundle-path <PATH>',
+      'Preview documentation using another web app',
+    )
     .action(lazy(() => import('./serve/serve').then(m => m.default)));
 }
 

packages/techdocs-cli/src/commands/serve/serve.ts

@@ -42,9 +42,15 @@ function findPreviewBundlePath(): string {
   }
 }
 
+function getPreviewAppPath(opts: OptionValues): string {
+  return opts.previewAppBundlePath ?? findPreviewBundlePath();
+}
+
 export default async function serve(opts: OptionValues) {
   const logger = createLogger({ verbose: opts.verbose });
 
+  console.log(opts.previewAppBundlePath);
+
   // Determine if we want to run in local dev mode or not
   // This will run the backstage http server on a different port and only used
   // for proxying mkdocs to the backstage app running locally (e.g. with webpack-dev-server)
@@ -117,7 +123,7 @@ export default async function serve(opts: OptionValues) {
 
   const port = isDevMode ? backstageBackendPort : backstagePort;
   const httpServer = new HTTPServer(
-    findPreviewBundlePath(),
+    getPreviewAppPath(opts),
     port,
     opts.mkdocsPort,
     opts.verbose,