Fix deploy logic for custom domains

Author: samselikoff

lib/deploy/plugin.js

@@ -64,7 +64,8 @@ module.exports = class AddonDocsDeployPlugin {
 
   _verifyRedirectFile(stagingDirectory) {
     let vendorDir = `${__dirname}/../../vendor/ember-cli-addon-docs`;
-    let segmentCount = this._getRootURL().split('/').length;
+    let rootURL = this._getRootURL();
+    let segmentCount = rootURL === '' ? 0 : rootURL.split('/').length;
     let redirectContents = fs.readFileSync(`${vendorDir}/404.html`, 'utf-8');
     let redirects = this._discoverOldPaths(stagingDirectory);
 
@@ -151,9 +152,10 @@ module.exports = class AddonDocsDeployPlugin {
   _updateIndexContents(context, stagingDirectory, appRoot, deployVersion) {
     let indexPath = `${stagingDirectory}/${appRoot}/index.html`;
     let rootURL = [this._getRootURL(), appRoot].filter(Boolean).join('/');
+    let addonDocsRootURL = rootURL === '' ? '/' : `/${rootURL}/`;
     let contents = fs.readFileSync(indexPath, 'utf-8');
     let encodedVersion = encodeURIComponent(JSON.stringify(deployVersion));
-    let updated = contents.replace(/\/?ADDON_DOCS_ROOT_URL\/?/g, `/${rootURL}/`)
+    let updated = contents.replace(/\/?ADDON_DOCS_ROOT_URL\/?/g, addonDocsRootURL)
       .replace(/%22ADDON_DOCS_DEPLOY_VERSION%22/g, encodedVersion);
 
     fs.writeFileSync(indexPath, updated);