ci(travis): documentation check changes (#1062)

Essentially checking if the `yarn documentation` produces un-staged
files, if yes, then exiting with code 1.

.travis.yml

@@ -5,6 +5,8 @@ matrix:
       node_js: 8.9.3
       dist: trusty
       sudo: required
+      addons:
+        chrome: stable
 
 before_install:
   - if [ "$TRAVIS_OS_NAME" == "linux"  ]; then
@@ -20,9 +22,7 @@ script:
   - yarn test
   - yarn e2e
   - yarn checkcommit
-
+  - yarn documentation
-addons:
-  chrome: stable
 
 cache:
   directories:

package.json

@@ -17,7 +17,7 @@
     "test:nx": "yarn linknpm fast && ./scripts/test_nx.sh",
     "test": "yarn linknpm fast && ./scripts/test_nx.sh && ./scripts/test_schematics.sh",
     "checkformat": "./scripts/check_format.sh",
-    "documentation": "./scripts/documentation/documentation.sh && yarn format"
+    "documentation": "./scripts/documentation/documentation.sh && yarn format && ./scripts/documentation/check-documentation.sh"
   },
   "devDependencies": {
     "@angular-devkit/architect": "~0.12.2",

scripts/documentation/check-documentation.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+if [ -z "$(git status --porcelain ./docs)" ]; then
+  echo "📄 Documentation not modified";
+  exit 0;
+else
+  echo "📄 Documentation has been modified, you need to commit the changes.";
+  git status --porcelain ./docs
+  exit 1;
+fi