Update Travis config to run format check

.travis.yml

@@ -1,6 +1,7 @@
-language: ruby
+matrix:
-rvm:
+  include:
-  - 2.4.1
+  - language: ruby
+    rvm: 2.4.1
 
     # Assume bundler is being used, therefore
     # the `install` step will run `bundle install` by default.
@@ -9,3 +10,10 @@ script: ./build.sh
     sudo: false # route your build to the container-based infrastructure for a faster build
 
     cache: bundler # caching bundler gem packages will speed up build
+
+  - language: node_js
+    node_js: v12.7.0
+    branches:
+      only:
+        - master
+    script: npm run format-test:html

bin/html-beautify-check.sh

@@ -1,12 +1,14 @@
+#!/bin/bash
+
 # A custom script, that formats the file(s) with html-beautify,
 # but instead of changing it, it only errors with 0/1 if it needs to be changed
 # Ref: https://web.archive.org/web/20190522172323/https://medium.com/@jtomaszewski/keep-your-code-clean-forever-65c71f7f2df
-APPDIR=$(realpath $(dirname $(dirname $0)))
+APPDIR=$(readlink -f $(dirname $(dirname $0)))
 TMPDIR=$(mktemp -d)
 cd $APPDIR
 
 for line in $*; do
-  filepath=$(realpath $line)
+  filepath=$(readlink -f $line)
   file=${filepath/$APPDIR\//}
   mkdir -p $TMPDIR/$(dirname $file)
   cp $APPDIR/$file $TMPDIR/$file

package.json

@@ -11,7 +11,7 @@
     "build": "bundle exec jekyll build",
     "serve": "bundle exec jekyll serve",
     "format:html": "node bin/get-html-ls.js | xargs node_modules/.bin/html-beautify -r",
-    "format-test:html": "node bin/get-html-ls.js | xargs bash bin/html-beautify-check.sh"
+    "format-test:html": "node bin/get-html-ls.js | xargs bash ./bin/html-beautify-check.sh"
   },
   "husky": {
     "hooks": {