UPDATE! I decided to drop the below functions. I just use whatever applicable/available with Hugo Built-in Functions and Clipboard.js. Please refer to the JS section below. SYNTAX HIGHLIGHTING FUNCTION I tried several methods available as described in Hugo documentation for [Syntax Highlighting] function on my blog. My first attempt was the pre-processed server side approach using  Pygments, an external Python-based program. I installed Pygments through pip install, not realizing that Arch has it provided under its package manager called  pygmentize.