Codeblock line numbers

What is the proper way to include line numbers in code blocks?

Usually a post-markdown process handles syntax highlighting. A few examples:

Syntax highlighters often have an option to include line numbers.

Can the following be parsed readily to produce html ready for line numbers in post-processing js library like highlight.js?:

    # line 1
    # line 2 (to be highlighted)

Duplicate of: Code Blocks Extension for filenames and line numbers

Thanks for the heads up @chrisalley :thumbsup: