I decided to switch my blog to use highlightjs instead of the mixture of my own library and ColorCode. I still wanted everything to rendered statically though so I decided to use highlight.js as it already offered instructions on how to use the library from node.

I wanted to be able to specify what the language is being highligthed and pass the code thru stdin. Here's the script I came up with:

const fs = require('fs');
const hljs = require(__dirname + '/../ext/highlight.js');
const process = require('process');

const stdin = fs.readFileSync(0, 'utf-8');

console.info(hljs.highlight(process.argv[2], stdin).value);

I didn't feel like bothering with node_modules to the highlight.js library is just placed directly in the ext directory for my blog and I reference it directly from the script. The script can be invoked from the command line like so:

node highlight.js html < file.html

Where the html after the highlight.js is the language name and < file.hmtml indicates to pass the contents of file.html via stdin. The script can be invoked from C# like so:

public static string Highlight(string language, string input)
{
    using var process = new Process();
    process.StartInfo.FileName = "node.exe";
    process.StartInfo.Arguments = $"highlight.js {language}";
    process.StartInfo.RedirectStandardOutput = true;
    process.StartInfo.RedirectStandardInput = true;
    process.StartInfo.UseShellExecute = false;

    process.Start();

    using (var sw = process.StandardInput)
        sw.WriteLine(input);

    var output = process.StandardOutput.ReadToEnd();

    process.WaitForExit();

    return output;
}