Sam Hooke

Hugo: Migrating from Pygments to Chroma

These notes cover how this website switched from Pygments to Chroma for code syntax highlighting.

Pygments §

This website is generated by Hugo. Prior to Hugo v0.28, Pygments was the default syntax highligher.

Enabling use of Pygments was a matter of adding this to your hugo.toml:

hugo.toml (Pygments) §
pygmentsCodeFences = true
pygmentsStyle = "monokai"

This enabled the monokai theme for syntax higlighting.

Pygments themes §

A couple dozen other supported styles were available.1

Chroma §

In Hugo v0.28 (released 2017-09-25), the default syntax highlighter changed from Pygments to Chroma. For a couple of years both were supported, but in Hugo v0.60 (released 2019-11-10), support for Pygments was removed.

Enabling use of Chroma can be done by replacing the Pygments configuration with the following:

hugo.toml (Chroma) §
    anchorLineNos = false
    codeFences = true
    guessSyntax = false
    hl_Lines = ''
    hl_inline = false
    lineAnchors = ''
    lineNoStart = 1
    lineNos = false
    lineNumbersInTable = true
    noClasses = true
    noHl = false
    style = 'monokai'
    tabWidth = 4

Again, this enables the monokai them for syntax higlighting.

Chroma themes §

Here are galleries of all Chroma themes:2

  1. Here is the full list of Pygments themes: autumn, borland, bw, colorful, default, emacs, friendly, fruity, manni, monokai, murphy, native, pastie, perldoc, tango, trac, vim, vs↩︎

  2. Here is the full list of Chroma themes: abap, algol, algol_nu, api, arduino, autumn, average, base16-snazzy, borland, bw, catppuccin-frappe, catppuccin-latte, catppuccin-macchiato, catppuccin-mocha, colorful, compat, doom-one, doom-one2, dracula, emacs, friendly, fruity, github-dark, github, gruvbox-light, gruvbox, hr_high_contrast, hrdark, igor, lovelace, manni, modus-operandi, modus-vivendi, monokai, monokailight, murphy, native, nord, onedark, onesenterprise, paraiso-dark, paraiso-light, pastie, perldoc, pygments, rainbow_dash, rose-pine-dawn, rose-pine-moon, rose-pine, rrt, solarized-dark, solarized-dark256, solarized-light, swapoff, tango, trac, vim, vs, vulcan, witchhazel, xcode-dark, xcode↩︎