colmena/manual/colorized-help.nix

{ lib, stdenv, runCommand, colmena, ansi2html }:

with builtins;

let
  subcommands = [
    null
    "apply"
  ]
  ++ lib.optional stdenv.isLinux "apply-local"
  ++ [
    "build"
    "upload-keys"
    "eval"
    "exec"
    "nix-info"
  ];
  renderHelp = subcommand: let
    fullCommand = if subcommand == null then "colmena" else "colmena ${subcommand}";
  in ''
    (
        echo '## `${fullCommand}`'
        echo -n '<pre><div class="hljs">'
        TERM=xterm-256color CLICOLOR_FORCE=1 ${fullCommand} --help | ansi2html -p
        echo '</div></pre>'
    )>>$out
  '';
in runCommand "colmena-colorized-help" {
  nativeBuildInputs = [ colmena ansi2html ];
} (''
  ansi2html -H > $out
'' + concatStringsSep "\n" (map renderHelp subcommands))