{
  config,
  lib,
  pkgs,
  this,
  ...
}:
{
  config = {
    hm = {
      manual = {
        manpages.enable = this.isHeadful;
        html.enable = false;
        json.enable = false;
      };

      # Fixes a wierd issue with `direnv` and an unbound value.
      home.sessionVariables.MANPATH = "";
    };

    documentation = {
      enable = this.isHeadful;
      dev.enable = true;
      doc.enable = false;
      info.enable = true;
      nixos.enable = true;

      man.man-db.manualPages =
        (pkgs.buildEnv {
          name = "man-paths";
          paths = config.environment.systemPackages ++ config.hm.home.packages;
          pathsToLink = [ "/share/man" ];
          extraOutputsToInstall = [ "man" ];
          ignoreCollisions = true;
        }).overrideAttrs
          (_: _: { __contentAddressed = true; });
    };

    environment.variables = {
      MANOPT = "--no-hyphenation";
      MANPAGER = "${lib.getExe pkgs.less} -+F";
    };
  };
}