hseval.js

commands.addUserCommand(['hseval'], 'evaluate haskell expression',
  function(args) {
    util.httpGet('http://tryhaskell.org/haskell.json?method=eval&expr=' + encodeURIComponent(args.literalArg), function(res) {
      let json = JSON.parse(res.responseText);
      if (json.error) {
        liberator.echoerr('error: ' + json.error);
      } else if (json.exception) {
        liberator.echoerr('exception: ' + json.exception);
      } else {
        liberator.echo(json.result + ' :: ' + json.type);
      }
    });
  }, { literal: 0 }, true);