How can I do web programming with Lisp or Scheme?

Question

I usually write web apps in PHP, Ruby or Perl. I am starting the study of Scheme and I want to try some web project with this language. But I can\'t find what is the best enviro

Answer 1

Let's see what can be done with Common Lisp.

The state of the Common Lisp ecosystem (2015) and the Awesome Common Lisp list show us a couple of modern frameworks (Caveman, Lucerne, all built on the new Clack web application server, an interface for Hunchentoot and other servers). Let's discuss with our own findings.

update 2019: there's a new tutorial on the Common Lisp Cookbook: https://lispcookbook.github.io/cl-cookbook/web.html It covers routing, template engines, building self-contained binaries, deployment, etc.

update: a bit later, I found out Snooze, by the creator of Sly or Emacs' Yasnippet, and had a much better impression than say Caveman. Declaring endpoints is just like declaring functions, so some things that were tedious in Caveman are obvious in Snooze, like accessing the url parameters. I don't have much experience with it but I recommend checking it out.

update june 2018: also don't miss the ongoing rewrite of Weblocks, it's going to be huge ! :D http://40ants.com/weblocks/quickstart.html Weblocks allows to build dynamic webapps, without a line of Javascript, without separating the back and front. It is components-based, like React but server-side. It's very alpha as of writing (june 2018), but in progress, and it's working, I have a couple simple web apps working.

A simple way of get the request parameters (something like: get-get #key, get-post #key, get-cookie #key).

I found easier the Lucerne way, it iss as simple as a with-params macro (real world example):

@route app (:post "/tweet")
(defview tweet ()
  (if (lucerne-auth:logged-in-p)
      (let ((user (current-user)))
        (with-params (tweet)
          (utweet.models:tweet user tweet))
        (redirect "/"))
      (render-template (+index+)
                       :error "You are not logged in.")))

Caveman's way has been less clear to me.

Mysql access

Caveman advertises database integration (with Fukamachi's Datafly and sxql).

You can just use clsql or the Mito ORM: https://lispcookbook.github.io/cl-cookbook/databases.html

HTML Form generators, processing, validators, etc.

I don't know if there are form generators out there. edit: there are: cl-forms and formlets, or again 1forms, working with Caveman2.

Caveman does not have one (issue raised in 2011).

Helpers for filter user input data (something like htmlentities, escape variables for put in queries, etc).

Ratify is an input validation library, not integrated into a framework though.

FLOSS and GNU/Linux friendly: ✓

Other web stuff

Speaking about web, there are other nice libraries in CL land:

• web servers: Woo is a fast HTTP server, faster than Nodejs (beware of charts…), wookie is an async http server,
• Dexador is an HTTP client
• Plump, lquery and CLSS make it easy to parse html and query the DOM.
• cl-bootstrap offers twitter-bootstrap shortcuts for the cl-who templating engine (which kind of replaces Jade/Pug, even though we have usual templates too).

Ajax in Lisp

(remember, with Weblocks, see above, we might not need those)

With ParenScript, we can write JavaScript in Common Lisp, without living our usual workflow, and we can thus use the fetch web API to write Ajax calls.