commonlisp.it

Homepage for the European Lisp Symposium

New projects: asdf-dependency-graph — A minimal wrapper around `dot` available at least on Linux systems to generate dependency-graphs....

Emacs Lisp Static Analyzer. Contribute to emacs-elsa/Elsa development by creating an account on GitHub.

While SLIME is most of the time able to indent Common Lisp correctly, it will sometimes trip on custom forms. Let us see how we can customize indentation. In the process of writing my PostgreSQL client in Common Lisp, I wrote a READ-MESSAGE-CASE macro which reads a message from a stream and execute code depending on the type of the message: (defmacro read-message-case ((message stream) &rest forms) `(let ((,message (read-message ,stream))) (case (car ,message) (:error-response (backend-error (cdr ,message))) (:notice-response nil) ,@forms (t (error 'unexpected-message :message ,message))))) This macro is quite useful: all message loops can use it to automatically handle error responses, notices, and signal unexpected messages.