commander-s/scheme/process.scm

(define (list-of-processes? thing)
  (and (proper-list? thing)
       (every process-info? thing)))

(define (print-processes processes)
  (map (lambda (pi)
	 (apply format 
		(append
		 (list #f 
		       "~A ~A ~A ~A '~A ~A'~%")
		 (map (lambda (s) (s pi))
		      (list process-info-pid 
			    process-info-ppid
			    process-info-real-uid 
			    process-info-%cpu
			    process-info-executable
			    process-info-command-line)))))
       processes))

(define (pps-receiver message)
  (debug-message "pps-receiver " message)
  (cond
   ((next-command-message? message)
    (pps))
   ((init-with-result-message? message)
    (init-with-result-message-result message))
   ((print-message? message)
    (let ((processes (message-result-object message)))
      (make-print-object 1 1 (print-processes processes)
			 '() '())))
   ((key-pressed-message? message)
    (pps))
   ((restore-message? message)
    (values))
   ((selection-message? message)
    "'()")))

(register-plugin! 
 (make-plugin "ps" pps-receiver list-of-processes?))