#cs(module common mzscheme

;; For PLT Schemes v.200

(require 
  (lib "defmacro.ss")
  (lib "string.ss")
  (rename (lib "pretty.ss") pp pretty-print))
  
(define (command-line)
  (cons "plt" (vector->list (current-command-line-arguments)
	;	argv
		)))

 ;(define (call-with-input-string str fun)
 ;   (fun (open-input-string str)))
 ;
 ;(define (call-with-output-string fun)
 ;  (let ((outs (open-output-string)))
 ;  (fun outs)
 ;  (get-output-string outs)))

(define close-output-string get-output-string)

;
(define (filter pred lis)			
  (let rpt ((l lis))		
    (if (null? l) 
      '()
       (if (pred (car l))
	 (cons (car l) (rpt (cdr l)))
	 (rpt (cdr l))))))

(define-syntax and-let*                                                            
  (syntax-rules ()                   
		((and-let* () body ...)
		 (begin body ...))
		((and-let* ((var expr) clauses ...) body ...) 
		 (let ((var expr))
		   (if var (and-let* (clauses ...) body ...) #f)))
		((and-let* ((expr) clauses ...) body ...)
		 (if expr (and-let* (clauses ...) body ...) #f))
		((and-let* (var clauses ...) body ...)
		 (if var (and-let* (clauses ...) body ...) #f))
		))                  


(provide (all-defined)))