(define (makefile-fontifier string)
   (with-input-from-string string
      (lambda ()
	 (read/rp (regular-grammar ()
		     ((: #\# (+ all))
		      ;; makefile comment
		      (let ((cmt (the-string)))
			 (cons (it cmt) (ignore))))
		     ((bol (: (+ (out " \t\n:")) #\:))
		      ;; target
		      (let ((prompt (the-string)))
			 (cons (bold prompt) (ignore))))
		     ((bol (: (+ alpha) #\=))
		      ;; variable definitions
		      (let* ((len (- (the-length) 1))
			     (var (the-substring 0 len)))
			 (cons (list (color :fg "#bb0000" (bold var)) "=")
			       (ignore))))
		     ((+ (out " \t\n:=$"))
		      ;; plain strings
		      (let ((str (the-string)))
			 (cons str (ignore))))
		     ((: #\$ #\( (+ (out " )\n")) #\))
		      ;; variable references
		      (let ((str (the-string))
			    (var (the-substring 2 (- (the-length) 1))))
			 (cons (underline str) (ignore))))
		     ((+ (in " \t\n:"))
		      ;; separators
		      (let ((nl (the-string)))
			 (cons nl (ignore))))
		     (else
		      ;; default
		      (let ((c (the-failure)))
			 (if (eof-object? c)
			     '()
			     (skribe-error 'makefile "Unexpected char" c)))))
		  (current-input-port)))))

(define makefile
   (language :name "Makefile"
	     :fontifier makefile-fontifier))
	     
(frame :width 100. 
       (prog (source :language makefile [
SKRIBE=skribe

all: demo.html demo.man

demo.html: demo.skb
        $(SKRIBE) demo.skb -o demo.html

demo.man: demo.skb
        $(SKRIBE) demo.skb -o demo.man
])))