Finish integrated command-line help system.

brmsaptool.scm

@@ -46,7 +46,10 @@
 
 (command-line
  print-help
- (-h "This help" () (print "help") (print-help) (print "done") (exit 0))
+ (-h "This help" ()
+     (print "Command-line options:")
+     (print-help)
+     (exit 0))
  (-a "One-argument" (x) (print "Argument x " x))
  (-b "Two arguments" (x y) (print "Arguments " x y))
  (-c "Argument lambda" (lambda (x) (print "Lambda x " x))))

command-line.scm

@@ -100,10 +100,18 @@
 				  descrs))))
      (let loop ((descrs descrs))
        (when (not (null? descrs))
-	 (let ((desc (car descrs)))
-	   (print (car desc)
-		  (cadr desc)
-		  (caddr desc))
+	 (let* ((desc (car descrs))
+		(opt (car desc))
+		(args (cadr desc))
+		(help (caddr desc)))
+	   (print "  "
+		  opt
+		  (make-string (- owidth (string-length opt)) #\space)
+		  " "
+		  args
+		  (make-string (- awidth (string-length args)) #\space)
+		  "  "
+		  help)
 	   (loop (cdr descrs)))))))
 
  ;; Syntax for expanding various types of options.