New procedure-header procedure.

[gacela.git] / src / utils.scm

diff --git a/src/utils.scm b/src/utils.scm
index 17d1bbfb5d35d098f05472533f4ac930aabb2782..f2b339aa18ebbbfe365490ec59037f12dd3bb697 100644 (file)
--- a/src/utils.scm
+++ b/src/utils.scm
@@ -16,11 +16,12 @@
 
 
 (define-module (gacela utils)
-  #:export (use-cache-with))
+  #:use-module (ice-9 session)
+  #:export (use-cache-with
+           procedure-header))
 
 
 ;;; Cache for procedures
-
 (define (use-cache-with proc)
   (let ((cache (make-weak-value-hash-table)))
     (lambda (. param)
@@ -31,3 +32,11 @@
               (set! res (apply proc param))
               (hash-set! cache key res)
               res))))))
+
+
+;;; Retrive header definition of a procedure
+ (define (procedure-header proc)
+   (let* ((args (procedure-arguments proc))
+        (name (procedure-name proc))
+        (required (cdar args)))
+     (cons name required)))