1 files changed, 24 insertions, 2 deletions
diff --git a/bs/core.scm b/bs/core.scm
index 61ee8cc..943e586 100644
--- a/bs/core.scm
+++ b/bs/core.scm
@@ -3,12 +3,17 @@
   #:use-module ((system vm program))
   #:use-module ((ice-9 rdelim) #:select (read-line))
   #:use-module (srfi srfi-1)
-  #:export (fmt printf pr prn rest last butlast
+  #:export (fmt printf pr prn
+                first ffirst rest last butlast
                 true? false? some? empty?
                 -> ->> fn /. curry comp
                 repeat for seq turn
+                range ..
                 inc dec member? contains?
-                comment get-source* get-source source))
+                comment
+                ;; obsolete, use (ice-9 session) instead
+                ;; get-source* get-source source
+                ))
 
 (define (flip f)           (lambda (x y) (f y x)))
 (define (curry f a)        (lambda (b) (apply f (cons a (list b)))))
@@ -54,6 +59,9 @@
 (define (empty? a)
   (equal? a '()))
 
+(define (first a)
+  (car a))
+
 (define (ffirst a)
   (first (first a)))
 
@@ -148,6 +156,11 @@
     [(_ (binding value) body ...)
      (when binding body ...)]))
 
+(define (range min max step)
+  (if (< min max)
+      (cons min (range (+ min step) max step))
+      '()))
+
 ;; range operator from http://www.mattknox.com/code.html
 (define (.. l h . s)
   (let* ((step (if (null? s) 1 (car s))))
@@ -155,6 +168,13 @@
         (range l h step)
         (reverse (range h l step)))))
 
+(define (! n)
+  (define (fact n a)
+    (if (< n 2)
+        a
+        (fact (- n 1) (* a n))))
+  (fact n 1))
+
 
 ;; source utils
 
@@ -163,6 +183,8 @@
    ((zero? n) port)
    (else (read-line port) (skip-lines port (1- n)))))
 
+;; NOTE: this source-lookup code might be obsolete, see (ice-9 session)
+
 (define (get-source* source pname)
   (let* ([file (source:file source)]
          [filename (any (fn (x)