1 files changed, 9 insertions, 0 deletions
diff --git a/f.scm b/f.scm
index ffac4df..2f9cb83 100644
--- a/f.scm
+++ b/f.scm
@@ -33,6 +33,7 @@
             delete
             traverse
             copy
+            extension
             no-extension
             replace-extension)
   #:re-export (chown
@@ -173,6 +174,14 @@ appending a #t at the end."))))))
 by appending a #t at the end."))))
       (copy-file src dest)))
 
+(define (extension file)
+  "Return extension for FILE."
+  (let ((ext (string-match ".+\\.(.*)" (basename file))))
+    (cond
+     ((string-null? file) #f)
+     (ext (regexp-substitute #f ext 1))
+     (else ""))))
+
 (define (no-extension file)
   "Return FILE path without extension."
   (let ((without-ext (string-match "(.+)\\..*" (basename file))))