gnu: Add emacs-frecency.

* gnu/packages/emacs-xyz.scm (emacs-frecency): New variable.

gnu/packages/emacs-xyz.scm

@@ -10135,6 +10135,32 @@ outline-mode), so there is no such thing like an outshine mode, only
 @code{outline-minor-mode} with outshine extensions loaded.")
     (license license:gpl3+)))
 
+(define-public emacs-frecency
+  (let ((commit "31ef9ff4af1a4fed3dcc24ea74037feea8795c87")
+        (version "0.1-pre")
+        (revision "1"))
+    (package
+      (name "emacs-frecency")
+      (version (git-version version revision commit))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url "https://github.com/alphapapa/frecency.el")
+                      (commit commit)))
+                (sha256
+                 (base32
+                  "051aihjdg3x22svaxhwylpi8i6s2x9j8syvsj1jgilgjjdy15l6j"))
+                (file-name (git-file-name name version))))
+      (build-system emacs-build-system)
+      (propagated-inputs
+       `(("emacs-a" ,emacs-a)
+         ("emacs-dash" ,emacs-dash)))
+      (home-page "https://github.com/alphapapa/frecency.el")
+      (synopsis "Sort items by frequency and recency of access")
+      (description "This package provides a way of sorting items via
+a heuristic based on frequency and recency.")
+      (license license:gpl3+))))
+
 (define-public emacs-parsebib
   (package
     (name "emacs-parsebib")