gnu: Add Geiser.

* gnu/packages/emacs.scm (geiser): New variable.

gnu/packages/emacs.scm

@@ -25,7 +25,8 @@ (define-module (gnu packages emacs)
   #:use-module (gnu packages ncurses)
   #:use-module (gnu packages texinfo)
   #:use-module (gnu packages gnutls)
-  #:use-module (gnu packages pkg-config))
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages guile))
 
 (define-public emacs
   (package
@@ -91,3 +92,40 @@ (define-public emacs
 extensions are distributed with GNU Emacs; others are available
 separately.")
     (license gpl3+)))
+
+
+;;;
+;;; Emacs hacking.
+;;;
+
+(define-public geiser
+  (package
+    (name "geiser")
+    (version "0.3")
+    (source (origin
+             (method url-fetch)
+             (uri (string-append "mirror://savannah/geiser/0.3/geiser-"
+                                 version ".tar.gz"))
+             (sha256
+              (base32 "1yzx0k1y5dq0m9dr3zdrxd8li0pddzblzj1ngd0spvsvvzz6v13j"))))
+    (build-system gnu-build-system)
+    (inputs `(("guile" ,guile-2.0)
+              ("emacs" ,emacs)))
+    (home-page "http://nongnu.org/geiser/")
+    (synopsis "Collection of Emacs modes for Guile and Racket hacking")
+    (description
+     "Geiser is a collection of Emacs major and minor modes that
+conspire with one or more Scheme interpreters to keep the Lisp Machine
+Spirit alive.  It draws inspiration (and a bit more) from environments
+such as Common Lisp’s Slime, Factor’s FUEL, Squeak or Emacs itself, and
+does its best to make Scheme hacking inside Emacs (even more) fun.
+
+Or, to be precise, what i consider fun.  Geiser is thus my humble
+contribution to the dynamic school of expression, and a reaction against
+what i perceive as a derailment, in modern times, of standard Scheme
+towards the static camp.  Because i prefer growing and healing to poking
+at corpses, the continuously running Scheme interpreter takes the center
+of the stage in Geiser.  A bundle of Elisp shims orchestrates the dialog
+between the Scheme interpreter, Emacs and, ultimately, the schemer,
+giving her access to live metadata.")
+    (license bsd-3)))