gnu: Add cl-eventbus.

* gnu/packages/lisp-xyz.scm (cl-eventbus, ecl-eventbus, sbcl-eventbus): New
variables.

Signed-off-by: Christopher Baines <mail@cbaines.net>

gnu/packages/lisp-xyz.scm

@@ -14353,6 +14353,34 @@ with a complex event filtering system.")
 (define-public ecl-deeds
   (sbcl-package->ecl-package sbcl-deeds))
 
+(define-public sbcl-eventbus
+  (let ((commit "92c1fa3846ba0e3cc9e6d7605d765379c8658d84")
+        (revision "1"))
+    (package
+      (name "sbcl-eventbus")
+      (version (git-version "0.1.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/noloop/eventbus")
+               (commit commit)))
+         (file-name (git-file-name "eventbus" version))
+         (sha256
+          (base32 "0slqx3zq6sbz3rg4g79j8y25sx4405y6ff3x6l5v8v4v42m1s0p2"))))
+      (build-system asdf-build-system/sbcl)
+      (native-inputs (list sbcl-simplet))
+      (home-page "https://github.com/noloop/eventbus")
+      (synopsis "Event bus implementation in Common Lisp")
+      (description "This package provides a Common Lisp system implementing event bus.")
+      (license license:gpl3))))
+
+(define-public ecl-eventbus
+  (sbcl-package->ecl-package sbcl-eventbus))
+
+(define-public cl-eventbus
+  (sbcl-package->cl-source-package sbcl-eventbus))
+
 (define-public sbcl-make-hash
   ;; no tagged branch
   (let ((revision "1")