[PATCH] gnu: Add emacs-ag

[Christopher Baines]

* gnu/packages/emacs.scm (emacs-ag): New variable.
---
 gnu/packages/emacs.scm | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/gnu/packages/emacs.scm b/gnu/packages/emacs.scm
index 50cea7685..62b8dcc46 100644
--- a/gnu/packages/emacs.scm
+++ b/gnu/packages/emacs.scm
@@ -46,6 +46,7 @@
   #:use-module (guix build-system glib-or-gtk)
   #:use-module (guix build-system trivial)
   #:use-module (gnu packages)
+  #:use-module (gnu packages code)
   #:use-module (gnu packages guile)
   #:use-module (gnu packages gtk)
   #:use-module (gnu packages gnome)
@@ -1066,6 +1067,43 @@ like.  It can be linked with various Emacs mail clients 
(Message and Mail
 mode, Rmail, Gnus, MH-E, and VM).  BBDB is fully customizable.")
     (license license:gpl3+)))
 
+(define-public emacs-ag
+  (package
+    (name "emacs-ag")
+    (version "0.47")
+    (source (origin
+             (method url-fetch)
+             (uri (string-append
+                   "https://github.com/Wilfred/ag.el/archive/";
+                   version ".tar.gz"))
+             (file-name (string-append name "-" version ".tar.gz"))
+             (sha256
+              (base32
+               "1rlmp6wnyhqfg86dbz17r914msp58favn4kd4yrdwyia265a4lar"))))
+    (build-system emacs-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-before 'install 'configure
+                     (lambda* (#:key inputs #:allow-other-keys)
+                       (emacs-substitute-variables "ag.el"
+                         ("ag-executable" (string-append
+                                           (assoc-ref inputs 
"the-silver-searcher")
+                                           "/bin/ag")))
+                       #t)))))
+    (propagated-inputs
+     `(("the-silver-searcher" ,the-silver-searcher)
+       ("dash" ,emacs-dash)
+       ("s" ,emacs-s)))
+    (home-page "https://github.com/Wilfred/ag.el";)
+    (synopsis "Front-end for ag (the-silver-searcher) for Emacs")
+    (description "This package provides the ability to use the silver
+searcher, a code searching tool, sometimes abbreviated to @code{ag}.  Features
+include version control system awareness, use of Perl compatible regular
+expressions, editing the search results directly and searching file names
+rather than the contents of files.")
+    (license license:gpl3+)))
+
 (define-public emacs-async
   (package
     (name "emacs-async")
-- 
2.11.0