gnu: Add SLOCCount.

* gnu/packages/code.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu-system.am

@@ -60,6 +60,7 @@ GNU_SYSTEM_MODULES =				\
   gnu/packages/cflow.scm			\
   gnu/packages/check.scm			\
   gnu/packages/cmake.scm			\
+  gnu/packages/code.scm				\
   gnu/packages/commencement.scm			\
   gnu/packages/compression.scm			\
   gnu/packages/complexity.scm			\

gnu/packages/code.scm

@@ -0,0 +1,82 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages code)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix licenses)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages perl))
+
+;;; Tools to deal with source code: metrics, cross-references, etc.
+
+(define-public sloccount
+  (package
+    (name "sloccount")
+    (version "2.26")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://www.dwheeler.com/sloccount/sloccount-"
+                                  version ".tar.gz"))
+              (sha256
+               (base32
+                "0ayiwfjdh1946asah861ah9269s5xkc8p5fv1wnxs9znyaxs4zzs"))))
+    (build-system gnu-build-system)
+    (arguments
+     '(#:phases (modify-phases %standard-phases
+                  (delete configure)
+                  (add-before build make-dotl-files-older
+                              (lambda _
+                                ;; Make the '.l' files as old as the '.c'
+                                ;; files to avoid triggering the rule that
+                                ;; requires Flex.
+                                (define ref
+                                  (stat "README"))
+
+                                (for-each (lambda (file)
+                                            (set-file-time file ref))
+                                          (find-files "." "\\.[chl]$"))
+                                #t))
+                  (add-before install make-target-directories
+                              (lambda* (#:key outputs #:allow-other-keys)
+                                (let ((out (assoc-ref outputs "out")))
+                                  (mkdir-p (string-append out "/bin"))
+                                  (mkdir-p (string-append out
+                                                          "/share/man/man1"))
+                                  (mkdir-p (string-append out
+                                                          "/share/doc")))))
+                  (replace check
+                           (lambda _
+                             (setenv "HOME" (getcwd))
+                             (setenv "PATH"
+                                     (string-append (getcwd) ":"
+                                                    (getenv "PATH")))
+                             (zero? (system* "make" "test")))))
+
+        #:make-flags (list (string-append "PREFIX="
+                                          (assoc-ref %outputs "out")))))
+    (inputs `(("perl" ,perl)))
+    (home-page "http://www.dwheeler.com/sloccount/")
+    (synopsis "Count physical source lines of code (SLOC)")
+    (description
+     "SLOCCount is a set of the programs for counting source lines of
+code (SLOC) in large software systems.  It can automatically identify and
+measure a wide range of programming languages.  It automatically estimates the
+effort, time, and money it would take to develop the software, using the
+COCOMO model or user-provided parameters.")
+    (license gpl2+)))