gnu: Move guile-charting to (gnu packages plotutils).

This removes the dependency from (gnu packages guile)
to (gnu packages gtk), which potentially reduces the memory/IO/CPU
footprint given that 'guile' is used during bootstrap.

* gnu/packages/guile.scm (guile-charting): Move to...
* gnu/packages/plotutils.scm (guile-charting): ... here.

gnu/packages/guile.scm

@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -34,7 +34,6 @@
   #:use-module (gnu packages ncurses)
   #:use-module (gnu packages ed)
   #:use-module (gnu packages which)
-  #:use-module (gnu packages gtk)
   #:use-module (guix packages)
   #:use-module (guix download)
   #:use-module (guix build-system gnu)
@@ -368,33 +367,4 @@ http:://json.org specification.  These are the main features:
 - Allows JSON pretty printing.")
     (license lgpl3+)))
 
-(define-public guile-charting
-  (package
-    (name "guile-charting")
-    (version "0.2.0")
-    (source (origin
-              (method url-fetch)
-              (uri (string-append "http://wingolog.org/pub/guile-charting/"
-                                  "guile-charting-" version ".tar.gz"))
-              (sha256
-               (base32
-                "0w5qiyv9v0ip5li22x762bm48g8xnw281w66iyw094zdw611pb2m"))
-              (modules '((guix build utils)))
-              (snippet
-               '(begin
-                  ;; Use the standard location for modules.
-                  (substitute* "Makefile.in"
-                    (("godir = .*$")
-                     "godir = $(moddir)\n"))))))
-    (build-system gnu-build-system)
-    (native-inputs `(("pkg-config" ,pkg-config)))
-    (inputs `(("guile" ,guile-2.0)))
-    (propagated-inputs `(("guile-cairo" ,guile-cairo)))
-    (home-page "http://wingolog.org/software/guile-charting/")
-    (synopsis "Create charts and graphs in Guile")
-    (description
-     "Guile-Charting is a Guile Scheme library to create bar charts and graphs
-using the Cairo drawing library.")
-    (license lgpl2.1+)))
-
 ;;; guile.scm ends here

gnu/packages/plotutils.scm

@@ -23,6 +23,9 @@
   #:use-module (guix build-system gnu)
   #:use-module (gnu packages xorg)
   #:use-module (gnu packages image)
+  #:use-module (gnu packages guile)
+  #:use-module (gnu packages gtk)
+  #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages))
 
 (define-public plotutils
@@ -62,3 +65,32 @@ graphics in many file formats.  It also has support for 2D vector graphics
 animations.  The package also contains command-line programs for plotting
 scientific data.")
     (license gpl2+)))
+
+(define-public guile-charting
+  (package
+    (name "guile-charting")
+    (version "0.2.0")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://wingolog.org/pub/guile-charting/"
+                                  "guile-charting-" version ".tar.gz"))
+              (sha256
+               (base32
+                "0w5qiyv9v0ip5li22x762bm48g8xnw281w66iyw094zdw611pb2m"))
+              (modules '((guix build utils)))
+              (snippet
+               '(begin
+                  ;; Use the standard location for modules.
+                  (substitute* "Makefile.in"
+                    (("godir = .*$")
+                     "godir = $(moddir)\n"))))))
+    (build-system gnu-build-system)
+    (native-inputs `(("pkg-config" ,pkg-config)))
+    (inputs `(("guile" ,guile-2.0)))
+    (propagated-inputs `(("guile-cairo" ,guile-cairo)))
+    (home-page "http://wingolog.org/software/guile-charting/")
+    (synopsis "Create charts and graphs in Guile")
+    (description
+     "Guile-Charting is a Guile Scheme library to create bar charts and graphs
+using the Cairo drawing library.")
+    (license lgpl2.1+)))