gnu: python-rpy2: Update to 3.0.4-1.19868a8.

* gnu/packages/statistics.scm (python-rpy2): Update to 3.0.4-1.19868a8.
[source]: Fetch from repository.
[propagated-inputs]: Add python-cffi, python-numpy, python-pandas,
python-ipython, and python-tzlocal.
[native-inputs]: Add python-pytest.
[arguments]: Set TZ variable and use pytest to run the tests.

gnu/packages/statistics.scm

@@ -57,6 +57,7 @@
   #:use-module (gnu packages icu4c)
   #:use-module (gnu packages image)
   #:use-module (gnu packages java)
+  #:use-module (gnu packages libffi)
   #:use-module (gnu packages machine-learning)
   #:use-module (gnu packages maths)
   #:use-module (gnu packages multiprecision)
@@ -5765,16 +5766,23 @@ as a boxplot function.")
     (license license:lgpl3+)))
 
 (define-public python-rpy2
+  ;; We need to take this changeset instead of the RELEASE_3_0_4 tag, because
+  ;; it fixes a regression when using ggplot 3.2.0.
+  (let ((changeset "19868a8")
+        (revision "1"))
     (package
       (name "python-rpy2")
-    (version "2.9.4")
+      (version (git-version "3.0.4" revision changeset))
       (source
        (origin
-       (method url-fetch)
+         (method hg-fetch)
-       (uri (pypi-uri "rpy2" version))
+         (uri (hg-reference
+               (url "https://bitbucket.org/rpy2/rpy2")
+               (changeset changeset)))
+         (file-name (git-file-name name version))
          (sha256
           (base32
-         "0bl1d2qhavmlrvalir9hmkjh74w21vzkvc2sg3cbb162s10zfmxy"))))
+           "1bb0wslcbj3wjvyk3jb9yyzdi6adfqh5vfgcvn22dyzxzbhcs8kk"))))
       (build-system python-build-system)
       (arguments
        '(#:modules ((ice-9 ftw)
@@ -5787,17 +5795,23 @@ as a boxplot function.")
            (replace 'check
              (lambda* (#:key outputs inputs #:allow-other-keys)
                (let ((cwd (getcwd)))
+                 (setenv "TZ" "UTC")
                  (setenv "PYTHONPATH"
                          (string-append cwd "/build/"
                                         (find (cut string-prefix? "lib" <>)
                                               (scandir (string-append cwd "/build")))
                                         ":"
                                         (getenv "PYTHONPATH"))))
-             (invoke "python" "-m" "rpy2.tests" "-v"))))))
+               (invoke "pytest" "-v" "rpy/tests/"))))))
       (propagated-inputs
-     `(("python-six" ,python-six)
+       `(("python-cffi" ,python-cffi)
+         ("python-six" ,python-six)
          ("python-jinja2" ,python-jinja2)
-       ("python-pytz" ,python-pytz)))
+         ("python-numpy" ,python-numpy)
+         ("python-pandas" ,python-pandas)
+         ("python-pytz" ,python-pytz)
+         ("python-ipython" ,python-ipython)
+         ("python-tzlocal" ,python-tzlocal)))
       (inputs
        `(("readline" ,readline)
          ("icu4c" ,icu4c)
@@ -5810,7 +5824,8 @@ as a boxplot function.")
          ("r-dbplyr" ,r-dbplyr)
          ("python-numpy" ,python-numpy)))
       (native-inputs
-     `(("zlib" ,zlib)))
+       `(("zlib" ,zlib)
+         ("python-pytest" ,python-pytest)))
       (home-page "https://rpy2.bitbucket.io/")
       (synopsis "Python interface to the R language")
       (description "rpy2 is a redesign and rewrite of rpy.  It is providing a
@@ -5820,7 +5835,7 @@ functions.")
       ;; Any of these licenses can be picked for the R interface.  The whole
       ;; project is released under GPLv2+ according to the license declaration
       ;; in "setup.py".
-    (license (list license:mpl2.0 license:gpl2+ license:lgpl2.1+))))
+      (license (list license:mpl2.0 license:gpl2+ license:lgpl2.1+)))))
 
 (define-public java-jdistlib
   (package