Merge branch 'master' into staging

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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 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 jupyter)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix git-download)
+  #:use-module (guix build-system cmake)
+  #:use-module (guix build-system python)
+  #:use-module (gnu packages check)
+  #:use-module (gnu packages cpp)
+  #:use-module (gnu packages linux)
+  #:use-module (gnu packages networking)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages python)
+  #:use-module (gnu packages python-xyz)
+  #:use-module (gnu packages serialization)
+  #:use-module (gnu packages time)
+  #:use-module (gnu packages tls))
+
+(define-public python-jupyter-protocol
+  (package
+    (name "python-jupyter-protocol")
+    (version "0.1.1")
+    (source (origin
+              (method url-fetch)
+              (uri (pypi-uri "jupyter_protocol" version))
+              (sha256
+               (base32
+                "1bk3as5yw9y5nmq6l15nr46aby34phmvsx9kxgqnm5pd5q2b5h57"))))
+    (build-system python-build-system)
+    (propagated-inputs
+     `(("python-dateutil" ,python-dateutil)
+       ("python-jupyter-core" ,python-jupyter-core)
+       ("python-pyzmq" ,python-pyzmq)
+       ("python-traitlets" ,python-traitlets)))
+    (native-inputs
+     `(("python-ipykernel" ,python-ipykernel)
+       ("python-ipython" ,python-ipython)
+       ("python-mock" ,python-mock)
+       ("python-pytest" ,python-pytest)))
+    (home-page "https://jupyter.org")
+    (synopsis "Jupyter protocol implementation")
+    (description
+     "This Python library is an experimental implementation of the
+@uref{https://jupyter-client.readthedocs.io/en/latest/messaging.html, Jupyter
+protocol} to be used by both clients and kernels.")
+    (license license:bsd-3)
+    (properties '((upstream-name . "jupyter_protocol")))))
+
+(define-public python-jupyter-kernel-mgmt
+  (package
+    (name "python-jupyter-kernel-mgmt")
+    (version "0.4.0")
+    (source (origin
+              (method url-fetch)
+              (uri (pypi-uri "jupyter_kernel_mgmt" version))
+              (sha256
+               (base32
+                "0i7a78dn89ca8h0a42giyxwcmk6y4wrdr7q8h2ax9vybb84c795q"))))
+    (build-system python-build-system)
+    (propagated-inputs
+     `(("python-dateutil" ,python-dateutil)
+       ("python-entrypoints" ,python-entrypoints)
+       ("python-jupyter-core" ,python-jupyter-core)
+       ("python-jupyter-protocol" ,python-jupyter-protocol)
+       ("python-pyzmq" ,python-pyzmq)
+       ("python-traitlets" ,python-traitlets)))
+    (native-inputs
+     `(("python-ipykernel" ,python-ipykernel)
+       ("python-ipython" ,python-ipython)
+       ("python-mock" ,python-mock)
+       ("python-pytest" ,python-pytest)))
+    (home-page "https://jupyter.org")
+    (synopsis "Discover, launch, and communicate with Jupyter kernels")
+    (description
+     "This package is an experimental refactoring of the machinery for
+launching and using Jupyter kernels.")
+    (license license:bsd-3)
+    (properties '((upstream-name . "jupyter_kernel_mgmt")))))
+
+(define-public python-jupyter-kernel-test
+  (package
+    (name "python-jupyter-kernel-test")
+    (version "0.3")
+    (home-page "https://github.com/jupyter/jupyter_kernel_test")
+    (source (origin
+              ;; PyPI has a ".whl" file but not a proper source release.
+              ;; Thus, fetch code from Git.
+              (method git-fetch)
+              (uri (git-reference (url home-page) (commit version)))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "00iy74i4i8is6axb9vlsm0b9wxkvyyxnbl8r0i4gaj3xd788jm83"))))
+    (build-system python-build-system)
+    (arguments
+     ;; The repo doesn't contain a "setup.py" file so install files manually.
+     '(#:phases (modify-phases %standard-phases
+                  (delete 'build)
+                  (delete 'check)
+                  (replace 'install
+                    (lambda* (#:key inputs outputs #:allow-other-keys)
+                      (let* ((out (assoc-ref outputs "out"))
+                             (version ((@@ (guix build python-build-system)
+                                           get-python-version)
+                                       (assoc-ref inputs "python")))
+                             (pydir (string-append out "/lib/python"
+                                                   version "/site-packages/"
+                                                   "jupyter_kernel_test")))
+                        (for-each (lambda (file)
+                                    (install-file file pydir))
+                                  (find-files "jupyter_kernel_test"
+                                              "\\.py$"))
+                        #t))))))
+    (propagated-inputs
+     `(("python-jupyter-kernel-mgmt" ,python-jupyter-kernel-mgmt)
+       ("python-jupyter-protocol" ,python-jupyter-protocol)
+       ("python-jsonschema" ,python-jsonschema)))
+    (synopsis "Test Jupyter kernels")
+    (description
+     "@code{jupyter_kernel_test} is a tool for testing Jupyter kernels.  It
+tests kernels for successful code execution and conformance with the
+@uref{https://jupyter-client.readthedocs.io/en/latest/messaging.html, Jupyter
+Messaging Protocol}.")
+    (license license:bsd-3)))
+
+(define-public xeus
+  (package
+    (name "xeus")
+    (version "0.23.2")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/QuantStack/xeus.git")
+                    (commit version)))
+              (sha256
+               (base32
+                "1m1b6z1538r7mv2ggn7bdbd9570ja7cadplq64zl8rgl2c8vdi2a"))
+              (file-name (git-file-name name version))))
+    (build-system cmake-build-system)
+    (arguments
+     '(#:configure-flags '("-DBUILD_STATIC_LIBS=OFF"
+                           "-DDISABLE_ARCH_NATIVE=ON" ;no '-march=native'
+                           "-DBUILD_TESTING=ON")))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)
+
+       ;; The following inputs are used by the test suite.
+       ("googletest" ,googletest)
+       ("python-pytest" ,python-pytest)
+       ("python" ,python-3)
+       ("python-jupyter-kernel-test" ,python-jupyter-kernel-test)
+       ("python-jupyter-client" ,python-jupyter-client)))
+    (inputs
+     `(("xtl" ,xtl)
+       ("nlohmann-json-cpp" ,nlohmann-json-cpp)
+       ("cppzmq" ,cppzmq)
+       ("zeromq" ,zeromq)
+       ("openssl" ,openssl)
+       ("util-linux" ,util-linux)))               ;libuuid
+    (home-page "https://quantstack.net/xeus")
+    (synopsis "C++ implementation of the Jupyter Kernel protocol")
+    (description
+     "@code{xeus} is a library meant to facilitate the implementation of
+kernels for Jupyter.  It takes the burden of implementing the Jupyter Kernel
+protocol so developers can focus on implementing the interpreter part of the
+kernel.
+
+Several Jupyter kernels are built upon @code{xeus}, such as @code{xeus-cling},
+a kernel for the C++ programming language, and @code{xeus-python}, an
+alternative Python kernel for Jupyter.")
+    (license license:bsd-3)))