gnu: Add python-sphinx-panels.

* gnu/packages/sphinx.scm (python-sphinx-panels): New variable.

gnu/packages/sphinx.scm

@@ -300,6 +300,38 @@ (define-public python-sphinxcontrib-newsfeed
     (home-page "https://bitbucket.org/prometheus/sphinxcontrib-newsfeed")
     (license license:bsd-2)))
 
+(define-public python-sphinx-panels
+  (package
+    (name "python-sphinx-panels")
+    (version "0.6.0")
+    (source
+      (origin
+        ;; Tests not included in the pypi release.
+        (method git-fetch)
+        (uri (git-reference
+               (url "https://github.com/executablebooks/sphinx-panels")
+               (commit (string-append "v" version))))
+        (file-name (git-file-name name version))
+        (sha256
+         (base32 "1ivqz6yv96a2jp59kylg1gbkrmzq6zwilppz3ij0zrkjn25zb97k"))))
+    (build-system python-build-system)
+    (arguments
+     '(#:phases
+       (modify-phases %standard-phases
+         (replace 'check
+           (lambda* (#:key tests? #:allow-other-keys)
+             (when tests?
+               (invoke "pytest")))))))
+    (propagated-inputs (list python-docutils python-sphinx))
+    (native-inputs
+     (list python-pytest
+           python-pytest-regressions))
+    (home-page "https://github.com/executablebooks/sphinx-panels")
+    (synopsis "Sphinx extension for creating panels in a grid layout")
+    (description
+     "This package provides a sphinx extension for creating panels in a grid layout.")
+    (license license:expat)))
+
 (define-public python-sphinxcontrib-programoutput
   (package
     (name "python-sphinxcontrib-programoutput")