gnu: Add python-sphinx-autobuild.

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

gnu/packages/sphinx.scm

@@ -1,6 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2014 David Thompson <davet@gnu.org>
-;;; Copyright © 2015, 2017, 2019 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2015, 2017, 2019, 2020 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2015, 2016, 2017 Leo Famulari <leo@famulari.name>
 ;;; Copyright © 2016 Hartmut Goebel <h.goebel@crazy-compilers.com>
 ;;; Copyright © 2016, 2017, 2018, 2019 Marius Bakke <mbakke@fastmail.com>
@@ -597,3 +597,49 @@ (define-public python-sphinx-intl
      "A utility tool that provides several features that make it easy to
 translate and to apply translation to Sphinx generated document.")
     (license license:bsd-2)))
+
+(define-public python-sphinx-autobuild
+  (package
+    (name "python-sphinx-autobuild")
+    (version "0.7.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "sphinx-autobuild" version))
+       (sha256
+        (base32
+         "0kn753dyh3b1s0h77lbk704niyqc7bamvq6v3s1f6rj6i20qyf36"))))
+    (build-system python-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         ;; See https://github.com/GaretJax/sphinx-autobuild/pull/72
+         (add-after 'unpack 'use-later-port-for
+           (lambda _
+             (substitute* "requirements.txt"
+               (("port_for==.*") "port_for\n"))
+             #t))
+         (delete 'check)
+         (add-after 'install 'check
+           (lambda* (#:key inputs outputs tests? #:allow-other-keys)
+             (when tests?
+               (add-installed-pythonpath inputs outputs)
+               (invoke "pytest" "-v"))
+             #t)))))
+    (propagated-inputs
+     `(("python-argh" ,python-argh)
+       ("python-livereload" ,python-livereload)
+       ("python-pathtools" ,python-pathtools)
+       ("python-port-for" ,python-port-for)
+       ("python-pyyaml" ,python-pyyaml)
+       ("python-tornado" ,python-tornado)
+       ("python-watchdog" ,python-watchdog)))
+    (native-inputs
+     `(("python-pytest" ,python-pytest)))
+    (home-page "https://github.com/GaretJax/sphinx-autobuild")
+    (synopsis "Rebuild Sphinx documentation when a change is detected")
+    (description
+     "This package lets you watch a Sphinx directory and rebuild the
+documentation when a change is detected.  It also includes a livereload
+enabled web server.")
+    (license license:expat)))