gnu: Add presentty.

* gnu/packages/presentation.scm (presentty): New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Register it.

gnu/local.mk

@@ -435,6 +435,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/pth.scm				\
   %D%/packages/pulseaudio.scm			\
   %D%/packages/pumpio.scm			\
+  %D%/packages/presentation.scm		\
   %D%/packages/pretty-print.scm			\
   %D%/packages/protobuf.scm			\
   %D%/packages/pure.scm				\

gnu/packages/presentation.scm

@@ -0,0 +1,90 @@
+;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
+;;;
+;;; 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 presentation)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix download)
+  #:use-module (guix packages)
+  #:use-module (guix utils)
+  #:use-module (guix build-system python)
+  #:use-module (gnu packages figlet)
+  #:use-module (gnu packages games)
+  #:use-module (gnu packages image)
+  #:use-module (gnu packages python)
+  #:use-module (gnu packages python-xyz))
+
+(define-public presentty
+  (package
+    (name "presentty")
+    (version "0.2.1")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (pypi-uri "presentty" version))
+        (sha256
+         (base32
+          "1qpy992hyg1amjl0acic3agj20spcpv5m0ncg1283mmxs8cs3xy9"))
+        (patches
+          (list
+            (origin
+              (method url-fetch)
+              (uri "https://sources.debian.org/data/main/p/presentty/0.2.1-1/debian/patches/presentty-python3.patch")
+              (sha256
+               (base32
+                "03d3ylh1z99g4dqj7aka60spagnwss9mbacd7jbpk1gazflnssz1")))))))
+    (build-system python-build-system)
+    (arguments
+     `(#:tests? #f ; Test suite hasn't withstood the test of time.
+       #:phases
+       (modify-phases %standard-phases
+         (replace 'wrap
+           (lambda* (#:key python inputs outputs #:allow-other-keys)
+             (let* ((out (assoc-ref outputs "out"))
+                    (bin (string-append out "/bin/"))
+                    (python (assoc-ref inputs "python")))
+               (for-each
+                 (lambda (program)
+                   (wrap-program (string-append bin program)
+                     `("PATH" ":" prefix (,(dirname (which "cowsay"))
+                                          ,(dirname (which "figlet"))
+                                          ,(dirname (which "jp2a"))))
+                     `("PYTHONPATH" prefix
+                       ,(cons (string-append out "/lib/python"
+                                             (python-version python)
+                                             "/site-packages")
+                              (search-path-as-string->list
+                                (or (getenv "PYTHONPATH") ""))))))
+                 '("presentty" "presentty-console")))
+             #t)))))
+    (inputs
+     `(("cowsay" ,cowsay)
+       ("figlet" ,figlet)
+       ("jp2a" ,jp2a)
+       ("python-docutils" ,python-docutils)
+       ("python-pillow" ,python-pillow-2.9)
+       ("python-six" ,python-six)
+       ("python-urwid" ,python-urwid)))
+    (native-inputs
+     `(("python-pbr" ,python-pbr)
+       ("python-pygments" ,python-pygments)))
+    (home-page "http://git.inaugust.com/cgit/presentty/")
+    (synopsis "Console-based presentation system")
+    (description "Presentty is a console-based presentation program where slides
+are authored in reStructuredText.  Its features include, but are not limited to:
+Cross-fade animations, progressive list display, panning transitions, syntax
+highlighting, Cowsay and figlet integration, ANSI art, JPEG display.")
+    (license license:gpl3+)))