Merge remote-tracking branch 'origin/master' into core-updates

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diff --git a/gnu/packages/piet.scm b/gnu/packages/piet.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Jesse Gibbons <jgibbons2357+guix@gmail.com>
+;;;
+;;; 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 piet)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages gd)
+  #:use-module (gnu packages groff)
+  #:use-module (gnu packages image)
+  #:use-module (gnu packages tcl))
+
+(define-public npiet
+  (package
+    (name "npiet")
+    (version "1.3f")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://www.bertnase.de/npiet/npiet-"
+                                  version ".tar.gz"))
+              (sha256
+               (base32
+                "0nl59fhdqqr7nslxdirdn8nvlq5wws67c7jyx2ckbmxbc9h8bv9d"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'install 'wrap-binaries
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let ((out (assoc-ref outputs "out")))
+               (wrap-program (string-append out "/bin/npietedit")
+                 `("PATH" ":" prefix (,(dirname (which "wish")))))
+               #t))))))
+    (inputs
+     `(("gd" ,gd)
+       ("giflib" ,giflib)
+       ("libpng" ,libpng)
+       ("tk" ,tk)))
+    (native-inputs `(("groff" ,groff)))
+    (synopsis "Piet interpreter")
+    (description
+     "Npiet is an interpreter for the piet programming language.  Instead of
+text, piet programs are pictures.  Commands are determined based on changes in
+color.
+
+This package includes:
+@enumerate
+@item npiet, a piet interpreter with debugging capabilities
+@item npiet-foogol, a program that builds a piet program from foogol, an
+algol-like language
+@item npietedit, an editor for the piet programming language
+@end enumerate")
+    (home-page "https://www.bertnase.de/npiet/")
+    (license license:gpl2+)))