gnu: Add qlogo.

* gnu/packages/logo.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Register it.
* gnu/packages/logo.scm (qlogo): New variable.

gnu/local.mk

@@ -299,6 +299,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/llvm.scm				\
   %D%/packages/lout.scm				\
   %D%/packages/logging.scm			\
+  %D%/packages/logo.scm				\
   %D%/packages/lolcode.scm                      \
   %D%/packages/lsof.scm				\
   %D%/packages/lua.scm				\

gnu/packages/logo.scm

@@ -0,0 +1,71 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; 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 logo)
+  #:use-module (gnu packages qt)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix download)
+  #:use-module (guix packages)
+  #:use-module (guix build-system gnu))
+
+(define-public qlogo
+  (package
+    (name "qlogo")
+    (version "0.92")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://qlogo.org/assets/sources/QLogo-"
+                           version ".tgz"))
+       (sha256
+        (base32
+         "0cpyj1ji6hjy7zzz05672f0j6fr0mwpc1y3sq36hhkv2fkpidw22"))))
+    (build-system gnu-build-system)
+    (inputs
+     `(("qtbase" ,qtbase)))
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (replace 'configure
+           (lambda* (#:key outputs #:allow-other-keys)
+             (substitute* "QLogo.pro"
+               (("target\\.path = /usr/bin")
+                (string-append "target.path = "
+                               (assoc-ref outputs "out") "/bin")))
+             (invoke "qmake" "QLogo.pro")))
+         ;; The check phase rebuilds the source for tests. So, it needs to be
+         ;; run after the install phase has installed the outputs of the build
+         ;; phase.
+         (delete 'check)
+         (add-after 'install 'check
+           (lambda _
+             ;; Clean files created by the build phase.
+             (invoke "make" "clean")
+             ;; QLogo tries to create its "dribble file" in the home
+             ;; directory. So, set HOME.
+             (setenv "HOME" "/tmp")
+             ;; Build and run tests.
+             (invoke "qmake" "TestQLogo.pro")
+             (invoke "make" "-j" (number->string (parallel-job-count)))
+             (invoke "./testqlogo"))))))
+    (home-page "https://qlogo.org")
+    (synopsis "Logo interpreter using Qt and OpenGL")
+    (description "QLogo is an interpreter for the Logo language written in C++
+using Qt and OpenGL.  Specifically, it mimics, as reasonably as possible, the
+UCBLogo interpreter.")
+    (license license:gpl2+)))