gnu: Add loko-scheme.

* gnu/packages/loko.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>

gnu/local.mk

@@ -36,6 +36,7 @@
 # Copyright © 2020 Jan Wielkiewicz <tona_kosmicznego_smiecia@interia.pl>
 # Copyright © 2020 Brice Waegeneire <brice@waegenei.re>
 # Copyright © 2020 Tanguy Le Carrour <tanguy@bioneland.org>
+# Copyright © 2020 Martin Becze <mjbecze@riseup.net>
 #
 # This file is part of GNU Guix.
 #
@@ -342,6 +343,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/lout.scm				\
   %D%/packages/logging.scm			\
   %D%/packages/logo.scm				\
+  %D%/packages/loko.scm				\
   %D%/packages/lolcode.scm                      \
   %D%/packages/lsof.scm				\
   %D%/packages/lua.scm				\

gnu/packages/loko.scm

@@ -0,0 +1,86 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Martin Becze <mjbecze@riseup.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 loko)
+  #:use-module (guix packages)
+  #:use-module (guix git-download)
+  #:use-module (guix build-system gnu)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (gnu packages package-management)
+  #:use-module (gnu packages guile)
+  #:use-module (gnu packages guile-xyz)
+  #:use-module (gnu packages chez))
+
+(define-public loko-scheme
+  (package
+    (name "loko-scheme")
+    (version "0.6.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://gitlab.com/weinholt/loko")
+             (commit (string-append "v" version))))
+       (sha256
+        (base32 "019jlh3lywy912cfz689c9fxgf4bi5700i9k04g7sl5w5gchj36m"))
+       (file-name (git-file-name name version))))
+    (build-system gnu-build-system)
+    (arguments
+     `(;; r7rs tests are still failing as of 0.6.0.
+       #:tests? #f
+       #:strip-binaries? #f
+       #:make-flags
+       (let ((out (assoc-ref %outputs "out")))
+         (list
+          (string-append "PREFIX=" out)
+          (string-append "GDB_AUTOLOAD_PATH=" out "/share/gdb/auto-load")))
+       #:phases
+       (modify-phases %standard-phases
+         (delete 'configure)
+         (add-before 'build 'akku-fixes
+           (lambda* (#:key inputs #:allow-other-keys)
+             (delete-file "Akku.lock")
+             (substitute* "Akku.manifest"
+               (("\\(depends.*") "(depends)"))
+             (invoke "akku" "install")
+             (let ((dest "./.akku/lib/")
+                   (source "/share/guile/site/3.0/"))
+               (for-each
+                (lambda (name)
+                  ;; Symlink the scheme libraries so that Akku can find them
+                  (symlink (string-append (assoc-ref inputs name) source name)
+                           (string-append dest name)))
+                '("struct" "laesare" "pfds" "machine-code")))
+             (substitute* ".akku/env"
+               (("/bin/sh") (which "sh")))
+             #t)))))
+    (native-inputs
+     `(("akku" ,akku)
+       ("chez-scheme" ,chez-scheme)
+       ("struct" ,guile-struct-pack)
+       ("laesare" ,guile-laesare)
+       ("pfds" ,guile-pfds)
+       ("machine-code" ,guile-machine-code)))
+    (home-page "https://scheme.fail")
+    (synopsis "Implementation of the algorithmic language Scheme")
+    (description
+     "Loko Scheme is intended to be a platform for application and operating
+system development.  It is written purely in Scheme and some assembler
+(i.e. no C code at the bottom).  Both the R6RS and the R7RS standards are
+supported.")
+    (license license:agpl3+)))