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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Nicolò Balzarotti <nicolo@nixo.xyz>
+;;;
+;;; 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 (guix build-system julia)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix packages)
+  #:use-module (guix derivations)
+  #:use-module (guix search-paths)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-26)
+  #:export (%julia-build-system-modules
+            julia-build
+            julia-build-system))
+
+;; Commentary:
+;;
+;; Standard build procedure for Julia packages.
+;;
+;; Code:
+
+(define %julia-build-system-modules
+  ;; Build-side modules imported by default.
+  `((guix build julia-build-system)
+    ,@%gnu-build-system-modules))
+
+(define (default-julia)
+  "Return the default Julia package."
+  ;; Lazily resolve the binding to avoid a circular dependency.
+  (let ((julia-mod (resolve-interface '(gnu packages julia))))
+    (module-ref julia-mod 'julia)))
+
+(define* (lower name
+                #:key source inputs native-inputs outputs system target
+                (julia (default-julia))
+                #:allow-other-keys
+                #:rest arguments)
+  "Return a bag for NAME."
+  (define private-keywords
+    '(#:target #:julia #:inputs #:native-inputs))
+
+  (and (not target)                        ;XXX: no cross-compilation
+       (bag
+         (name name)
+         (system system)
+         (host-inputs `(,@(if source
+                              `(("source" ,source))
+                              '())
+                        ,@inputs
+                        
+                        ;; Keep the standard inputs of 'gnu-build-system'.
+                        ,@(standard-packages)))
+         (build-inputs `(("julia" ,julia)
+                         ,@native-inputs))
+         (outputs outputs)
+         (build julia-build)
+         (arguments (strip-keyword-arguments private-keywords arguments)))))
+
+(define* (julia-build store name inputs
+                      #:key source
+                      (tests? #f)
+                      (phases '(@ (guix build julia-build-system)
+                                  %standard-phases))
+                      (outputs '("out"))
+                      (search-paths '())
+                      (system (%current-system))
+                      (guile #f)
+                      (imported-modules %julia-build-system-modules)
+                      (modules '((guix build julia-build-system)
+                                 (guix build utils))))
+  "Build SOURCE using Julia, and with INPUTS."
+  (define builder
+    `(begin
+       (use-modules ,@modules)
+       (julia-build #:name ,name
+                    #:source ,(match (assoc-ref inputs "source")
+                                (((? derivation? source))
+                                 (derivation->output-path source))
+                                ((source)
+                                 source)
+                                (source
+                                 source))
+                    #:system ,system
+                    #:tests? ,tests?
+                    #:phases ,phases
+                    #:outputs %outputs
+                    #:search-paths ',(map search-path-specification->sexp
+                                          search-paths)
+                    #:inputs %build-inputs)))
+
+  (define guile-for-build
+    (match guile
+      ((? package?)
+       (package-derivation store guile system #:graft? #f))
+      (#f                                         ; the default
+       (let* ((distro (resolve-interface '(gnu packages commencement)))
+              (guile  (module-ref distro 'guile-final)))
+         (package-derivation store guile system #:graft? #f)))))
+
+  (build-expression->derivation store name builder
+                                #:inputs inputs
+                                #:system system
+                                #:modules imported-modules
+                                #:outputs outputs
+                                #:guile-for-build guile-for-build))
+
+(define julia-build-system
+  (build-system
+   (name 'julia)
+   (description "The build system for Julia packages")
+   (lower lower)))
+
+;;; julia.scm ends here