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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2020 Hartmut Goebel <h.goebel@crazy-compilers.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 (guix build-system rebar3)
+ #: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 (%rebar3-build-system-modules
+ rebar3-build
+ rebar3-build-system))
+
+;;
+;; Standard build procedure for Erlang packages using Rebar3.
+;;
+
+(define %rebar3-build-system-modules
+ ;; Build-side modules imported by default.
+ `((guix build rebar3-build-system)
+ ,@%gnu-build-system-modules))
+
+(define (default-rebar3)
+ "Return the default Rebar3 package."
+ ;; Lazily resolve the binding to avoid a circular dependency.
+ (let ((erlang-mod (resolve-interface '(gnu packages erlang))))
+ (module-ref erlang-mod 'rebar3)))
+
+(define (default-erlang)
+ "Return the default Erlang package."
+ ;; Lazily resolve the binding to avoid a circular dependency.
+ (let ((erlang-mod (resolve-interface '(gnu packages erlang))))
+ (module-ref erlang-mod 'erlang)))
+
+(define* (lower name
+ #:key source inputs native-inputs outputs system target
+ (rebar (default-rebar3))
+ (erlang (default-erlang))
+ #:allow-other-keys
+ #:rest arguments)
+ "Return a bag for NAME."
+ (define private-keywords
+ '(#:source #:target #:rebar #:inputs #:native-inputs))
+
+ (and (not target) ;XXX: no cross-compilation
+ (bag
+ (name name)
+ (system system)
+ (host-inputs `(,@(if source
+ `(("source" ,source))
+ '())
+ ,@inputs))
+ (build-inputs `(("rebar" ,rebar)
+ ("erlang" ,erlang) ;; for escriptize
+ ,@native-inputs
+ ;; Keep the standard inputs of 'gnu-build-system'.
+ ,@(standard-packages)))
+ (outputs outputs)
+ (build rebar3-build)
+ (arguments (strip-keyword-arguments private-keywords arguments)))))
+
+(define* (rebar3-build store name inputs
+ #:key
+ (tests? #t)
+ (test-target "eunit")
+ (configure-flags ''())
+ (make-flags ''("skip_deps=true" "-vv"))
+ (build-target "compile")
+ ;; TODO: pkg-name
+ (phases '(@ (guix build rebar3-build-system)
+ %standard-phases))
+ (outputs '("out"))
+ (search-paths '())
+ (system (%current-system))
+ (guile #f)
+ (imported-modules %rebar3-build-system-modules)
+ (modules '((guix build rebar3-build-system)
+ (guix build utils))))
+ "Build SOURCE with INPUTS."
+ (define builder
+ `(begin
+ (use-modules ,@modules)
+ (rebar3-build #:name ,name
+ #:source ,(match (assoc-ref inputs "source")
+ (((? derivation? source))
+ (derivation->output-path source))
+ ((source)
+ source)
+ (source
+ source))
+ #:make-flags ,make-flags
+ #:configure-flags ,configure-flags
+ #:system ,system
+ #:tests? ,tests?
+ #:test-target ,test-target
+ #:build-target ,build-target
+ #: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 rebar3-build-system
+ (build-system
+ (name 'rebar3)
+ (description "The standard Rebar3 build system")
+ (lower lower)))