new file mode 100644
@@ -0,0 +1,119 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Edouard Klein <edk@beaver-labs.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 gerbil)
+ #:use-module (guix store)
+ #:use-module (guix utils)
+ #:use-module (guix derivations)
+ #:use-module (guix search-paths)
+ #:use-module (guix build-system)
+ #:use-module (guix build-system gnu)
+ #:use-module (guix packages)
+ #:use-module (ice-9 match)
+ #:export (%gerbil-build-system-modules
+ gerbil-build
+ gerbil-build-system))
+
+(define %gerbil-build-system-modules
+ ;; Build-side modules imported by default.
+ `((guix build gerbil-build-system)
+ ,@%gnu-build-system-modules))
+
+(define (default-gerbil)
+ "Return the default Gerbil package."
+ ;; Do not use `@' to avoid introducing circular dependencies.
+ (let ((module (resolve-interface '(gnu packages scheme))))
+ (module-ref module 'gerbil)))
+
+(define* (lower name
+ #:key source inputs native-inputs outputs system target
+ (gerbil (default-gerbil))
+ #:allow-other-keys
+ #:rest arguments)
+ "Return a bag for NAME."
+ (define private-keywords
+ '(#:source #:target #:inputs #:native-inputs))
+ (bag
+ (name name)
+ (system system)
+ (target target)
+ (host-inputs `(,@(if source
+ `(("source" ,source))
+ '())
+ ,@inputs
+ ;; Keep the standard inputs of 'gnu-build-system'.
+ ,@(standard-packages)))
+ (build-inputs `(("gerbil" ,gerbil)
+ ,@native-inputs))
+ (outputs outputs)
+ (build gerbil-build)
+ (arguments (strip-keyword-arguments private-keywords arguments))))
+
+(define* (gerbil-build store name inputs
+ #:key
+ (phases '(@ (guix build gerbil-build-system)
+ %standard-phases))
+ (outputs '("out"))
+ (search-paths '())
+ (system (%current-system))
+ (guile #f)
+ (imported-modules %gerbil-build-system-modules)
+ (modules '((guix build gerbil-build-system)
+ (guix build utils))))
+ "Build SOURCE using GERBIL and with INPUTS."
+ (define builder
+ `(begin
+ (use-modules ,@modules)
+ (gerbil-build #:name ,name
+ #:source ,(match (assoc-ref inputs "source")
+ (((? derivation? source))
+ (derivation->output-path source))
+ ((source)
+ source)
+ (source
+ source))
+ #:system ,system
+ #: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 gerbil-build-system
+ (build-system
+ (name 'gerbil)
+ (description "The standard Gerbil build system")
+ (lower lower)))
+
+;;; gerbil.scm ends here
new file mode 100644
@@ -0,0 +1,102 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Edouard Klein <edk@beaver-labs.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 gerbil-build-system)
+ #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+ #:use-module (guix build utils)
+ #:use-module (ice-9 match)
+ #:use-module (ice-9 ftw)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-26)
+ #:export (%standard-phases
+ gerbil-build))
+
+;; Gerbil's build system and package management is documented at
+;; https://cons.io/guide/package-manager.html
+;; https://cons.io/guide/build.html
+;; https://cons.io/guide/env-vars.html
+;;
+;; The compiler is writing its output in the directory
+;; pointed to by GERBIL_PATH (or ~/.gerbil by default).
+;;
+;; Every package is supposed to have a build.ss script
+;; whose default action (when called with no argument)
+;; is to compile the package.
+;;
+;; The GERBIL_LOADPATH env variable tells gerbil's runtime
+;; where it can find its loadable code.
+;;
+;; GERBIL_HOME tells gerbil where to find its runtime
+;; and standard library
+;;
+;; This build system therefore just
+;; - makes GERBIL_PATH point to the output directory in the store,
+;; - makes GERBIL_LOADPATH point to the lib subdir
+;; of all the gerbil inputs,
+;; - calls ./build.ss,
+;; - wrap any executable with GERBIL_LOADPATH set the the lib
+;; subdir of all the gerbil inputs plus the lib subdir
+;; of the current package's output, and with GERBIL_HOME
+;; set to the lib directory of the 'gerbil' input
+
+(define (loadpath inputs)
+ (string-join (map (match-lambda
+ ((_ . path)
+ (string-append path "/lib")))
+ ;; Restrict to inputs beginning with "gerbil-".
+ (filter (match-lambda
+ ((name . _)
+ (string-prefix? "gerbil-" name)))
+ inputs))
+ ":"))
+
+(define (gerbil-home inputs)
+ (assoc-ref inputs "gerbil"))
+
+(define* (install #:key inputs outputs #:allow-other-keys)
+ "Install a given Gerbil package."
+ (let ((out (assoc-ref outputs "out"))
+ (in (loadpath inputs)))
+ (setenv "GERBIL_PATH" out)
+ (setenv "GERBIL_LOADPATH" in)
+ (invoke "./build.ss"))
+ #t)
+
+(define* (wrap #:key inputs outputs #:allow-other-keys)
+ "Wrap any executable with a proper GERBIL_LOADPATH and GERBIL_HOME"
+ (let* ((out (assoc-ref outputs "out"))
+ (in (loadpath inputs))
+ (gerbil-loadpath (string-append out "/lib:" in)))
+ (for-each (cut wrap-program <>
+ `("GERBIL_LOADPATH" = (,gerbil-loadpath))
+ `("GERBIL_HOME" = (,(gerbil-home inputs))))
+ (find-files (string-append out "/bin")))))
+
+(define %standard-phases
+ (modify-phases gnu:%standard-phases
+ (delete 'bootstrap)
+ (delete 'configure) ;not needed
+ (delete 'build) ;build.ss does both build and install
+ (delete 'check) ;no standard way of testing
+ (replace 'install install)
+ (add-after 'install 'wrap wrap)))
+
+(define* (gerbil-build #:key inputs (phases %standard-phases)
+ #:allow-other-keys #:rest args)
+ "Build the given Gerbil package, applying all of PHASES in order."
+ (apply gnu:gnu-build #:inputs inputs #:phases phases args))