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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2023 Josselin Poiret <dev@jpoiret.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 agda)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix build-system haskell)
+  #:use-module (guix gexp)
+  #:use-module (guix monads)
+  #:use-module (guix packages)
+  #:use-module (guix search-paths)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:export (default-agda
+
+            %agda-build-system-modules
+            agda-build-system))
+
+(define (default-agda)
+  ;; Lazily resolve the binding to avoid a circular dependency.
+  (let ((agda (resolve-interface '(gnu packages agda))))
+    (module-ref agda 'agda)))
+
+(define %agda-build-system-modules
+  `((guix build agda-build-system)
+    ,@%gnu-build-system-modules))
+
+(define %default-modules
+  '((guix build agda-build-system)
+    (guix build utils)))
+
+(define* (lower name
+                #:key source inputs native-inputs outputs system target
+                (agda (default-agda))
+                gnu-and-haskell?
+                #:allow-other-keys
+                #:rest arguments)
+  "Return a bag for NAME."
+  (define private-keywords
+    '(#:target #:agda #:gnu-and-haskell? #:inputs #:native-inputs))
+
+  ;; TODO: cross-compilation support
+  (and (not target)
+       (bag
+         (name name)
+         (system system)
+         (host-inputs `(,@(if source
+                              `(("source" ,source))
+                              '())
+                        ,@inputs))
+         (build-inputs `(("agda" ,agda)
+                         ,@(if gnu-and-haskell?
+                               (cons*
+                                (list "ghc" (default-haskell))
+                                (standard-packages))
+                               '())
+                         ,(assoc "locales" (standard-packages))
+                         ,@native-inputs))
+         (outputs outputs)
+         (build agda-build)
+         (arguments (strip-keyword-arguments private-keywords arguments)))))
+
+(define* (agda-build name inputs
+                     #:key
+                     source
+                     (phases '%standard-phases)
+                     (outputs '("out"))
+                     (search-paths '())
+                     (unpack-path "")
+                     (build-flags ''())
+                     (tests? #t)
+                     (system (%current-system))
+                     (guile #f)
+                     plan
+                     (extra-files '("^\\./.*\\.agda-lib$"))
+                     (imported-modules %agda-build-system-modules)
+                     (modules %default-modules))
+  (define builder
+    (with-imported-modules imported-modules
+      #~(begin
+          (use-modules #$@(sexp->gexp modules))
+          (agda-build #:name #$name
+                      #:source #+source
+                      #:system #$system
+                      #:phases #$phases
+                      #:outputs #$(outputs->gexp outputs)
+                      #:search-paths '#$(sexp->gexp
+                                         (map search-path-specification->sexp
+                                              search-paths))
+                      #:unpack-path #$unpack-path
+                      #:build-flags #$build-flags
+                      #:tests? #$tests?
+                      #:inputs #$(input-tuples->gexp inputs)
+                      #:plan '#$plan
+                      #:extra-files '#$extra-files))))
+
+  (mlet %store-monad ((guile (package->derivation (or guile (default-guile))
+                                                  system #:graft? #f)))
+    (gexp->derivation name builder
+                      #:system system
+                      #:guile-for-build guile)))
+
+(define agda-build-system
+  (build-system
+    (name 'agda)
+    (description
+     "Build system for Agda libraries")
+    (lower lower)))