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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Efraim Flashner <efraim@flashner.co.il>
+;;;
+;;; 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 rakudo-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 ftw)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (%standard-phases
+            rakudo-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard Rakudo package build procedure.
+;;
+;; Code:
+
+(define* (check #:key tests? inputs with-prove6? #:allow-other-keys)
+  (if (and tests? (assoc-ref inputs "perl6-tap-harness"))
+  ;(if (and tests? with-prove6?)
+      (invoke "prove6" "-I=lib" "t/")
+      (format #t "test suite not run~%"))
+  #t)
+
+(define* (install #:key inputs outputs with-zef? #:allow-other-keys)
+  "Install a given Perl6 package."
+  (let* ((out   (assoc-ref outputs "out"))
+         (perl6 (string-append out "/share/perl6")))
+    (if (assoc-ref inputs "perl6-zef")
+    ;(if with-zef?
+        (begin
+          (let ((zef (string-append (assoc-ref inputs "perl6-zef")
+                                    "/bin/zef")))
+            (setenv "HOME" (getcwd))
+            (mkdir-p perl6)
+            (invoke zef "install" "--verbose" "."
+                    ;; Don't install any of the following:
+                    "--/depends" "--/build-depends" "--/test-depends"
+                    (string-append "--install-to=" perl6))
+            (delete-file (string-append perl6 "/repo.lock")))
+          #t)
+        (begin
+          (let ((inst (string-append (assoc-ref inputs "rakudo")
+                                     "/share/perl6/tools/install-dist.p6")))
+            (setenv "RAKUDO_RERESOLVE_DEPENDENCIES" "0")
+            (setenv "RAKUDO_MODULE_DEBUG" "1") ; be verbose while building
+            (invoke inst (string-append "--to=" perl6) "--for=site"))))))
+
+(define* (install-libs #:key outputs #:allow-other-keys)
+  (let ((out  (assoc-ref outputs "out"))
+        (lock "lib/.precomp/.lock"))
+    (when (file-exists? lock)
+      (delete-file "lib/.precomp/.lock"))
+    (copy-recursively "lib" (string-append out "/share/perl6/lib"))
+    #t))
+
+(define* (install-bins #:key outputs #:allow-other-keys)
+  (let ((out  (assoc-ref outputs "out")))
+    (when (file-exists? "bin")
+      (for-each (lambda (file)
+                  (install-file file (string-append out "/bin"))
+                  (chmod (string-append out "/" file) #o555))
+                (find-files "bin" ".*")))
+    (when (file-exists? "sbin")
+      (for-each (lambda (file)
+                  (install-file file (string-append out "/sbin"))
+                  (chmod (string-append out "/" file) #o555))
+                (find-files "sbin" ".*")))
+    #t))
+
+(define* (install-resources #:key outputs #:allow-other-keys)
+  (let ((out  (assoc-ref outputs "out")))
+    (when (file-exists? "resources")
+      (copy-recursively "resources"
+                        (string-append out "/share/perl6/resources")))
+  #t))
+
+(define* (wrap #:key inputs outputs #:allow-other-keys)
+  (define (list-of-files dir)
+    (map (cut string-append dir "/" <>)
+         (or (scandir dir (lambda (f)
+                            (let ((s (stat (string-append dir "/" f))))
+                              (eq? 'regular (stat:type s)))))
+             '())))
+
+  (define bindirs
+    (append-map (match-lambda
+                 ((_ . dir)
+                  (list (string-append dir "/bin")
+                        (string-append dir "/sbin"))))
+                outputs))
+
+  (let* ((out  (assoc-ref outputs "out"))
+         (var `("PERL6LIB" "," prefix
+                ,(cons (string-append out "/share/perl6/lib,"
+                                      out "/share/perl6/site/lib,"
+                                      out "/share/perl6/vendor/lib")
+                       (search-path-as-string->list
+                        (or (getenv "PERL6LIB") "") #\,)))))
+    (for-each (lambda (dir)
+                (let ((files (list-of-files dir)))
+                  (for-each (cut wrap-program <> var)
+                            files)))
+              bindirs)
+    #t))
+
+(define %standard-phases
+  ;; No need for 'bootstrap, 'configure or 'build.
+  (modify-phases gnu:%standard-phases
+    (delete 'bootstrap)
+    (delete 'configure)
+    (delete 'build)
+    (replace 'check check)
+    (replace 'install install)
+    (add-before 'install 'install-lib-dir install-libs)
+    (add-after 'install-lib-dir 'install-resources install-resources)
+    (add-after 'install-resources 'install-binaries install-bins)
+    ;; needs to be after 'install-binaries and all 'install phases
+    (add-after 'install 'wrap wrap)))
+
+(define* (rakudo-build #:key inputs (phases %standard-phases)
+                       #:allow-other-keys #:rest args)
+  "Build the given Perl6 package, applying all of PHASES in order."
+  (apply gnu:gnu-build
+         #:inputs inputs #:phases phases
+         args))
+
+;;; rakudo-build-system.scm ends here