;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021 Maxime Devos <maximedevos@telenet.be>
;;;
;;; 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/>.

(use-modules (guix packages)
             (gnu packages animation)
             (guix git-download))

(define-syntax with-source-location
  (lambda (s)
    (syntax-case s ()
      ((_ (exp . exp*) source)
       "Expand to (EXP . EXP*), but with the source location replaced
by the source location of SOURCE."
       (datum->syntax s (cons #'exp #'exp*) #:source (syntax-source #'source))))))

(define-syntax let&
  (lambda (s)
    "Like 'let', but let the inner expression have the location
of the 'let&' form when it is expanded.  Only a single inner
expression is allowed."
    (syntax-case s ()
      ((_ bindings exp)
       #'(let bindings
           (with-source-location exp s))))))


(define-public gnash2
  ;; The last tagged release of Gnash was in 2013.
  (let& ((commit "583ccbc1275c7701dc4843ec12142ff86bb305b4")
         (revision "0"))
    (package
      (inherit gnash)
      (name "gnash2")
      (version (git-version "0.8.11" revision commit))
      (source
       (origin
         (method git-fetch)
         (uri (git-reference
               (url "https://git.savannah.gnu.org/git/gnash.git/")
               (commit commit)))
         (file-name (git-file-name name version))
         (patches (search-patches "gnash-fix-giflib-version.patch"))
         (sha256
          (base32 "0fh0bljn0i6ypyh6l99afi855p7ki7lm869nq1qj6k8hrrwhmfry")))))))

(format #t "old: ~a~%" (package-location gnash))
(format #t "new: ~a~%" (package-location gnash2))
;; ^ it says column 2, which is the column of the let& form.