;;; guix.scm -- Guix package definition
;; Copyright (C) 2020 Efraim Flashner <efraim@flashner.co.il>
;;
;; This file is part of the GNU Shepherd.
;;
;; The GNU Shepherd 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.
;;
;; The GNU Shepherd 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 the GNU Shepherd.  If not, see <http://www.gnu.org/licenses/>.

(use-modules
  (guix packages)
  ((guix git-download) #:select (git-version))
  ((guix build utils) #:select (find-files))
  ((guix gexp) #:select (local-file))
  ((guix utils) #:select (substitute-keyword-arguments))
  ((gnu packages) #:select (specification->package))
  ((ice-9 popen) #:select (open-pipe))
  ((ice-9 rdelim) #:select (read-string))
  ((srfi srfi-1) #:select (any)))

(define %source-dir (dirname (dirname (current-filename))))

(define %git-commit
  (read-string (open-pipe "git show HEAD | head -1 | cut -d ' ' -f 2" OPEN_READ)))

(define (keep-file? file stat)
  (not (any (lambda (my-string)
              (string-contains file my-string))
            (list ".git" ".dir-locals.el" "build-aux"))))

(define (build-from-git base)
  (package
    (inherit base)
    (version (git-version (package-version base) "HEAD" %git-commit))
    (source (local-file %source-dir
                        #:recursive? #t
                        #:select? keep-file?))
    (native-inputs
     `(("autoconf" ,(specification->package "autoconf"))
       ("automake" ,(specification->package "automake"))
       ("gettext" ,(specification->package "gettext"))
       ("help2man" ,(specification->package "help2man"))
       ("texinfo" ,(specification->package "texinfo"))
       ,@(package-native-inputs base)))
    (arguments
     `(#:configure-flags '("--localstatedir=/var")
       #:make-flags (list "GUILE_AUTO_COMPILE=0")
       #:phases
       (modify-phases %standard-phases
         (add-after 'unpack 'make-po-directory-writable
           (lambda _
             (for-each make-file-writable
               (find-files "po"))
               #t)))))))

(list (build-from-git (specification->package "shepherd"))
      (build-from-git (specification->package "guile2.2-shepherd"))
      (let ((base (build-from-git (specification->package "guile2.0-shepherd"))))
        (package
          (inherit base)
          (arguments
           (substitute-keyword-arguments (package-arguments base)
             ((#:phases phases)
              `(modify-phases ,phases
                 (add-after 'unpack 'patch-source
                   (lambda _
                     ;; (ice-9 threads) isn't available in guile-2.0
                     (substitute* "modules/shepherd.scm"
                       ((".*\\(ice-9 threads\\).*") ""))
                     #t)))))))))