;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; 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 r-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 (ice-9 popen)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:export (%standard-phases
            r-build))

;; Commentary:
;;
;; Builder-side code of the standard build procedure for R packages.
;;
;; Code:

(define (call-r command params)
  (zero? (apply system* "R" "CMD" command params)))

(define (pipe-to-r command params)
  (let ((port (apply open-pipe* OPEN_WRITE "R" params)))
    (display command port)
    (zero? (status:exit-val (close-pipe port)))))

(define (generate-site-path inputs)
  (string-join (map (lambda (input)
                      (string-append (cdr input) "/site-library"))
                    ;; Restrict to inputs beginning with "r-".
                    (filter (lambda (input)
                              (string-prefix? "r-" (car input)))
                            inputs))