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+;;; 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 (invoke-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 (match-lambda
+ ((_ . path)
+ (string-append path "/site-library")))
+ ;; Restrict to inputs beginning with "r-".
+ (filter (match-lambda
+ ((name . _)
+ (string-prefix? "r-" name)))
+ inputs))
+ ":"))
+
+(define* (check #:key test-target inputs outputs tests? #:allow-other-keys)
+ "Run the test suite of a given R package."
+ (let* ((libdir (string-append (assoc-ref outputs "out") "/site-library/"))
+
+ ;; R package names are case-sensitive and cannot be derived from the
+ ;; Guix package name. The exact package name is required as an
+ ;; argument to ‘tools::testInstalledPackage’, which runs the tests
+ ;; for a package given its name and the path to the “library” (a
+ ;; location for a collection of R packages) containing it.
+
+ ;; Since there can only be one R package in any collection (=
+ ;; “library”), the name of the only directory in the collection path
+ ;; is the original name of the R package.
+ (pkg-name (car (scandir libdir (negate (cut member <> '("." ".."))))))
+ (testdir (string-append libdir pkg-name "/" test-target))
+ (site-path (string-append libdir ":" (generate-site-path inputs))))
+ (if (and tests? (file-exists? testdir))
+ (begin
+ (setenv "R_LIBS_SITE" site-path)
+ (pipe-to-r (string-append "tools::testInstalledPackage(\"" pkg-name "\", "
+ "lib.loc = \"" libdir "\")")
+ '("--no-save" "--slave")))
+ #t)))
+
+(define* (install #:key outputs inputs (configure-flags '())
+ #:allow-other-keys)
+ "Install a given R package."
+ (let* ((out (assoc-ref outputs "out"))
+ (site-library (string-append out "/site-library/"))
+ (params (append configure-flags
+ (list "--install-tests"
+ (string-append "--library=" site-library)
+ ".")))
+ (site-path (string-append site-library ":"
+ (generate-site-path inputs))))
+ ;; If dependencies cannot be found at install time, R will refuse to
+ ;; install the package.
+ (setenv "R_LIBS_SITE" site-path)
+ ;; Some R packages contain a configure script for which the CONFIG_SHELL
+ ;; variable should be set.
+ (setenv "CONFIG_SHELL" (which "bash"))
+ (mkdir-p site-library)
+ (invoke-r "INSTALL" params)))
+
+(define %standard-phases
+ (modify-phases gnu:%standard-phases
+ (delete 'configure)
+ (delete 'build)
+ (delete 'check) ; tests must be run after installation
+ (replace 'install install)
+ (add-after 'install 'check check)))
+
+(define* (r-build #:key inputs (phases %standard-phases)
+ #:allow-other-keys #:rest args)
+ "Build the given R package, applying all of PHASES in order."
+ (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; r-build-system.scm ends here