;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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/>.

;;;
;;; This file defines build jobs for the Hydra continuation integration
;;; tool.
;;;

;; Attempt to use our very own Guix modules.
(eval-when (compile load eval)

  ;; Ignore any available .go, and force recompilation.  This is because our
  ;; checkout in the store has mtime set to the epoch, and thus .go files look
  ;; newer, even though they may not correspond.
  (set! %fresh-auto-compile #t)

  (and=> (assoc-ref (current-source-location) 'filename)
         (lambda (file)
           (let ((dir (string-append (dirname file) "/../..")))
             (format (current-error-port) "prepending ~s to the load path~%"
                     dir)
             (set! %load-path (cons dir %load-path))))))

(use-modules (guix store)
             (guix packages)
             (guix derivations)
             ((guix utils) #:select (%current-system))
             (gnu packages)
             (gnu packages base)
             (gnu packages gawk)
             (gnu packages guile)
             (gnu packages gettext)
             (gnu packages multiprecision)
             (gnu packages make-bootstrap)
             (srfi srfi-1)
             (srfi srfi-26)
             (ice-9 match))

;; XXX: Debugging hack: since `hydra-eval-guile-jobs' redirects the output
;; port to the bit bucket, let us write to the error port instead.
(setvbuf (current-error-port) _IOLBF)
(set-current-output-port (current-error-port))

(define* (package->alist store package system
                         #:optional (package-derivation package-derivation))
  "Convert PACKAGE to an alist suitable for Hydra."
  `((derivation . ,(derivation-file-name
                    (package-derivation store package system)))
    (description . ,(package-synopsis package))
    (long-description . ,(package-description package))
    (license . ,(package-license package))
    (home-page . ,(package-home-page package))
    (maintainers . ("bug-guix@gnu.org"))))

(define (package-job store job-name package system)
  "Return a job called JOB-NAME that builds PACKAGE on SYSTEM."
  (let ((job-name (symbol-append job-name (string->symbol ".")
                                 (string->symbol system))))
    `(,job-name . ,(cut package->alist store package system))))

(define (package-cross-job store job-name package target system)
  "Return a job called TARGET.JOB-NAME that cross-builds PACKAGE for TARGET on
SYSTEM."
  `(,(symbol-append (string->symbol target) (string->symbol ".") job-name
                    (string->symbol ".") (string->symbol system)) .
    ,(cute package->alist store package system
           (cut package-cross-derivation <> <> target <>))))

(define %core-packages
  (list gmp mpfr mpc coreutils findutils diffutils patch sed grep
        gawk gettext hello guile-2.0
        %bootstrap-binaries-tarball
        %binutils-bootstrap-tarball
        %glibc-bootstrap-tarball
        %gcc-bootstrap-tarball
        %guile-bootstrap-tarball
        %bootstrap-tarballs))

(define %packages-to-cross-build
  %core-packages)

(define %cross-targets
  '("mips64el-linux-gnu"
    "mips64el-linux-gnuabi64"))

(define (hydra-jobs store arguments)
  "Return Hydra jobs."
  (define systems
    (match (filter-map (match-lambda
                        (('system . value)
                         value)
                        (_ #f))
                       arguments)
      ((lst ..1)
       lst)
      (_
       (list (%current-system)))))

  (define subset
    (match (assoc-ref arguments 'subset)
      ("core" 'core)                              ; only build core packages
      (_ 'all)))                                  ; build everything

  (define job-name
    (compose string->symbol package-full-name))

  (define (cross-jobs system)
    (append-map (lambda (target)
                  (map (lambda (package)
                         (package-cross-job store (job-name package)
                                            package target system))
                       %packages-to-cross-build))
                %cross-targets))

  ;; Return one job for each package, except bootstrap packages.
  (let ((base-packages (delete-duplicates
                        (append-map (match-lambda
                                     ((_ package _ ...)
                                      (match (package-transitive-inputs
                                              package)
                                        (((_ inputs _ ...) ...)
                                         inputs))))
                                    %final-inputs))))
    (append-map (lambda (system)
                  (case subset
                    ((all)
                     ;; Build everything.
                     (fold-packages (lambda (package result)
                                      (if (member package base-packages)
                                          result
                                          (cons (package-job store (job-name package)
                                                             package system)
                                                result)))
                                    (cross-jobs system)))
                    ((core)
                     ;; Build core packages only.
                     (append (map (lambda (package)
                                    (package-job store (job-name package)
                                                 package system))
                                  %core-packages)
                             (cross-jobs system)))
                    (else
                     (error "unknown subset" subset))))
                systems)))