;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Petter <petter@mykolab.ch>
;;;
;;; 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-system go)
  #:use-module (guix store)
  #:use-module (guix utils)
  #:use-module (guix combinators)
  #:use-module (guix derivations)
  #:use-module (guix search-paths)
  #:use-module (guix build-system)
  #:use-module (guix packages)
  #:use-module (gnu packages base)
  #:use-module (gnu packages golang)
  #:use-module (srfi srfi-1)
  #:use-module (ice-9 match)
  #:export (%go-build-system-modules
            go-build
            go-build-system
            sourcestuff
            standard-packages))

;; Commentary:
;;
;; Standard build procedure for packages using the GNU Build System or
;; something compatible ("./configure && make && make install").
;;
;; Code:

(define %go-build-system-modules
  ;; Build-side modules imported and used by default.
  '((guix build go-build-system)
    (guix build utils)
    (guix build gremlin)
    (guix elf)))

(define %default-modules
  ;; Modules in scope in the build-side environment.
  '((guix build go-build-system)
    (guix build utils)))

(define* (lower name
                #:key source inputs native-inputs outputs target
                (implicit-inputs? #t) (implicit-cross-inputs? #t)
                (strip-binaries? #t) system
                #:allow-other-keys
                #:rest arguments)
  "Return a bag for NAME from the given arguments."
  (define private-keywords
    `(#:source #:inputs #:native-inputs #:outputs
      #:implicit-inputs? #:implicit-cross-inputs?
      ,@(if target '() '(#:target))))

  (bag
    (name name)
    (system system) (target target)
    (build-inputs `(,@(if source
                          `(("source" ,source)))
                    ("go" ,go)
                    ,@native-inputs))
    (host-inputs inputs)

    (build (if target gnu-cross-build go-build))
    (arguments (strip-keyword-arguments private-keywords arguments))))

(define* (go-build store name input-drvs
                    #:key (guile #f)
                    (outputs '("out"))
                    (search-paths '())
                    (configure-flags ''())
                    (make-flags ''())
                    (out-of-source? #f)
                    (tests? #t)
                    (import-path "")
                    (unpack-path "")
                    (test-target "check")
                    (parallel-build? #t)
                    (parallel-tests? #t)
                    (phases '%standard-phases)
                    (locale "en_US.utf8")
                    (system (%current-system))
                    (build (nix-system->gnu-triplet system))
                    (imported-modules %go-build-system-modules)
                    (modules %default-modules)
                    (substitutable? #t)
                    allowed-references
                    disallowed-references)
  "Return a derivation called NAME that builds from tarball SOURCE, with
input derivation INPUTS, using the usual procedure of the GNU Build
System.  The builder is run with GUILE, or with the distro's final Guile
package if GUILE is #f or omitted.

The builder is run in a context where MODULES are used; IMPORTED-MODULES
specifies modules not provided by Guile itself that must be imported in
the builder's environment, from the host.  Note that we distinguish
between both, because for Guile's own modules like (ice-9 foo), we want
to use GUILE's own version of it, rather than import the user's one,
which could lead to gratuitous input divergence.

SUBSTITUTABLE? determines whether users may be able to use substitutes of the
returned derivations, or whether they should always build it locally.

ALLOWED-REFERENCES can be either #f, or a list of packages that the outputs
are allowed to refer to.  Likewise for DISALLOWED-REFERENCES, which lists
packages that must not be referenced."
  (define canonicalize-reference
    (match-lambda
     ((? package? p)
      (derivation->output-path (package-derivation store p system
                                                   #:graft? #f)))
     (((? package? p) output)
      (derivation->output-path (package-derivation store p system
                                                   #:graft? #f)
                               output))
     ((? string? output)
      output)))

  (define builder
    `(begin
       (use-modules ,@modules)
       (go-build #:source ,(match (assoc-ref input-drvs "source")
                              (((? derivation? source))
                               (derivation->output-path source))
                              ((source)
                               source)
                              (source
                               source))
                 #:import-path ,import-path
                 #:unpack-path ,unpack-path
                  #:system ,system
                  #:build ,build
                  #:outputs %outputs
                  #:inputs %build-inputs
                  #:search-paths ',(map search-path-specification->sexp
                                        search-paths)
                  #:phases ,phases
                  #:locale ,locale
                  #:configure-flags ,configure-flags
                  #:make-flags ,make-flags
                  #:out-of-source? ,out-of-source?
                  #:tests? ,tests?
                  #:test-target ,test-target
                  #:parallel-build? ,parallel-build?
                  #:parallel-tests? ,parallel-tests?)))

  (define guile-for-build
    (match guile
      ((? package?)
       (package-derivation store guile system #:graft? #f))
      (#f                                         ; the default
       (let* ((distro (resolve-interface '(gnu packages commencement)))
              (guile  (module-ref distro 'guile-final)))
         (package-derivation store guile system
                             #:graft? #f)))))

  (build-expression->derivation store name builder
                                #:system system
                                #:inputs input-drvs
                                #:outputs outputs
                                #:modules imported-modules
                                #:substitutable? substitutable?

                                #:allowed-references
                                (and allowed-references
                                     (map canonicalize-reference
                                          allowed-references))
                                #:disallowed-references
                                (and disallowed-references
                                     (map canonicalize-reference
                                          disallowed-references))
                                #:guile-for-build guile-for-build))


(define go-build-system
  (build-system
    (name 'go)
    (description
     "The GO Build System")
    (lower lower)))