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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.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/>.
(define-module (guix import cpan)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:use-module (srfi srfi-1)
#:use-module (json)
#:use-module (guix hash)
#:use-module (guix store)
#:use-module (guix base32)
#:use-module ((guix download) #:select (download-to-store))
#:use-module (guix import utils)
#:use-module (guix import json)
#:export (cpan->guix-package))
;;; Commentary:
;;;
;;; Generate a package declaration template for the latest version of a CPAN
;;; module, using meta-data from metacpan.org.
;;;
;;; Code:
(define string->license
(match-lambda
;; List of valid values from https://metacpan.org/pod/CPAN::Meta::Spec.
;; Some licenses are excluded based on their absense from (guix licenses).
("agpl_3" 'agpl3)
;; apache_1_1
("apache_2_0" 'asl2.0)
;; artistic_1_0
;; artistic_2_0
("bsd" 'bsd-3)
("freebsd" 'bsd-2)
;; gfdl_1_2
("gfdl_1_3" 'fdl1.3+)
("gpl_1" 'gpl1)
("gpl_2" 'gpl2)
("gpl_3" 'gpl3)
("lgpl_2_1" 'lgpl2.1)
("lgpl_3_0" 'lgpl3)
("mit" 'x11)
;; mozilla_1_0
("mozilla_1_1" 'mpl1.1)
("openssl" 'openssl)
("perl_5" 'gpl1+) ;and Artistic 1
("qpl_1_0" 'qpl)
;; ssleay
;; sun
("zlib" 'zlib)
((x) (string->license x))
((lst ...) `(list ,@(map string->license lst)))
(_ #f)))
(define (module->name module)
"Transform a 'module' name into a 'release' name"
(regexp-substitute/global #f "::" module 'pre "-" 'post))
(define (cpan-fetch module)
"Return an alist representation of the CPAN metadata for the perl module MODULE,
or #f on failure. MODULE should be e.g. \"Test::Script\""
;; This API always returns the latest release of the module.
(json-fetch (string-append "http://api.metacpan.org/release/"
;; XXX: The 'release' api requires the "release"
;; name of the package. This substitution seems
;; reasonably consistent across packages.
(module->name module))))
(define (cpan-home name)
(string-append "http://search.cpan.org/dist/" name))
(define (cpan-module->sexp meta)
"Return the `package' s-expression for a CPAN module from the metadata in
META."
(define name
(assoc-ref meta "distribution"))
(define (guix-name name)
(if (string-prefix? "perl-" name)
(string-downcase name)
(string-append "perl-" (string-downcase name))))
(define version
(assoc-ref meta "version"))
(define (convert-inputs phases)
;; Convert phase dependencies into a list of name/variable pairs.
(match (flatten
(map (lambda (ph)
(filter-map (lambda (t)
(assoc-ref* meta "metadata" "prereqs" ph t))
'("requires" "recommends" "suggests")))
phases))
(#f
'())
((inputs ...)
(delete-duplicates
;; Listed dependencies may include core modules. Filter those out.
(filter-map (match-lambda
((or (module . "0") ("perl" . _))
;; TODO: A stronger test might to run MODULE through
;; `corelist' from our perl package. This current test
;; seems to be only a loose convention.
#f)
((module . _)
(let ((name (guix-name (module->name module))))
(list name
(list 'unquote (string->symbol name))))))
inputs)))))
(define (maybe-inputs guix-name inputs)
(match inputs
(()
'())
((inputs ...)
(list (list guix-name
(list 'quasiquote inputs))))))
(define source-url
(assoc-ref meta "download_url"))
(let ((tarball (with-store store
(download-to-store store source-url))))
`(package
(name ,(guix-name name))
(version ,version)
(source (origin
(method url-fetch)
(uri (string-append ,@(factorize-uri source-url version)))
(sha256
(base32
,(bytevector->nix-base32-string (file-sha256 tarball))))))
(build-system perl-build-system)
,@(maybe-inputs 'native-inputs
;; "runtime" and "test" may also be needed here. See
;; https://metacpan.org/pod/CPAN::Meta::Spec#Phases,
;; which says they are required during building. We
;; have not yet had a need for cross-compiled perl
;; modules, however, so we leave them out.
(convert-inputs '("configure" "build")))
,@(maybe-inputs 'inputs
(convert-inputs '("runtime")))
(home-page ,(string-append "http://search.cpan.org/dist/" name))
(synopsis ,(assoc-ref meta "abstract"))
(description fill-in-yourself!)
(license ,(string->license (assoc-ref meta "license"))))))
(define (cpan->guix-package module-name)
"Fetch the metadata for PACKAGE-NAME from metacpan.org, and return the
`package' s-expression corresponding to that package, or #f on failure."
(let ((module-meta (cpan-fetch module-name)))
(and=> module-meta cpan-module->sexp)))