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authorEric Bavier <bavier@member.fsf.org>2015-01-08 14:51:13 -0600
committerEric Bavier <bavier@member.fsf.org>2015-01-09 10:38:26 -0600
commitd45dc6da5c802024f31dba95919c06205c5e31e4 (patch)
treecea230023a562edb0fc474eb47cc92692926ad25 /guix/import
parent694b317c2dfac5f8b284a5831e20d89cc112bd6b (diff)
import: Add CPAN importer.
* guix/import/cpan.scm, guix/scripts/import/cpan.scm, tests/cpan.scm: New files. * Makefile.am (MODULE)[HAVE_GUILE_JSON]: Add them. * guix/scripts/import.scm (importers): Add cpan. * doc/guix.texi (Requirements): Mention `guix import cpan` as a user of guile-json. (Invoking guix import): Document new `guix import cpan` command.
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diff --git a/guix/import/cpan.scm b/guix/import/cpan.scm
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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)))