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-rw-r--r--guix/import/gem.scm131
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 David Thompson <davet@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/>.
+
+(define-module (guix import gem)
+ #:use-module (ice-9 match)
+ #:use-module (ice-9 pretty-print)
+ #:use-module (rnrs bytevectors)
+ #:use-module (json)
+ #:use-module (web uri)
+ #:use-module (guix import utils)
+ #:use-module (guix import json)
+ #:use-module (guix packages)
+ #:use-module (guix licenses)
+ #:use-module (guix base32)
+ #:export (gem->guix-package))
+
+(define (rubygems-fetch name)
+ "Return an alist representation of the RubyGems metadata for the package NAME,
+or #f on failure."
+ (json-fetch
+ (string-append "https://rubygems.org/api/v1/gems/" name ".json")))
+
+(define (ruby-package-name name)
+ "Given the NAME of a package on RubyGems, return a Guix-compliant name for
+the package."
+ (if (string-prefix? "ruby-" name)
+ (snake-case name)
+ (string-append "ruby-" (snake-case name))))
+
+(define (hex-string->bytevector str)
+ "Convert the hexadecimal encoded string STR to a bytevector."
+ (define hex-char->int
+ (match-lambda
+ (#\0 0)
+ (#\1 1)
+ (#\2 2)
+ (#\3 3)
+ (#\4 4)
+ (#\5 5)
+ (#\6 6)
+ (#\7 7)
+ (#\8 8)
+ (#\9 9)
+ (#\a 10)
+ (#\b 11)
+ (#\c 12)
+ (#\d 13)
+ (#\e 14)
+ (#\f 15)))
+
+ (define (read-byte i)
+ (let ((j (* 2 i)))
+ (+ (hex-char->int (string-ref str (1+ j)))
+ (* (hex-char->int (string-ref str j)) 16))))
+
+ (let* ((len (/ (string-length str) 2))
+ (bv (make-bytevector len)))
+ (let loop ((i 0))
+ (if (= i len)
+ bv
+ (begin
+ (bytevector-u8-set! bv i (read-byte i))
+ (loop (1+ i)))))))
+
+(define (make-gem-sexp name version hash home-page description
+ dependencies licenses)
+ "Return the `package' s-expression for a Ruby package with the given NAME,
+VERSION, HASH, HOME-PAGE, DESCRIPTION, DEPENDENCIES, and LICENSES."
+ `(package
+ (name ,(ruby-package-name name))
+ (version ,version)
+ (source (origin
+ (method url-fetch)
+ (uri (rubygems-uri ,name version))
+ (sha256
+ (base32
+ ,(bytevector->nix-base32-string
+ (hex-string->bytevector hash))))))
+ (build-system ruby-build-system)
+ ,@(if (null? dependencies)
+ '()
+ `((propagated-inputs
+ (,'quasiquote
+ ,(map (lambda (name)
+ `(,name
+ (,'unquote
+ ,(string->symbol name))))
+ dependencies)))))
+ (synopsis ,description) ; nothing better to use
+ (description ,description)
+ (home-page ,home-page)
+ (license ,(match licenses
+ ((license) (license->symbol license))
+ (_ (map license->symbol licenses))))))
+
+(define* (gem->guix-package package-name #:optional version)
+ "Fetch the metadata for PACKAGE-NAME from rubygems.org, and return the
+`package' s-expression corresponding to that package, or #f on failure."
+ (let ((package (rubygems-fetch package-name)))
+ (and package
+ (let ((name (assoc-ref package "name"))
+ (version (assoc-ref package "version"))
+ (hash (assoc-ref package "sha"))
+ (description (assoc-ref package "info"))
+ (home-page (assoc-ref package "homepage_uri"))
+ (dependencies (map (lambda (dep)
+ (let ((name (assoc-ref dep "name")))
+ (if (string=? name "bundler")
+ "bundler" ; special case, no prefix
+ (ruby-package-name name))))
+ (assoc-ref* package "dependencies"
+ "runtime")))
+ (licenses (map string->license
+ (assoc-ref package "licenses"))))
+ (make-gem-sexp name version hash home-page
+ description dependencies licenses)))))