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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Mathieu Lirzin <mthl@gnu.org>
;;; Copyright © 2017 Christopher Baines <mail@cbaines.net>
;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
;;; Copyright © 2020 Hartmut Goebel <h.goebel@crazy-compilers.com>
;;;
;;; 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 hexpm-download)
#:use-module (ice-9 match)
#:use-module (guix extracting-download)
#:use-module (guix packages) ;; for %current-system
#:use-module (srfi srfi-26)
#:export (hexpm-fetch
%hexpm-repo-url
hexpm-url
hexpm-url?
hexpm-uri))
;;;
;;; An <origin> method that fetches a package from the hex.pm repository,
;;; unwrapping the actual content from the download tarball.
;;;
;; URL and paths from
;; https://github.com/hexpm/specifications/blob/master/endpoints.md
(define %hexpm-repo-url
(make-parameter "https://repo.hex.pm"))
(define hexpm-url
(string-append (%hexpm-repo-url) "/tarballs/"))
(define hexpm-url?
(cut string-prefix? hexpm-url <>))
(define (hexpm-uri name version)
"Return a URI string for the package hosted at hex.pm corresponding to NAME
and VERSION."
(string-append hexpm-url name "-" version ".tar"))
(define* (hexpm-fetch url hash-algo hash
#:optional name
#:key
(filename-to-extract "contents.tar.gz")
(system (%current-system))
(guile (default-guile)))
"Return a fixed-output derivation that fetches URL and extracts
\"contents.tar.gz\". The output is expected to have hash HASH of type
HASH-ALGO (a symbol). By default, the file name is the base name of URL;
optionally, NAME can specify a different file name. By default, the file name
is the base name of URL with \".gz\" appended; optionally, NAME can specify a
different file name."
(define file-name
(match url
((head _ ...)
(basename head))
(_
(basename url))))
(http-fetch/extract url "contents.tar.gz" hash-algo hash
;; urls typically end with .tar, but contents is .tar.gz
(or name (string-append file-name ".gz"))
#:system system #:guile guile))
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