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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; 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 launchpad)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (web uri)
#:use-module ((guix download) #:prefix download:)
#:use-module (guix import json)
#:use-module (guix packages)
#:use-module (guix upstream)
#:use-module (guix utils)
#:export (%launchpad-updater))
(define (find-extension url)
"Return the extension of the archive e.g. '.tar.gz' given a URL, or
false if none is recognized"
(find (lambda (x) (string-suffix? x url))
(list ".tar.gz" ".tar.bz2" ".tar.xz"
".zip" ".tar" ".tgz" ".tbz" ".love")))
(define (updated-launchpad-url old-package new-version)
;; Return a url for the OLD-PACKAGE with NEW-VERSION. If no source url in
;; the OLD-PACKAGE is a Launchpad url, then return false.
(define (updated-url url)
(and (string-prefix? "https://launchpad.net/" url)
(let ((ext (or (find-extension url) ""))
(name (package-name old-package))
(version (package-version old-package))
(repo (launchpad-repository url)))
(cond
((and
(>= (length (string-split version #\.)) 2)
(string=? (string-append "https://launchpad.net/"
repo "/" (version-major+minor version)
"/" version "/+download/" repo "-" version ext)
url))
(string-append "https://launchpad.net/"
repo "/" (version-major+minor new-version)
"/" new-version "/+download/" repo "-" new-version ext))
(#t #f))))) ; Some URLs are not recognised.
(let ((source-uri (and=> (package-source old-package) origin-uri))
(fetch-method (and=> (package-source old-package) origin-method)))
(cond
((eq? fetch-method download:url-fetch)
(match source-uri
((? string?)
(updated-url source-uri))
((source-uri ...)
(find updated-url source-uri))))
(else #f))))
(define (launchpad-package? package)
"Return true if PACKAGE is a package from Launchpad, else false."
(->bool (updated-launchpad-url package "1.0.0")))
(define (launchpad-repository url)
"Return a string e.g. linuxdcpp of the name of the repository, from a string
URL of the form
'https://launchpad.net/linuxdcpp/1.1/1.1.0/+download/linuxdcpp-1.1.0.tar.bz2'"
(match (string-split (uri-path (string->uri url)) #\/)
((_ repo . rest) repo)))
(define (latest-released-version package-name)
"Return a string of the newest released version name given the PACKAGE-NAME,
for example, 'linuxdcpp'. Return #f if there is no releases."
(define (pre-release? x)
;; Versions containing anything other than digit characters and "." (for
;; example, "5.1.0-rc1") are assumed to be pre-releases.
(not (string-every (char-set-union (char-set #\.)
char-set:digit)
(hash-ref x "version"))))
(hash-ref
(last (remove
pre-release?
(hash-ref (json-fetch
(string-append "https://api.launchpad.net/1.0/"
package-name "/releases"))
"entries")))
"version"))
(define (latest-release pkg)
"Return an <upstream-source> for the latest release of PKG."
(define (origin-github-uri origin)
(match (origin-uri origin)
((? string? url) url) ; surely a Launchpad URL
((urls ...)
(find (cut string-contains <> "launchpad.net") urls))))
(let* ((source-uri (origin-github-uri (package-source pkg)))
(name (package-name pkg))
(newest-version (latest-released-version name)))
(if newest-version
(upstream-source
(package name)
(version newest-version)
(urls (list (updated-launchpad-url pkg newest-version))))
#f))) ; On Launchpad but no proper releases
(define %launchpad-updater
(upstream-updater
(name 'launchpad)
(description "Updater for Launchpad packages")
(pred launchpad-package?)
(latest latest-release)))
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