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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 Federico Beffa <beffa@fbengineering.ch>
;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.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 stackage)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (guix import json)
#:use-module (guix import hackage)
#:use-module (guix import utils)
#:use-module (guix memoization)
#:use-module (guix packages)
#:use-module (guix upstream)
#:export (stackage->guix-package
stackage-recursive-import
%stackage-updater))
;;;
;;; Stackage info fetcher and access functions
;;;
(define %stackage-url "http://www.stackage.org")
(define (lts-info-ghc-version lts-info)
"Returns the version of the GHC compiler contained in LTS-INFO."
(and=> (assoc-ref lts-info "snapshot")
(cut assoc-ref <> "ghc")))
(define (lts-info-packages lts-info)
"Returns the alist of packages contained in LTS-INFO."
(or (assoc-ref lts-info "packages") '()))
(define (leave-with-message fmt . args)
(raise (condition (&message (message (apply format #f fmt args))))))
(define stackage-lts-info-fetch
;; "Retrieve the information about the LTS Stackage release VERSION."
(memoize
(lambda* (#:optional (version ""))
(let* ((url (if (string=? "" version)
(string-append %stackage-url "/lts")
(string-append %stackage-url "/lts-" version)))
(lts-info (json-fetch url)))
(if lts-info
(reverse lts-info)
(leave-with-message "LTS release version not found: ~a" version))))))
(define (stackage-package-name pkg-info)
(assoc-ref pkg-info "name"))
(define (stackage-package-version pkg-info)
(assoc-ref pkg-info "version"))
(define (lts-package-version pkgs-info name)
"Return the version of the package with upstream NAME included in PKGS-INFO."
(let ((pkg (find (lambda (pkg) (string=? (stackage-package-name pkg) name))
(vector->list pkgs-info))))
(stackage-package-version pkg)))
;;;
;;; Importer entry point
;;;
(define (hackage-name-version name version)
(and version (string-append name "@" version)))
(define stackage->guix-package
(memoize
(lambda* (package-name ; upstream name
#:key
(include-test-dependencies? #t)
(lts-version "")
(packages-info
(lts-info-packages
(stackage-lts-info-fetch lts-version))))
"Fetch Cabal file for PACKAGE-NAME from hackage.haskell.org. The retrieved
version corresponds to the version of PACKAGE-NAME specified in the LTS-VERSION
release at stackage.org. Return the `package' S-expression corresponding to
that package, or #f on failure. PACKAGES-INFO is the alist with the packages
included in the Stackage LTS release."
(let* ((version (lts-package-version packages-info package-name))
(name-version (hackage-name-version package-name version)))
(if name-version
(hackage->guix-package name-version
#:include-test-dependencies?
include-test-dependencies?)
(leave-with-message "~a: Stackage package not found" package-name))))))
(define (stackage-recursive-import package-name . args)
(recursive-import package-name #f
#:repo->guix-package (lambda (name repo)
(apply stackage->guix-package (cons name args)))
#:guix-name hackage-name->package-name))
;;;
;;; Updater
;;;
(define latest-lts-release
(let ((pkgs-info (mlambda () (lts-info-packages (stackage-lts-info-fetch)))))
(lambda* (package)
"Return an <upstream-source> for the latest Stackage LTS release of
PACKAGE or #f if the package is not included in the Stackage LTS release."
(let* ((hackage-name (guix-package->hackage-name package))
(version (lts-package-version (pkgs-info) hackage-name))
(name-version (hackage-name-version hackage-name version)))
(match (and=> name-version hackage-fetch)
(#f (format (current-error-port)
"warning: failed to parse ~a~%"
(hackage-cabal-url hackage-name))
#f)
(_ (let ((url (hackage-source-url hackage-name version)))
(upstream-source
(package (package-name package))
(version version)
(urls (list url))))))))))
(define %stackage-updater
(upstream-updater
(name 'stackage)
(description "Updater for Stackage LTS packages")
(pred hackage-package?)
(latest latest-lts-release)))
;;; stackage.scm ends here
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