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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Federico Beffa <beffa@fbengineering.ch>
+;;;
+;;; 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 (guix import json)
+ #:use-module (guix import hackage)
+ #:use-module (guix memoization)
+ #:use-module (guix packages)
+ #:use-module (guix upstream)
+ #:use-module (guix ui)
+ #:export (stackage->guix-package
+ %stackage-updater))
+
+
+;;;
+;;; Stackage info fetcher and access functions
+;;;
+
+(define %stackage-url "http://www.stackage.org")
+
+(define (lts-info-ghc-version lts-info)
+ "Retruns the version of the GHC compiler contained in LTS-INFO."
+ (match lts-info
+ ((("snapshot" ("ghc" . version) _ _) _) version)
+ (_ #f)))
+
+(define (lts-info-packages lts-info)
+ "Retruns the alist of packages contained in LTS-INFO."
+ (match lts-info
+ ((_ ("packages" pkg ...)) pkg)
+ (_ '())))
+
+(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 (_ "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))
+ 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 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
+vesion 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 (_ "package not found: ~A~%") 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 it the package is not inlucded 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