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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 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 scripts import hackage)
+ #:use-module (guix ui)
+ #:use-module (guix utils)
+ #:use-module (guix import hackage)
+ #:use-module (guix scripts import)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-11)
+ #:use-module (srfi srfi-37)
+ #:use-module (ice-9 match)
+ #:use-module (ice-9 format)
+ #:export (guix-import-hackage))
+
+
+;;;
+;;; Command-line options.
+;;;
+
+(define %default-options
+ '((include-test-dependencies? . #t)))
+
+(define (show-help)
+ (display (_ "Usage: guix import hackage PACKAGE-NAME
+Import and convert the Hackage package for PACKAGE-NAME. If PACKAGE-NAME
+includes a suffix constituted by a dash followed by a numerical version (as
+used with Guix packages), then a definition for the specified version of the
+package will be generated. If no version suffix is pecified, then the
+generated package definition will correspond to the latest available
+version.\n"))
+ (display (_ "
+ -h, --help display this help and exit"))
+ (display (_ "
+ -t, --no-test-dependencies don't include test only dependencies"))
+ (display (_ "
+ -V, --version display version information and exit"))
+ (newline)
+ (show-bug-report-information))
+
+(define %options
+ ;; Specification of the command-line options.
+ (cons* (option '(#\h "help") #f #f
+ (lambda args
+ (show-help)
+ (exit 0)))
+ (option '(#\V "version") #f #f
+ (lambda args
+ (show-version-and-exit "guix import hackage")))
+ (option '(#\t "no-test-dependencies") #f #f
+ (lambda (opt name arg result)
+ (alist-cons 'include-test-dependencies? #f
+ (alist-delete 'include-test-dependencies?
+ result))))
+ %standard-import-options))
+
+
+;;;
+;;; Entry point.
+;;;
+
+(define (guix-import-hackage . args)
+ (define (parse-options)
+ ;; Return the alist of option values.
+ (args-fold* args %options
+ (lambda (opt name arg result)
+ (leave (_ "~A: unrecognized option~%") name))
+ (lambda (arg result)
+ (alist-cons 'argument arg result))
+ %default-options))
+
+ (let* ((opts (parse-options))
+ (args (filter-map (match-lambda
+ (('argument . value)
+ value)
+ (_ #f))
+ (reverse opts))))
+ (match args
+ ((package-name)
+ (let ((sexp (hackage->guix-package
+ package-name
+ #:include-test-dependencies?
+ (assoc-ref opts 'include-test-dependencies?))))
+ (unless sexp
+ (leave (_ "failed to download cabal file for package '~a'~%")
+ package-name))
+ sexp))
+ (()
+ (leave (_ "too few arguments~%")))
+ ((many ...)
+ (leave (_ "too many arguments~%"))))))