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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013 Ludovic Courtès <>
;;; Copyright © 2014 David Thompson <>
;;; 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
;;; 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 <>.
(define-module (guix scripts import nix)
#:use-module (guix ui)
#:use-module (guix utils)
#:use-module (guix import snix)
#: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)
#:export (guix-import-nix))
;;; Command-line options.
(define %default-options
(define (show-help)
(display (_ "Usage: guix import nix NIXPKGS ATTRIBUTE
Import and convert the Nix expression ATTRIBUTE of NIXPKGS.\n"))
(display (_ "
-h, --help display this help and exit"))
(display (_ "
-V, --version display version information and exit"))
(define %options
;; Specification of the command-line options.
(cons* (option '(#\h "help") #f #f
(lambda args
(exit 0)))
(option '(#\V "version") #f #f
(lambda args
(show-version-and-exit "guix import nix")))
;;; Entry point.
(define (guix-import-nix . 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))
(let* ((opts (parse-options))
(args (filter-map (match-lambda
(('argument . value)
(_ #f))
(reverse opts))))
(match args
((nixpkgs attribute)
(let-values (((expr loc)
(nixpkgs->guix-package nixpkgs attribute)))
(format #t ";; converted from ~a:~a~%~%"
(location-file loc) (location-line loc))
(leave (_ "wrong number of arguments~%"))))))