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+#!/bin/sh
+# aside from this initial boilerplate, this is actually -*- scheme -*- code
+
+prefix="@prefix@"
+datarootdir="@datarootdir@"
+
+GUILE_LOAD_COMPILED_PATH="@guilemoduledir@:$GUILE_LOAD_COMPILED_PATH"
+export GUILE_LOAD_COMPILED_PATH
+
+main='(module-ref (resolve-interface '\''(guix-import)) '\'guix-import')'
+exec ${GUILE-@GUILE@} -L "@guilemoduledir@" -l "$0" \
+ -c "(apply $main (cdr (command-line)))" "$@"
+!#
+;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
+;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of Guix.
+;;;
+;;; 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.
+;;;
+;;; 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 Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix-import)
+ #:use-module (guix ui)
+ #:use-module (guix snix)
+ #:use-module (guix utils)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-11)
+ #:use-module (srfi srfi-26)
+ #:use-module (srfi srfi-37)
+ #:use-module (ice-9 match)
+ #:use-module (ice-9 pretty-print)
+ #:export (guix-import))
+
+
+;;;
+;;; Helper.
+;;;
+
+(define (newline-rewriting-port output)
+ "Return an output port that rewrites strings containing the \\n escape
+to an actual newline. This works around the behavior of `pretty-print'
+and `write', which output these as \\n instead of actual newlines,
+whereas we want the `description' field to contain actual newlines
+rather than \\n."
+ (define (write-string str)
+ (let loop ((chars (string->list str)))
+ (match chars
+ (()
+ #t)
+ ((#\\ #\n rest ...)
+ (newline output)
+ (loop rest))
+ ((chr rest ...)
+ (write-char chr output)
+ (loop rest)))))
+
+ (make-soft-port (vector (cut write-char <>)
+ write-string
+ (lambda _ #t) ; flush
+ #f
+ (lambda _ #t) ; close
+ #f)
+ "w"))
+
+
+;;;
+;;; Command-line options.
+;;;
+
+(define %default-options
+ '())
+
+(define (show-help)
+ (display (_ "Usage: guix-import 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"))
+ (newline)
+ (format #t (_ "
+Report bugs to: ~a.~%") "@PACKAGE_BUGREPORT@"))
+
+(define %options
+ ;; Specification of the command-line options.
+ (list (option '(#\h "help") #f #f
+ (lambda args
+ (show-help)
+ (exit 0)))
+ (option '(#\V "version") #f #f
+ (lambda args
+ (show-version-and-exit "guix-import")))))
+
+
+;;;
+;;; Entry point.
+;;;
+
+(define (guix-import . 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))
+
+ (setlocale LC_ALL "")
+ (textdomain "guix")
+ (setvbuf (current-output-port) _IOLBF)
+ (setvbuf (current-error-port) _IOLBF)
+
+ (let* ((opts (parse-options))
+ (args (filter-map (match-lambda
+ (('argument . value)
+ 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))
+ (pretty-print expr (newline-rewriting-port (current-output-port)))))
+ (_
+ (leave (_ "wrong number of arguments~%"))))))