;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org> ;;; ;;; 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) #: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) (show-bug-report-information)) (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)) (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~%"))))))