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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)
#:use-module (guix ui)
#: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 format)
#:use-module (ice-9 match)
#:use-module (ice-9 pretty-print)
#:export (%standard-import-options
;;; 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
((#\\ #\n rest ...)
(newline output)
(loop rest))
((chr rest ...)
(write-char chr output)
(loop rest)))))
(make-soft-port (vector (cut write-char <>)
(lambda _ #t) ; flush
(lambda _ #t) ; close
;;; Command line options.
(define %standard-import-options '())
;;; Entry point.
(define importers '("nix" "pypi"))
(define (resolve-importer name)
(let ((module (resolve-interface
`(guix scripts import ,(string->symbol name))))
(proc (string->symbol (string-append "guix-import-" name))))
(module-ref module proc)))
(define (show-help)
(display (_ "Usage: guix import IMPORTER ARGS ...
Run IMPORTER with ARGS.\n"))
(display (_ "IMPORTER must be one of the importers listed below:\n"))
(format #t "~{ ~a~%~}" importers)
(display (_ "
-h, --help display this help and exit"))
(display (_ "
-V, --version display version information and exit"))
(define (guix-import . args)
(match args
(format (current-error-port)
(_ "guix import: missing importer name~%")))
((or ("-h") ("--help"))
(exit 0))
(show-version-and-exit "guix import"))
((importer args ...)
(if (member importer importers)
(let ((expr (apply (resolve-importer importer) args)))
(pretty-print expr (newline-rewriting-port (current-output-port))))
(format (current-error-port)
(_ "guix import: invalid importer~%"))))))