125 lines
3.8 KiB
Scheme
125 lines
3.8 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix scripts import)
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#:use-module (guix ui)
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#:use-module (guix snix)
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#:use-module (guix utils)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-37)
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#:use-module (ice-9 match)
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#:use-module (ice-9 pretty-print)
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#:export (guix-import))
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;;;
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;;; Helper.
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;;;
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(define (newline-rewriting-port output)
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"Return an output port that rewrites strings containing the \\n escape
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to an actual newline. This works around the behavior of `pretty-print'
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and `write', which output these as \\n instead of actual newlines,
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whereas we want the `description' field to contain actual newlines
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rather than \\n."
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(define (write-string str)
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(let loop ((chars (string->list str)))
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(match chars
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(()
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#t)
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((#\\ #\n rest ...)
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(newline output)
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(loop rest))
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((chr rest ...)
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(write-char chr output)
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(loop rest)))))
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(make-soft-port (vector (cut write-char <>)
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write-string
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(lambda _ #t) ; flush
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#f
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(lambda _ #t) ; close
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#f)
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"w"))
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;;;
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;;; Command-line options.
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;;;
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(define %default-options
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'())
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(define (show-help)
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(display (_ "Usage: guix import NIXPKGS ATTRIBUTE
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Import and convert the Nix expression ATTRIBUTE of NIXPKGS.\n"))
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(display (_ "
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-h, --help display this help and exit"))
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(display (_ "
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-V, --version display version information and exit"))
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(newline)
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(show-bug-report-information))
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(define %options
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;; Specification of the command-line options.
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(list (option '(#\h "help") #f #f
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(lambda args
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(show-help)
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(exit 0)))
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(option '(#\V "version") #f #f
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(lambda args
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(show-version-and-exit "guix-import")))))
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;;;
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;;; Entry point.
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;;;
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(define (guix-import . args)
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(define (parse-options)
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;; Return the alist of option values.
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(args-fold args %options
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(lambda (opt name arg result)
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(leave (_ "~A: unrecognized option~%") name))
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(lambda (arg result)
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(alist-cons 'argument arg result))
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%default-options))
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(install-locale)
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(textdomain "guix")
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(setvbuf (current-output-port) _IOLBF)
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(setvbuf (current-error-port) _IOLBF)
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(let* ((opts (parse-options))
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(args (filter-map (match-lambda
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(('argument . value)
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value)
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(_ #f))
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(reverse opts))))
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(match args
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((nixpkgs attribute)
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(let-values (((expr loc)
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(nixpkgs->guix-package nixpkgs attribute)))
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(format #t ";; converted from ~a:~a~%~%"
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(location-file loc) (location-line loc))
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(pretty-print expr (newline-rewriting-port (current-output-port)))))
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(_
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(leave (_ "wrong number of arguments~%"))))))
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