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;;; 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 ui)
#:use-module (guix utils)
#:use-module (guix store)
#:use-module (guix config)
#:use-module (guix packages)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:export (_
N_
leave
show-version-and-exit
call-with-error-handling
with-error-handling))
;;; Commentary:
;;;
;;; User interface facilities for command-line tools.
;;;
;;; Code:
(define %gettext-domain
"guix")
(define _ (cut gettext <> %gettext-domain))
(define N_ (cut ngettext <> <> <> %gettext-domain))
(define-syntax-rule (leave fmt args ...)
"Format FMT and ARGS to the error port and exit."
(begin
(format (current-error-port) fmt args ...)
(exit 1)))
(define* (show-version-and-exit #:optional (command (car (command-line))))
"Display version information for COMMAND and `(exit 0)'."
(simple-format #t "~a (~a) ~a~%"
command %guix-package-name %guix-version)
(exit 0))
(define (call-with-error-handling thunk)
"Call THUNK within a user-friendly error handler."
(guard (c ((package-input-error? c)
(let* ((package (package-error-package c))
(input (package-error-invalid-input c))
(location (package-location package))
(file (location-file location))
(line (location-line location))
(column (location-column location)))
(leave (_ "~a:~a:~a: error: package `~a' has an invalid input: ~s~%")
file line column
(package-full-name package) input)))
((nix-protocol-error? c)
;; FIXME: Server-provided error messages aren't i18n'd.
(leave (_ "error: build failed: ~a~%")
(nix-protocol-error-message c))))
(thunk)))
(define-syntax with-error-handling
(syntax-rules ()
"Run BODY within a user-friendly error condition handler."
((_ body ...)
(call-with-error-handling
(lambda ()
body ...)))))
;;; ui.scm ends here
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