82 lines
2.9 KiB
Scheme
82 lines
2.9 KiB
Scheme
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2014 Deck Pickard <deck.r.pickard@gmail.com>
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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)
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#:use-module (guix utils)
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#:use-module (guix ui)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-37)
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#:use-module (ice-9 match)
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#:export (args-fold*
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parse-command-line))
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;;; Commentary:
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;;;
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;;; General code for Guix scripts.
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;;;
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;;; Code:
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(define (args-fold* options unrecognized-option-proc operand-proc . seeds)
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"A wrapper on top of `args-fold' that does proper user-facing error
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reporting."
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(catch 'misc-error
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(lambda ()
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(apply args-fold options unrecognized-option-proc
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operand-proc seeds))
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(lambda (key proc msg args . rest)
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;; XXX: MSG is not i18n'd.
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(leave (_ "invalid argument: ~a~%")
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(apply format #f msg args)))))
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(define (environment-build-options)
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"Return additional build options passed as environment variables."
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(arguments-from-environment-variable "GUIX_BUILD_OPTIONS"))
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(define %default-argument-handler
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;; The default handler for non-option command-line arguments.
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(lambda (arg result)
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(alist-cons 'argument arg result)))
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(define* (parse-command-line args options seeds
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#:key
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(argument-handler %default-argument-handler))
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"Parse the command-line arguments ARGS as well as arguments passed via the
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'GUIX_BUILD_OPTIONS' environment variable according to OPTIONS (a list of
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SRFI-37 options) and return the result, seeded by SEEDS.
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Command-line options take precedence those passed via 'GUIX_BUILD_OPTIONS'.
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ARGUMENT-HANDLER is called for non-option arguments, like the 'operand-proc'
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parameter of 'args-fold'."
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(define (parse-options-from args seeds)
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;; Actual parsing takes place here.
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(apply args-fold* args options
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(lambda (opt name arg . rest)
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(leave (_ "~A: unrecognized option~%") name))
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argument-handler
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seeds))
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(call-with-values
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(lambda ()
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(parse-options-from (environment-build-options) seeds))
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(lambda seeds
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;; ARGS take precedence over what the environment variable specifies.
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(parse-options-from args seeds))))
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;;; scripts.scm ends here
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