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* guix/deprecation.scm (public): New macro. (define-deprecated): Add (_ visibility variable replacement exp) clause. Honor VISIBILITY. (define-deprecated/public): New macro.
118 lines
4.4 KiB
Scheme
118 lines
4.4 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2019, 2020, 2021 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 deprecation)
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#:use-module (guix i18n)
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#:use-module (guix diagnostics)
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#:autoload (guix utils) (source-properties->location)
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#:export (define-deprecated
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define-deprecated/public
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define-deprecated/alias
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warn-about-deprecation))
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;;; Commentary:
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;;;
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;;; Provide a mechanism to mark bindings as deprecated.
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;;;
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;;; Code:
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(define* (warn-about-deprecation variable properties
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#:key replacement)
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(let ((location (and properties (source-properties->location properties))))
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(if replacement
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(warning location (G_ "'~a' is deprecated, use '~a' instead~%")
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variable replacement)
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(warning location (G_ "'~a' is deprecated~%")
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variable))))
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(define-syntax public (syntax-rules ())) ;private syntactic keyword
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(define-syntax define-deprecated
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(lambda (s)
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"Define a deprecated variable or procedure, along these lines:
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(define-deprecated foo bar 42)
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(define-deprecated old new)
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(define-deprecated (baz x y) qux (qux y x))
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This will write a deprecation warning to GUIX-WARNING-PORT."
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(syntax-case s ()
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((_ (proc formals ...) replacement body ...)
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#'(define-deprecated proc replacement
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(lambda* (formals ...) body ...)))
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((_ variable replacement exp)
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#'(define-deprecated private variable replacement exp))
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((_ visibility variable replacement exp)
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(identifier? #'variable)
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(with-syntax ((real (datum->syntax
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#'variable
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(symbol-append '%
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(syntax->datum #'variable)
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'/deprecated))))
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#`(begin
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(define real
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(begin
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(lambda () replacement) ;just to ensure it's bound
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exp))
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(define-syntax variable
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(lambda (s)
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(warn-about-deprecation 'variable (syntax-source s)
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#:replacement 'replacement)
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(syntax-case s ()
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((_ args (... ...))
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#'(real args (... ...)))
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(id
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(identifier? #'id)
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#'real))))
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;; When asking for public visibility, export both REAL and
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;; VARIABLE. Exporting REAL is useful when defining deprecated
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;; packages: there must be a public variable bound to a package
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;; so that the (guix discover) machinery finds it.
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#,(if (free-identifier=? #'visibility #'public)
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#'(export real variable)
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#'(begin)))))
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((_ variable alias)
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(identifier? #'alias)
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#'(define-deprecated variable alias alias)))))
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(define-syntax-rule (define-deprecated/public body ...)
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"Like 'define/deprecated', but export all the newly introduced bindings."
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(define-deprecated public body ...))
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(define-syntax-rule (define-deprecated/alias deprecated replacement)
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"Define as an alias a deprecated variable, procedure, or macro, along
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these lines:
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(define-deprecated/alias nix-server? store-connection?)
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where 'nix-server?' is the deprecated name for 'store-connection?'.
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This will write a deprecation warning to GUIX-WARNING-PORT."
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(define-syntax deprecated
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(lambda (s)
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(warn-about-deprecation 'deprecated (syntax-source s)
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#:replacement 'replacement)
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(syntax-case s ()
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((_ args (... ...))
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#'(replacement args (... ...)))
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(id
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(identifier? #'id)
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#'replacement)))))
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