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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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
;;; 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix deprecation)
#:use-module (guix i18n)
#:use-module (guix diagnostics)
#:autoload (guix utils) (source-properties->location)
#:export (define-deprecated
define-deprecated/public
define-deprecated/alias
warn-about-deprecation))
;;; Commentary:
;;;
;;; Provide a mechanism to mark bindings as deprecated.
;;;
;;; Code:
(define* (warn-about-deprecation variable properties
#:key replacement)
(let ((location (and properties (source-properties->location properties))))
(if replacement
(warning location (G_ "'~a' is deprecated, use '~a' instead~%")
variable replacement)
(warning location (G_ "'~a' is deprecated~%")
variable))))
(define-syntax public (syntax-rules ())) ;private syntactic keyword
(define-syntax define-deprecated
(lambda (s)
"Define a deprecated variable or procedure, along these lines:
(define-deprecated foo bar 42)
(define-deprecated old new)
(define-deprecated (baz x y) qux (qux y x))
This will write a deprecation warning to GUIX-WARNING-PORT."
(syntax-case s ()
((_ (proc formals ...) replacement body ...)
#'(define-deprecated proc replacement
(lambda* (formals ...) body ...)))
((_ variable replacement exp)
#'(define-deprecated private variable replacement exp))
((_ visibility variable replacement exp)
(identifier? #'variable)
(with-syntax ((real (datum->syntax
#'variable
(symbol-append '%
(syntax->datum #'variable)
'/deprecated))))
#`(begin
(define real
(begin
(lambda () replacement) ;just to ensure it's bound
exp))
(define-syntax variable
(lambda (s)
(warn-about-deprecation 'variable (syntax-source s)
#:replacement 'replacement)
(syntax-case s ()
((_ args (... ...))
#'(real args (... ...)))
(id
(identifier? #'id)
#'real))))
;; When asking for public visibility, export both REAL and
;; VARIABLE. Exporting REAL is useful when defining deprecated
;; packages: there must be a public variable bound to a package
;; so that the (guix discover) machinery finds it.
#,(if (free-identifier=? #'visibility #'public)
#'(export real variable)
#'(begin)))))
((_ variable alias)
(identifier? #'alias)
#'(define-deprecated variable alias alias)))))
(define-syntax-rule (define-deprecated/public body ...)
"Like 'define/deprecated', but export all the newly introduced bindings."
(define-deprecated public body ...))
(define-syntax-rule (define-deprecated/alias deprecated replacement)
"Define as an alias a deprecated variable, procedure, or macro, along
these lines:
(define-deprecated/alias nix-server? store-connection?)
where 'nix-server?' is the deprecated name for 'store-connection?'.
This will write a deprecation warning to GUIX-WARNING-PORT."
(define-syntax deprecated
(lambda (s)
(warn-about-deprecation 'deprecated (syntax-source s)
#:replacement 'replacement)
(syntax-case s ()
((_ args (... ...))
#'(replacement args (... ...)))
(id
(identifier? #'id)
#'replacement)))))
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