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-rw-r--r--guix/deprecation.scm22
1 files changed, 20 insertions, 2 deletions
diff --git a/guix/deprecation.scm b/guix/deprecation.scm
index 04d4d4a337..c66c9367f6 100644
--- a/guix/deprecation.scm
+++ b/guix/deprecation.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2019, 2020 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -21,6 +21,8 @@
#:use-module (guix diagnostics)
#:autoload (guix utils) (source-properties->location)
#:export (define-deprecated
+
+ define-deprecated/public
define-deprecated/alias
warn-about-deprecation))
@@ -39,6 +41,8 @@
(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:
@@ -53,6 +57,8 @@ This will write a deprecation warning to GUIX-WARNING-PORT."
#'(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
@@ -74,11 +80,23 @@ This will write a deprecation warning to GUIX-WARNING-PORT."
#'(real args (... ...)))
(id
(identifier? #'id)
- #'real)))))))
+ #'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: