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01/06: deprecation: Add 'define-deprecated/alias'.


From: guix-commits
Subject: 01/06: deprecation: Add 'define-deprecated/alias'.
Date: Mon, 21 Jan 2019 17:21:47 -0500 (EST)

civodul pushed a commit to branch master
in repository guix.

commit 1b7dd99738f17d3e3ebc29500bc475f9dd214ba3
Author: Ludovic Court├Ęs <address@hidden>
Date:   Mon Jan 21 15:30:14 2019 +0100

    deprecation: Add 'define-deprecated/alias'.
    
    * guix/deprecation.scm (define-deprecated/alias): New macro.
---
 guix/deprecation.scm | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/guix/deprecation.scm b/guix/deprecation.scm
index 453aad7..8d9e427 100644
--- a/guix/deprecation.scm
+++ b/guix/deprecation.scm
@@ -20,7 +20,7 @@
   #:use-module (guix i18n)
   #:use-module (ice-9 format)
   #:export (define-deprecated
-            without-deprecation-warnings
+            define-deprecated/alias
             deprecation-warning-port))
 
 ;;; Commentary:
@@ -87,3 +87,23 @@ This will write a deprecation warning to 
DEPRECATION-WARNING-PORT."
                    (id
                     (identifier? #'id)
                     #'real))))))))))
+
+(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 DEPRECATION-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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