From 4dfdb27e001eceb66170757dabc0d7e3ed61ca3d Mon Sep 17 00:00:00 2001
From: Dan Peebles <pumpkin@me.com>
Date: Mon, 15 Aug 2016 13:54:23 -0400
Subject: [PATCH] lib.{warn, info}: add simple helpers
See also https://github.com/NixOS/nix/issues/749.
---
lib/trivial.nix | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/lib/trivial.nix b/lib/trivial.nix
index 21642ca0bdc..25ce35570fd 100644
--- a/lib/trivial.nix
+++ b/lib/trivial.nix
@@ -98,4 +98,19 @@ rec {
*/
importJSON = path:
builtins.fromJSON (builtins.readFile path);
+
+ /* See https://github.com/NixOS/nix/issues/749. Eventually we'd like these
+ to expand to Nix builtins that carry metadata so that Nix can filter out
+ the INFO messages without parsing the message string.
+
+ Usage:
+ {
+ foo = lib.warn "foo is deprecated" oldFoo;
+ }
+
+ TODO: figure out a clever way to integrate location information from
+ something like __unsafeGetAttrPos.
+ */
+ warn = msg: builtins.trace "WARNING: ${msg}";
+ info = msg: builtins.trace "INFO: ${msg}";
}