From 1d757292d0cb78beec32fcdfe15c2944a4bc4a95 Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Sun, 13 Jan 2019 12:43:46 -0500
Subject: Add builtins.getContext.

This can be very helpful when debugging, as well as enabling complex
black magic like surgically removing a single dependency from a
string's context.
---
 src/libexpr/eval.hh | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/libexpr/eval.hh')

diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index d0f298e168e9..9fe3878916d5 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -316,6 +316,9 @@ private:
 /* Return a string representing the type of the value `v'. */
 string showType(const Value & v);
 
+/* Decode a context string ‘!<name>!<path>’ into a pair <path,
+   name>. */
+std::pair<string, string> decodeContext(const string & s);
 
 /* If `path' refers to a directory, then append "/default.nix". */
 Path resolveExprPath(Path path);
-- 
cgit 1.4.1