From 5c3b840df3897c216dafeb5f63a39ee12f63a804 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Mon, 12 Jun 2017 02:12:51 +0300
Subject: setenv: detect expandable values

---
 app/SetEnv.hs | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/app/SetEnv.hs b/app/SetEnv.hs
index d590f64..258bc2e 100644
--- a/app/SetEnv.hs
+++ b/app/SetEnv.hs
@@ -55,7 +55,7 @@ setEnv :: Options -> IO ()
 setEnv options = runExceptT doSetEnv >>= either ioError return
   where
     varName = optName options
-    varValue = WindowsEnv.Value False $ optValue options
+    varValue = optValue options
 
     forAllUsers = optGlobal options
     profile
@@ -63,10 +63,16 @@ setEnv options = runExceptT doSetEnv >>= either ioError return
         | otherwise   = WindowsEnv.CurrentUser
 
     skipPrompt = optYes options
-    promptAnd
-        | skipPrompt = withoutPrompt
-        | otherwise  = withPrompt $ newMessage profile varName varValue
 
-    engrave = WindowsEnv.engrave profile varName varValue
+    doSetEnv = do
+        expanded <- WindowsEnv.expand varValue
+        let expandable = expanded == varValue
+        let newValue = WindowsEnv.Value expandable varValue
+        promptAndEngrave newValue
 
-    doSetEnv = void $ promptAnd engrave
+    promptAndEngrave newValue = do
+        let promptAnd = if skipPrompt
+            then withoutPrompt
+            else withPrompt $ newMessage profile varName newValue
+        let engrave = WindowsEnv.engrave profile varName newValue
+        void $ promptAnd engrave
-- 
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