From 5daa0345916cea13ae0e82ddf7b03f58503910f8 Mon Sep 17 00:00:00 2001
From: Mark Allen <mrallen1@yahoo.com>
Date: Tue, 25 Jul 2017 18:48:44 -0500
Subject: Fix up activation/deactivation

---
 kerl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kerl b/kerl
index abbe93f..32b01db 100755
--- a/kerl
+++ b/kerl
@@ -904,9 +904,12 @@ ACTIVATE_CSH
     if [ $otpver -ge 20 ]; then
         # https://twitter.com/mononcqc/status/877544929496629248
         cat << OTP_20_ADDITION >> "$absdir/activate"
-_KERL_SAVED_ERL_AFLAGS="\$ERL_AFLAGS"
+_KERL_SAVED_ERL_AFLAGS=" \$ERL_AFLAGS"
 export _KERL_SAVED_ERL_AFLAGS
-export ERL_AFLAGS="-kernel shell_history enabled \$ERL_AFLAGS"
+kernel_history=\$(echo "\$ERL_AFLAGS" | grep "kernel shell_history")
+if [ -z "\$kernel_history" ]; then
+    export ERL_AFLAGS="-kernel shell_history enabled \$ERL_AFLAGS"
+fi
 OTP_20_ADDITION
     fi
 
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