env.nix: export HISTFILE only if ~/.history exists

1 files changed, 3 insertions, 1 deletions

diff --git a/env.nix b/env.nix
index 55d735c..0377835 100644
--- a/env.nix
+++ b/env.nix
@@ -10,7 +10,9 @@ let
   ];
 
   extraCmds = ''
-    export HISTFILE="\$HOME/.history/env-${name}"
+    if test -d "\$HOME/.history"; then
+      export HISTFILE="\$HOME/.history/env-${name}"
+    fi
     $(grep export ${hsEnv.outPath}/bin/ghc)
   '';