From ec49ea28dc5309c8905fc4385fb65ec7a88b33f6 Mon Sep 17 00:00:00 2001
From: Ivan Kozik <ivan@ludios.org>
Date: Tue, 7 Aug 2018 03:40:44 +0000
Subject: [PATCH] repl: don't add trailing spaces to history lines

---
 src/nix/repl.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/nix/repl.cc b/src/nix/repl.cc
index 1eb716006..b71e6f905 100644
--- a/src/nix/repl.cc
+++ b/src/nix/repl.cc
@@ -173,9 +173,14 @@ void NixRepl::mainLoop(const std::vector<std::string> & files)
             printMsg(lvlError, format(error + "%1%%2%") % (settings.showTrace ? e.prefix() : "") % e.msg());
         }
 
+        if (input.size() > 0) {
+            // Remove trailing newline before adding to history
+            input.erase(input.size() - 1);
+            linenoiseHistoryAdd(input.c_str());
+        }
+
         // We handled the current input fully, so we should clear it
         // and read brand new input.
-        linenoiseHistoryAdd(input.c_str());
         input.clear();
         std::cout << std::endl;
     }