From b4b67177b53c23c6fb77aea7f0bc5c559f8bebe5 Mon Sep 17 00:00:00 2001
From: Tad Fisher <tadfisher@gmail.com>
Date: Mon, 17 Dec 2018 15:42:41 -0800
Subject: [PATCH] nixos/bash: Fix prompt regression in Emacs term mode

---
 nixos/modules/programs/bash/bash.nix | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/programs/bash/bash.nix b/nixos/modules/programs/bash/bash.nix
index 2b01c9d26c41..d22f9dfa3199 100644
--- a/nixos/modules/programs/bash/bash.nix
+++ b/nixos/modules/programs/bash/bash.nix
@@ -98,7 +98,12 @@ in
           if [ "$TERM" != "dumb" -o -n "$INSIDE_EMACS" ]; then
             PROMPT_COLOR="1;31m"
             let $UID && PROMPT_COLOR="1;32m"
-            PS1="\n\[\033[$PROMPT_COLOR\][\[\e]0;\u@\h: \w\a\]\u@\h:\w]\$\[\033[0m\] "
+            if [ -n "$INSIDE_EMACS" ]; then
+              # Emacs term mode doesn't support xterm title escape sequence (\e]0;)
+              PS1="\n\[\033[$PROMPT_COLOR\][\u@\h:\w]\\$\[\033[0m\] "
+            else
+              PS1="\n\[\033[$PROMPT_COLOR\][\[\e]0;\u@\h: \w\a\]\u@\h:\w]\$\[\033[0m\] "
+            fi
             if test "$TERM" = "xterm"; then
               PS1="\[\033]2;\h:\u:\w\007\]$PS1"
             fi