From 54ccd1efb97445c07c233cadd43ab77a1d639a57 Mon Sep 17 00:00:00 2001
From: Doncho Gunchev <dgunchev@gmail.com>
Date: Sat, 17 Oct 2020 12:22:46 +0300
Subject: [PATCH] Don't add our prompt_command twice, also prepend

During testing if you source it twice you get
that problem now.

The error code formatting/logging gets broken if
we run prompt_command after other stuff. Running
anything external obviously resets $?.
---
 bash/ps-twtty-7.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/bash/ps-twtty-7.sh b/bash/ps-twtty-7.sh
index 7ae24ce..ba3e894 100755
--- a/bash/ps-twtty-7.sh
+++ b/bash/ps-twtty-7.sh
@@ -154,7 +154,10 @@ ${C2})${C3}\$${NO_COLOUR} "
 	if [ -z "${PROMPT_COMMAND}" ]; then
 		export PROMPT_COMMAND=prompt_command
 	else
-		export PROMPT_COMMAND="${PROMPT_COMMAND}; prompt_command"
+		if ! echo "${PROMPT_COMMAND}" | grep '\bprompt_command\b' > /dev/null 2>&1; then
+			export PROMPT_COMMAND="prompt_command
+${PROMPT_COMMAND}"
+		fi
 	fi
 	trap prompt_command_exit EXIT
 	shopt -s cmdhist histappend