Fix precision error

.prompt

@@ -4,11 +4,12 @@
 __debug_trap() {
 	# Set necessary pre-command variables (PROMPT_COMMAND is a command
 	# so its excluded here)
-	if [[ "$BASH_COMMAND" != "$PROMPT_COMMAND" ]]; then
-		LAST_EPOCH="$EPOCHSECONDS"
+	if [[ "$BASH_COMMAND" != "$PROMPT_COMMAND" &&
+	      "$LAST_BASH_COMMAND" == "$PROMPT_COMMAND" ]]; then
 		LAST_REALTIME="$EPOCHREALTIME"
 		INC_TIME=1
 	fi
+	LAST_BASH_COMMAND="$BASH_COMMAND"
 }
 
 trap '__debug_trap' DEBUG
@@ -73,19 +74,31 @@ __sig() {
 
 __prompt() {
 	# Get exit code
-	PEC=$?
+	local PEC=$?
 	# Reset time when prompt was first displayed after command
 	if [ $INC_TIME -ne 0 ]; then 
-		PROMPT_EPOCH="$EPOCHSECONDS"
 		PROMPT_REALTIME="$EPOCHREALTIME"
 		INC_TIME=0
 	fi
 
 	# Get relative times
-	CMD_TIME="$((PROMPT_EPOCH-LAST_EPOCH))"
+
+	# Remove decimal point, simulating multiplying by 1 million
+	PROMPT_RT1M="${PROMPT_REALTIME%.*}${PROMPT_REALTIME#*.}"
+	LAST_RT1M="${LAST_REALTIME%.*}${LAST_REALTIME#*.}"
+	# Subtract and divide by 1 million to get a more accurate difference
+	CMD_TIME="$(((PROMPT_RT1M-LAST_RT1M)/1000000))"
+
 	local LAST_US="$((10#${LAST_REALTIME: -6}))"
-	CMD_US="$((1${PROMPT_REALTIME: -6}-${LAST_US:-0}))"
-	CMD_US="$((10#${CMD_US: -6}))"
+	local LAST_US="${LAST_US:-0}"
+	local PROMPT_US="${PROMPT_REALTIME: -6}"
+	local PROMPT_US_CLN="$((10#$PROMPT_US))"
+	local PROMPT_US_CLN="${PROMPT_US_CLN:-0}"
+
+	[ $PROMPT_US_CLN -lt $LAST_US ] &&
+		CMD_US="$((1$PROMPT_US-$LAST_US))" ||
+		CMD_US="$(($PROMPT_US_CLN-$LAST_US))"
+	CMD_US="$((10#$CMD_US))"
 
 	# Set prompt sections