Use BASH_COMMAND instead of history for empty command detection

Part of microsoft#143766

Author: Tyriar

src/vs/workbench/contrib/terminal/browser/media/shellIntegration-bash.sh

@@ -39,13 +39,6 @@ if [[ "$PROMPT_COMMAND" =~ .*(' '.*\;)|(\;.*' ').* ]]; then
 	builtin return
 fi
 
-# Disable shell integration if HISTCONTROL is set to erase duplicate entries as the exit code
-# reporting relies on the duplicates existing
-if [[ "$HISTCONTROL" =~ .*erasedups.* ]]; then
-	builtin unset VSCODE_SHELL_INTEGRATION
-	builtin return
-fi
-
 if [ -z "$VSCODE_SHELL_INTEGRATION" ]; then
 	builtin return
 fi
@@ -56,7 +49,7 @@ __vsc_original_PS2="$PS2"
 __vsc_custom_PS1=""
 __vsc_custom_PS2=""
 __vsc_in_command_execution="1"
-__vsc_last_history_id=$(history 1 | awk '{print $1;}')
+__vsc_current_command=""
 
 __vsc_prompt_start() {
 	builtin printf "\033]633;A\007"
@@ -72,6 +65,13 @@ __vsc_update_cwd() {
 
 __vsc_command_output_start() {
 	builtin printf "\033]633;C\007"
+	if [[ ! "$BASH_COMMAND" =~ ^__vsc_prompt* ]]; then
+		__vsc_current_command=$BASH_COMMAND
+		builtin printf "\033]633;E;$BASH_COMMAND\007"
+	else
+		__vsc_current_command=""
+		builtin printf "\033]633;E\007"
+	fi
 }
 
 __vsc_continuation_start() {
@@ -83,12 +83,10 @@ __vsc_continuation_end() {
 }
 
 __vsc_command_complete() {
-	local __vsc_history_id=$(builtin history 1 | awk '{print $1;}')
-	if [[ "$__vsc_history_id" == "$__vsc_last_history_id" ]]; then
+	if [ "$__vsc_current_command" = "" ]; then
 		builtin printf "\033]633;D\007"
 	else
 		builtin printf "\033]633;D;%s\007" "$__vsc_status"
-		__vsc_last_history_id=$__vsc_history_id
 	fi
 	__vsc_update_cwd
 }