Avoid showing the 130 error code after hitting ^C

When a user hits ^C on command line to cancel entering a lengthy command,
$! in __lp_set_prompt is set to 130 (128 + SIGINT). Displaying this error
on the input line (especially in warning colours) makes little sense.
Therefore, liquidprompt should check if the command submitted is a real
command or is it part of PROMPT_COMMAND in which case the error does
not come from a user's command and should not be presented.

liquidprompt

@@ -486,6 +486,7 @@ __lp_source_config() {
     LP_ENABLE_OS_VERSION=${LP_ENABLE_OS_VERSION:-1}
     LP_ENABLE_HYPERLINKS=${LP_ENABLE_HYPERLINKS:-0}
     LP_ENABLE_PATH=${LP_ENABLE_PATH:-1}
+    LP_HIDE_EMPTY_ERROR=${LP_HIDE_EMPTY_ERROR:-1}
 
     LP_MARK_DEFAULT="${LP_MARK_DEFAULT:-$_LP_MARK_SYMBOL}"
     LP_MARK_BATTERY="${LP_MARK_BATTERY:-"⌁"}"
@@ -4797,11 +4798,17 @@ _lp_default_theme_prompt() {
 # Construct the prompt #
 ########################
 
+_LP_REAL_COMMAND=0
 __lp_set_prompt() {
     # Display the return value of the last command, if different from zero
     # As this get the last returned code, it should be called first
     local -i lp_error="$?"
 
+    if (( ! _LP_REAL_COMMAND && LP_HIDE_EMPTY_ERROR )); then
+        lp_error=0
+    fi
+    _LP_REAL_COMMAND=0
+
     if (( LP_ENABLE_RUNTIME || LP_ENABLE_RUNTIME_BELL )); then
         __lp_runtime_after
     fi
@@ -4847,16 +4854,31 @@ __lp_before_command() {
     # For debugging
     #printf 'XXX %s\n' "$BASH_COMMAND"
 
+    local bash_command="$BASH_COMMAND"
+
     # If this is the first time after the user submitted the command,
     # execute the hooks.
     if (( _LP_AT_PROMPT )); then
         _LP_AT_PROMPT=0
 
+        # If this is the first command and it is in PROMPT_COMMAND, then probably the user has probably
+        # hit ^C and we should ignore $? in __lp_set_prompt and don't show the 130 error.
+        if (( ${BASH_VERSINFO[0]:-0} > 5 || ( ${BASH_VERSINFO[0]:-0} == 5 && ${BASH_VERSINFO[1]:-0} >= 1 ) )); then
+            # PROMPT_COMMAND is an array since bash 5.1
+            if ! ( __lp_array_contains "$bash_command" ${PROMPT_COMMAND[@]+"${PROMPT_COMMAND[@]}"} ); then
+                _LP_REAL_COMMAND=1
+            fi
+        else
+            if [[ "$PROMPT_COMMAND" != "$bash_command"*  ]]; then
+                _LP_REAL_COMMAND=1
+            fi
+        fi
+
         if (( LP_ENABLE_RUNTIME || LP_ENABLE_RUNTIME_BELL )); then
             __lp_runtime_before
         fi
 
-        if (( LP_ENABLE_TITLE_COMMAND )); then
+        if (( _LP_REAL_COMMAND && LP_ENABLE_TITLE_COMMAND )); then
             __lp_print_title_command
         fi
     fi
@@ -4876,6 +4898,10 @@ __lp_before_command() {
     fi
 }
 
+__lp_run_real_command() {
+    _LP_REAL_COMMAND=1
+}
+
 prompt_tag() {
     if [[ -n "${1-}" ]]; then
         export LP_PS1_PREFIX="$1 "
@@ -4928,8 +4954,10 @@ prompt_on() {
                 PROMPT_COMMAND="$set_prompt_command"
             fi
 
-            if (( LP_ENABLE_RUNTIME || LP_ENABLE_RUNTIME_BELL || LP_ENABLE_TITLE_COMMAND )); then
+            if (( LP_ENABLE_RUNTIME || LP_ENABLE_RUNTIME_BELL || LP_ENABLE_TITLE_COMMAND \
+               || LP_HIDE_EMPTY_ERROR )); then
                 _LP_AT_PROMPT=0
+                _LP_REAL_COMMAND=0
                 _LP_RUNTIME_LAST_SECONDS=$SECONDS
                 # __lp_before_command gets called just before bash executes a command,
                 # including $PROMPT_COMMAND
@@ -4999,6 +5027,9 @@ prompt_on() {
         if (( LP_ENABLE_TITLE_COMMAND )); then
             add-zsh-hook preexec __lp_print_title_command
         fi
+        if (( LP_HIDE_EMPTY_ERROR )); then
+            add-zsh-hook preexec __lp_run_real_command
+        fi
     fi
 }
 
@@ -5037,7 +5068,8 @@ __lp_disable_hooks() {
             fi
 
             # Disable the DEBUG trap used by the RUNTIME or TITLE_COMMAND features
-            if (( ${LP_ENABLE_RUNTIME-0} || ${LP_ENABLE_RUNTIME_BELL-0} || ${LP_ENABLE_TITLE_COMMAND-0} )); then
+            if (( ${LP_ENABLE_RUNTIME-0} || ${LP_ENABLE_RUNTIME_BELL-0} || ${LP_ENABLE_TITLE_COMMAND-0} \
+               || ${LP_HIDE_EMPTY_ERROR-0} )); then
                 trap - DEBUG
             fi
         fi
@@ -5048,6 +5080,7 @@ __lp_disable_hooks() {
             add-zsh-hook -d precmd  __lp_set_prompt
             add-zsh-hook -d preexec __lp_runtime_before
             add-zsh-hook -d preexec __lp_print_title_command
+            add-zsh-hook -d preexec __lp_run_real_command
         } >/dev/null
     fi
 }