almost fix return 0

bin/miaou-bash

@@ -39,7 +39,6 @@ function on_return {
   if [[ "${BASH_COMMAND}" == 'return '* ]]; then
     code=$(echo "${BASH_COMMAND}" | cut -d' ' -f2)
     if [[ -n "$code" ]] && [[ "$code" -ne 0 ]]; then
-      trap - DEBUG
       >&2 echo "${BASH_SOURCE[2]}: line ${BASH_LINENO[0]}: return $code from ${FUNCNAME[1]}"
     fi
   fi
@@ -49,6 +48,7 @@ function on_exit {
   code=${1:-0}
 
   if [[ $code -gt 0 ]]; then
+
     stack_lines=("${BASH_LINENO[@]}")
     stack_functions=("${FUNCNAME[@]}")
     stack_sources=("${BASH_SOURCE[@]}")
@@ -91,7 +91,7 @@ function on_exit {
         failure_payload="${BASH_REMATCH[2]}"
       fi
       last_error="${BASH_SOURCE[1]}:${BASH_LINENO[0]} subshell term $code"
-      printf "\r"
+      printf "\r" # useful!
       kill -USR1 $$
     else
       failure_type='UNKNOWN'
@@ -192,7 +192,7 @@ function on_exit {
 }
 
 function miaou_debug {
-  is_true "${MIAOU_DEBUG}" && >/dev/tty echo "*********** DEBUG: $*" || true
+  is_true "${MIAOU_DEBUG}" && >/dev/tty builtin echo -e "*********** DEBUG: $*" || true
 }
 
 function ansi_block_continuation {
@@ -204,24 +204,22 @@ function ansi_block_continuation {
 }
 
 function ansi_block_error {
-  BG=RED
   FG=BLACK
+  BG=RED
   PADDING=2
-
   local content detail exit_code
 
   content=$(style_ansi "$1")
   content=$(style_padding "$content")
 
   detail="$2"
-  [[ -n "$detail" ]] && detail=$(BG=BLACK FG=WHITE style_padding "$2")
+  [[ -n "$detail" ]] && detail=$(BG=BLACK FG=WHITE PADDING_LEFT=4 style_padding "$2")
 
-  exit_code=$(FG=CYAN style_ansi " $3")
-  printf "\r"
+  exit_code=$(FG=CYAN style_ansi "$3")
+  builtin echo -en "\r"
   BLOCK_CONTINUATION_COL=5 style_block "$content$detail$exit_code"
   ansi_reset
-  FG=RED style_ansi "     ║"
-  echo
+  FG=RED style_ansi "     ║" && builtin echo
 }
 
 function ansi_traces {
@@ -243,22 +241,19 @@ function ansi_traces {
 function dump_failure {
   declare -F style_ansi >/dev/null || source "$MIAOU_BASH_DIR/lib/ansi.bash"
   dump_stderr true
+
+  miaou_debug "---error box ${failure_type:-} ---"
   if [[ ${failure_type} == 'SUBSHELL SOURCE NOT FOUND' ]]; then
     :
   else
-    miaou_debug '---error---'
-    if [[ $failure_type == 'SUBSHELL ERROR' ]]; then
-      >&4 echo -e "${failure_payload}"
-    else
-      >&4 ansi_block_error "$failure_type" "$failure_payload" "$code"
-    fi
-    miaou_debug '---end of error---'
+    >&4 ansi_block_error "$failure_type" "$failure_payload" "$code"
   fi
+  miaou_debug '---end of error box---'
 
   miaou_debug '---stacktrace---'
   >&4 ansi_traces stack_sources stack_lines stack_functions
-
   miaou_debug '---end of stacktrace---'
+
   cleanup
 }