From 5a752fa21047af18581d2816d370fad8264ff882 Mon Sep 17 00:00:00 2001
From: pvincent <pvincent@artcode.re>
Date: Mon, 27 Jul 2026 11:44:17 +0400
Subject: [PATCH] poc3

---
 poc                     | 50 ++++++++++++++++++++++++++++++++++-------
 test/stub/scenario.bash |  2 ++
 2 files changed, 44 insertions(+), 8 deletions(-)

diff --git a/poc b/poc
index e4333bb..ce4549d 100755
--- a/poc
+++ b/poc
@@ -25,14 +25,25 @@ function tty_ansi {
 }
 
 function on_error {
+  local code
+  code="${1:-100}"
   >/dev/tty printf '\r' # force carriage return explicitly
 
-  code="${1:-100}"
-  # miaou_debug "on_error: $code ($$ -- $BASHPID)"
+  miaou_debug "on_error: $code ($$ -- $BASHPID)"
 
   if [[ $$ == "$BASHPID" ]]; then
     >&2 echo "${BASH_SOURCE[1]}: line ${BASH_LINENO[0]}: command_error: ${code}"
     failure_type="COMMAND_ERROR"
+    error_source=("${BASH_SOURCE[@]}")
+    error_lineno=("${BASH_LINENO[@]}")
+    error_funcname=("${FUNCNAME[@]}")
+    unset 'error_source[-1]' 'error_lineno[-1]' 'error_funcname[-1]'
+    unset 'error_source[0]' 'error_lineno[-1]' 'error_funcname[0]'
+    error_funcname[-1]='<main>'
+    error_source=("${error_source[@]}")
+    error_lineno=("${error_lineno[@]}")
+    error_funcname=("${error_funcname[@]}")
+
     exit "$code"
   else
     >&2 echo "${BASH_SOURCE[1]}: line ${BASH_LINENO[0]}: subshell_error: ${code}"
@@ -60,9 +71,15 @@ function dump_failure {
 }
 
 function dump_stacktrace {
-  miaou_debug --stacktrace--
+  miaou_debug --stacktrace ${#error_source[@]}--
   tty_ansi 94
-  echo TODO: stacktrace...
+  local i source lineno funcname
+  for i in "${!error_source[@]}"; do
+    source="${error_source[$i]}"
+    lineno="${error_lineno[$i]}"
+    funcname="${error_funcname[$i]}"
+    printf "%40s:%.4s \t%s\n" "$source" "$lineno" "$funcname"
+  done
   tty_ansi 0
   miaou_debug --end of stacktrace--
 }
@@ -79,13 +96,30 @@ function on_exit {
 }
 
 function on_pipe {
-  local code=141 # default code error for pipe
-  local tmp_error regex
+  local code tmp_error regex
+
+  error_source=("${BASH_SOURCE[@]}")
+  error_lineno=("${BASH_LINENO[@]}")
+  error_funcname=("${FUNCNAME[@]}")
+  unset 'error_source[0]' 'error_lineno[0]' 'error_funcname[0]'
+  unset 'error_source[-1]' 'error_lineno[-1]' 'error_funcname[-1]'
+  unset 'error_source[-1]' 'error_lineno[-1]' 'error_funcname[-1]'
 
   mapfile -t tmp_error <"$MIAOU_BASH_ERROR"
   last_error="${tmp_error[-1]}"
-  regex='.*: line [0-9]+: subshell_error: ([0-9]+)'
-  [[ $last_error =~ $regex ]] && code=${BASH_REMATCH[1]} && failure_type="SUBSHELL_ERROR"
+  regex='(.*): line ([0-9]+): subshell_error: ([0-9]+)'
+  if [[ $last_error =~ $regex ]]; then
+    source=${BASH_REMATCH[1]}
+    lineno=${BASH_REMATCH[2]}
+    code=${BASH_REMATCH[3]}
+    failure_type="SUBSHELL_ERROR"
+    error_source=("$source" "${error_source[@]}")
+    error_lineno=("$lineno" "${error_lineno[@]}")
+    error_funcname=("${error_funcname[@]}" '<main>')
+  else
+    code=141
+    failure_type="PIPE_ERROR"
+  fi
 
   # miaou_debug on_pipe: "${code}"
   exit "$code"
diff --git a/test/stub/scenario.bash b/test/stub/scenario.bash
index 17ced1e..0bd908d 100755
--- a/test/stub/scenario.bash
+++ b/test/stub/scenario.bash
@@ -22,6 +22,7 @@ function do_subshell_term {
   # echo 'toto' | return 3
 
   echo -n "found1=$(grep nope nope)"
+  echo -n "found1=$(false)"
   # echo "found1=$(grep nope nope | grep none)"
   # echo "found2=$(command_not_found)"
   # echo SHOULD NOT SHOW UP!
@@ -139,6 +140,7 @@ function main {
   F1
   F3
   echo before subshell
+  grep nope nope 2>/dev/null
   echo "here in subshell $(grep titi $0)"
   echo NO MORE