#######################################
# Print stack trace
#
-# usage: err-bash-trace [FRAME_START]
+# usage: err-bash-trace [MESSAGE]
#
# This function is called by the other functions which print stack
# traces.
# shopt -s extdebug
# which err-catch & err-print do for you.
#
-# FRAME_START The frame to start printing on. default=0. Useful when
-# printing from an ERR trap function to avoid printing
-# that function.
+# MESSAGE Message to print just before the stack trace.
+#
+# _frame_start Optional variable to set before calling. The frame to
+# start printing on. default=1. Useful when printing from
+# an ERR trap function to avoid printing that function.
#######################################
err-bash-trace() {
- local -i argc_index=0 frame i start=${1:-0} max_indent=8 indent
+ local -i argc_index=0 frame i start=${_frame_start:-1}
local source
- local extdebug=false
- if [[ $(shopt -p extdebug) == *-s* ]]; then
- extdebug=true
+ if [[ $1 ]]; then
+ printf "%s\n" "$1"
fi
- for ((frame=0; frame < ${#FUNCNAME[@]}-1; frame++)); do
+ for ((frame=0; frame < ${#FUNCNAME[@]}; frame++)); do
argc=${BASH_ARGC[frame]}
argc_index+=$argc
((frame < start)) && continue
if (( ${#BASH_SOURCE[@]} > 1 )); then
- source="${BASH_SOURCE[frame+1]}:${BASH_LINENO[frame]}:"
+ source="${BASH_SOURCE[frame]}:${BASH_LINENO[frame-1]}:"
fi
- indent=$((frame-start + 1))
- indent=$((indent < max_indent ? indent : max_indent))
- printf "%${indent}s↳%sin \`%s" '' "$source" "${FUNCNAME[frame]}"
- if $extdebug; then
+ printf " from %sin \`%s" "$source" "${FUNCNAME[frame]}"
+ if shopt extdebug >/dev/null; then
for ((i=argc_index-1; i >= argc_index-argc; i--)); do
printf " %s" "${BASH_ARGV[i]}"
done
err=$?
exec >&2
set +x
- echo "${BASH_SOURCE[1]}:${BASH_LINENO[0]}: \`$BASH_COMMAND' returned $err"
- err-bash-trace 2
+ local msg="${BASH_SOURCE[1]}:${BASH_LINENO[0]}: \`$BASH_COMMAND' returned $err"
+ if (( ${#FUNCNAME[@]} > 2 )); then
+ local _frame_start=2
+ err-bash-trace "$msg"
+ else
+ echo "$msg"
+ fi
set -e # err trap does not work within an error trap
- "${_errcatch_cleanup[@]:-:}" # note :-: is to be compatible with set -u
- echo "$0: exiting with code $err"
+ # note :-: makes this compatible with set -u, assigns : if unset, but shellcheck
+ # doesn't understand that.
+ # shellcheck disable=SC2154
+ "${_errcatch_cleanup[@]:-:}"
+ echo "$0: exiting with status $err"
exit $err
}
trap _err-trap ERR
set -o pipefail
}
+
+#######################################
+# For interactive shells: on error, print stack trace and return
+#
+# Globals:
+# _err_func_last Used internally.
+# _err_catch_err Used internally.
+# _err_catch_i Used internally.
+#
+# misc: All shellcheck disables for this function are false positives.
+#######################################
+# shellcheck disable=SC2120
+err-catch-interactive() {
+ # shellcheck disable=SC2034
+ declare -i _err_func_last=0
+ set -E; shopt -s extdebug
+ # shellcheck disable=SC2154
+ trap '_err_catch_err=$? _trap_bc="$BASH_COMMAND"
+ if (( ${#FUNCNAME[@]} > _err_func_last )); then
+ echo ERR: \`$_trap_bc'"\'"' returned $_err_catch_err
+ fi
+ _err_func_last=${#FUNCNAME[@]}
+ if (( _err_func_last )); then
+ printf " from %s:%s:in \`%s" "${BASH_SOURCE[0]}" "$(declare -F "${FUNCNAME[0]}"|awk "{print \$2}")" "${FUNCNAME[0]}"
+ if shopt extdebug >/dev/null; then
+ for ((_err_catch_i=${BASH_ARGC[0]}-1; _err_catch_i >= 0; _err_catch_i--)); do
+ printf " %s" "${BASH_ARGV[_err_catch_i]}"
+ done
+ fi
+ echo '"\'"'
+ return $_err_catch_err
+ fi' ERR
+ set -o pipefail
+}
+
+
#######################################
# Undoes err-catch. turns off exit and stack trace on error.
#######################################
}
# We want this more often than not, so run it now.
-err-catch
+if [[ $- == *i* ]]; then
+ err-catch-interactive
+else
+ err-catch
+fi