Shell log formatter with increment/decrement indentation thingy

log-indent-test.sh

#!/usr/bin/env bash
set -ueo pipefail

outofbandlogstring="This string must NEVER appear in the script's stdout/err ..." # or, like, simply "§" ...

function enter() {
  echo "$@"
  echo "${outofbandlogstring}+2"
}

function leave() {
  echo "${outofbandlogstring}-2"
  echo "$@"
}

function func1() {
  echo "Some stdout stuff in func1 ..."
  echo "Some stderr stuff in func1 ..." >&2
}

function func2() {
  enter "Starting func2" 
  echo "Some stderr stuff in func2 ..." >&2
  echo "$(echo "Some uncontrolled stuff in func2")"
  echo "Some uncontrolled stuff in func2" >&2
  echo "Some stdout stuff in func2 ..."
  leave "Leaving func2" 
}

function main() {
  enter "Starting main ..." 
  echo "Some stdout stuff in main."
  echo "Some stderr stuff in main." >&2
  func1
  func2
  func1
  echo "Some stderr stuff in main." >&2
  echo "Some stdout stuff in main."
  leave "Leaving main" 
}

function timestamp_stream() {
  awk -F"$outofbandlogstring" 'BEGIN{rep=1}$2{rep+=$2}rep<1{rep=1}!$2{"(date)"|getline d;print d sprintf("%*s",rep,"") $0;close(cmd)}'
}

set -o pipefail
main 2>&1 | timestamp_stream | tee output.$(date +%s).log