work 2>1 | follow_and_log

follow_and_log() {
  while IFS=$'\n' read -r line; do
    echo "${line}" >> "${logfile}"
    echo "$(simplify "${line}")"  # see attachment for details
  done
}

#!/usr/bin/env bash

set -euo pipefail

logfile="${0}.log"
echo -n "" > "${logfile}"

export GUM_LOG_LEVEL=debug

work() {
  i=1
  while true ; do
    cat <<JSON
{"level":"INFO","time":"2025-08-08T08:39:15,${i}","request":"94888d6a-013a-4fae-92ab-a656e4868808","message":"Message '${i}'", "details": "More stuff"}
JSON
    echo "something else"
    (( i += 1 ))
    sleep 0.2s
  done
}

follow_and_log() {
  while IFS=$'\n' read -r line; do
    echo "${line}" >> "${logfile}"

    if jq -e '.' <<< "${line}" &> /dev/null; then
      level="$(jq -er '.level // "debug"' <<< "${line}")"
      msg="$(jq -er '.message // "<no message>"' <<< "${line}")"
    else
      level="debug"
      msg="${line}"
    fi
    gum log --level="${level,,}" "${msg}"
  done
}

abort() {
  docker kill repro
  echo "🙅 Aborted"
}

function main() {
  trap "abort" SIGINT SIGHUP SIGTERM
  {
    docker run --rm --name 'repro' -v "$(pwd)":/app:ro ubuntu \
      bash -c 'source /app/gum_log_repro.sh; work;' \
      2>&1 \
    | follow_and_log \
    && echo "✅ Done";
  } || echo "❌ Failed"
  trap - SIGINT SIGHUP SIGTERM
}  

if [[ "${0}" == "./gum_log_repro.sh" ]]; then
  main
fi