Exit with error INMEDIATELY if a script if a warning is generated and matches the given string.

exit_on_warning.sh

#!/bin/bash
# Original idea taken from: https://unix.stackexchange.com/questions/556240/how-can-a-command-within-a-pipeline-abort-the-pipeline

exit_on_warning() {
  sed '/atom ::: must be written between quotes, as in :"::", to avoid ambiguity/{q 2}' || kill "$BASHPID" 
}

run() {
  make docs_elixir
  echo "Docs successfully generated!"
}

run 2>&1 | exit_on_warning | cat || cat
EXIT_STATUS=${PIPESTATUS[0]}

echo "Exit status: ${EXIT_STATUS}"
if [ $EXIT_STATUS -eq 0 ]; then
  exit 0;
else
  exit 1;
fi