Repeat a command until it fails with a non-zero exit code

repeat.sh

#!/usr/bin/env bash
# ShellChecked with no issues detected
#
# Example usage for debugging a sporadically failing program:
# repeat.sh -- gdb --eval-command=run --eval-command=quit --args ./a.out

while [[ $1 != "--" ]]; do
    n=$1
    shift
done

shift

if [[ -n $n ]]; then
    i=0
    ret=0
    while [[ $i -lt $n && $ret -eq 0 ]]; do
        eval "$@"
        ret=$?
        i=$((i + 1))
    done
else
    ret=0
    while [[ $ret -eq 0 ]]; do
        eval "$@"
        ret=$?
    done
fi

alias debug="repeat.sh -- gdb --eval-command=run --eval-command=quit --args"