#=======================================
# SETUP
#=======================================

set -u

abort() {
	printf "%s\n" "$@" >&2
	exit 1
}

export NEWT_COLORS='
    root=white,black
    border=black,lightgray
    window=lightgray,lightgray
    shadow=black,gray
    title=black,lightgray
    button=black,cyan
    actbutton=white,cyan
    compactbutton=black,lightgray
    checkbox=black,lightgray
    actcheckbox=lightgray,cyan
    entry=black,lightgray
    disentry=gray,lightgray
    label=black,lightgray
    listbox=black,lightgray
    actlistbox=black,cyan
    sellistbox=lightgray,black
    actsellistbox=lightgray,black
    textbox=black,lightgray
    acttextbox=black,cyan
    emptyscale=,gray
    fullscale=,cyan
    helpline=white,black
    roottext=lightgrey,black
'

#=======================================
# SANITY CHECKS
#=======================================

# Fail fast with a concise message when not using bash
# Single brackets are needed here for POSIX compatibility
# shellcheck disable=SC2292
if [ -z "${BASH_VERSION:-}" ]; then
	abort "Bash is required to interpret this script."
fi

# Check if script is run with force-interactive mode in CI
if [[ -n "${CI-}" && -n "${INTERACTIVE-}" ]]; then
	abort "Cannot run force-interactive mode in CI."
fi

# Check if both `INTERACTIVE` and `NONINTERACTIVE` are set
# Always use single-quoted strings with `exp` expressions
# shellcheck disable=SC2016
if [[ -n "${INTERACTIVE-}" && -n "${NONINTERACTIVE-}" ]]; then
	abort 'Both `$INTERACTIVE` and `$NONINTERACTIVE` are set. Please unset at least one variable and try again.'
fi

# Check if script is run in POSIX mode
if [[ -n "${POSIXLY_CORRECT+1}" ]]; then
	abort 'Bash must not run in POSIX mode. Please unset POSIXLY_CORRECT and try again.'
fi