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

: "${CARGO:=cargo}"

# --------------------------------------------------------------------------------
# subcommands that just go and do a thing, by default, need an entry in this list
# this causes us to run, eg `arti proxy --help` rather than just `arti proxy`.
help_arg () {
    case "$subcommand" in
        'proxy' | 'hss onion-name' | 'relay' | 'hsc prepare-service-discovery-key' )
	        help_arg='--help' ;;
        *) ;;
    esac
}
# --------------------------------------------------------------------------------

fail () {
    echo >&2 "ERROR: $*"
    exit 16
}

exec 4>&2

x () {
    echo >&4 "    $*"
    "$@"
}

trap '
	echo "last output from cargo run:"
	cat "$help_file"
	exit 1
' 0

echo 'checking help output'

check_recurse () {
    mkdir -p target/test/check-cli-help
    help_file="target/test/check-cli-help/help-output,$*.txt"
    help_file="${help_file// /,}"
    local help_arg=''

    subcommand="$*"
    subcommand="${subcommand#* -- }"
    help_arg

    case "$*" in
	*' help') return ;;
    esac

    exec 3>"$help_file"
    set +e
    # shellcheck disable=SC2086
    x "$CARGO" run "$@" $help_arg >&3 2>&3
    rc=$?
    set -e
    test $rc = 0 || test $rc = 2 || fail "help message unexpected status $rc"
    for exp in 'Usage' 'Options'; do
	grep "^$exp:" "$help_file" >/dev/null || fail "expected to find $exp"
    done
    commands=$(perl -ne '
	next unless m{^Commands:}...m{^\S};
	next unless m{^  \S};
	s{^  ([a-z][0-9a-z-]*) .*}{$1} or die "$_ ?";
	print;
    ' "$help_file")
    for command in $commands; do
	check_recurse "$@" "$command"
    done
}

check_recurse                --bin arti --
check_recurse --all-features --bin arti --

trap '' 0
echo ok.
