#!/bin/sh

# The MIT License (MIT)
#
# Copyright (c) 2026 pacman64
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


# pause [options...] [words...]
#
# Show a prompt and wait for a key press, no need for the enter key. You can
# show a custom prompt using the arguments, same way as the `echo` command.
#
# If no words are given for the prompt, a default message is used instead.
#
# The options are, available both in single and double-dash versions
#
#   -h, -help       show this help message
#   -t, -timeout    wait only up to the number of seconds given


wait_key='dd if=/dev/tty bs=512 count=1'

case "$1" in
    -h|--h|-help|--help)
        awk '/^# +pause /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
        exit 0
    ;;

    -t|--t|-timeout|--timeout)
        if [ $# -lt 2 ]; then
            printf "forgot the timeout seconds\n" >&2
            exit 1
        fi
        if echo "$2" | grep -q '[^0-9]'; then
            printf "use a round positive number for the seconds\n" >&2
            exit 1
        fi
        wait_key="timeout -f $2 ${wait_key}"
        shift
        shift
    ;;
esac

[ "$1" = '--' ] && shift

if [ $# -eq 0 ]; then
    printf "Press (almost) anything on your keyboard to continue..."
else
    printf "%s" "$*"
fi

prev="$(stty -g)"
trap "stty \"${prev}\"; printf \"\\n\"; exit" 0
stty raw -echo

${wait_key} > /dev/null 2> /dev/null