#!/usr/bin/env bash
# ------------------------------------------------------------------------------
# Copyright (c) 2013-2022 Geoffray Levasseur <fatalerrors@geoffray-levasseur.org>
# Protected by the BSD3 license. Please read bellow for details.
#
# * Redistribution and use in source and binary forms,
# * with or without modification, are permitted provided
# * that the following conditions are met:
# *
# *   Redistributions of source code must retain the above
# *   copyright notice, this list of conditions and the
# *   following disclaimer.
# *
# *   Redistributions in binary form must reproduce the above
# *   copyright notice, this list of conditions and the following
# *   disclaimer in the documentation and/or other materials
# *   provided with the distribution.
# *
# *   Neither the name of the copyright holder nor the names
# *   of any other contributors may be used to endorse or
# *   promote products derived from this software without
# *   specific prior written permission.
# *
# * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
# * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
# * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
# * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# * OF SUCH DAMAGE.
# ------------------------------------------------------------------------------

# ------------------------------------------------------------------------------
# Make non-IT peoples think you're busy doing something hard
# ------------------------------------------------------------------------------
busy()
{
    local pattern="ca fe"
    for arg in "$@"; do
        case "$arg" in
            --delay=*)
                delay_ms="${arg#*=}"
                if ! [[ $delay_ms =~ ^[0-9]+$ ]]; then
                    disp E "Invalid delay value, must be an integer (milliseconds)."
                    return 1
                fi
                ;;
            *)
                pattern="$arg"
                ;;
        esac
    done

    # Convert milliseconds to seconds for 'sleep'
    local delay_s=$(awk "BEGIN { printf \"%.3f\", $delay_ms / 1000 }")

    cat /dev/urandom | hexdump -C | grep --line-buffered "$pattern" | \
        while read -r line; do
        echo $line
        [[ $delay_ms -gt 0 ]] && sleep "$delay_s"
    done
    unset pattern
}

# ------------------------------------------------------------------------------
# EOF