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#!/bin/bash
#***************************************************************************
#*** noz - prevent laptop from sleeping when lid is closed
#***************************************************************************
#***** set some defaults *****
BATTERY_SLEEP=5 # in minutes
DEF_WAKE_LEN=36000 # in seconds
#***** determine timeout value *****
timeout_len=${1:-$DEF_WAKE_LEN}
function prevent_sleep() {
    echo -n "Preventing sleep for $timeout_len seconds; press <enter> to continue..."
    sudo pmset -b disablesleep 1
    sudo pmset -b sleep 0
}
function enable_sleep() {
    # $1: <enter> = 0, timeout = 1, Ctrl-C = undef
    #----- insert a newline for timeout or Ctrl-C -----
    if [[ ${1:-1} -eq 1 ]]; then    echo; fi
    echo "Restoring previous battery sleep setting: $BATTERY_SLEEP"
    sudo pmset -b disablesleep 0
    sudo pmset -b sleep $BATTERY_SLEEP
    #----- sleep on timeout only -----
    if [[ ${1:--1} -eq 1 ]]; then   sudo pmset sleepnow; fi
    exit
}
#***** prevent it from sleeping *****
prevent_sleep
#***** trap Ctrl-C *****
trap enable_sleep INT
#***** wait for an enter *****
read -t $timeout_len
rc=$?
#***** re-enable normal sleep *****
enable_sleep $rc

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# redns
sudo killall -HUP mDNSResponder