locker

#!/usr/bin/env bash

# ╻  ┏━┓┏━╸╻┏ ┏━╸┏━┓
# ┃  ┃ ┃┃  ┣┻┓┣╸ ┣┳┛
# ┗━╸┗━┛┗━╸╹ ╹┗━╸╹┗╸
# simple locker with xautolock and zzz

set -o errexit
set -o pipefail
set -o nounset

PROG=$(basename "$0")
DEPS=(xautolock zzz setsid)
SUSPEND_TIME=30
LOCKER="sudo zzz"
CMD="xautolock"

function log_err {
    printf "%s: %s\n" "$PROG" "$*"
    exit 1
}

function send_notification {
    local prog
    local icon="system-lock-screen-symbolic"
    local mesg="<b>$1</b>"
    prog=$(echo "$PROG" | tr '[:lower:]' '[:upper:]')
    notify-send -i "$icon" "$prog" "$mesg"
}

function is_running {
    if ! pgrep -x "$CMD" >/dev/null; then
        return 1
    fi
    return 0
}

function kill_locker {
    pkill -x "$CMD"
}

function usage {
    cat <<-END
╻  ┏━┓┏━╸╻┏ ┏━╸┏━┓
┃  ┃ ┃┃  ┣┻┓┣╸ ┣┳┛
┗━╸┗━┛┗━╸╹ ╹┗━╸╹┗╸

simple locker with xautolock and zzz

Usage: $PROG <timer in minutes> (default: 30m | max: 60m)
END
}

function main {
    local timer dep
    timer="${1:-}"

    for dep in "${DEPS[@]}"; do
        if ! command -v "$dep" >/dev/null; then
            local err_msg="'$dep' not found"
            send_notification "$err_msg"
            log_err "$err_msg"
        fi
    done

    if [[ "${1-}" =~ ^-*h(elp)?$ ]]; then
        usage
        exit
    fi

    if is_running; then
        kill_locker
    fi

    [[ -n "$timer" ]] && SUSPEND_TIME=$timer
    setsid -f "$CMD" -time "$SUSPEND_TIME" -locker "$LOCKER" -detectsleep
    send_notification "<i>Setting locker to</i> ${SUSPEND_TIME}m"
}

main "$@"