Small bash notification panel helper

snotify

#!/usr/bin/env bash

show_help() {
    cat << EOF
${1}

USAGE:
    snotify log [MODULE] MESSAGE
        Log a message to the notifications panel
    snotify enable [HEIGHT]
        Enable notification panel with height (default: 1)
    snotify disable
        Disable notifications panel
    snotify -h | --help
        Show this help message
EOF
}

log() {
    local message module

    if [[ -z "${1}" ]]; then
        printf 'No notification text specified\n' >&2
        return 1
    fi
    if [[ -z "${2}" ]]; then
        module="snotify"
        message="${1}"
    else
        module="${1}"
        message="${2}"
    fi
    printf $'\e7\e[1;%dr\e[%dH\e[1S [%s] [%-20s] %s\e[%dr\e8' \
        "${SNOTIFY_LINES}" "${SNOTIFY_LINES}" \
        "$(date '+%F %T')" "${module}" "${message}" \
        "${SNOTIFY_RESERVED}"
}

enable() {
    local cols sep

    cols="$(tput cols)"
    sep="$(printf '%*s' "$(((cols - 15) / 2))" '' | tr ' ' '-')"
    export SNOTIFY_LINES="${1}"
    export SNOTIFY_RESERVED="$((${1} + 2))"

    printf $'\e[?1049h\e[%dr\e[%dH\e[B%s Notifications %s\n' \
        "${SNOTIFY_RESERVED}" "${SNOTIFY_LINES}" "${sep}" "${sep}"
}

disable() {
    printf $'\e[?1049l'
    export SNOTIFY_LINES=""
    export SNOTIFY_RESERVED=""
}

main() {
    local opt

    for opt in "${@}"; do
        if [[ "${opt}" =~ ^-(h|-help)$ ]]; then
            show_help "Notification pane in your terminal!"
            return
        fi
    done

    case "${1}" in
        enable )
            enable "${2:-1}"; return;;
        disable )
            disable; return;;
        log )
            log "${2}" "${3}"; return;;
        * )
            show_help "Invalid subcommand: ${1}" >&2; return 1;;
    esac
}

main "${@}"
unset -f main enable disable log show_help