Mac notify script

mac-notify

#!/usr/bin/env bash
#set -x
#
# Copyright (c) 2018 Joyent Inc.
#
# This script will set a reminder on your mac that generates a popup notification
# using applescript upon completion.
#
# shellcheck disable=SC2155
#
# Author: Jesse Butryn <jesse.butryn@joyent.com>
#
# 03/01/2018	-	Initial draft.
#
##############################
# Table of Contents
##############################
#
# 1) Functions
# 2) Arguments
# 3) Run
#
##############################
# Section 1 Functions
##############################
echo.help () { # Displays help and usage information
	cat <<EOF

This script will set a reminder that sends a popup notification to your mac.

Usage: $(basename "$0") +0130 -m Dont forget that thing you need not forget.
       $(basename "$0") [[+]HHMM] [-m message]

  HHMM		The time of day is in the form hhmm where HH is a time in hours (24 hour clock only), and MM are minutes.
  +		If the time is preceded by '+', the alarm will go off in hours and minutes from the current time.
  -h            Print help output.
  -m		(Optional) Enter message that will appear in the popup

EOF
	exit 10
} # end echo.help
mac.notify () {
    local okay
    local cancel
    local message
    while (( $# )); do
        case $1 in
            -o) shift; okay=$1;;
            -c) shift; cancel=$1;;
            *)    message=$*;break;;
        esac
        shift
    done
    osascript <<EOF
        set theDialogText to "${message:-"Alert!"}"
        display dialog theDialogText buttons {"${cancel:-"Also Okay"}", "${okay:-Okay}"} default button "${okay:-Okay}" cancel button "${cancel:-"Also Okay"}"
EOF
}
calc.offset () {
	local h=${1:0:2}
	local m=${1:2:2}
	date -v+"${h}H" -v+"${m}M"
}
sleep.offset () {
	local h=${1:0:2}
	local m=${1:2:2}
	local s=$(( (h*60*60) + (m*60) ))
	echo "$s"
}
sleep.time () {
	local t=$1
	local cur_epoch=$(date '+%s')
	local end_epoch=$(date -j -f '%H%M' "$t" '+%s')
	local s=$((end_epoch-cur_epoch))
	echo "$s"
}
notify.main () {
	echo -e "Timer set for:\t$end_time"
	sleep "$sleep_time" && mac.notify "$notify_mesg" >/dev/null 2>&1 &
}
##############################
# Section 2 Arguments
##############################
[[ "$#" -lt '1' ]] && echo.help
while (( $# )); do
	case $1 in
		-m) shift; notify_mesg=$*;break;;
		+[0-9][0-9][0-9][0-9]) 
			sleep_time=$(sleep.offset "${1/+/}")
			end_time=$(calc.offset "${1/+/}")
		;;
		[0-9][0-9][0-9][0-9]) 
			sleep_time=$(sleep.time "$1")
			end_time=$(date -j -f '%H%M' "$1")
		;;
		*) echo.help;;
	esac
	shift
done
##############################
# Section 3 Run
##############################
notify.main