#!/bin/sh
set -eu

usage() {
	cat <<-'EOF'
		Usage:
		  shot [-m]
		  shot -h
	EOF
}

help() {
	cat <<-'EOF'


		Options:
		  -m            use the mouse to select the region to screen shot
		  -h, --help    show this message


		Take a screenshot.  The default is to print the whole screen, but
		the "-m" can be given to select only a part of the screen.

		The screenshots are saved to ~/Pictures/Screenshots/


		Examples:

		  Take screenshot of the full screen:

		    $ shot


		  Select the region of the screenshot:

		    $ shot -m
	EOF
}


for flag in "$@"; do
	case "$flag" in
		(--)
			break
			;;
		(--help)
			usage
			help
			exit
			;;
		(*)
			;;
	esac
done

OPTS=
while getopts 'mh' flag; do
	case "$flag" in
		(m)
			OPTS='-s'
			;;
		(h)
			usage
			help
			exit
			;;
		(*)
			usage >&2
			exit 2
			;;
	esac
done
shift $((OPTIND - 1))

TEMPLATE=~/Pictures/Screenshots/%Y-%m-%dT%H:%M:%S.png
mkdir -p "$(dirname "$TEMPLATE")"

scrot $OPTS "$TEMPLATE"
msg -D "screenshot saved on ~/Pictures/Screenshots/"
