#!/usr/bin/env bash
  
# daipture - screen capturing tool
# https://github.com/daimh/daipture
# https://kinzler.com/me/home.html#other

#20201026 renamed to daipture to release it
#20190802 -f
#20180301 initial version
set -e
trap "exit 1" TERM
export TOP_PID=$$
function helpme() {
	if [[ "$1" = "" ]]
	then
		cat /proc/$$/fd/255 | sed -n '/^#HELPME_START/,/^#HELPME_END/p' | grep -v "^#HELPME_" | grep -e "	-\|^#" | grep -- "$(echo $OPT_SHORT | sed -e "s/://g" | sed -e "s/\(.\)/\t-\1 \\\|/g" | sed -e "s/$/^#$COMMAND\t\\\|^#[A-Z]/" )" | sed -e "s/^#$COMMAND\t/\t/; s/^#//" 1>&2
	else
		echo -e "$1" 1>&2
	fi
	kill -s TERM $TOP_PID
}

OPTS=$(getopt -o hvf --long help,verbose,force -n daipture -- "$@")
eval set -- "$OPTS"
while :
do
	case "$1" in
#HELPME_START
#NAME
#	daipture, screen capturing tool
#SYNOPSIS
#	daipture [-h | --help] [-v | --verbose] [-f | --force] VIDEO
#OPTIONS
#EXAMPLE:
#	daipture demo.mp4
		-h | --help)
			helpme ;;
		-v | --verbose)
			set -x
			shift ;;
		-f | --force) #override the video file if it exists
			FORCE=yes
			shift ;;
#HELPME_END
		--)
			VIDEO=$2
			shift 2 || helpme "ERR-001: VIDEO filename is missing"
			break ;;
		*)
			break ;;
	esac
done

if [ -f "$VIDEO" ] 
then
	if [ "$FORCE" = "yes" ]
	then
		rm "$VIDEO"
	else
		helpme "ERR-002: $VIDEO already exists, use -f to override it"
	fi
fi
which xwininfo &> /dev/null || helpme "ERR-003: command xwininfo is missing"
which ffmpeg &> /dev/null || helpme "ERR-004: command ffmpeg is missing"
[ -n "$DISPLAY" ] || helpme "ERR-005: DISPLAY is not set, run it under x2go/vnc or local GUI"
echo "Please click the window you want to record to start, press q to quit when the capturing is done"
read X Y W H < <( xwininfo | grep "Width\|Height\|Absolute upper-left" |cut -d : -f 2 | sed -e "N;N;N;s/\n / /g" )
((H-=H%2))
((W-=W%2))
ffmpeg -f x11grab -r 25 -video_size ${W}x${H} -i $DISPLAY+$X,$Y -vcodec libx264 -crf 23 -profile:v baseline -level 3.0 -pix_fmt yuv420p -movflags faststart "$VIDEO"