Simple script to create gifs and screenshots (depends on out file extension) of selected part of the screen.

catch

#!/bin/bash
#
# Author: Benedykt 'b3niup' Przybyło
# Date: 2015-07-02
#
# Required: curl, scrot, ffmpeg, ffcast (https://github.com/lolilolicon/FFcast)
#
# Simple script to create gifs and screenshots (depends on out file extension) of selected part of the screen.
#

readonly PROGNAME=$(basename $0)
readonly PROGDIR=$(readlink -m $(dirname $0))
readonly ARGS="$@"


readonly IMGUR_CLIENTID=""  # register at https://api.imgur.com/oauth2/addclient


usage() {
	cat <<- EOF
		usage: $PROGNAME [options] <out>
		
		OPTIONS
			-d <n> - delay before screenshot/recording
			-u     - upload to imgur

		Depending on out file extension animated gif or static image will be created from selected part of the screen.
	EOF
	exit 1
}

mkgif() {
	local out=$1
	local delay=${2:-10}
	local tmp_avi=$(mktemp /tmp/outXXXXXXXXXX.avi)

	ffcast -s % ffmpeg -y -f x11grab -show_region 1 \
		-framerate 15 -video_size %s -i %D+%c -codec:v huffyuv      \
		-vf crop="iw-mod(iw\\,2):ih-mod(ih\\,2)" $tmp_avi

	convert -set delay $delay -layers Optimize $tmp_avi $out
	rm $tmp_avi
}

mkscreen() {
	local out=$1
	scrot -s $out
}

upload() {
	local file=$1
	local url
	local deleteurl
	local response

	# upload the image
	response=$(curl -H "Authorization: Client-ID $IMGUR_CLIENTID" \
				-F "image=@$file" https://api.imgur.com/3/upload 2>/dev/null)

	if [[ $(grep '"status":200' <<< $response) ]]; then
		url=$(sed -e 's/.*"link":"\([^"]*\).*/\1/' -e 's/\\//g' <<< $response)
		deleteurl=$(sed -e 's/.*"deletehash":"\([^"]*\).*/\1/' <<< $response)
		deleteurl="http://imgur.com/delete/${deleteurl}"

		echo "Direct link: $url"
		echo "Delete page: $deleteurl"
	else
		echo $response
		exit 3
	fi

}

main() {
	local o
	local delay
	local upload

	while getopts ":d:u" o; do
		case $o in
			d)
				delay=${OPTARG};;
			u)
				[[ -z $IMGUR_CLIENTID ]] && echo "You need to define IMGUR_CLIENTID && exit 2
				upload=upload;;

		esac
	done
	shift $((OPTIND-1))

	local out=$1
	[[ -z $out ]] && usage
	
	set -e 
	case ${out#*.} in
		gif)
			mkgif $out $delay;;
		png|jpg)
			mkscreen $out;;
		*)
			usage;;
	esac

	[[ $upload ]] && upload $out

	set +e
}

main $ARGS