high speed screenshot and upload utility

screenshot.sh

#!/bin/bash
#
# Copyright 2013 John Leach <john@johnleach.co.uk>
#
# Distributed under terms of the MIT license
#
# Takes a screeshot using scrot and uploads it via scp and sticks the
# url on the clipboard as quickly as possible.
#
# For speed, it cheats and puts the url on the clipboard *before*
# uploading.
#
# Requires the scrot screenshot tool, scp, sha256sum, xclip and
# notify-send.  Rquires ruby too, but a bit unecessarily.
#

set -e

URLBASE="http://example.com/screenshots"
SCPURL="user@example.com:www/screenshots"

if [ -d /dev/shm ] ; then
		TMPDIR="/dev/shm"
else
		TMPDIR=$TMP
fi

# FIXME: unsafe, use mktemp instead
TMPFILE="$TMPDIR/scrot-${USER}-`date +"%s"`.png"

sleep 0.1 # needed due to a bug in gnome-shell with keyboard focus

scrot -s $TMPFILE

CSUM=`sha256sum $TMPFILE | ruby -e 'puts STDIN.read.to_i(16).to_s(36)'`

FILENAME=`date +%Y%m%d`-${CSUM}.png
URL=$URLBASE/${FILENAME}

echo -e "`date`:\t$TMPFILE\t$URL" >> $HOME/screenshot.log

echo $URL  | xclip

scp $TMPFILE $SCPURL/${FILENAME} && 
/usr/bin/notify-send -t 2000 -u low "Screenshot uploaded successfully" &&
rm $TMPFILE