#!/bin/bash

# scr - for os x
# Takes a screenshot, resizes it, and uploads it to a webpage. It's meant to 
# be run with cron, by customizing and adding the following line to your 
# crontab:
#
# */1     *       *       *       *       /Path/to/scr 0 > /dev/null 2>&1
#
# that line will run scr, with no delay, once a minute. once it is added it 
# can be "turned on and off" within the script. 
# run scr with no options for help.

############################################################################

# defaults:
# Where we want to upload the jpg, user@server:path/to/file.jpg
# Width of resized jpg

LOCATION="cutup@cutup.org:cutup.org/screen.jpg"
WIDTH="350"

###########################################################################

# status 

function status {
 if [ "$(crontab -l | awk '/scr/' | awk '/^#/')" ]; then
  echo " off"
 else
  echo " on"
 fi
}

# comment crontab entry out

function cronoff {
 crontab -l | sed '/\/scr /s/^/#/' > tempcron
 crontab tempcron
 rm tempcron
 crontab -l
}

# uncomment crontab entry

function cronon {
 crontab -l | sed '/\/scr /s/^#//' > tempcron
 crontab tempcron
 rm tempcron
 crontab -l
}

# capture and upload

function capture {  
 sleep "$1"
 try=$(ps -c -U $(whoami) | awk '/ScreenSaver/')
 if [ "$try" ]; then 
  echo "screensaver on"
 else
  /usr/sbin/screencapture -C temp_screen_cap.jpg
  /usr/bin/sips --resampleWidth "$2" --setProperty format jpeg --setProperty formatOptions low temp_screen_cap.jpg --out "temp_screen_cap.jpg"
  scp "temp_screen_cap.jpg" "$3"
  rm "temp_screen_cap.jpg"
 fi 
}

# help message

function help {
cat << EOF
 $(basename $0) [ on | off | ? | delay [width] [location] ]
    takes snapshot and uploads it
        delay - in seconds
        width - width in pixels of resulting jpg, delay must be set
        location - full path to remote location, size and delay must be set  
    on  - uncomments entry in crontab 
    off - comments out entry in crontab
    ?   - status of crontab (off or on)
EOF
}

case "$1" in
 "?"   ) status ; exit;;
 "on"  ) cronon ; exit;;
 "off" ) cronoff ; exit;;
esac

if [ $1 ] && [ $2 ] && [ $3 ]; then
 capture $1 $2 $3
elif [ $1 ] && [ $2 ]; then
 capture $1 $2 $LOCATION
elif [ $1 ]; then
 capture $1 $WIDTH $LOCATION
else
 help $0
fi