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Monday, December 20, 2010

Day Glow Background for Ubuntu

I work in a cubicle. Waa, waa, poor me. To combat this, I got the idea to write a script that will raise and lower the brightness of my desktop background with the time of day. When it's dark outside, my desktop is dark. When it's light outside, so is my desktop. Below is the script to accomplish this and the content of an HTML file to help you find your WOEID:
day_glow.sh

#!/bin/bash
#
# to make this work:
# 1 - $ sudo apt-get install imagemagick
# 2 - Extract this ZIP to your hard drive
# 3 - $ chmod +x day_glo.sh
# 4 - $ ./day_glo.sh picture max min woeid
# - picture = path to the background picture that you use \
#      this script will create a <picture>.glow file \
#      which should be set as your background
# - max = an integer value for the maximum brightness you \
#  want during the brightest part of the day
# - min = same as max, but during the darkest part of the day \
#  I find that a max of 100 & min of 25 do nicely
# - woeid = this is your location identifier as Yahoo understands it \
#  you can fire up the included 'woeid.html' file to find \
#  the number for your location
# 5 - $ crontab -e
# - every hour = "0 * * * * /path/to/day_glow.sh /path/to/background.jpg 100 25 12799337"
# - this will run the script on the hour, every hour
# - "/path/to/day_glo.sh" = file path to this script
# - "/path/to/background.jpg" = the image to be used as the backgorund \
#          the script will output to "/path/to/background.jpg.glow" \
#          which should be set as your background
# - "100 25" = this sets the max brightness to 100 (midday) & min to 25 (midnight)
# - "12799337" = WOEID for Vancouver, Washington - check woeid.html for yours

NOW=$(date +%s)
PIC=$1
MAX=$2
MIN=$3
WOEID=$4
 
wget -q http://weather.yahooapis.com/forecastrss?w=$WOEID -O- | \
 grep astronomy | \
 sed -E 's/.*sunrise="([^ ]*) am"   sunset="([^ ]*) pm"\/>/\1 \2/' | \
while read -r SUNUP SUNDN; do
 SUNUP_DTS=$(date "+%Y-%m-%d $SUNUP:00")
 SUNDN_DTS=$(date "+%Y-%m-%d $(( ${SUNDN%${SUNDN: -3}} + 12 )):00")
 SUNUP_EPC=$(date --date="$SUNUP_DTS" +%s)
 SUNDN_EPC=$(date --date="$SUNDN_DTS" +%s)
 
 HALFDAY=$(( ($SUNDN_EPC-$SUNUP_EPC)/2 ))
 MIDDAY=$(( $HALFDAY+$SUNUP_EPC ))
 
 if [[ $NOW > $MIDDAY ]]; then
  DIFF=$(( $NOW-$MIDDAY ))
 elif [[ $MIDDAY > $NOW ]]; then
  DIFF=$(( $MIDDAY-$NOW ))
 fi
 
# UPDATE - ADDED THIS BLOCK TO PREVENT FULL BLACKNESS
 if [[ $DIFF -gt $HALFDAY ]]; then
  DIFF=$HALFDAY
 fi

 PERC=$(( 100-(100*$DIFF/$HALFDAY) ))
 
 SCALE=$(( $MAX-$MIN ))
 VAL=$(( ($PERC*$SCALE/100)+$MIN ))
 
 convert -modulate $VAL,100,100 $PIC $PIC.glow

done


woeid.html

<html>
 <head>
  <title>Ben's Really Simple WOEID Converter</title>
  <script type='text/javascript' src='http://code.jquery.com/jquery-1.4.4.min.js'></script>
  <script type='text/javascript'>
   function lookup_woeid() {
    var place = encodeURI($('#place').val());
    $.getJSON(
     'http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20geo.places%20where%20text%3D%22'+place+'%22&format=json',
     function(data) {
      $('#output').html('');
      if (data.query.count == 0) {
       return false;
      } else if (data.query.count == 1) {
       var place = data.query.results.place;
       $('<tr><td>'+place.woeid+'</td><td>'+place.name+'</td><td>'+place.admin1.content+'</td></tr>')
        .appendTo('#output');
      } else {
       var places = data.query.results.place;
       for (var p in places) {
        place = places[p];
        $('<tr><td>'+place.woeid+'</td><td>'+place.name+'</td><td>'+place.admin1.content+'</td></tr>')
         .appendTo('#output');
       }
      }
     }
    );
   }
  </script>
 </head>
 <body>
  <table style='height:100%;width:100%;'>
   <tr style='height:50%;'>
    <td valign='middle'>
     <center>
      Place Name or ZIP:
      <input type='text' id='place' />
      <br>
      <button onClick='lookup_woeid()'>find it</button>
     </center>
    </td>
   </tr>
   <tr>
    <td>
     <center>
      <table border='1px'>
       <thead>
        <tr>
         <th>WOEID</th><th>Name</th><th>Place</th>
        </tr>
       </thead>
       <tbody id='output'>
       </tbody>
      </table>
     </center>
    </td>
   </tr>
  </table>
 </body>
</html>
at 1:37 PM

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