#!/bin/bash

# Prints date, time, weather. Only reads weather after "often" secs have passed. Needs "metar", and notice that "lhbp", that is, Budapest is used for weather data.
# Can use with gltext screensaver (/usr/share/applications/screensavers/gltext.desktop):
# Exec=gltext -root -front -program ~/bin/datumhom

#How often should we update the weather (in sec)?
often=300

#Echo the date and time
date +'%y.%m.%e %a, %H:%M'

# Do we have the dir?
if [ ! -d ~/.datumhom ]; then
 mkdir ~/.datumhom
fi

# Do we have the file?
if [ -e ~/.datumhom/hom.txt ]; then

# The file was refreshed at:
 refreshedat=`ls -l --time-style\=+%s ~/.datumhom/hom.txt | awk '{ print$6 }' `

# Time now is, then subtract $often:
 shouldhaverefreshed=`date +%s`
 let shouldhaverefreshed=$shouldhaverefreshed-$often

# If file is too old, refresh:
 if [ $refreshedat -lt $shouldhaverefreshed ]; then
  metar -d lhbp|awk '{ if ($1=="Temperature") print($3 "C"); if ($2=="speed") printf($4*1.6 "km/h; ") }' > ~/.datumhom/hom.txt
 fi
else
# If file doesn't exist, refresh:
 metar -d lhbp|awk '{ if ($1=="Temperature") print($3 "C"); if ($2=="speed") printf($4*1.6 "km/h; ") }' > ~/.datumhom/hom.txt
fi

#Print the file
cat ~/.datumhom/hom.txt