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#!/bin/sh
cachefile="$HOME/.cache/weather"
location="Saint-Petersburg"
update_freq=1800
obsolete_after=10800
update_forecast() {
# Check several times before giving up, useful when just waking up from sleep
# since internet is usually not available right away
wget -q --tries=5 --timeout=20 --spider 1.1.1.1 > /dev/null || exit
forecast=$(curl -s wttr.in/"$location"?format=1)
if [ ${#forecast} -lt 30 ]; then
printf "%s\n" "$forecast" > "$cachefile"
fi
}
if [ -f "$cachefile" ]; then
last_modif=$(date +%s -r "$cachefile")
current_secs=$(date +%s)
elapsed=$((current_secs - last_modif))
if [ $elapsed -gt $obsolete_after ]; then
rm "$cachefile"
fi
if [ $elapsed -gt $update_freq ]; then
update_forecast
fi
else
update_forecast
fi
if [ ! -f "$cachefile" ]; then
exit
fi
cat "$cachefile"
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