fish_weather.bash

function fish_greeting
  set_color green
  print_weather | cowsay
end

function print_weather
  if test -f .weather
    set time (head -n 1 .weather)
    set current (date +%s)
    set diff (math $current - $time)

    if [ $diff -ge 3600 ]
      get_weather
    else
      echo (sed '2q;d' .weather)
    end
  else
    get_weather
  end
end

function get_weather
  set -l weather (weatherme -k forecast-io-api-key -l 44.6646,-73.0090)
  printf '%s\n%s' (date +%s) $weather > .weather
  echo $weather
end

Dependencies

• weatherme
• cowsay
• sed

In get_weather you'll want to replace forecast-io-api-key with an actual API key which you can obtain from https://developer.forecast.io. You'll also want to set the lat, long unless you happen to live in Fairfax, Vermont.