#! /bin/bash

main() {
  case "$1" in
    (--help)
      echo "report temperature in K, °C, °R, or °F."
    ;;
    (-C|--celsius)
      espeak_inside `inside_temp 'x - 273.15'` Grad Zelsius
      espeak_outside `outside_temp 'x - 273.15'` Grad Zelsius
    ;;
    (-F|--fahrenheit)
      espeak_inside `inside_temp 'x * 9/5 - 459.67'` Grad Fahrenheit
      espeak_outside `outside_temp 'x * 9/5 - 459.67'` Grad Fahrenheit
    ;;
    (-R|--rankine)
      espeak_inside `inside_temp 'x * 9/5'` Grad Renkin
      espeak_outside `outside_temp 'x * 9/5'` Grad Renkin
    ;;
    (-K|--kelvin|*)
      espeak_inside `inside_temp` Kelvin
      espeak_outside `outside_temp` Kelvin
    ;;
  esac
}

## temp [<formula with temperature as x>]
## Echo temperature in K.  If formula is given then return that result instead.
inside_temp() {
  echo "scale=2; x=`/krebs/temper/temper` + 273.15; ${1-x}" | bc
}

outside_temp() {
  echo "scale=2; x=`dig +short txt outside.elwood.temp.citecs.de |
          sed 's/^"DEG \([0-9]\+\.[0-9]\+\)"$/\1/'
       ` + 273.15; ${1-x}" | bc
}

espeak_inside() {
  echo Die Krebs-tempera-tur beträgt $@ | to_espeak
}

espeak_outside() {
  echo Die Außen-tempera-tur beträgt $@ | to_espeak
}

to_espeak() {
  sed '
    s/\(\.[0-9]\)0\+/\1/g
    s/\(\.[0-9]\)\([0-9]\)[0-9]*/ \1 \2 /;
    s/^-/minus /;
    s/\./ komma /;
  ' | tee $NOISE_linefeed
}

main "$@"