C2K

C2K

#!/usr/bin/env bash
# Valerio Pizzi (Pival81) <pival81@yahoo.com>

set -u
set -e

# Checks the system language, and stores it in the script_locale variable.

script_locale=$(locale | grep LANG | cut -d= -f2 | cut -d_ -f1)

# A function to set the the script language using the script_locale variable.

function setlocale () {
if [ $script_locale = it ]; then
	if [ $(basename $0) = c2k ]; then
		descri="Questo script serve a convertire da gradi Celsius a Kelvin."
	elif [ $(basename $0) = k2c ]; then
			descri="Questo script serve a convertire da gradi Kelvin a Celsius."
	fi
	dotcomma="SE DEVI UTILIZZARE NUMERI DECIMALI USA IL PUNTO, NON LA VIRGOLA."
	exit="Se si vuole uscire, basta digitare 'esci' al posto del valore."
	howtoconv="scegli come vuoi convertire:"
	cvalue="Inserisci il valore dei °C."
	kvalue="Inserisci il valore dei °K."
	c2k="°C corrispondono a"
	k2c="°K corrispondono a"
elif [ $script_locale = en ] ||  [ $script_locale != it ]; then
	if [ $(basename $0) = c2k ]; then # The description changes according to how the script is invoked.
		descri="This script converts °C to °K."
	elif [ $(basename $0) = k2c ]; then
			descri="This script converts °K to °C."
	fi
	dotcomma="IF YOU HAVE TO USE DECIMAL NUMBERS USE THE DOT, NOT THE COMMA."
	exit="If you want to exit, just type 'exit' instead of the value."
	howtoconv="choose how you want to convert:"
	cvalue="Insert the value of °C."
	kvalue="Insert the value of °K."
	c2k="°C correspond to"
	k2c="°K correspond to"
fi
}

# Initiate the script.

function executescript () {
echo -e "$descri"
echo 
echo "$dotcomma"
echo "$exit"
echo 

# Set the mode by checking how the script is invoked.

if [ $(basename $0) = c2k ]; then
	echo "$cvalue"
	echo -n "--> "
	read value
	if [ -z "$value" ] ||  [ "$value" = "esci" ] ||  [ "$value" = "exit" ]; then
		exit
	fi
	result=$(echo "scale=2; $value+273.15" | bc)
	echo "${value}$c2k ${result}°K"
elif [ $(basename $0) = k2c ]; then
	echo "$kvalue"
	echo -n "--> "
	read value
	if [ -z "$value" ] ||  [ "$value" = "esci" ] ||  [ "$value" = "exit" ]; then
		exit
	fi
	result=$(echo "scale=2; $value-273.15" | bc)
	echo "${value}$k2c ${result}°C"
fi
}

# If the script is invoked using the -l option, force the script to open using the language specified after -l .

while getopts ":l:" opt; do
  case $opt in
    l)
      script_locale=$OPTARG
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
      ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      exit 1
      ;;
  esac
done

setlocale		# A call to the setlocale function, to set all the phrases to the preferred languages.
executescript		# A call to the executescript function, to do all the math.
exit			# Just exit and forget this hell.