#!/bin/sh

## Original command:
# curl -A "Mozilla/5.0" 'http://translate.google.com/translate_a/t?client=t&text=hello&hl=en&sl=en&tl=zh-CN&ie=UTF-8&oe=UTF-8&multires=1&prev=btn&ssel=0&tsel=0&sc=1' | sed 's/\[\[\["\([^"]*\).*/\1/'

_printhelp ()
{
    cat<<EOF
Usage: ${1##*/} [-i source-language] target-language [text]

The language are specified using the international prefix (e.g. en for English,
de for German, etc.).

When omitting the source language, the service tries to guess the language from
the input content.

When omitting the text, standard input is read.

Synopsis.

  -h:  Show this help.
  -i:  input language (optional).

EOF
}

unset SL
while getopts ":hi:" opt; do
    case $opt in
        h)
            _printhelp "$0"
            exit 1
            ;;
        i)
            SL="$OPTARG" ;;
        ?)
            _printhelp "$0"
            exit 1
            ;;
        :)
            _printhelp "$0"
            exit 1
            ;;
    esac
done

shift $(($OPTIND - 1))

if [ $# -eq 0 ]; then
    _printhelp "$0"
    exit 1
fi

TL=$1

shift

_translate()
{
    TEXT="$(echo "$@" | tr '\n' ' ' | sed 's/[\t ]\+/%20/g')"

    if [ "$SL" = "" ]; then
        curl -A "Mozilla/5.0" 'http://translate.google.com/translate_a/t?client=t&text='$TEXT'&tl='$TL'&ie=UTF-8&oe=UTF-8'
    else
        curl -A "Mozilla/5.0" 'http://translate.google.com/translate_a/t?client=t&text='$TEXT'&sl='$SL'&tl='$TL'&ie=UTF-8&oe=UTF-8'
    fi 2>/dev/null | sed 's/\[\[\["\([^"]*\).*/\1/'

    echo
}

if [ $# -ne 0 ]; then
    _translate "$@"
else
    _translate "$(cat)"
fi