#! /bin/sh

case "$0" in
    */get_encodings)
        sourced=false
        ;;
    *)
        sourced=true
        ;;
esac

from_encoding=
to_encoding=
default_encoding="`python3 -c \"from m_lib.defenc import default_encoding; print(default_encoding)"`"

while getopts f:t: opt; do
   case $opt in
      f ) from_encoding="$OPTARG" ;;
      t ) to_encoding="$OPTARG" ;;
   esac
done
shift `expr $OPTIND - 1`

error() {
    echo "$@" >&2
    echo "Usage: $0 [-f from_encoding] [-t to_encoding] [path [path ...]]" >&2
    exit 1
}

if [ -n "$from_encoding" ]; then
    if [ -n "$to_encoding" ]; then
        : # Everything is defined, no need to guess
    elif [ "$from_encoding" = utf-8 ]; then
        if [ "$default_encoding" = utf-8 ]; then
            error Cannot guess to_encoding
        else
            to_encoding="$default_encoding"
        fi
    else
        to_encoding=utf-8
    fi
elif [ -n "$to_encoding" ]; then
    if [ "$to_encoding" = "$default_encoding" ]; then
        if [ "$default_encoding" = utf-8 ]; then
            error Cannot guess from_encoding
        else
            from_encoding=utf-8
        fi
    else
        from_encoding="$default_encoding"
    fi
else
    if [ "$default_encoding" = utf-8 ]; then
        error Cannot guess encodings
    else
        from_encoding="$default_encoding"
        to_encoding=utf-8
    fi
fi

if [ "$sourced" = false ]; then
    echo "$from_encoding $to_encoding"
fi