#!/bin/sh
#
# attempts to update the language settings in the user's ~/.profile config file

user=$1
language_list=$2
locale_name=$3

test -n "$user" || exit 0

# look up the user's home directory first
while read line; do
    [ "${line%%:*}" = $user ] && break
done < '/etc/passwd'
if [ -n "$line" ]; then
    OLDIFS=$IFS
    IFS=':'
    i=1
    for homedir in $line; do
        if [ $i -ne 6 ]; then
            i=$(( $i + 1 ))
            continue
        fi
        break
    done
    IFS=$OLDIFS
fi
if [ "$( echo $homedir )" = '' -o ! -d "$homedir" ]; then
    exit 0
fi

# create ~/.profile if it doesn't exist
test -f "$homedir/.profile" || {
    touch $homedir/.profile
    chown $user:$user $homedir/.profile
}

save_to_profile() {
    var=$1; value=$2
    if [ "$( grep "^[[:space:]]*export $var=" $homedir/.profile )" ]; then
        sed -r -i "s/^[[:space:]]*(export $var=).*/\1\"$value\"/" $homedir/.profile
    else
        echo "export $var=\"$value\"" >> $homedir/.profile
    fi
}
test -n "$language_list" && save_to_profile 'LANGUAGE' $language_list
test -n "$locale_name" && {
    save_to_profile 'LC_MESSAGES' $locale_name
    save_to_profile 'LC_CTYPE'    $locale_name
    save_to_profile 'LC_COLLATE'  $locale_name
}

exit 0