auto url formatting?

Hello!

I'm having a bear finding this, so I thought I'd just ask...

If I want to capture "website" as a user field (i.e. in a contacts
database)... is there an easy, automatic way to properly format it for
a link_to tag regardless of whether they include the "http" or not?
I.e. some helper or something that someone has that I could do
something like:

<%= link_to @user.website, format_url(@user.website) %>

And it would turn:

"www.google.com" # => "http://www.google.com/"

but also:

"http://www.google.com" # => "http://www.google.com/"

and:

"ftp://ftp.google.com" # => "ftp://ftp.google.com/"

I imagine there are some code snippits for doing this... I just
haven't found one yet.

Thanks!

-Danimal
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