From: Sean O'Halpin <sean.ohalpin@...>
Date: 2005-10-19T03:22:41+09:00
Subject: Re: Expression Interpolation from input "template string"?

On 10/18/05, Kevin Ballard <kballard@gmail.com> wrote:
>
> Perhaps you should simply try using eRB to evalute your templates, so
> you could store "Hello, today is <%= msgDate %>"? Alternately, there's
> probably some other templating code out there, or you could write your
> own.

I agree - there are too many gotchas with a roll-your-own string
interpolation hack.
Also, Rails uses erb as one of its template options so you would be
compatible with that too. Here's some code to get you going:

require 'erb'

def erb(str, erb_binding)
  trim_mode = 1
  erb = ERB.new(str, $SAFE, trim_mode)
  erb.result(erb_binding)
end

src = "Hello, today is <%= msg_date %>"
msg_date = Time.now.strftime("%Y-%m-%d")
puts erb(src, binding)

#=> Hello, today is 2005-10-18

Regards,

Sean