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Running Erb Templates From The Command Line

03.20.2006
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        The following script takes the name of a template as it's argument. Within the
template the command <b>erb</b> is in scope to call more templates. I wrote this for a friend who was having hell with NVU templates and I suggested to write the code by hand and use this script to build his static pages.

#!/usr/bin/ruby
# Quick and dirty template processing script. It takes
# as an argument the name of the first template script
# and then executes it to standard output.

require "erb"


class QuickTemplate
   attr_reader :args, :text
   def initialize(file)
      @text = File.read(file)
   end
   def exec(args={})
      b = binding
      template = ERB.new(@text, 0, "%<>")
      result = template.result(b)
      # Chomp the trailing newline
      result.gsub(/\n$/,'')
   end
end

def erb(file, args={})
   QuickTemplate.new(file).exec(args)
end

puts erb(ARGV[0])

The erb command itself takes an optional argument of a hash which is passed to the template as the
variable name <b>args</b>. Thus you can parameterize your sub templates. 

Call the command as

ruby erb_run.rb main.thtml

The main template

<html>
   <head>
   </head>
   <div>
    <%= erb("title.thtml") %>
   </div>
</html>

and the sub template <b>title.thtml</b>

<title> This is Alex's cool restraunt</title>
    

Comments

Snippets Manager replied on Sun, 2012/04/22 - 4:46am

Hi, I extended this code to get the binding from Facter[1], which is a tool used by Puppet[2] to fill in the variables in ERB templates based on system information (e.g. FQDN or hostname). This in turn allowed me to reuse my Puppet ERB templates in external, non-Ruby programs such as Fabric[3]. Long story short... do you mind releasing this code under, say, FreeBSD license, so that I can legally extend and distribute it? I'll publish the modified code here, obviously. [1] [2] [3]