it works

blog.rb

#!/usr/local/rvm/rubies/ruby-2.0.0-p247/bin/ruby
require 'fileutils'
require 'optparse'
require 'redcarpet'
current_time = Time.now
@pdir = "posts"
@output = "/var/www/blog/posts"
@template = "<center>Title:
<br>Date: **#{current_time}**
</center>"
files = Dir.entries("#{@pdir}").select { |f| File.file?(f) }
options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: blog.rb [options]"

  opts.on("-n", "New file") do |v|
    options[:verbose] = v
    @filename = ARGV.to_s
    @filename = @filename.gsub("[","").gsub("]","").gsub('"',"")
    FileUtils.touch("#{@pdir}/#{@filename}")
    File.open("#{@pdir}/#{@filename}", 'w') { |file| file.write(@template) }
  end

 opts.on("-p", "Parse") do |v|
    options[:verbose] = v
   Dir.glob("#{@pdir}/*") do |post_file|
   #puts post_file
   text = File.read(post_file)
   markdown = Redcarpet.new(text)
   new = post_file.gsub("posts/","")
   File.open("#{@output}/#{new}.html", 'w') {|f| f.write(markdown.to_html) }
  end
  end
 opts.on("-u", "Update Index") do |v|
    options[:verbose] = v
   Dir.glob("#{@output}/*") do |post_link|
   post_link = post_link.gsub("/var/www/blog/","")
   File.open('/var/www/blog/index.html', 'w') { |file| file.write("<center><a href=\"#{post_link}\">#{post_link}</a></center>") }
end
end
end.parse!