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/usr/bin/hikidoc is in ruby-hikidoc 0.1.0-2.

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#!/usr/bin/ruby

require 'hikidoc'
require 'optparse'
require 'erb'

HTML_TEMPLATE = <<EOS
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
<head>
<title><%= title %></title>
</head>
<body>
<%= body %>
</body>
</html>
EOS

options = {}
format_options = {}
ARGV.options do |opts|
  opts.banner = "Usage: #$0 [OPTIONS] FILE"

  opts.on('-f', '--fragment',
          'Output HTML fragments only') do
    options[:fragment] = true
  end
  opts.on('-t', '--template=TEMPLATE',
         'Specify a HTML template file') do |template|
    options[:template] = template
  end
  opts.on('--no-wikiname', 'Disable WikiName link') do
    format_options[:use_wiki_name] = false
  end

  opts.parse!
end

case ARGV.size
when 0
  title, text = '-', $stdin.read
when 1
  title, text = ARGV[0], File.read(ARGV[0])
else
  usage
end

body = HikiDoc.to_html(text, format_options)

def result(erb, title, body, text)
  erb.result(binding)
end

if options[:fragment]
  puts(body)
else
  template = options[:template]
  if template
    source = File.read(template)
  else
    source = HTML_TEMPLATE
  end
  erb = ERB.new(source)
  erb.filename = template
  puts(result(erb, title, body, text))
end