#!/usr/bin/env ruby
# Usage: commonmarker [--html-renderer] [--list-extensions] [--extension=EXTENSION] [FILE..]
# Convert one or more CommonMark files to HTML and write to standard output.
# If no FILE argument is provided, text will be read from STDIN.
# With --html-renderer, use the HtmlRenderer renderer rather than the native C
# renderer.
# With --extension=EXTENSION, EXTENSION will be used for parsing, and HTML
# output unless --html-renderer is specified.
if ARGV.include?('--help') or ARGV.include?('-h')
  File.read(__FILE__).split("\n").grep(/^# /).each do |line|
    puts line[2..-1]
  end
  exit 0
end

$LOAD_PATH.unshift File.join(File.dirname(__FILE__), *%w( .. lib ))
require 'commonmarker'

if ARGV.include?('--version') or ARGV.include?('-v')
  puts "commonmarker #{CommonMarker::VERSION}"
  exit 0
end

root = File.expand_path('../../', __FILE__)
$:.unshift File.expand_path('lib', root)

extensions = CommonMarker.extensions
active_extensions = []

renderer = nil
ARGV.delete_if do |arg|
  if arg =~ /^--html-renderer$/
    renderer = CommonMarker::HtmlRenderer.new
    true
  elsif arg =~ /^--list-extensions$/
    puts extensions
    exit 0
  elsif arg =~ /^--extension=(.+)$/
    if extensions.include?($1)
      active_extensions << $1.intern
    else
      STDERR.puts "extension #$1 not found"
      exit 1
    end
    true
  else
    false
  end
end

doc = CommonMarker.render_doc(ARGF.read, :default, active_extensions)

if renderer
  STDOUT.write(renderer.render(doc))
else
  STDOUT.write(doc.to_html(:default, active_extensions))
end