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#!/usr/bin/ruby
require 'html/pipeline'

require 'optparse'

# Accept "help", too
ARGV.map!{|a| a == "help" ? "--help" : a }

OptionParser.new do |opts|
  opts.banner = <<-HELP.gsub(/^    /, '')
    Usage: html-pipeline [-h] [-f]
           html-pipeline [FILTER [FILTER [...]]] < file.md
           cat file.md | html-pipeline [FILTER [FILTER [...]]]
  HELP

  opts.separator "Options:"

  opts.on("-f", "--filters", "List the available filters") do
    filters = HTML::Pipeline.constants.grep(/\w+Filter$/).
      map{|f| f.to_s.gsub(/Filter$/,'') }

    # Text filter doesn't work, no call method
    filters -= ["Text"]

    abort <<-HELP.gsub(/^      /, '')
      Available filters:
        #{filters.join("\n        ")}
    HELP
  end
end.parse!

# Default to a GitHub-ish pipeline
if ARGV.empty?

  filters = [
    HTML::Pipeline::MarkdownFilter,
    HTML::Pipeline::SanitizationFilter,
    HTML::Pipeline::ImageMaxWidthFilter,
    HTML::Pipeline::EmojiFilter,
    HTML::Pipeline::AutolinkFilter,
    HTML::Pipeline::TableOfContentsFilter,
  ]

  # Add syntax highlighting if linguist is present
  begin
    require 'linguist'
    filters << HTML::Pipeline::SyntaxHighlightFilter
  rescue LoadError
  end

else

  def filter_named(name)
    case name
    when "Text"
      raise NameError # Text filter doesn't work, no call method
    end

    HTML::Pipeline.const_get("#{name}Filter")
  rescue NameError => e
    abort "Unknown filter '#{name}'. List filters with the -f option."
  end

  filters = []
  until ARGV.empty?
    name = ARGV.shift
    filters << filter_named(name)
  end

end

context = {
  :asset_root => "/assets",
  :base_url   => "/",
  :gfm        => true
}

puts HTML::Pipeline.new(filters, context).call(ARGF.read)[:output]