#!/usr/pkg/bin/ruby193

dir = File.join(File.dirname(__FILE__), '..', 'lib')
$LOAD_PATH.unshift dir unless $LOAD_PATH.include?(dir)

require 'maruku'
require 'optparse'


def cli_puts(s)
  $stderr.puts(s) if MaRuKu::Globals[:verbose]
end

def benchmark(section)
  t = Time.now
  res = yield
  cli_puts("%s finished in %.2f seconds." % [section, Time.now - t])
  res
end

export = :html
break_on_error = false
using_math = false
using_mathml = false
output_file = nil

opt = OptionParser.new do |opts|
  opts.banner = "Usage: #{File.basename($0)} [options] [file1.md] [file2.md] ..."

  opts.on("-v", "--[no-]verbose", "Run verbosely") do |v|
    MaRuKu::Globals[:verbose] = v
  end

  opts.on("-u", "--[no-]unsafe", "Use unsafe features") do |v|
    MaRuKu::Globals[:unsafe_features] = v
  end

  opts.on("-b", "--[no-]break", "Break on error") do |v|
    break_on_error = v
  end


  opts.on("-i", "--math-images ENGINE", "Use ENGINE to render TeX to PNG") do |s|
    using_math = true
    MaRuKu::Globals[:html_math_output_png] = true
    MaRuKu::Globals[:html_math_output_mathml] = false
    MaRuKu::Globals[:html_png_engine] = s
    cli_puts "Using png engine #{s}."
  end

  opts.on("-m", "--math-engine ENGINE", "Use ENGINE to render MathML") do |s|
    MaRuKu::Globals[:html_math_output_png] = false
    MaRuKu::Globals[:html_math_output_mathml] = true
    using_math = true
    using_mathml = true
    MaRuKu::Globals[:html_math_engine] = s
  end

  opts.on("-o", "--output FILE", "Output filename (`-o -' writes to stdout)") {|s| output_file = s}

  opts.on_tail("--pdf", "Output PDF;", "first writes LaTeX, then calls pdflatex") {export = :pdf}
  opts.on_tail("--s5", "Output S5 slideshow") {export = :s5}
  opts.on_tail("--html", "Output HTML") {export = :html}
  opts.on_tail("--html-frag", "Output the contents of the <body> tag") {export = :html_frag}
  opts.on_tail("--tex", "Output LaTeX" ) {export = :tex}
  opts.on_tail("--markdown", "Output Markdown" ) {export = :markdown}
  opts.on_tail("--inspect", "Output the parse tree") {export = :inspect}

  opts.on_tail("--ext EXTENSIONS", "Use Maruku extensions (comma separated)") do |s|
    s.split(",").each {|e| require "maruku/ext/#{e}"}
  end

  opts.on_tail("-h", "--help", "Show this help message") do
    puts opts
    exit
  end

  opts.on_tail("--version", "Show version") do
    puts "Maruku #{MaRuKu::Version}"
    exit
  end
end

begin
  opt.parse!
rescue OptionParser::InvalidOption => e
  $stderr.puts e
  $stderr.puts opt
  exit 1
end


if using_math
  cli_puts "Using Math extensions."
  require 'maruku/ext/math'
end


unless ARGV.empty?
  if ARGV.size > 1 && output_file
    $stderr.puts "Can't write #{ARGV.map {|f| f.inspect}.join(' and ')} to #{output_file.inspect}"
    exit 1
  end

  # If we are given filenames, convert each file
  ARGV.map do |f|
    # read file content
    cli_puts "Reading from file #{f.inspect}."
    [f, File.read(f)]
  end
else
  export = :html_frag if export == :html
  export = :tex_frag if export == :tex

  cli_puts  "Reading from standard input."
  [[nil, $stdin.read]]
end.each do |filename, input|
  doc = benchmark("Parsing") {Maruku.new(input, :on_error => (break_on_error ? :raise : :warning))}

  out = ""
  suffix = "?"
  benchmark("Rendering") do
    case export
    when :html
      suffix = using_mathml ? '.xhtml' : '.html'
      out = doc.to_html_document
    when :html_frag
      suffix = '.html_frag'
      out = doc.to_html
    when :pdf, :tex
      suffix = '.tex'
      out = doc.to_latex_document
    when :tex_frag
      suffix = '.tex_frag'
      out = doc.to_latex
    when :inspect
      suffix = '.txt'
      out = doc.inspect
    when :markdown
      suffix = '.md'
      out = doc.to_md
    when :s5
      suffix = '_s5slides.html'
      out = doc.to_s5(:content_only => false, :print_slides => true)
    end
  end

  if (output_file.nil? && filename.nil?) || output_file == "-"
    if export == :pdf
      $stderr.puts "Can't write PDF to stdout"
      exit 1
    end

    cli_puts "Writing to standard output"
    $stdout.puts out
    next
  end

  if output_file
    job = File.basename(output_file, File.extname(output_file))
  else
    dir = File.dirname(filename)
    job = File.join(dir, File.basename(filename, File.extname(filename)))
    output_file = job + suffix
  end

  if export == :pdf
    cli_puts "Writing to #{job}.tex"
    File.open("#{job}.tex", 'w') {|f| f.puts out}
    cmd = ["pdflatex", "#{job}.tex", "-interaction=nonstopmode"]
    cmd << "-output-directory=#{dir}" if dir
    cli_puts "maruku: executing $ #{cmd.join(' ')}"

    # run twice for cross references
    system *cmd
    system *cmd
    next
  end

  cli_puts "Writing to #{output_file.inspect}"
  File.open(output_file, 'w') {|f| f.puts out}
end
