class Symbol
  def to_proc
    Proc.new { |*args| args.shift.__send__(self, *args) }
  end
end

module Format
  Pdf_Error = "Please Modify ~/.yacrc To Provide A Valid Command To Operate PDF Document"
  Image_Error = "Please Modify ~/.yacrc To Provide A Valid Command To Operate Image Document"
  Doc_Error = "Please Modify ~/.yacrc To Provide A Valid Command To Operate Text Document"

  def format_file(file)
    @level = 0
    colorful(file,"filename") if file
    case `file "#{file}" 2>/dev/null`
    when / PDF document/
      puts Pdf_Error unless system("#{Yac::CONFIG["pdf_command"]||'evince'} \"#{file}\" 2>/dev/null")
    when /( image )|(\.svg)/
      puts Image_Error unless system("#{Yac::CONFIG["image_command"]||'eog'} \"#{file}\" 2>/dev/null")
    else
      File.new(file).each do |x|
        format_section(x)
      end
    end
  rescue
  end

  def format_section(section,search = false)
    case section
    when /^(=+)\s+(.*)/
      @level = search ? 1 : $1.size
      colorful("\s"*2*(@level-1) + $2,"head#{@level}")
    when /^(\s*)#/
      colorful(section.sub(/^\s*/,'')) if search
    else
      colorful(section.sub(/^\#/,"#").sub(/^\s*/, "\s" * ( @level||0 ) * 2 ))
    end
  end

  def edit_file(file)
    case `file "#{file}" 2>/dev/null`
    when / PDF /
      puts Pdf_Error unless system("#{Yac::CONFIG["pdf_edit_command"]||'ooffice'} \"#{file}\" 2>/dev/null")
    when /( image )|(\.svg)/
      puts Image_Error unless system("#{Yac::CONFIG["image_edit_command"]||'gimp'} \"#{file}\" 2>/dev/null")
    else
      edit_text(file)
    end
  end

  def edit_text(file)
    prepare_dir(file)
    puts Doc_Error unless system("#{Yac::CONFIG["editor"] || ENV['EDITOR'] ||'vim'} \"#{file}\" 2>/dev/null")
  end

  def colorful(stuff,level="text",line_break = true)
    stuff = empha(stuff,level)
    print "\e[%sm%s\e[0m " % [Yac::CONFIG[level],stuff.rstrip]
    print "\n" if line_break
  end

  def empha(stuff,level="text",empha_regexp=/(@@@(.*)@@@)/)
    stuff.to_s.scan(empha_regexp) do |x|
      return stuff.gsub(x[0],"\e[0m\e[#{Yac::CONFIG["empha"].to_s}m%s\e[0m\e[%sm" % [x[1],Yac::CONFIG[level]])
    end
  end

  def prepare_dir(file)
    dirseparator = file.rindex(File::Separator)+1
    FileUtils.mkdir_p(file[0,dirseparator])
  end
end