new_contents: #!/usr/bin/env python
  # encoding: utf-8
  
  from __future__ import absolute_import, unicode_literals, print_function
  from .text_exporter import TextExporter
  import re
  import sys
  import yaml
  
  
  class MarkdownExporter(TextExporter):
      """This Exporter can convert entries and journals into Markdown with YAML front matter."""
      names = ["yaml"]
      extension = "md"
  
      @classmethod
      def export_entry(cls, entry, to_multifile=True):
          """Returns a markdown representation of a single entry, with YAML front matter."""
          if to_multifile is False:
              print("{}ERROR{}: YAML export must be to individual files. Please specify a directory to export to.".format("\033[31m", "\033[0m", file=sys.stderr))
              return
  
          date_str = entry.date.strftime(entry.journal.config['timeformat'])
          body_wrapper = "\n" if entry.body else ""
          body = body_wrapper + entry.body
  
          '''Increase heading levels in body text'''
          newbody = ''
          heading = '###'
          previous_line = ''
          warn_on_heading_level = False
          for line in entry.body.splitlines(True):
              if re.match(r"#+ ", line):
                  """ATX style headings"""
                  newbody = newbody + previous_line + heading + line
                  if re.match(r"#######+ ", heading + line):
                      warn_on_heading_level = True
                  line = ''
              elif re.match(r"=+$", line) and not re.match(r"^$", previous_line):
                  """Setext style H1"""
                  newbody = newbody + heading + "# " + previous_line
                  line = ''
              elif re.match(r"-+$", line) and not re.match(r"^$", previous_line):
                  """Setext style H2"""
                  newbody = newbody + heading + "## " + previous_line
                  line = ''
              else:
                  newbody = newbody + previous_line
              previous_line = line
          newbody = newbody + previous_line   # add very last line
  
          if warn_on_heading_level is True:
              print("{}WARNING{}: Headings increased past H6 on export - {} {}".format("\033[33m", "\033[0m", date_str, entry.title), file=sys.stderr)
  
          # top = yaml.dump(entry)
  
          return "title: {title}\ndate: {date}\nstared: {stared}\ntags: {tags}\n{body} {space}".format(
              date=date_str,
              title=entry.title,
              stared=entry.starred,
              tags=', '.join([tag[1:] for tag in entry.tags]),
              body=newbody,
              space=""
          )
  
      @classmethod
      def export_journal(cls, journal):
          """Returns an error, as YAML export requires a directory as a target."""
          print("{}ERROR{}: YAML export must be to individual files. Please specify a directory to export to.".format("\033[31m", "\033[0m", file=sys.stderr))
          return
  
subject: Add YAML export