Add code block, end two space to Exported Dropbox Paper markdown

Papermd2md.py

from pathlib import Path
import re
import codecs

def head_space(line):
    return re.match(r' {4}(.*)', line)

def head_hyphen(line):
    return re.match(r'- (\S.*)', line)

md_list = list(Path('.').glob('*.md'))
for md_file in md_list:
    filename_trimed = str(md_file)[:-3]
    if filename_trimed[-4:] != '.pub':
        with md_file.open() as md_lines:
            md_pub_list = []
            start_codeblock = True
            for line in md_lines:
                line = line.rstrip()
                if head_space(line) and start_codeblock:
                    # start codeblock
                    if not head_hyphen(line.lstrip()):
                        md_pub_list.append('```')
                        md_pub_list.append(head_space(line).group(1))
                        start_codeblock = False
                    else:
                        md_pub_list.append(line)
                elif head_space(line) and not start_codeblock:
                    # in codeblock tab only 1 strip
                    md_pub_list.append(head_space(line).group(1))
                elif not head_space(line) and not start_codeblock:
                    # end codeblock
                    md_pub_list.append('```')
                    md_pub_list.append(line)
                    start_codeblock = True
                else:
                    # not in codeblock
                    if not head_hyphen(line):
                        # add two space at the end of the line
                        md_pub_list.append(line + "  ")
                    else:
                        md_pub_list.append(line)
            if not start_codeblock:
                md_pub_list.append('```')
            print(*md_pub_list, sep="\n", file=codecs.open("{}.pub.md".format(filename_trimed), 'w', 'utf-8'))
            print("[+] File: {}.pub.md".format(filename_trimed))

Paper側のバグ、仕様によりうまくいかない部分が多いです。