mdlinks

#!/usr/bin/python

# /usr/local/bin/mdlinks: 
# To generate markdown links syntax.
# Get/change from hk0i/dotfiles/bin/mdlinks.

import re
import sys, os
from sets import Set

document = ''
for line in sys.stdin:
    document += line

link_pattern = re.compile(r'(\[([^\]]+)\]\[([^\]]*)\])', re.MULTILINE)
matches = link_pattern.findall(document)
document_links = Set()

if matches:
    for match in matches:
        link_title = match[1]
        link_refname = match[2]

        footer_text = ''

        if link_refname:
            footer_link = link_refname
        else:
            footer_link = link_title

        document_links.add(footer_link)

        # print "[{footer_link}]: ".format(footer_link = footer_link)

existing_link_pattern = re.compile(r'^\[([^\]]+)\]:', re.MULTILINE)
existing_links = existing_link_pattern.findall(document)

print document

if existing_links:
    for link in existing_links:
        if link in document_links:
            document_links.discard(link)
#        else:
#            sys.stderr.write('WARNING: found unused link in document: ' \
#                    '[{link}]\n'.format(link = link))


for link in document_links:
    print "[{link}]: ".format(link = link)