Option to convert .md links to .html

[venthur]

Hi,

when converting a tree of markdown documents with internal links, it would be useful to convert the link targets from .md to .html as well.

E.g.:

[some link](link.md)

should point to link.html. I understand that that might not be the desired default behavior but it would surely be a useful addition.

[facelessuser]

You could certainly write an extension to handle this, but this is not standard Markdown behavior, so you are unlikely to see this integrated by default in Python Markdown.

[ricmua]

Not sure if you resolved this, @venthur, and I didn't see any extensions. I have similar need / desire and I think this does what we want:

import os
from markdown import markdown
from markdown import Extension
from markdown.inlinepatterns import LinkInlineProcessor
from markdown.inlinepatterns import LINK_RE

class CustomLinkInlineProcessor(LinkInlineProcessor):
    
    def getLink(self, *args, **kwargs):
        (href, title, index, handled) = super().getLink(*args, **kwargs)
        parts = os.path.splitext(href)
        ext = '.html' if (parts[1] == '.md') else parts[1]
        href = ''.join((parts[0], ext))
        return (href, title, index, handled)
    
  

class CustomLinkExtension(Extension):
    
    def extendMarkdown(self, md):
        md.inlinePatterns.deregister('link')
        pattern = CustomLinkInlineProcessor(LINK_RE, md)
        md.inlinePatterns.register(pattern, 'link', 160)
        

data  = 'Some text and a [link](path/to/a/document.md).\n'
data += 'And a [normal link](http://www.google.com/image.jpg).\n'
data += 'More text.'
html = markdown(data, extensions=[CustomLinkExtension()])
print(f'ORIGINAL:\n{data}\nCONVERTED:\n{html}')

I'm brand new to Python-Markdown as of yesterday, and I haven't (yet) packaged / tested this well.

EDIT: Created a repository for this.

[venthur]

Interesting, i solved it slightly differently using a TreeProcessor:

class MarkdownLinkTreeprocessor(Treeprocessor):
    """Converts relative links to .md files to .html
    """

    def run(self, root):
        for element in root.iter():
            if element.tag == 'a':
                url = element.get('href')
                converted = self.convert(url)
                element.set('href', converted)
        return root

    def convert(self, url):
        scheme, netloc, path, query, fragment = urlsplit(url)
        logger.debug(
            f'{url}: {scheme=} {netloc=} {path=} {query=} {fragment=}'
        )
        if (scheme or netloc or not path):
            return url
        if path.endswith('.md'):
            path = path[:-3] + '.html'

        url = urlunsplit((scheme, netloc, path, query, fragment))
        return 

[ricmua]

Excellent. Thank you.

[ricmua]

Created a simple extension repository.