Fix: meeting important dates can have markdown links

[evyncke]

To address feat #3911

Added a filter for the Django templates: 'markdown'

Data migration includes changing the important dates description to include the right markdown links.

Still to do (another issue to be created?) as some links in important dates include the actual meeting number :-(

[larseggert]

Why don't you use/call the code in ietf/utils/markdown.py?

[evyncke]

Because of a loop between the import statement (and no clue how to break this loop)

[evyncke]

In the same vein, I am unsure whether "toc" & "nl2br" extensions are useful or dangerous

[larseggert]

https://stackoverflow.com/a/7199514/2240756

[rjsparks]

I pushed a commit that moves the new filter to avoid the circular import (and simplifies it to use utils.markdown).

Tests don't pass, but it's not this PRs fault.

[evyncke]

I pushed a commit that moves the new filter to avoid the circular import (and simplifies it to use utils.markdown).

thanks, nicer indeed

[rjsparks]

See the failed test run - the changes are producing html that doesn't validate.

For example

                                 <td>
                                    Cut-off date for revised BOF proposal requests to Area Directors at UTC 23:59. To request a BOF, please see instructions at <a href="https://www.ietf.org/how/bofs/bof-procedures"></a><a href="https://www.ietf.org/how/bofs/bof-procedures&lt;/a>">https://www.ietf.org/how/bofs/bof-procedures</a> on Requesting a BOF.
                                                                                                                                                                 ^
                                                                                                                                                                 wcag/h30: Anchor link must have a text describing its purpose on line 721:162

[jennifer-richards]

See the failed test run - the changes are producing html that doesn't validate.

This was happening because the linkify filter was confusing the markdown filter. Reversing these avoids the problem and I think even does the right thing.

[evyncke]

This was happening because the linkify filter was confusing the markdown filter. Reversing these avoids the problem and I think even does the right thing.

Indeed ! Thanks