Support footnotes

[nomicode]

I would love to be able to use footnotes with Org on Github. How feasible is this?

[wallyqs]

There is already some footnotes support in the parser, can you give some feedback on which parts of footnotes support needs improvement? I will also revisit the feature as well with latest Org mode changes..
https://github.com/wallyqs/org-ruby/blob/master/spec/html_examples/footnotes.org

[nomicode]

Oh wow, this is awesome. I think I was missing the OPTIONS block. (I am still very new to Org.) Is there any way to remove the ":" from the automatically generated "Footnotes:" header?

[wallyqs]

Not at this moment, this is also based from the original Org mode implementation, though there the test used can be customized to accomodate users of other languages.
https://github.com/wallyqs/org-ruby/blob/master/lib/org-ruby/html_output_buffer.rb#L201
https://github.com/jwiegley/org-mode/blob/master/lisp/ox-html.el#L588

I suppose we could add a special option to be able to change it #+footnotes_title, what do you think?

[nomicode]

Ah, okay. Well, as much as I would like to customise it, if you introduce that change, your implementation diverges from the main one. That seems unwise. A document that displays in one way on Github, say, would display in another way in a different context.

[wallyqs]

Yes, so a bit tricky to be able to modify that default in the context of sites like Github. A setting like this would make more sense to be considered as part of the export options:
https://github.com/wallyqs/org-ruby/blob/master/lib/org-ruby/parser.rb#L303
Then when using it with Jekyll for example, it could be possible to add the export option: to_html(:footnotes_title => "Footnotes").

[maxnikulin]

There is already some footnotes support in the parser, can you give some feedback on which parts of footnotes support needs improvement?

• Text of inline footnotes is duplicated outside of definitions

  ** Heading
  Paragraph[fn:1: An inline footnote]
  

  https://gist.github.com/maxnikulin/9aee674785dc909649be232ca834cd4e#file-issue-footnotes-org
• Definitions of inline footnotes are added to each following section.

  ** Heading
  Paragraph.[fn:1: An inline footnote]
  ** Another heading
  Another paragraph.
  

• The existing "Footnotes" heading is not used as the place where all definitions should appear.
• Label names are not replaced by numbers.

  Text[fn:name]
  

• Multiple references to the same footnote[fn:name] have the same <a name="..."> attribute.

  ** Heading
  Paragraph.[fn:1]
  
  Another paragraph.[fn:1]
  
  ** Footnotes
  [fn:1] An inline footnote
  

• Anonymous footnotes are not supported

  Text.[fn:: Anonymous footnote]
  

• Footnotes references and definitions are not skipped when export of footnotes is disabled

  #+options: f:nil
  

  Instead they are exported literally.
• Footnotes are not enabled by default and unlike in Emacs Org mode requires explicit

  #+options: f:t