ID's are not generated on header elements

[Phamiliarize]

I noticed a peculiarity in that headers are not generated on H elements.

# My Title should evaluate to <h1 id="my-title">My Title</h1>

Instead it evaluates to <h1>My Title</h1>.

This makes internal links not possible, which is a rather large issue since MD is often used for documentation.

[Phamiliarize]

https://github.com/jch/html-pipeline/blob/master/lib/html/pipeline/toc_filter.rb

Here is a ruby example of the implementation I believe.

 text = node.text
          id = ascii_downcase(text)
          id.gsub!(PUNCTUATION_REGEXP, '') # remove punctuation
          id.tr!(' ', '-') # replace spaces with dash

          uniq = headers[id] > 0 ? "-#{headers[id]}" : ''
          headers[id] += 1
          if header_content = node.children.first
            result[:toc] << %(<li><a href="##{id}#{uniq}">#{EscapeUtils.escape_html(text)}</a></li>\n)
            header_content.add_previous_sibling(%(<a id="#{id}#{uniq}" class="anchor" href="##{id}#{uniq}" aria-hidden="true">#{anchor_icon}</a>))
          end

[RichardDale]

For a real-world example of this issue, see:
https://pypi.org/project/norgatedata/

[andrewtavis]

Explicitly adding HTML links with ids after headers is one way of working around all this. The following creates a fully linked readme that will also work on other platforms (such as PyPI for the above comment):

Contents:<a id="contents"></a> [Section Header](#section-header)

# Section Header [`↩`](#contents) <a id="section-header"></a>

See any of my projects for an example of how it functions.

[xplosionmind]

Generating header IDs is a crucial feature, in my opinion. Doing how @andrewtavis suggested is feasible as a temporary solution to adopt only when it is fundamental to have a reference to the header; nevertheless, writing that much markup only to get what can easily be automated seems very cumbersome and useless.