[Feature] Line highlight

[franciscolourenco]

You can already specify a line to jump to automatically.

This issue is for the implementation of the highlighting of that line, like github does.

Thanks

[rupa]

we use the pygments library for highlighting - if it supports that I'd be open to it, especially in a pull request.

[mtahmed]

pygments does support it but the browsers don't actually send the anchor part (the part after '#') to the HTTP server. So in other words, it's possible with either query_string (or some JS hackery to send the anchor to the server, although I don't like this option at all).

So there are two options:

• Allow passing the line highlight list through the query_string.
• Close this issue with 'wont fix'.

[Oblomov]

This should be possible by replacing the lineanchors=n option to the HtmlFormatter with linespans=n and adding a rule such as :target { background-color: yellow } (or whatever) to the CSS. The :target selector might not work in IE < 9, but aside from that it's almost universally supported.

[mtahmed]

Ooooh! Didn't think of that! Clever solution. Question: Where would we add the :target CSS then?

[Oblomov]

Hm there doesn't seem to be a trivial way to customize the CSS styles generated by Pygments. I can't think of a trivial way of doing this 8-/

[mtahmed]

Maybe instead of generating CSS every time, just use pre-compiled CSS file and use the cssfile and noclobber_cssfile arguments to the formatter and add the desired :target ... line to the CSS file.