feat: code line number (close: #365)

[ulivz]

cc @egoist , it also fixed a empty line highlight issue:

`<span class="highlighted-line">${split || '\n'}</span>`

Snapshot

Highlight line + Line number

Only line number

Only Highlight line

[ycmjason]

I think it would be nicer to make this a separate markdown-it plugin. Semantically it is not right to put this feature in highlightLines plugin.

P.S. I am working on the same thing too but haven't yet complete it.

[ycmjason]

Also, the current implementation make the line number selectable? Which might not be ideal?

[ulivz]

1. make this a separate markdown-it plugin

Sure, I originally want to make it as a separate plugin, but since markdown-it-highlight-lines rewrite the fence method, so it won't work. but you can try.

2. it is not right to put this feature in highlightLines plugin.

Agree, but the better choice is to rename this plugin to linePlugin

3. the current implementation make the line number selectable

Have handled for that.

[xkcoding]

@ulivz Unbelievable. That's what I want.

[ulivz]

Updated May 13th

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