How can I change a theme to set a background color to the current line in TextMate 2?

Question

In TextMate 1, we could use the Preferences dialog for this. In TextMate 2, at least at this point, I gather we have to use Edit Bundles, and edit the source of a specific theme. But what is the syntax to set a background color to the current line (i.e. the line on which the cursor is)?

Answer 1

Open up the bundle editor and then go to Theme's (or whatever theme you might have picked under View > Theme (Solarized and SubtleGradient have their own bundle).

then it is a simple JSON document for editing your theme.

Edit the "lineHighlight" property and set it to whatever you want your highlighted line to be in HEX.