This looks pretty cool, but why do you need to "run" delta rather than having it dump out the static HTML? I'd love to use this as server-less review: "Oh, I've got this local diff on my box, here look at this HTML for a prettified view".
Good idea! There's already a way to print out html to the command line, but it should really be the same as what gets rendered in the browser. I've added a Github issue to track. this.
Nice but the diff's fail contrast levels for accessibility.
I have trouble with contrast and I can barely read the diffs and certainly wouldn't use it for any serious amount of time.
Do you have examples of a color scheme which would work better, or other suggestions on how we could improve it? I'm thinking the ability to customize color schemes would be a useful feature to add.
Not really actually, I was going to recommend Solarized[1] and base16[2] but both fail to pass AAA according to WAVE[3]. I'd recommend installing the WAVE extension for Chrome or Firefox as a start point.