How can I have different line-numbers format for unified/side-by-side

[bew]

Hello,

I usually use the unified layout but sometimes want to enable the side-by-side layout.

The way I enable the SBS layout is with git aliases like git -c delta.side-by-side=true diff ....

Currently I have: (reduced to minimal)

[delta]
  features = decorations
[delta "decorations"]
  line-numbers-left-format = {nm:^5}|
  line-numbers-right-format = {np:^5}│

which is perfect for the unified layout, but not so great for SBS (I'd like │{nm:^5}│ & │{np:^5}│)

Is it possible to have different line-numbers-*-format configs for when the SBS layout is active?

[dandavison]

Hi @bew, yes the way to achieve these sorts of conditional customizations is to use delta's "features" feature. Here's an example:

[delta]
    features = my-line-numbers

[delta "my-line-numbers"]
    line-numbers = true
    line-numbers-left-format = {nm:^5}|
    line-numbers-right-format = {np:^5}│

[delta "my-side-by-side"]
    side-by-side = true
    line-numbers-left-format = │{nm:^5}│
    line-numbers-right-format = │{np:^5}│

Now, by default we have line numbers:

and we can activate side-by-side as you demonstrated: git -c delta.features=my-side-by-side ...

As you can imagine, specifying the precise behavior when you start adding multiple features (features = feature-1 feature-2), or when features themselves start defining features, or when you name a custom feature the same as a built-in feature (e.g. "line-numbers", "side-by-side"), gets a bit involved. But the hope is that it's easy enough to find something which does what you want, and some may find it fun to experiment.

[bew]

Working perfectly, thanks a lot!!!
delta is a beast and the people around are awesome ✨