Jeff King <p...@peff.net> writes:

> Something like the patch below might work, but I didn't test it very
> thoroughly (and note the comments, which might need dealing with). Maybe
> it would make a sensible base for Harry to build on if he wants to
> pursue this.
>
> With it, you can do:
>
>   git log --format='%h %s%if(%d,%n  Decoration:%d)' origin
> ...
> You could also make "%d" more flexible with it. We unconditionally
> include the " (...)" wrapper when expanding it. But assuming we
> introduced a "%D" that is _just_ the decoration names, you could do:
>
>   %if(%D, (%D))
>
> to get the same effect with much more flexibility.

Yup.

I do not think we need to go overboard to support nesting and stuff,
let alone turing completeness ;-), especially when we are going to
test the condition part only for emptyness.  Even with this simple
patch, I sense that we are near a slipperly slope of wanting to add
%unless(%d, ) or %ifelse(%d,%d, \(undefined\)), so I am not 100%
convinced yet.

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