Randomly pick shader on startup

[PeterCardenas]

I have a couple shaders that I like, and I would like to automatically switch between them so that I can enjoy these shaders. This might fit under something that would be available in the to-be ghostty remote API or some desktop automation, but I would much prefer to have this in ghostty core. Admittedly, this is purely cosmetic and low priority, but would definitely delight my terminal experience even more.

My proposal would be add another config custom-shader-behavior and have two different values, a default value of stacked (which is the current behavior), and another value of randomize. There are definitely extensions of having a combination of stacked and randomize, and when should it randomize (on shell startup, on an interval, on new tab), but for now, just randomizing at shell startup would be nice for me. I'm looking into how to contribute this myself (though my zig experience is 0 😅 ), but if a maintainer/other contributor were to take interest in implementing this I would greatly appreciate it 🙏

[rhodes-b]

Id say this should not be in the ghostty core it would come with #2353 and something with your shell picking a random one

[00-kat]

Typically things this niche do indeed get moved to #2353 instead.

[PeterCardenas]

makes sense, though I already have the change and am willing to clean it up

[PeterCardenas]

Have this branch with this changed hacked out and works pretty well: main...PeterCardenas:ghostty:randomize-shader-on-startup