Describe the bug
Only the four fluids register with only best (base) JEI installed. Items (guide book, crafter, paintbrush, chests, etc.), do not. Coupled with your mod's lack of documentation, this makes using it very difficult.

To Reproduce

Fabric Loader 0.15.11
IM 1.20.1
LWJGL 3 2.2.1

Expected behavior
I expected items/recipes to appear as I progressed through the mod, as described in the curseforge page:

"You may notice that most Items do not have a recipe displayed in tools like REI. Recipes and their matching Guidebook entries are unlocked step by step, giving you something new to toy with with each discovery."

Other mods have no problem registering recipes in a generic manner, and you don't list JEI (without add-ons) as specifically incompatible. I would expect JEI to work as-is, without bloat/clutter. I would also expect such an unusual incompatibility to be documented.

Minecraft version
1.20.1

Mod version
Tested with each of
spectrum 1.7.11 and spectrum 1.7.13
and both with or without
specutils 1.0.1 and embeddium 0.3.20+mc1.20.1

Other mods have no problem registering recipes in a generic manner, and you don't list JEI (without add-ons) as specifically incompatible. I would expect JEI to work as-is, without bloat/clutter.

It is the other way around, actually! Each mod has to add dedicated compat with JEI for each single recipe type they add. This is nothing that happens automatically or generically.
Currently Spectrum supports REI & EMI as recipe viewers, since pretty much noone uses JEI on fabric. I agree adding support for JEI as recipe viewer would be nice, although this will take quite a bit of time to get done.

The missing items in JEI were caused by a bug in one of the libs, that Spectrum uses. That will be fixed via DaFuqs/Revelationary#20, thanks to @imreallybadatnames. That one will be fixed shortly.

Oh yeah, to note: The version 1.3.8 of revelationary fixes the items not showing up in the item list.
That leaves adding recipe type support for JEI. But that one will be a huge chunk of work (how many people on fabric do even use it?)

I suppose I should address this:

1. How many people use JEI? I can't speak for the fabric community, but it's still popular among long term Minecraft players. I have the impression most of us prefer Forge. REI has some annoying antifeatures and EMI has a weirdly squished GUI, so I generally avoid 'em.

2. Version 1.3.8 of revolutionary fixes the problem. It makes a few more items show up, but there are no recipes and several items were still missing.

3. Supporting JEI is more work. EMI automatically grabs JEI recipes, and REI supports JEI plugins, so you're probably making more work or yourself by avoiding JEI. (Can't say for sure, because I haven't personally written dedicated plugins for these three mods.)

4. Nothing is automatic. Anything processed by vanilla recipes handlers (including crafting table recipes) should be added automatically. And JEI (normally) grabs its searchables directly from the creative tab, the block registry, and the item registry. If things aren't showing up, it's probably because you're doing something to break that automation.

Relevant links:
https://github.com/mezz/JustEnoughItems/wiki/Adding-and-Hiding-Items-%5B1.13-and-Up%5D
https://github.com/mezz/JustEnoughItems/wiki/Creating-Plugins-%5B1.13-and-Up%5D
https://github.com/mezz/JustEnoughItems/wiki/Recipes-Overview-%5B1.13-and-Up%5D
https://github.com/mezz/JustEnoughItems/blob/1.20.1/CommonApi/src/main/java/mezz/jei/api/IModPlugin.java

JEI is not commonly used on Fabric, actually. In fact, of the three big recipe viewer mods, it is the newest to arrive on Fabric, and so support for it is far more limited generally - don't expect it.

Also, as for your third point of "making more work for yourself by avoiding JEI", I think that's just incorrect.

Hi Gronglegrowth,

Spectrum explicitly advertises its support for forge, so the "not on my Fabric" stuff is a weird tact to take. And JEI is the oldest of the three recipe viewers, and generally well liked. I don't recall other Fabric mods having issues with JEI. The amount of hate it's getting here is strange.

Regarding your insight on my third point: Saying someone is "just incorrect" is unlikely to change their mind. If you want to share specific insight demonstrating a reasoned and educated perspective, that's one thing. But why comment just to say you disagree? Have you ever made a JEI plugin? Was it twice as hard as making an REI plugin? What does it require that REI doesn't?

It should be noted that EMI can also load JEI plugins when both EMI and JEI are installed alongside one another, so there's not really much of a point in having dedicated JEI integration when there's already EMI integration.

It was already said before that mods have to explicitly add compat for JEI; one cannot use an existing EMI or REI plugin. That is by definition more work than not implementing JEI support at all - which I feel is acceptable to do in this case, as it is more common for EMI or REI to be used considering it is primarily a Fabric mod. It'd be nice to have it, sure, but not necessary.

I've never touched REI plugins myself, but I have written some EMI support and at least looked at the existing JEI support for another mod I help make. The two are reasonably different, so I assume REI is also. Writing support for EMI definitely seems easier than JEI, to me at least.

@no-name-provided Given the lack of incentive for the majority of developers and players alike, it is unlikely any progress will be made on this front unless you submit a PR for JEI integration in Spectrum yourself. Feel free to do so.

My kena here is being quite nice, so for hir and our community I am going to be the one to quite kindly tell you that you are tripping.

Regardless of any level of automation that there may be for adding recipe types (which. To note. Does not work like that - especially the crafting book thing. You do understand that most mods do not touch that and that the "automatic integration" is just JEI already knowing how to parse vanilla recipe types right?). It is the case that Spectrum's needs and conditions are more complicated than that.
By virtue of being a mod about discovery, colors, being queer, and another thing I can't quite remember, the unlock system hides anything you have yet to run into in progression; recipes are something that is hidden and that mechanic is core to the mod. This mechanic, as anyone with more than three neurons should be able to educatedly guess, is not something that recipe viewers automatically support, and requires specific compat.

Compat that, of course, takes time to develop and time to maintain. In the best case scenario that is going to be a lot of work going into one recipe viewer that is only used by a sparse minority of our player base. In the worst case, JEI straight up does not have the internal capabilities to support recipe concealment and we need to go and speak with the dev and do PRs and the whole ordeal just to start.

From all that it should be quite plainly evident why it is not worth it for us to work on JEI. That coupled with a lack of interest to do so means that it is not happening.

If you want it I encourage you to go on ahead and code it yourself. But being entirely honest you seem to me like the type of person to go to a cafe with your own drink and then complain to the barista that it is too bitter. Nobody is stopping you from fixing your own problems, or making addons or integration patches, none save for your obnoxious self.

I don't really care about JEI but if anyone want to add jei support there are some ways to hide recipes. Here are some examples present in both forge and fabric branch of the mod Malum

https://github.com/SammySemicolon/Malum-Mod/blob/157534dce57eddf18d6f863c079461c8968fd58f/src/main/java/com/sammy/malum/compability/jei/JEIHandler.java#L149

https://github.com/SammySemicolon/Malum-Mod/blob/1.6-1.20.1/src/main/java/com/sammy/malum/compability/jei/HiddenRecipeSet.java

Thanks for clarifying, Gronglegrowth. I agree that there would be some transitioning overhead; it just seemed like maybe Dafuqs was overestimating the difficulty (and underestimating the convenience) of an all-in-one plugin. That, and I really think you're underestimating it's popularity. I agree that it may make more sense delay to looking into transitioning after EMI or REI introduce a breaking change, and the plugin needs to be revised anyway. And yes, I don't know if revelation is compatible with JEI, or the JEI functionality for hiding items (which I linked) is sufficient for Spectrum. Thank you for interpreting my report, suggestions, and questions in the friendly, cooperative spirit in which they were intended.

unilock: I was beginning to get that impression. Since I've been burned by Spectrum already, and and the lack of documentation makes identifying bugs painful, I'm probably just going to drop the mod (I kinda already did when the update to revelationary didn't fix the bugs). I only make addons/datapacks for mods I've already played, and found enjoyable.

Azzyypaaras: You have been reported for bullying/harassment. You seem to have misunderstood the points I was making and/or asking about. You have revealed a significant gap in your understanding of the mods being discussed. You inserted random, irrelevant information. And you made unfair, negative assumptions. We clearly can't have a polite interaction, so I'll ask you to stop interacting with me.

Dafuqs: If you have no current plans to add JEI compatibility, and you're happy with items that show up in the EMI search not showing up in the JEI search, then you may want to close this ticket. I will be unsubscribing shortly.

Obligatory disclaimer: suggestions aren't demands. Dafuqs doesn't need to justify supporting/not supporting mods. When they do choose to discuss their reasons, additional comments are intended to be informative (for either of us), not argumentative.