corfu VS orderless

You could try corfu. It has auto-completion disabled by default and works most places with M-Tab. Or you could set a longish corfu-auto-delay (0.75s say), and let auto popup only when you stop to ponder a while.

Corfu supports this. Or at least it allows you to move completions to the mini buffer which I find quiet useful.

A substantial section of the community is using corfu instead of company, but I wouldn't say company is out of date by any means. In emacs 29 eglot will be a built in, which might act as a replacement for lsp-mode depending on what functionality you need.

Wow, interesting that my response is getting down voted. It seems not enough that I give away my work for free. Nevertheless I appreciate support from the community, as other Emacs package developers. The support is actually helpful. To clarify, publishing my configuration would translate into quite a bit of work, requiring separation of private and public bits.

I am currently using evil and corfu, but I want to configure such that pressing a single escape will invoke corfu-quit when its UI is active (because pressing "C-g" is harder).

A few days ago I found an unexplained slowness when using Corfu on Emacs 29 with pgtk. I stripped my configuration to basically just Corfu, and still had a noticeable delay. Maybe it is related to your problem. https://github.com/minad/corfu/issues/307

The most straight forward solution is probably the package company-math. (that's what I use but with corfu and cape)

See here: https://github.com/minad/corfu/issues/231

orderless. A highly configurable completion style that matches multiple patterns in any order against minibuffer completion candidates.

An example relevant to your list would be some changes many people are taking with their completion framework - using package that leverage core emacs functionality rather than replacing it with a complete package that 'overrides' it. Consult, vertico, orderless and associate packages come to mind here. If you do a bit of a search you'll find plenty of info. Here is a video from Prot on the subject, but there are many others as well. I think Prot actually went on to write his own completion system to overlay native emacs functionality as well.

You didn't mention, so I'll ask, are you using the orderless (https://github.com/oantolin/orderless) completion style?

Fuzzy completion ala Orderless would be awesome: hitting space during completion acts as a pattern separator.

I dunno—I like how Vertico+Counsel feel. I'm not sure how good the support for Orderless and Embark are in Ivy, but I really like how those packages compose so nicely with the Vertico+Consult ecosystem.

In general, you want either orderless or prescient, with my personal preference being the former.

You probably want to investigate completion styles. There are many builtin styles, from basic, which just does prefix completion, on up. But there are also 3rd party styles. One of the most powerful is called orderless. Considering all these styles, there really is a ton of flexibility in how you can get to a completion candidate like some-named-something (some, s-n-s, sns, soso, [a-z]{4}-na, e\b \bs, ...). You can even configure more than one style at a time (and usually do).

Well, I've written some general purpose Emacs packages (orderless and embark) that I use a lot, but I also write Emacs Lisp for one-off tasks.

I like it. Would be nice to see orderless-style (https://github.com/oantolin/orderless) completion, and a config not to enter the directory by narrowing the completion to one, requiring enter to be pressed.