Feature Request: Custom auto-import order

[Nugine]

My favour is the following order, sorted by priority.

1. Sub module
2. Super module
3. Current crate
4. Workspace crates
5. std/alloc/core items
6. External crates

However, the current auto-import feature enforces a built-in order which I cannot adjust.
https://rust-analyzer.github.io/manual.html#auto-import

It would be better if I don't have to reorder imports manually.

[Veykril]

The order is currently strictly defined via

rust-analyzer/crates/ide-db/src/imports/insert_use.rs

Lines 219 to 227 in f1b257f

	#[derive(Eq, PartialEq, PartialOrd, Ord)]
	enum ImportGroup {
	// the order here defines the order of new group inserts
	Std,
	ExternCrate,
	ThisCrate,
	ThisModule,
	SuperModule,
	}

The main question is how to expose ordering in a config in a decent way

[Nugine]

The config may look like this typescript definition

type ImportGroup = "std" | "extern-crate" | "this-crate" | "this-module" | "super-module" | "workspace-crate";

type ImportOrder = ImportGroup[]; // unique elements

const A: ImportOrder = [
    "std",
    "extern-crate",
    "workspace-crate",
    "this-crate",
    "this-module",
    "super-module"
];

const B: ImportOrder = [
    "this-module",
    "super-module",
    "this-crate",
    "workspace-crate",
    "std",
    "extern-crate"
];

[Nugine]

I also want a fmt tool which can enforce custom import orders. While rustfmt has an unstable option, it still has a number of issues. I would be appreciated if anyone can help with this problem.

[cmfcmf]

The config may look like this typescript definition

type ImportGroup = "std" | "extern-crate" | "this-crate" | "this-module" | "super-module" | "workspace-crate";

type ImportOrder = ImportGroup[]; // unique elements

const A: ImportOrder = [
    "std",
    "extern-crate",
    "workspace-crate",
    "this-crate",
    "this-module",
    "super-module"
];

const B: ImportOrder = [
    "this-module",
    "super-module",
    "this-crate",
    "workspace-crate",
    "std",
    "extern-crate"
];

I think what's missing from this is the ability to merge some of them together into a single block. E.g., I would like to combine "std" | "extern-crate" into a single block without a new line in between.