proposal: x/tools/cmd/goimports: support multiple groups for imported packages via -local

[uynap]

Hi,

I would like to automatically group the imported packages into 4 groups.

// standard packages

// third party packages

// company private packages

// current code base

It can't be done by the current goimports, because the -local for the goimports only gets a string.
For example, I have a go source file below:

package Foo

import (
    "fmt"
    "github.com/google/uuid"
    "github.com/company/private/database"
    "github.com/current/codebase/pkg/utils"
)

By using goimports -local github.com/current foo.go, I will have:

package Foo

import (
    "fmt"

    "github.com/google/uuid"
    "github.com/company/private/database"

    "github.com/current/codebase/pkg/utils"
)

I want goimports can support the arguments like: goimports -local github.com/current -local github.com/company foo.go.
The expectation is as below.

package Foo

import (
    "fmt"

    "github.com/google/uuid"

    "github.com/company/private/database"

    "github.com/current/codebase/pkg/utils"
)

My requested feature is NOT a breaking change, it's back compatible.
I think it should be a simple change. If you are ok for the feature, I will provide the implementation with testing.

TIA.

[ianlancetaylor]

CC @bradfitz

[violin0622]

There's already an implementation which may help:
https://github.com/daixiang0/gci?ref=javorszky.co.uk

I'm looking forward goimports to support company group too.