x/tools/gopls: implement code action to split and group args/elements/return values into single/separate lines

[fatanugraha]

gopls version

v0.14.2

go env

GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/Users/fatanugraha/Library/Caches/go-build'
GOENV='/Users/fatanugraha/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/fatanugraha/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='darwin'
GOPATH='/Users/fatanugraha/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/opt/homebrew/Cellar/go/1.21.6/libexec'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/opt/homebrew/Cellar/go/1.21.6/libexec/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.21.6'
GCCGO='gccgo'
AR='ar'
CC='cc'
CXX='c++'
CGO_ENABLED='1'
GOMOD='/dev/null'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/xw/9_n8jx3101g27v376tld9qbw0000gn/T/go-build3470959707=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

Implement a code action to easily refactor function arguments, return values, and composite literal elements into separate lines or a single line.

This feature would be particularly helpful when working on large business-related features that often require long variable names. The ability to quickly split or group lines would significantly accelerate refactoring efforts to ensure code adheres to specified character limits.

for example:

// original code
func A(a int, b int, c int) (d int, e int) {
   ...
}

[]int{1,2,3}

// put args to separate lines
func A(
    a int, 
    b int, 
    c int,
) (d int, e int) {
   ...
}

// put return values to separate lines
func A(a int, b int, c int) (
    d int, 
    e int,
) {
   ...
}

// put composite literal elements to a separate lines
[]int{
    1,
    2, 
    3,
}

What did you see happen?

The feature is not available yet on gopls.

What did you expect to see?

To see the feature in gopls.

Editor and settings

VSCode

Logs

N/A

[gopherbot]

Change https://go.dev/cl/558475 mentions this issue: gopls: implement code action to split/group lines