x/tools/gopls: add analyzer to report when code isn't gofmt'd properly #77910
Description
gopls version
Build info
----------
golang.org/x/tools/gopls v0.21.1
golang.org/x/tools/gopls@v0.21.1 h1:1/o9z5Brdero4jFm9Jr46Uwj8GU9lQdoSXHMlwRHb/w=
github.com/BurntSushi/toml@v1.5.0 h1:W5quZX/G/csjUnuI8SUYlsHs9M38FC7znL0lIO+DvMg=
github.com/fatih/camelcase@v1.0.0 h1:hxNvNX/xYBp0ovncs8WyWZrOrpBNub/JfaMvbURyft8=
github.com/fatih/gomodifytags@v1.17.1-0.20250423142747-f3939df9aa3c h1:dDSgAjoOMp8da3egfz0t2S+t8RGOpEmEXZubcGuc0Bg=
github.com/fatih/structtag@v1.2.0 h1:/OdNE99OxoI/PqaW/SuSK9uxxT3f/tcSZgon/ssNSx4=
github.com/fsnotify/fsnotify@v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
github.com/google/go-cmp@v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/jsonschema-go@v0.3.0 h1:6AH2TxVNtk3IlvkkhjrtbUc4S8AvO0Xii0DxIygDg+Q=
github.com/modelcontextprotocol/go-sdk@v0.8.0 h1:jdsBtGzBLY287WKSIjYovOXAqtJkP+HtFQFKrZd4a6c=
github.com/yosida95/uritemplate/v3@v3.0.2 h1:Ed3Oyj9yrmi9087+NczuL5BwkIc4wvTb5zIM+UJPGz4=
golang.org/x/exp/typeparams@v0.0.0-20251023183803-a4bb9ffd2546 h1:HDjDiATsGqvuqvkDvgJjD1IgPrVekcSXVVE21JwvzGE=
golang.org/x/mod@v0.30.0 h1:fDEXFVZ/fmCKProc/yAXXUijritrDzahmwwefnjoPFk=
golang.org/x/sync@v0.18.0 h1:kr88TuHDroi+UVf+0hZnirlk8o8T+4MrK6mr60WkH/I=
golang.org/x/sys@v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc=
golang.org/x/telemetry@v0.0.0-20251111182119-bc8e575c7b54 h1:E2/AqCUMZGgd73TQkxUMcMla25GB9i/5HOdLr+uH7Vo=
golang.org/x/text@v0.31.0 h1:aC8ghyu4JhP8VojJ2lEHBnochRno1sgL6nEi9WGFGMM=
golang.org/x/tools@v0.39.1-0.20260109155911-b69ac100ecb7 h1:UaaZx92hw3fDa9xRcX2//NBRE3sR4VHQLlt0TkN2geY=
golang.org/x/vuln@v1.1.4 h1:Ju8QsuyhX3Hk8ma3CesTbO8vfJD9EvUBgHvkxHBzj0I=
honnef.co/go/tools@v0.7.0-0.dev.0.20251022135355-8273271481d0 h1:5SXjd4ET5dYijLaf0O3aOenC0Z4ZafIWSpjUzsQaNho=
mvdan.cc/gofumpt@v0.8.0 h1:nZUCeC2ViFaerTcYKstMmfysj6uhQrA2vJe+2vwGU6k=
mvdan.cc/xurls/v2@v2.6.0 h1:3NTZpeTxYVWNSokW3MKeyVkz/j7uYXYiMtXRUfmjbgI=
go: go1.26.0
go env
AR='ar'
CC='cc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='c++'
GCCGO='gccgo'
GO111MODULE=''
GOARCH='arm64'
GOARM64='v8.0'
GOAUTH='netrc'
GOBIN=''
GOCACHE='~/Library/Caches/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='~/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/77/nbm3y7497x79xlkg66vny9gm0000gn/T/go-build1241243535=/tmp/go-build -gno-record-gcc-switches -fno-common'
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/opt/gopath/pkg/mod'
GOOS='darwin'
GOPATH='/opt/gopath'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/opt/homebrew/Cellar/go/1.26.0/libexec'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='~/Library/Application Support/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/opt/homebrew/Cellar/go/1.26.0/libexec/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'What did you do?
Using gopls as an lsp, while modifying code and didn't format the whitespacing correctly
What did you see happen?
gopls has code actions for doing imports/format checks, but when running a gopls diagnostic check, it doesn't actually report that there are formatting issues.
What did you expect to see?
While many interactive IDEs when working with an LSP will issue "format on save" type commands, if you're using the LSP in a read-only mode you won't get any info or hint level messages suggesting that your formatting is off. I'm wondering if the golang team would be open to adding an optional analyzer to report when the file isn't gofmt'd.
Editor and settings
No response
Logs
No response