Add "grouper" linter

grouper — a Go linter to analyze expression groups
https://github.com/leonklingele/grouper

.golangci.example.yml

@@ -516,6 +516,20 @@ linters-settings:
       - shadow
     disable-all: false
 
+  grouper:
+    # const
+    const-require-single-const: false
+    const-require-grouping: false
+    # import
+    import-require-single-import: false
+    import-require-grouping: false
+    # type
+    type-require-single-type: false
+    type-require-grouping: false
+    # var
+    var-require-single-var: false
+    var-require-grouping: false
+
   depguard:
     list-type: denylist
     include-go-root: false

go.mod

@@ -50,6 +50,7 @@ require (
 	github.com/kyoh86/exportloopref v0.1.8
 	github.com/ldez/gomoddirectives v0.2.2
 	github.com/ldez/tagliatelle v0.3.0
+	github.com/leonklingele/grouper v1.1.0
 	github.com/maratori/testpackage v1.0.1
 	github.com/matoous/godox v0.0.0-20210227103229-6504466cf951 // v1.0
 	github.com/mattn/go-colorable v0.1.12

pkg/config/linters_settings.go

@@ -127,6 +127,7 @@ type LintersSettings struct {
 	Gosec            GoSecSettings
 	Gosimple         StaticCheckSettings
 	Govet            GovetSettings
+	Grouper          GrouperSettings
 	Ifshort          IfshortSettings
 	ImportAs         ImportAsSettings
 	Ireturn          IreturnSettings
@@ -368,6 +369,21 @@ func (cfg GovetSettings) Validate() error {
 	return nil
 }
 
+type GrouperSettings struct {
+	// const
+	ConstRequireSingleConst bool `mapstructure:"const-require-single-const"`
+	ConstRequireGrouping    bool `mapstructure:"const-require-grouping"`
+	// import
+	ImportRequireSingleImport bool `mapstructure:"import-require-single-import"`
+	ImportRequireGrouping     bool `mapstructure:"import-require-grouping"`
+	// type
+	TypeRequireSingleType bool `mapstructure:"type-require-single-type"`
+	TypeRequireGrouping   bool `mapstructure:"type-require-grouping"`
+	// var
+	VarRequireSingleVar bool `mapstructure:"var-require-single-var"`
+	VarRequireGrouping  bool `mapstructure:"var-require-grouping"`
+}
+
 type IfshortSettings struct {
 	MaxDeclLines int `mapstructure:"max-decl-lines"`
 	MaxDeclChars int `mapstructure:"max-decl-chars"`

pkg/golinters/grouper.go

@@ -0,0 +1,37 @@
+package golinters
+
+import (
+	"golang.org/x/tools/go/analysis"
+
+	"github.com/golangci/golangci-lint/pkg/config"
+	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
+
+	grouper "github.com/leonklingele/grouper/pkg/analyzer"
+)
+
+func NewGrouper(settings *config.GrouperSettings) *goanalysis.Linter {
+	linterCfg := map[string]map[string]interface{}{}
+	if settings != nil {
+		linterCfg["grouper"] = map[string]interface{}{
+			// const
+			"const-require-single-const": settings.ConstRequireSingleConst,
+			"const-require-grouping":     settings.ConstRequireGrouping,
+			// import
+			"import-require-single-import": settings.ImportRequireSingleImport,
+			"import-require-grouping":      settings.ImportRequireGrouping,
+			// type
+			"type-require-single-type": settings.TypeRequireSingleType,
+			"type-require-grouping":    settings.TypeRequireGrouping,
+			// var
+			"var-require-single-var": settings.VarRequireSingleVar,
+			"var-require-grouping":   settings.VarRequireGrouping,
+		}
+	}
+
+	return goanalysis.NewLinter(
+		"grouper",
+		"An analyzer to analyze expression groups.",
+		[]*analysis.Analyzer{grouper.New()},
+		linterCfg,
+	).WithLoadMode(goanalysis.LoadModeSyntax)
+}

pkg/lint/lintersdb/manager.go

@@ -111,6 +111,7 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 	var gosecCfg *config.GoSecSettings
 	var gosimpleCfg *config.StaticCheckSettings
 	var govetCfg *config.GovetSettings
+	var grouperCfg *config.GrouperSettings
 	var ifshortCfg *config.IfshortSettings
 	var importAsCfg *config.ImportAsSettings
 	var ireturnCfg *config.IreturnSettings
@@ -141,6 +142,7 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 		gosecCfg = &m.cfg.LintersSettings.Gosec
 		gosimpleCfg = &m.cfg.LintersSettings.Gosimple
 		govetCfg = &m.cfg.LintersSettings.Govet
+		grouperCfg = &m.cfg.LintersSettings.Grouper
 		ifshortCfg = &m.cfg.LintersSettings.Ifshort
 		importAsCfg = &m.cfg.LintersSettings.ImportAs
 		ireturnCfg = &m.cfg.LintersSettings.Ireturn
@@ -408,6 +410,11 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 			WithAlternativeNames("vet", "vetshadow").
 			WithURL("https://golang.org/cmd/vet/"),
 
+		linter.NewConfig(golinters.NewGrouper(grouperCfg)).
+			WithSince("v1.44.0").
+			WithPresets(linter.PresetStyle).
+			WithURL("https://github.com/leonklingele/grouper"),
+
 		linter.NewConfig(golinters.NewIfshort(ifshortCfg)).
 			WithSince("v1.36.0").
 			WithPresets(linter.PresetStyle).