feat: apply formatters after the suggested fixes (#5246)

go.mod

@@ -45,7 +45,7 @@ require (
 	github.com/gofrs/flock v0.12.1
 	github.com/golangci/dupl v0.0.0-20180902072040-3e9179ac440a
 	github.com/golangci/go-printf-func-name v0.1.0
-	github.com/golangci/gofmt v0.0.0-20240816233607-d8596aa466a9
+	github.com/golangci/gofmt v0.0.0-20241223200906-057b0627d9b9
 	github.com/golangci/misspell v0.6.0
 	github.com/golangci/plugin-module-register v0.1.1
 	github.com/golangci/revgrep v0.5.3

pkg/config/config.go

@@ -93,32 +93,15 @@ func detectGoVersion() string {
 // else it returns `go` version if present,
 // else it returns empty.
 func detectGoVersionFromGoMod() string {
-	info, err := gomod.GetModuleInfo()
-	if err != nil {
-		return ""
-	}
-
-	wd, err := os.Getwd()
+	modPath, err := gomod.GetGoModPath()
 	if err != nil {
-		return ""
-	}
-
-	slices.SortFunc(info, func(a, b gomod.ModInfo) int {
-		return cmp.Compare(len(b.Path), len(a.Path))
-	})
-
-	goMod := info[0]
-	for _, m := range info {
-		if !strings.HasPrefix(wd, m.Dir) {
-			continue
+		modPath = detectGoModFallback()
+		if modPath == "" {
+			return ""
 		}
-
-		goMod = m
-
-		break
 	}
 
-	file, err := parseGoMod(goMod.GoMod)
+	file, err := parseGoMod(modPath)
 	if err != nil {
 		return ""
 	}
@@ -144,3 +127,32 @@ func parseGoMod(goMod string) (*modfile.File, error) {
 
 	return modfile.Parse("go.mod", raw, nil)
 }
+
+func detectGoModFallback() string {
+	info, err := gomod.GetModuleInfo()
+	if err != nil {
+		return ""
+	}
+
+	wd, err := os.Getwd()
+	if err != nil {
+		return ""
+	}
+
+	slices.SortFunc(info, func(a, b gomod.ModInfo) int {
+		return cmp.Compare(len(b.Path), len(a.Path))
+	})
+
+	goMod := info[0]
+	for _, m := range info {
+		if !strings.HasPrefix(wd, m.Dir) {
+			continue
+		}
+
+		goMod = m
+
+		break
+	}
+
+	return goMod.GoMod
+}

pkg/goformatters/formatters.go

@@ -0,0 +1,6 @@
+package goformatters
+
+type Formatter interface {
+	Name() string
+	Format(filename string, src []byte) ([]byte, error)
+}

pkg/goformatters/gci/gci.go

@@ -0,0 +1,48 @@
+package gci
+
+import (
+	gcicfg "github.com/daixiang0/gci/pkg/config"
+	"github.com/daixiang0/gci/pkg/gci"
+	"github.com/ldez/grignotin/gomod"
+
+	"github.com/golangci/golangci-lint/pkg/config"
+)
+
+const Name = "gci"
+
+type Formatter struct {
+	config *gcicfg.Config
+}
+
+func New(cfg config.GciSettings) (*Formatter, error) {
+	modPath, err := gomod.GetModulePath()
+	if err != nil {
+		return nil, err
+	}
+
+	parsedCfg, err := gcicfg.YamlConfig{
+		Cfg: gcicfg.BoolConfig{
+			NoInlineComments: cfg.NoInlineComments,
+			NoPrefixComments: cfg.NoPrefixComments,
+			SkipGenerated:    cfg.SkipGenerated,
+			CustomOrder:      cfg.CustomOrder,
+			NoLexOrder:       cfg.NoLexOrder,
+		},
+		SectionStrings: cfg.Sections,
+		ModPath:        modPath,
+	}.Parse()
+	if err != nil {
+		return nil, err
+	}
+
+	return &Formatter{config: parsedCfg}, nil
+}
+
+func (*Formatter) Name() string {
+	return Name
+}
+
+func (f *Formatter) Format(filename string, src []byte) ([]byte, error) {
+	_, formatted, err := gci.LoadFormat(src, filename, *f.config)
+	return formatted, err
+}

pkg/goformatters/gofmt/gofmt.go

@@ -0,0 +1,35 @@
+package gofmt
+
+import (
+	"github.com/golangci/gofmt/gofmt"
+
+	"github.com/golangci/golangci-lint/pkg/config"
+)
+
+const Name = "gofmt"
+
+type Formatter struct {
+	options gofmt.Options
+}
+
+func New(cfg config.GoFmtSettings) *Formatter {
+	var rewriteRules []gofmt.RewriteRule
+	for _, rule := range cfg.RewriteRules {
+		rewriteRules = append(rewriteRules, gofmt.RewriteRule(rule))
+	}
+
+	return &Formatter{
+		options: gofmt.Options{
+			NeedSimplify: cfg.Simplify,
+			RewriteRules: rewriteRules,
+		},
+	}
+}
+
+func (*Formatter) Name() string {
+	return Name
+}
+
+func (f *Formatter) Format(filename string, src []byte) ([]byte, error) {
+	return gofmt.Source(filename, src, f.options)
+}

pkg/goformatters/gofumpt/gofumpt.go

@@ -0,0 +1,43 @@
+package gofumpt
+
+import (
+	"strings"
+
+	gofumpt "mvdan.cc/gofumpt/format"
+
+	"github.com/golangci/golangci-lint/pkg/config"
+)
+
+const Name = "gofumpt"
+
+type Formatter struct {
+	options gofumpt.Options
+}
+
+func New(cfg config.GofumptSettings, goVersion string) *Formatter {
+	return &Formatter{
+		options: gofumpt.Options{
+			LangVersion: getLangVersion(goVersion),
+			ModulePath:  cfg.ModulePath,
+			ExtraRules:  cfg.ExtraRules,
+		},
+	}
+}
+
+func (*Formatter) Name() string {
+	return Name
+}
+
+func (f *Formatter) Format(_ string, src []byte) ([]byte, error) {
+	return gofumpt.Source(src, f.options)
+}
+
+// modified copy of pkg/golinters/gofumpt/gofumpt.go
+func getLangVersion(v string) string {
+	if v == "" {
+		// TODO: defaults to "1.15", in the future (v2) must be removed.
+		return "go1.15"
+	}
+
+	return "go" + strings.TrimPrefix(v, "go")
+}

pkg/goformatters/goimports/goimports.go

@@ -0,0 +1,22 @@
+package goimports
+
+import (
+	"golang.org/x/tools/imports"
+)
+
+const Name = "goimports"
+
+type Formatter struct{}
+
+func New() *Formatter {
+	return &Formatter{}
+}
+
+func (*Formatter) Name() string {
+	return Name
+}
+
+func (*Formatter) Format(filename string, src []byte) ([]byte, error) {
+	// The `imports.LocalPrefix` (`settings.LocalPrefixes`) is a global var.
+	return imports.Process(filename, src, nil)
+}

pkg/lint/runner.go

@@ -60,6 +60,11 @@ func NewRunner(log logutils.Log, cfg *config.Config, args []string, goenv *gouti
 		return nil, fmt.Errorf("failed to get enabled linters: %w", err)
 	}
 
+	formatter, err := processors.NewFormatter(log, cfg, enabledLinters)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create formatter: %w", err)
+	}
+
 	return &Runner{
 		Processors: []processors.Processor{
 			processors.NewCgo(goenv),
@@ -95,6 +100,8 @@ func NewRunner(log logutils.Log, cfg *config.Config, args []string, goenv *gouti
 
 			// The fixer still needs to see paths for the issues that are relative to the current directory.
 			processors.NewFixer(cfg, log, fileCache),
+			// The formatter needs to be after the fixer and the last processor that write files.
+			formatter,
 
 			// Now we can modify the issues for output.
 			processors.NewPathPrefixer(cfg.Output.PathPrefix),

pkg/result/processors/fixer.go

@@ -18,6 +18,10 @@ import (
 	"github.com/golangci/golangci-lint/internal/x/tools/diff"
 	"github.com/golangci/golangci-lint/pkg/config"
 	"github.com/golangci/golangci-lint/pkg/fsutils"
+	"github.com/golangci/golangci-lint/pkg/goformatters/gci"
+	"github.com/golangci/golangci-lint/pkg/goformatters/gofmt"
+	"github.com/golangci/golangci-lint/pkg/goformatters/gofumpt"
+	"github.com/golangci/golangci-lint/pkg/goformatters/goimports"
 	"github.com/golangci/golangci-lint/pkg/logutils"
 	"github.com/golangci/golangci-lint/pkg/result"
 	"github.com/golangci/golangci-lint/pkg/timeutils"
@@ -71,11 +75,18 @@ func (p Fixer) process(issues []result.Issue) ([]result.Issue, error) {
 	// filenames / linters / edits
 	editsByLinter := make(map[string]map[string][]diff.Edit)
 
+	formatters := []string{gofumpt.Name, goimports.Name, gofmt.Name, gci.Name}
+
 	var notFixableIssues []result.Issue
 
 	for i := range issues {
 		issue := issues[i]
 
+		if slices.Contains(formatters, issue.FromLinter) {
+			notFixableIssues = append(notFixableIssues, issue)
+			continue
+		}
+
 		if issue.SuggestedFixes == nil || skipNoTextEdit(&issue) {
 			notFixableIssues = append(notFixableIssues, issue)
 			continue