feat: format fixed files with the same formatters as the issues relat…

…ed to formatting (#5267)

pkg/goformatters/meta_formatter.go

@@ -0,0 +1,74 @@
+package goformatters
+
+import (
+	"bytes"
+	"fmt"
+	"go/format"
+
+	"github.com/golangci/golangci-lint/pkg/config"
+	"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/lint/linter"
+	"github.com/golangci/golangci-lint/pkg/logutils"
+)
+
+type MetaFormatter struct {
+	log        logutils.Log
+	formatters []Formatter
+}
+
+func NewMetaFormatter(log logutils.Log, cfg *config.Config, enabledLinters map[string]*linter.Config) (*MetaFormatter, error) {
+	m := &MetaFormatter{log: log}
+
+	if _, ok := enabledLinters[gofmt.Name]; ok {
+		m.formatters = append(m.formatters, gofmt.New(cfg.LintersSettings.Gofmt))
+	}
+
+	if _, ok := enabledLinters[gofumpt.Name]; ok {
+		m.formatters = append(m.formatters, gofumpt.New(cfg.LintersSettings.Gofumpt, cfg.Run.Go))
+	}
+
+	if _, ok := enabledLinters[goimports.Name]; ok {
+		m.formatters = append(m.formatters, goimports.New())
+	}
+
+	// gci is a last because the only goal of gci is to handle imports.
+	if _, ok := enabledLinters[gci.Name]; ok {
+		formatter, err := gci.New(cfg.LintersSettings.Gci)
+		if err != nil {
+			return nil, fmt.Errorf("gci: creating formatter: %w", err)
+		}
+
+		m.formatters = append(m.formatters, formatter)
+	}
+
+	return m, nil
+}
+
+func (m *MetaFormatter) Format(filename string, src []byte) []byte {
+	if len(m.formatters) == 0 {
+		data, err := format.Source(src)
+		if err != nil {
+			m.log.Warnf("(fmt) formatting file %s: %v", filename, err)
+			return src
+		}
+
+		return data
+	}
+
+	data := bytes.Clone(src)
+
+	for _, formatter := range m.formatters {
+		formatted, err := formatter.Format(filename, data)
+		if err != nil {
+			m.log.Warnf("(%s) formatting file %s: %v", formatter.Name(), filename, err)
+			continue
+		}
+
+		data = formatted
+	}
+
+	return data
+}

pkg/lint/runner.go

@@ -10,6 +10,7 @@ import (
 	"github.com/golangci/golangci-lint/internal/errorutil"
 	"github.com/golangci/golangci-lint/pkg/config"
 	"github.com/golangci/golangci-lint/pkg/fsutils"
+	"github.com/golangci/golangci-lint/pkg/goformatters"
 	"github.com/golangci/golangci-lint/pkg/goutil"
 	"github.com/golangci/golangci-lint/pkg/lint/linter"
 	"github.com/golangci/golangci-lint/pkg/lint/lintersdb"
@@ -60,9 +61,9 @@ 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)
+	metaFormatter, err := goformatters.NewMetaFormatter(log, cfg, enabledLinters)
 	if err != nil {
-		return nil, fmt.Errorf("failed to create formatter: %w", err)
+		return nil, fmt.Errorf("failed to create meta-formatter: %w", err)
 	}
 
 	return &Runner{
@@ -99,9 +100,7 @@ func NewRunner(log logutils.Log, cfg *config.Config, args []string, goenv *gouti
 			processors.NewSeverity(log.Child(logutils.DebugKeySeverityRules), files, &cfg.Severity),
 
 			// 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,
+			processors.NewFixer(cfg, log, fileCache, metaFormatter),
 
 			// Now we can modify the issues for output.
 			processors.NewPathPrefixer(cfg.Output.PathPrefix),

pkg/result/processors/fixer.go

@@ -9,7 +9,6 @@ package processors
 import (
 	"errors"
 	"fmt"
-	"go/format"
 	"os"
 	"slices"
 
@@ -18,6 +17,7 @@ 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"
 	"github.com/golangci/golangci-lint/pkg/goformatters/gci"
 	"github.com/golangci/golangci-lint/pkg/goformatters/gofmt"
 	"github.com/golangci/golangci-lint/pkg/goformatters/gofumpt"
@@ -36,14 +36,16 @@ type Fixer struct {
 	log       logutils.Log
 	fileCache *fsutils.FileCache
 	sw        *timeutils.Stopwatch
+	formatter *goformatters.MetaFormatter
 }
 
-func NewFixer(cfg *config.Config, log logutils.Log, fileCache *fsutils.FileCache) *Fixer {
+func NewFixer(cfg *config.Config, log logutils.Log, fileCache *fsutils.FileCache, formatter *goformatters.MetaFormatter) *Fixer {
 	return &Fixer{
 		cfg:       cfg,
 		log:       log,
 		fileCache: fileCache,
 		sw:        timeutils.NewStopwatch("fixer", log),
+		formatter: formatter,
 	}
 }
 
@@ -79,11 +81,13 @@ func (p Fixer) process(issues []result.Issue) ([]result.Issue, error) {
 
 	var notFixableIssues []result.Issue
 
+	toBeFormattedFiles := make(map[string]struct{})
+
 	for i := range issues {
 		issue := issues[i]
 
 		if slices.Contains(formatters, issue.FromLinter) {
-			notFixableIssues = append(notFixableIssues, issue)
+			toBeFormattedFiles[issue.FilePath()] = struct{}{}
 			continue
 		}
 
@@ -173,6 +177,8 @@ func (p Fixer) process(issues []result.Issue) ([]result.Issue, error) {
 
 	var editError error
 
+	var formattedFiles []string
+
 	// Now we've got a set of valid edits for each file. Apply them.
 	for path, edits := range editsByPath {
 		contents, err := p.fileCache.GetFileBytes(path)
@@ -188,14 +194,32 @@ func (p Fixer) process(issues []result.Issue) ([]result.Issue, error) {
 		}
 
 		// Try to format the file.
-		if formatted, err := format.Source(out); err == nil {
-			out = formatted
-		}
+		out = p.formatter.Format(path, out)
 
 		if err := os.WriteFile(path, out, filePerm); err != nil {
 			editError = errors.Join(editError, fmt.Errorf("%s: %w", path, err))
 			continue
 		}
+
+		formattedFiles = append(formattedFiles, path)
+	}
+
+	for path := range toBeFormattedFiles {
+		// Skips files already formatted by the previous fix step.
+		if !slices.Contains(formattedFiles, path) {
+			content, err := p.fileCache.GetFileBytes(path)
+			if err != nil {
+				p.log.Warnf("Error reading file %s: %v", path, err)
+				continue
+			}
+
+			out := p.formatter.Format(path, content)
+
+			if err := os.WriteFile(path, out, filePerm); err != nil {
+				editError = errors.Join(editError, fmt.Errorf("%s: %w", path, err))
+				continue
+			}
+		}
 	}
 
 	return notFixableIssues, editError