feat: migrate gofmt

Author: ldez

pkg/golinters/gofmt/gofmt.go

@@ -1,90 +1,28 @@
 package gofmt
 
 import (
-	"bytes"
-	"fmt"
-	"os"
-	"path/filepath"
-	"strings"
-
-	"github.com/rogpeppe/go-internal/diff"
 	"golang.org/x/tools/go/analysis"
 
-	"github.com/golangci/gofmt/gofmt"
 	"github.com/golangci/golangci-lint/pkg/config"
 	"github.com/golangci/golangci-lint/pkg/goanalysis"
+	"github.com/golangci/golangci-lint/pkg/goformatters"
+	gofmtbase "github.com/golangci/golangci-lint/pkg/goformatters/gofmt"
 	"github.com/golangci/golangci-lint/pkg/golinters/internal"
-	"github.com/golangci/golangci-lint/pkg/lint/linter"
 )
 
 const linterName = "gofmt"
 
 func New(settings *config.GoFmtSettings) *goanalysis.Linter {
-	analyzer := &analysis.Analyzer{
-		Name: linterName,
-		Doc:  goanalysis.TheOnlyanalyzerDoc,
-		Run:  goanalysis.DummyRun,
-	}
-
-	var options gofmt.Options
-	if settings != nil {
-		options = gofmt.Options{NeedSimplify: settings.Simplify}
-
-		for _, rule := range settings.RewriteRules {
-			options.RewriteRules = append(options.RewriteRules, gofmt.RewriteRule(rule))
-		}
-	}
+	a := goformatters.NewAnalyzer(
+		internal.LinterLogger.Child(linterName),
+		"Checks if the code is formatted according to 'gofmt' command.",
+		gofmtbase.New(settings),
+	)
 
 	return goanalysis.NewLinter(
-		linterName,
-		"Checks if the code is formatted according to 'gofmt' command.",
-		[]*analysis.Analyzer{analyzer},
+		a.Name,
+		a.Doc,
+		[]*analysis.Analyzer{a},
 		nil,
-	).WithContextSetter(func(lintCtx *linter.Context) {
-		analyzer.Run = func(pass *analysis.Pass) (any, error) {
-			err := run(lintCtx, pass, options)
-			if err != nil {
-				return nil, err
-			}
-
-			return nil, nil
-		}
-	}).WithLoadMode(goanalysis.LoadModeSyntax)
-}
-
-func run(lintCtx *linter.Context, pass *analysis.Pass, options gofmt.Options) error {
-	for _, file := range pass.Files {
-		position, isGoFile := goanalysis.GetGoFilePosition(pass, file)
-		if !isGoFile {
-			continue
-		}
-
-		if !strings.HasSuffix(position.Filename, ".go") {
-			continue
-		}
-
-		input, err := os.ReadFile(position.Filename)
-		if err != nil {
-			return fmt.Errorf("unable to open file %s: %w", position.Filename, err)
-		}
-
-		output, err := gofmt.Source(position.Filename, input, options)
-		if err != nil {
-			return fmt.Errorf("error while running goimports: %w", err)
-		}
-
-		if !bytes.Equal(input, output) {
-			newName := filepath.ToSlash(position.Filename)
-			oldName := newName + ".orig"
-
-			theDiff := diff.Diff(oldName, input, newName, output)
-
-			err = internal.ExtractDiagnosticFromPatch(pass, file, string(theDiff), lintCtx)
-			if err != nil {
-				return fmt.Errorf("can't extract issues from goimports diff output %q: %w", string(theDiff), err)
-			}
-		}
-	}
-
-	return nil
+	).WithLoadMode(goanalysis.LoadModeSyntax)
 }