dev: change format like function without args (golangci#3012)

Co-authored-by: Fernandez Ludovic <ldez@users.noreply.github.com>

internal/cache/cache.go

@@ -58,7 +58,7 @@ func Open(dir string) (*Cache, error) {
 		return nil, err
 	}
 	if !info.IsDir() {
-		return nil, &os.PathError{Op: "open", Path: dir, Err: fmt.Errorf("not a directory")}
+		return nil, &os.PathError{Op: "open", Path: dir, Err: errors.New("not a directory")}
 	}
 	for i := 0; i < 256; i++ {
 		name := filepath.Join(dir, fmt.Sprintf("%02x", i))
@@ -504,7 +504,7 @@ func (c *Cache) copyFile(file io.ReadSeeker, out OutputID, size int64) error {
 	sum := h.Sum(nil)
 	if !bytes.Equal(sum, out[:]) {
 		_ = f.Truncate(0)
-		return fmt.Errorf("file content changed underfoot")
+		return errors.New("file content changed underfoot")
 	}
 
 	// Commit cache file entry.

internal/cache/default.go

@@ -5,6 +5,7 @@
 package cache
 
 import (
+	"errors"
 	"fmt"
 	"log"
 	"os"
@@ -69,7 +70,7 @@ func DefaultDir() string {
 			return
 		}
 		if defaultDir != "" {
-			defaultDirErr = fmt.Errorf("GOLANGCI_LINT_CACHE is not an absolute path")
+			defaultDirErr = errors.New("GOLANGCI_LINT_CACHE is not an absolute path")
 			return
 		}
 

pkg/commands/run.go

@@ -281,7 +281,7 @@ func (e *Executor) initRun() {
 		Run:   e.executeRun,
 		PreRunE: func(_ *cobra.Command, _ []string) error {
 			if ok := e.acquireFileLock(); !ok {
-				return fmt.Errorf("parallel golangci-lint is running")
+				return errors.New("parallel golangci-lint is running")
 			}
 			return nil
 		},

pkg/config/linters_settings_gocritic_test.go

@@ -1,7 +1,7 @@
 package config
 
 import (
-	"fmt"
+	"log"
 	"sort"
 	"testing"
 
@@ -10,45 +10,50 @@ import (
 	"github.com/golangci/golangci-lint/pkg/logutils"
 )
 
-func TestUtils(t *testing.T) {
+func Test_intersectStringSlice(t *testing.T) {
 	s1 := []string{"diagnostic", "experimental", "opinionated"}
 	s2 := []string{"opinionated", "experimental"}
+
 	s3 := intersectStringSlice(s1, s2)
+
 	sort.Strings(s3)
+
 	assert.Equal(t, s3, []string{"experimental", "opinionated"})
 }
 
+func Test_filterByDisableTags(t *testing.T) {
+	disabledTags := []string{"experimental", "opinionated"}
+	enabledChecks := []string{"appendAssign", "sortSlice", "caseOrder", "dupImport"}
+
+	filterEnabledChecks := filterByDisableTags(enabledChecks, disabledTags, &tLog{})
+
+	sort.Strings(filterEnabledChecks)
+
+	assert.Equal(t, []string{"appendAssign", "caseOrder"}, filterEnabledChecks)
+}
+
 type tLog struct{}
 
 func (l *tLog) Fatalf(format string, args ...interface{}) {
-	fmt.Printf(fmt.Sprintf(format, args...) + "\n")
+	log.Printf(format, args...)
 }
 
 func (l *tLog) Panicf(format string, args ...interface{}) {
-	fmt.Printf(fmt.Sprintf(format, args...) + "\n")
+	log.Printf(format, args...)
 }
 
 func (l *tLog) Errorf(format string, args ...interface{}) {
-	fmt.Printf(fmt.Sprintf(format, args...) + "\n")
+	log.Printf(format, args...)
 }
 
 func (l *tLog) Warnf(format string, args ...interface{}) {
-	fmt.Printf(fmt.Sprintf(format, args...) + "\n")
+	log.Printf(format, args...)
 }
 
 func (l *tLog) Infof(format string, args ...interface{}) {
-	fmt.Printf(fmt.Sprintf(format, args...) + "\n")
+	log.Printf(format, args...)
 }
 
 func (l *tLog) Child(name string) logutils.Log { return nil }
 
 func (l *tLog) SetLevel(level logutils.LogLevel) {}
-
-func TestFilterByDisableTags(t *testing.T) {
-	testLog := &tLog{}
-	disabledTags := []string{"experimental", "opinionated"}
-	enabledChecks := []string{"appendAssign", "sortSlice", "caseOrder", "dupImport"}
-	filterEnabledChecks := filterByDisableTags(enabledChecks, disabledTags, testLog)
-	sort.Strings(filterEnabledChecks)
-	assert.Equal(t, []string{"appendAssign", "caseOrder"}, filterEnabledChecks)
-}

pkg/config/reader.go

@@ -79,7 +79,7 @@ func (r *FileReader) parseConfig() error {
 	r.log.Infof("Used config file %s", usedConfigFile)
 	usedConfigDir := filepath.Dir(usedConfigFile)
 	if usedConfigDir, err = filepath.Abs(usedConfigDir); err != nil {
-		return fmt.Errorf("can't get config directory")
+		return errors.New("can't get config directory")
 	}
 	r.cfg.cfgDir = usedConfigDir
 
@@ -216,7 +216,7 @@ func (r *FileReader) parseConfigOption() (string, error) {
 
 	configFile := cfg.Run.Config
 	if cfg.Run.NoConfig && configFile != "" {
-		return "", fmt.Errorf("can't combine option --config and --no-config")
+		return "", errors.New("can't combine option --config and --no-config")
 	}
 
 	if cfg.Run.NoConfig {
@@ -225,7 +225,7 @@ func (r *FileReader) parseConfigOption() (string, error) {
 
 	configFile, err := homedir.Expand(configFile)
 	if err != nil {
-		return "", fmt.Errorf("failed to expand configuration path")
+		return "", errors.New("failed to expand configuration path")
 	}
 
 	return configFile, nil

pkg/golinters/goanalysis/linter.go

@@ -108,7 +108,7 @@ func (lnt *Linter) configureAnalyzer(a *analysis.Analyzer, cfg map[string]interf
 		if f == nil {
 			validFlagNames := allFlagNames(&a.Flags)
 			if len(validFlagNames) == 0 {
-				return fmt.Errorf("analyzer doesn't have settings")
+				return errors.New("analyzer doesn't have settings")
 			}
 
 			return fmt.Errorf("analyzer doesn't have setting %q, valid settings: %v",

pkg/lint/lintersdb/validator.go

@@ -1,6 +1,7 @@
 package lintersdb
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 
@@ -47,20 +48,20 @@ func (v Validator) validatePresets(cfg *config.Linters) error {
 	}
 
 	if len(cfg.Presets) != 0 && cfg.EnableAll {
-		return fmt.Errorf("--presets is incompatible with --enable-all")
+		return errors.New("--presets is incompatible with --enable-all")
 	}
 
 	return nil
 }
 
 func (v Validator) validateAllDisableEnableOptions(cfg *config.Linters) error {
 	if cfg.EnableAll && cfg.DisableAll {
-		return fmt.Errorf("--enable-all and --disable-all options must not be combined")
+		return errors.New("--enable-all and --disable-all options must not be combined")
 	}
 
 	if cfg.DisableAll {
 		if len(cfg.Enable) == 0 && len(cfg.Presets) == 0 {
-			return fmt.Errorf("all linters were disabled, but no one linter was enabled: must enable at least one")
+			return errors.New("all linters were disabled, but no one linter was enabled: must enable at least one")
 		}
 
 		if len(cfg.Disable) != 0 {

pkg/result/processors/autogenerated_exclude.go

@@ -1,7 +1,6 @@
 package processors
 
 import (
-	"fmt"
 	"go/parser"
 	"go/token"
 	"path/filepath"
@@ -103,7 +102,7 @@ func (p *AutogeneratedExclude) getOrCreateFileSummary(i *result.Issue) (*ageFile
 	p.fileSummaryCache[i.FilePath()] = fs
 
 	if i.FilePath() == "" {
-		return nil, fmt.Errorf("no file path for issue")
+		return nil, errors.New("no file path for issue")
 	}
 
 	doc, err := getDoc(i.FilePath())

pkg/result/processors/nolint.go

@@ -1,7 +1,7 @@
 package processors
 
 import (
-	"fmt"
+	"errors"
 	"go/ast"
 	"go/parser"
 	"go/token"
@@ -105,7 +105,7 @@ func (p *Nolint) getOrCreateFileData(i *result.Issue) (*fileData, error) {
 	p.cache[i.FilePath()] = fd
 
 	if i.FilePath() == "" {
-		return nil, fmt.Errorf("no file path for issue")
+		return nil, errors.New("no file path for issue")
 	}
 
 	// TODO: migrate this parsing to go/analysis facts

scripts/expand_website_templates/main.go

@@ -50,7 +50,7 @@ func main() {
 	if err := rewriteDocs(replacements); err != nil {
 		log.Fatalf("Failed to rewrite docs: %s", err)
 	}
-	log.Printf("Successfully expanded templates")
+	log.Print("Successfully expanded templates")
 }
 
 func updateStateFile(replacements map[string]string) error {

test/bench/bench_test.go

@@ -2,6 +2,7 @@ package bench
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"go/build"
 	"log"
@@ -123,7 +124,7 @@ func getLinterMemoryMB(b *testing.B, progName string) (int, error) {
 		}
 	}
 	if progPID == 0 {
-		return 0, fmt.Errorf("no process")
+		return 0, errors.New("no process")
 	}
 
 	allProgPIDs := []int{progPID}

test/errchk.go

@@ -96,7 +96,7 @@ func errorCheck(outStr string, wantAuto bool, defaultWantedLinter string, fullsh
 	}
 
 	if len(out) > 0 {
-		errs = append(errs, fmt.Errorf("unmatched errors"))
+		errs = append(errs, errors.New("unmatched errors"))
 		for _, errLine := range out {
 			errs = append(errs, fmt.Errorf("%s", errLine))
 		}

test/testdata_etc/abspath/with_issue.go

@@ -6,6 +6,6 @@ func f() {
 	if true {
 		return
 	} else {
-		fmt.Printf("")
+		fmt.Print("")
 	}
 }