dev: replace raw loops with funcs from slices and maps (#4299)

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

go.mod

@@ -122,7 +122,7 @@ require (
 	gitlab.com/bosi/decorder v0.4.1
 	go-simpler.org/musttag v0.8.0
 	go-simpler.org/sloglint v0.4.0
-	golang.org/x/exp v0.0.0-20230510235704-dd950f8aeaea
+	golang.org/x/exp v0.0.0-20240103183307-be819d1f06fc
 	golang.org/x/tools v0.16.1
 	gopkg.in/yaml.v3 v3.0.1
 	honnef.co/go/tools v0.4.6

go.sum

@@ -625,8 +625,8 @@ golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u0
 golang.org/x/exp v0.0.0-20200119233911-0405dc783f0a/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
 golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
 golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
-golang.org/x/exp v0.0.0-20230510235704-dd950f8aeaea h1:vLCWI/yYrdEHyN2JzIzPO3aaQJHQdp89IZBA/+azVC4=
+golang.org/x/exp v0.0.0-20240103183307-be819d1f06fc h1:ao2WRsKSzW6KuUY9IWPwWahcHCgR0s52IfwutMfEbdM=
-golang.org/x/exp v0.0.0-20230510235704-dd950f8aeaea/go.mod h1:V1LtkGg67GoY2N1AnLN78QLrzxkLyJw7RJb1gzOOz9w=
+golang.org/x/exp v0.0.0-20240103183307-be819d1f06fc/go.mod h1:iRJReGqOEeBhDZGkGbynYwcHlctCvnjTYIamk7uXpHI=
 golang.org/x/exp/typeparams v0.0.0-20220428152302-39d4317da171/go.mod h1:AbB0pIl9nAr9wVwH+Z2ZpaocVmF5I4GyWCDIsVjR0bk=
 golang.org/x/exp/typeparams v0.0.0-20230203172020-98cc5a0785f9/go.mod h1:AbB0pIl9nAr9wVwH+Z2ZpaocVmF5I4GyWCDIsVjR0bk=
 golang.org/x/exp/typeparams v0.0.0-20231219180239-dc181d75b848 h1:UhRVJ0i7bF9n/Hd8YjW3eKjlPVBHzbQdxrBgjbSKl64=

pkg/golinters/goanalysis/runner.go

@@ -17,6 +17,7 @@ import (
 	"sort"
 	"sync"
 
+	"golang.org/x/exp/maps"
 	"golang.org/x/tools/go/analysis"
 	"golang.org/x/tools/go/packages"
 
@@ -159,10 +160,7 @@ func (r *runner) buildActionFactDeps(act *action, a *analysis.Analyzer, pkg *pac
 	act.objectFacts = make(map[objectFactKey]analysis.Fact)
 	act.packageFacts = make(map[packageFactKey]analysis.Fact)
 
-	paths := make([]string, 0, len(pkg.Imports))
+	paths := maps.Keys(pkg.Imports)
-	for path := range pkg.Imports {
-		paths = append(paths, path)
-	}
 	sort.Strings(paths) // for determinism
 	for _, path := range paths {
 		dep := r.makeAction(a, pkg.Imports[path], initialPkgs, actions, actAlloc)
@@ -212,10 +210,7 @@ func (r *runner) prepareAnalysis(pkgs []*packages.Package,
 		}
 	}
 
-	allActions := make([]*action, 0, len(actions))
+	allActions := maps.Values(actions)
-	for _, act := range actions {
-		allActions = append(allActions, act)
-	}
 
 	debugf("Built %d actions", len(actions))
 

pkg/golinters/gocritic.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/go-critic/go-critic/checkers"
 	gocriticlinter "github.com/go-critic/go-critic/linter"
+	"golang.org/x/exp/maps"
 	"golang.org/x/tools/go/analysis"
 
 	"github.com/golangci/golangci-lint/pkg/config"
@@ -219,10 +220,7 @@ func (w *goCriticWrapper) configureCheckerInfo(info *gocriticlinter.CheckerInfo,
 				info.Name, k)
 		}
 
-		var supportedKeys []string
+		supportedKeys := maps.Keys(info.Params)
-		for sk := range info.Params {
-			supportedKeys = append(supportedKeys, sk)
-		}
 		sort.Strings(supportedKeys)
 
 		return fmt.Errorf("checker %s config param %s doesn't exist, all existing: %s",
@@ -311,11 +309,7 @@ func (s *goCriticSettingsWrapper) checkerTagsDebugf() {
 
 	tagToCheckers := s.buildTagToCheckersMap()
 
-	allTags := make([]string, 0, len(tagToCheckers))
+	allTags := maps.Keys(tagToCheckers)
-	for tag := range tagToCheckers {
-		allTags = append(allTags, tag)
-	}
-
 	sort.Strings(allTags)
 
 	goCriticDebugf("All gocritic existing tags and checks:")
@@ -609,12 +603,7 @@ func intersectStringSlice(s1, s2 []string) []string {
 }
 
 func sprintAllowedCheckerNames(allowedNames map[string]bool) string {
-	namesSlice := make([]string, 0, len(allowedNames))
+	namesSlice := maps.Keys(allowedNames)
-
-	for name := range allowedNames {
-		namesSlice = append(namesSlice, name)
-	}
-
 	return sprintStrings(namesSlice)
 }
 

pkg/golinters/govet_test.go

@@ -1,9 +1,9 @@
 package golinters
 
 import (
-	"sort"
 	"testing"
 
+	"golang.org/x/exp/slices"
 	"golang.org/x/tools/go/analysis"
 	"golang.org/x/tools/go/analysis/passes/asmdecl"
 	"golang.org/x/tools/go/analysis/passes/assign"
@@ -18,39 +18,41 @@ import (
 
 func TestGovet(t *testing.T) {
 	// Checking that every default analyzer is in "all analyzers" list.
-	var checkList []*analysis.Analyzer
+	checkList := append([]*analysis.Analyzer{}, defaultAnalyzers...)
-	checkList = append(checkList, defaultAnalyzers...)
 	checkList = append(checkList, shadow.Analyzer) // special case, used in analyzersFromConfig
 
 	for _, defaultAnalyzer := range checkList {
-		found := false
+		found := slices.ContainsFunc(allAnalyzers, func(a *analysis.Analyzer) bool {
-		for _, a := range allAnalyzers {
+			return a.Name == defaultAnalyzer.Name
-			if a.Name == defaultAnalyzer.Name {
+		})
-				found = true
-				break
-			}
-		}
 		if !found {
 			t.Errorf("%s is not in allAnalyzers", defaultAnalyzer.Name)
 		}
 	}
 }
 
-type sortedAnalyzers []*analysis.Analyzer
+func sortAnalyzers(a, b *analysis.Analyzer) int {
+	if a.Name < b.Name {
+		return -1
+	}
 
-func (p sortedAnalyzers) Len() int           { return len(p) }
+	if a.Name > b.Name {
-func (p sortedAnalyzers) Less(i, j int) bool { return p[i].Name < p[j].Name }
+		return 1
-func (p sortedAnalyzers) Swap(i, j int)      { p[i].Name, p[j].Name = p[j].Name, p[i].Name }
+	}
+
+	return 0
+}
 
 func TestGovetSorted(t *testing.T) {
 	// Keeping analyzers sorted so their order match the import order.
 	t.Run("All", func(t *testing.T) {
-		if !sort.IsSorted(sortedAnalyzers(allAnalyzers)) {
+		if !slices.IsSortedFunc(allAnalyzers, sortAnalyzers) {
 			t.Error("please keep all analyzers list sorted by name")
 		}
 	})
+
 	t.Run("Default", func(t *testing.T) {
-		if !sort.IsSorted(sortedAnalyzers(defaultAnalyzers)) {
+		if !slices.IsSortedFunc(defaultAnalyzers, sortAnalyzers) {
 			t.Error("please keep default analyzers list sorted by name")
 		}
 	})

pkg/golinters/thelper.go

@@ -4,6 +4,7 @@ import (
 	"strings"
 
 	"github.com/kulti/thelper/pkg/analyzer"
+	"golang.org/x/exp/maps"
 	"golang.org/x/tools/go/analysis"
 
 	"github.com/golangci/golangci-lint/pkg/config"
@@ -42,10 +43,7 @@ func NewThelper(cfg *config.ThelperSettings) *goanalysis.Linter {
 		linterLogger.Fatalf("thelper: at least one option must be enabled")
 	}
 
-	var args []string
+	args := maps.Keys(opts)
-	for k := range opts {
-		args = append(args, k)
-	}
 
 	cfgMap := map[string]map[string]any{
 		a.Name: {

pkg/lint/lintersdb/enabled_set.go

@@ -4,6 +4,8 @@ import (
 	"os"
 	"sort"
 
+	"golang.org/x/exp/maps"
+
 	"github.com/golangci/golangci-lint/pkg/config"
 	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
 	"github.com/golangci/golangci-lint/pkg/lint/linter"
@@ -115,10 +117,7 @@ func (es EnabledSet) GetOptimizedLinters() ([]*linter.Config, error) {
 	es.verbosePrintLintersStatus(resultLintersSet)
 	es.combineGoAnalysisLinters(resultLintersSet)
 
-	var resultLinters []*linter.Config
+	resultLinters := maps.Values(resultLintersSet)
-	for _, lc := range resultLintersSet {
-		resultLinters = append(resultLinters, lc)
-	}
 
 	// Make order of execution of linters (go/analysis metalinter and unused) stable.
 	sort.Slice(resultLinters, func(i, j int) bool {
@@ -185,10 +184,7 @@ func (es EnabledSet) combineGoAnalysisLinters(linters map[string]*linter.Config)
 
 	ml := goanalysis.NewMetaLinter(goanalysisLinters)
 
-	var presets []string
+	presets := maps.Keys(goanalysisPresets)
-	for p := range goanalysisPresets {
-		presets = append(presets, p)
-	}
 
 	mlConfig := &linter.Config{
 		Linter:           ml,

pkg/printers/checkstyle.go

@@ -7,6 +7,7 @@ import (
 	"sort"
 
 	"github.com/go-xmlfmt/xmlfmt"
+	"golang.org/x/exp/maps"
 
 	"github.com/golangci/golangci-lint/pkg/result"
 )
@@ -74,10 +75,7 @@ func (p Checkstyle) Print(issues []result.Issue) error {
 		file.Errors = append(file.Errors, newError)
 	}
 
-	out.Files = make([]*checkstyleFile, 0, len(files))
+	out.Files = maps.Values(files)
-	for _, file := range files {
-		out.Files = append(out.Files, file)
-	}
 
 	sort.Slice(out.Files, func(i, j int) bool {
 		return out.Files[i].Name < out.Files[j].Name

pkg/printers/junitxml.go

@@ -7,6 +7,8 @@ import (
 	"sort"
 	"strings"
 
+	"golang.org/x/exp/maps"
+
 	"github.com/golangci/golangci-lint/pkg/result"
 )
 
@@ -71,9 +73,7 @@ func (p JunitXML) Print(issues []result.Issue) error {
 	}
 
 	var res testSuitesXML
-	for _, val := range suites {
+	res.TestSuites = maps.Values(suites)
-		res.TestSuites = append(res.TestSuites, val)
-	}
 
 	sort.Slice(res.TestSuites, func(i, j int) bool {
 		return res.TestSuites[i].Suite < res.TestSuites[j].Suite

pkg/result/processors/nolint.go

@@ -9,6 +9,8 @@ import (
 	"sort"
 	"strings"
 
+	"golang.org/x/exp/maps"
+
 	"github.com/golangci/golangci-lint/pkg/golinters"
 	"github.com/golangci/golangci-lint/pkg/lint/linter"
 	"github.com/golangci/golangci-lint/pkg/lint/lintersdb"
@@ -289,10 +291,7 @@ func (p *Nolint) Finish() {
 		return
 	}
 
-	unknownLinters := make([]string, 0, len(p.unknownLintersSet))
+	unknownLinters := maps.Keys(p.unknownLintersSet)
-	for name := range p.unknownLintersSet {
-		unknownLinters = append(unknownLinters, name)
-	}
 	sort.Strings(unknownLinters)
 
 	p.log.Warnf("Found unknown linters in //nolint directives: %s", strings.Join(unknownLinters, ", "))

scripts/expand_website_templates/main.go

@@ -16,6 +16,7 @@ import (
 	"unicode"
 	"unicode/utf8"
 
+	"golang.org/x/exp/maps"
 	"gopkg.in/yaml.v3"
 
 	"github.com/golangci/golangci-lint/internal/renameio"
@@ -360,11 +361,7 @@ func getThanksList() string {
 		}
 	}
 
-	var authors []string
+	authors := maps.Keys(addedAuthors)
-	for author := range addedAuthors {
-		authors = append(authors, author)
-	}
-
 	sort.Slice(authors, func(i, j int) bool {
 		return strings.ToLower(authors[i]) < strings.ToLower(authors[j])
 	})