fix: confusing-results doesn't work with pointer types (#1158)

Co-authored-by: chavacava <salvador.cavadini@gmail.com>

rule/confusing_results.go

@@ -13,14 +13,38 @@ type ConfusingResultsRule struct{}
 func (*ConfusingResultsRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
 	var failures []lint.Failure
 
-	fileAst := file.AST
-	walker := lintConfusingResults{
-		onFailure: func(failure lint.Failure) {
-			failures = append(failures, failure)
-		},
+	for _, decl := range file.AST.Decls {
+		funcDecl, ok := decl.(*ast.FuncDecl)
+
+		isFunctionWithMoreThanOneResult := ok && funcDecl.Type.Results != nil && len(funcDecl.Type.Results.List) > 1
+		if !isFunctionWithMoreThanOneResult {
+			continue
 		}
 
-	ast.Walk(walker, fileAst)
+		resultsAreNamed := len(funcDecl.Type.Results.List[0].Names) > 0
+		if resultsAreNamed {
+			continue
+		}
+
+		lastType := ""
+		for _, result := range funcDecl.Type.Results.List {
+
+			resultTypeName := gofmt(result.Type)
+
+			if resultTypeName == lastType {
+				failures = append(failures, lint.Failure{
+					Node:       result,
+					Confidence: 1,
+					Category:   "naming",
+					Failure:    "unnamed results of the same type may be confusing, consider using named results",
+				})
+
+				break
+			}
+
+			lastType = resultTypeName
+		}
+	}
 
 	return failures
 }
@@ -29,38 +53,3 @@ func (*ConfusingResultsRule) Apply(file *lint.File, _ lint.Arguments) []lint.Fai
 func (*ConfusingResultsRule) Name() string {
 	return "confusing-results"
 }
-
-type lintConfusingResults struct {
-	onFailure func(lint.Failure)
-}
-
-func (w lintConfusingResults) Visit(n ast.Node) ast.Visitor {
-	fn, ok := n.(*ast.FuncDecl)
-	if !ok || fn.Type.Results == nil || len(fn.Type.Results.List) < 2 {
-		return w
-	}
-	lastType := ""
-	for _, result := range fn.Type.Results.List {
-		if len(result.Names) > 0 {
-			return w
-		}
-
-		t, ok := result.Type.(*ast.Ident)
-		if !ok {
-			return w
-		}
-
-		if t.Name == lastType {
-			w.onFailure(lint.Failure{
-				Node:       n,
-				Confidence: 1,
-				Category:   "naming",
-				Failure:    "unnamed results of the same type may be confusing, consider using named results",
-			})
-			break
-		}
-		lastType = t.Name
-	}
-
-	return w
-}

testdata/confusing_results.go

@@ -18,3 +18,11 @@ func GetTaz(a string, b int) string {
 func (t *t) GetTaz(a int, b int) {
 
 }
+
+func namedResults() (a string, b string) {
+	return "nil", "nil"
+}
+
+func pointerResults() (*string, *string) { // MATCH /unnamed results of the same type may be confusing, consider using named results/
+	return nil, nil
+}