Introduce flag -skip-regexp to skip file name

.golangci.yml

@@ -78,7 +78,7 @@ linters:
     - structcheck
     - typecheck
     #- unused # false positives
-    - varcheck
+    #- varcheck # false positives
     ## disabled by default
     - bodyclose
     - dupl

main.go

@@ -1,11 +1,14 @@
 package main
 
 import (
+	"flag"
+
 	"golang.org/x/tools/go/analysis/singlechecker"
 
 	"github.com/maratori/testpackage/pkg/testpackage"
 )
 
 func main() {
-	singlechecker.Main(testpackage.Analyzer)
+	skip := flag.String("skip-regexp", testpackage.DefaultSkipRegexp, `regexp pattern to skip file by name. To not skip files use -skip-regexp="^$"`) // nolint:lll
+	singlechecker.Main(testpackage.NewAnalyzer(skip))
 }

pkg/testpackage/testdata/good/export_test.go

@@ -0,0 +1 @@
+package good

pkg/testpackage/testdata/good/good_internal_test.go

@@ -0,0 +1 @@
+package good

pkg/testpackage/testdata/good/internal_test.go

@@ -0,0 +1 @@
+package good

pkg/testpackage/testpackage.go

@@ -1,28 +1,40 @@
 package testpackage
 
 import (
+	"regexp"
 	"strings"
 
 	"golang.org/x/tools/go/analysis"
 )
 
-// Analyzer that make you use a separate _test package
-var Analyzer = &analysis.Analyzer{ // nolint:gochecknoglobals,varcheck
-	Name: "testpackage",
-	Doc:  "linter that make you use a separate _test package",
-	Run:  run,
-}
+const DefaultSkipRegexp = `(export|internal)_test\.go`
 
-func run(pass *analysis.Pass) (interface{}, error) {
-	for _, f := range pass.Files {
-		fileName := pass.Fset.Position(f.Pos()).Filename
-		if strings.HasSuffix(fileName, "_test.go") {
-			packageName := f.Name.Name
-			if !strings.HasSuffix(packageName, "_test") {
-				pass.Reportf(f.Name.Pos(), `package should be "%s_test" instead of "%s"`, packageName, packageName)
+// NewAnalyzer returns Analyzer that make you use a separate _test package
+func NewAnalyzer(skipFileRegexp *string) *analysis.Analyzer {
+	return &analysis.Analyzer{
+		Name: "testpackage",
+		Doc:  "linter that make you use a separate _test package",
+		Run: func(pass *analysis.Pass) (interface{}, error) {
+			skipFile, err := regexp.Compile(*skipFileRegexp)
+			if err != nil {
+				return nil, err
 			}
-		}
-	}
 
-	return nil, nil
+			for _, f := range pass.Files {
+				fileName := pass.Fset.Position(f.Pos()).Filename
+				if skipFile.MatchString(fileName) {
+					continue
+				}
+
+				if strings.HasSuffix(fileName, "_test.go") {
+					packageName := f.Name.Name
+					if !strings.HasSuffix(packageName, "_test") {
+						pass.Reportf(f.Name.Pos(), `package should be "%s_test" instead of "%s"`, packageName, packageName)
+					}
+				}
+			}
+
+			return nil, nil
+		},
+	}
 }

pkg/testpackage/testpackage_test.go

@@ -15,7 +15,8 @@ func TestAnalyzer_Good(t *testing.T) {
 		t.FailNow()
 	}
 
-	analysistest.Run(t, testdata, testpackage.Analyzer)
+	skip := testpackage.DefaultSkipRegexp
+	analysistest.Run(t, testdata, testpackage.NewAnalyzer(&skip))
 }
 
 func TestAnalyzer_Bad(t *testing.T) {
@@ -24,5 +25,6 @@ func TestAnalyzer_Bad(t *testing.T) {
 		t.FailNow()
 	}
 
-	analysistest.Run(t, testdata, testpackage.Analyzer)
+	skip := testpackage.DefaultSkipRegexp
+	analysistest.Run(t, testdata, testpackage.NewAnalyzer(&skip))
 }