use filepath.WalkDir instead of filepath.Walk

requires Go 1.16 or later

.github/workflows/build.yml

@@ -10,6 +10,6 @@ jobs:
     - name: Setup Go
       uses: actions/setup-go@v2
       with:
-        go-version: '1.x'
+        go-version: '1.16'
     - name: Run tests
       run: go test -cover ./...

analyze.go

@@ -9,6 +9,7 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
+	"io/fs"
 	"log"
 	"os"
 	"path/filepath"
@@ -39,17 +40,17 @@ func Analyze(paths []string, ignore *regexp.Regexp) Stats {
 }
 
 func analyzeDir(dirname string, ignore *regexp.Regexp, stats Stats) Stats {
-	filepath.Walk(dirname, func(path string, info os.FileInfo, err error) error {
-		if err == nil && isGoFile(info) {
+	filepath.WalkDir(dirname, func(path string, entry fs.DirEntry, err error) error {
+		if err == nil && isGoFile(entry) {
 			stats = analyzeFile(path, ignore, stats)
 		}
 		return err
 	})
 	return stats
 }
 
-func isGoFile(f os.FileInfo) bool {
-	return !f.IsDir() && strings.HasSuffix(f.Name(), ".go")
+func isGoFile(entry fs.DirEntry) bool {
+	return !entry.IsDir() && strings.HasSuffix(entry.Name(), ".go")
 }
 
 func analyzeFile(path string, ignore *regexp.Regexp, stats Stats) Stats {

go.mod

@@ -1,3 +1,3 @@
 module github.com/fzipp/gocyclo
 
-go 1.15
+go 1.16