Fix file.Readdir to not return sub-dir contents

fs/fs.go

@@ -160,7 +160,7 @@ func (f *httpFile) Readdir(count int) ([]os.FileInfo, error) {
 	}
 	prefix := f.Name()
 	for fn, f := range f.file.fs.files {
-		if strings.HasPrefix(fn, prefix) && len(fn) > len(prefix) {
+		if strings.HasPrefix(fn, prefix) && len(fn) > len(prefix) && strings.Index(strings.TrimPrefix(fn, prefix), "/") < 1 {
 			fis = append(fis, f.FileInfo)
 		}
 	}

fs/walk_test.go

@@ -0,0 +1,62 @@
+package fs
+
+import (
+	"os"
+	"testing"
+)
+
+func TestWalk(t *testing.T) {
+	type wantPath struct {
+		isDir bool
+	}
+	tests := []struct {
+		description string
+		zipData     string
+		wantPaths   map[string]wantPath
+	}{
+		{
+			zipData: mustZipTree("../testdata/index"),
+			wantPaths: map[string]wantPath{
+				"/":                   wantPath{isDir: true},
+				"/index.html":         wantPath{isDir: false},
+				"/sub_dir":            wantPath{isDir: true},
+				"/sub_dir/index.html": wantPath{isDir: false},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.description, func(t *testing.T) {
+			Register(tc.zipData)
+			fs, err := New()
+			if err != nil {
+				t.Errorf("New() = %v", err)
+				return
+			}
+
+			err = Walk(fs, "/", func(path string, info os.FileInfo, err error) error {
+				if err != nil {
+					t.Errorf("unexpected error = %v", err)
+				}
+				if wantPath, ok := tc.wantPaths[path]; ok {
+					if got, want := info.IsDir(), wantPath.isDir; got != want {
+						t.Errorf("IsDir(%v) = %t; want %t", path, got, want)
+					}
+					delete(tc.wantPaths, path)
+				} else {
+					t.Errorf("unexpected path = %v (info = %#v)", path, info)
+				}
+
+				return nil
+			})
+
+			if err != nil {
+				t.Errorf("Walk(fs, \"/\", WalkFunc) = %v", err)
+			}
+
+			if len(tc.wantPaths) != 0 {
+				t.Errorf("ignored paths: %v", tc.wantPaths)
+			}
+		})
+	}
+}