Expose smart path splitter as a utility.

api/internal/utils/pathsplitter.go

@@ -0,0 +1,22 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package utils
+
+import "strings"
+
+// PathSplitter splits a slash delimited string, permitting escaped slashes.
+func PathSplitter(path string) []string {
+	ps := strings.Split(path, "/")
+	var res []string
+	res = append(res, ps[0])
+	for i := 1; i < len(ps); i++ {
+		last := len(res) - 1
+		if strings.HasSuffix(res[last], `\`) {
+			res[last] = strings.TrimSuffix(res[last], `\`) + "/" + ps[i]
+		} else {
+			res = append(res, ps[i])
+		}
+	}
+	return res
+}

api/internal/utils/pathsplitter_test.go

@@ -0,0 +1,49 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package utils_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	. "sigs.k8s.io/kustomize/api/internal/utils"
+)
+
+func TestPathSplitter(t *testing.T) {
+	for _, tc := range []struct {
+		exp  []string
+		path string
+	}{
+		{
+			path: "",
+			exp:  []string{""},
+		},
+		{
+			path: "s",
+			exp:  []string{"s"},
+		},
+		{
+			path: "a/b/c",
+			exp:  []string{"a", "b", "c"},
+		},
+		{
+			path: `a/b[]/c`,
+			exp:  []string{"a", "b[]", "c"},
+		},
+		{
+			path: `a/b\/c/d\/e/f`,
+			exp:  []string{"a", "b/c", "d/e", "f"},
+		},
+		{
+			// The actual reason for this.
+			path: `metadata/annotations/nginx.ingress.kubernetes.io\/auth-secret`,
+			exp: []string{
+				"metadata",
+				"annotations",
+				"nginx.ingress.kubernetes.io/auth-secret"},
+		},
+	} {
+		assert.Equal(t, tc.exp, PathSplitter(tc.path))
+	}
+}