Add resources.Match and resources.GetMatch

Fix #6190

hugofs/glob/glob.go

@@ -0,0 +1,81 @@
+// Copyright 2019 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package glob
+
+import (
+	"path"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"github.com/gobwas/glob"
+	"github.com/gobwas/glob/syntax"
+)
+
+var (
+	globCache = make(map[string]glob.Glob)
+	globMu    sync.RWMutex
+)
+
+func GetGlob(pattern string) (glob.Glob, error) {
+	var g glob.Glob
+
+	globMu.RLock()
+	g, found := globCache[pattern]
+	globMu.RUnlock()
+	if !found {
+		var err error
+		g, err = glob.Compile(strings.ToLower(pattern), '/')
+		if err != nil {
+			return nil, err
+		}
+
+		globMu.Lock()
+		globCache[pattern] = g
+		globMu.Unlock()
+	}
+
+	return g, nil
+
+}
+
+func NormalizePath(p string) string {
+	return strings.Trim(filepath.ToSlash(strings.ToLower(p)), "/.")
+}
+
+// ResolveRootDir takes a normalized path on the form "assets/**.json" and
+// determines any root dir, i.e. any start path without any wildcards.
+func ResolveRootDir(p string) string {
+	parts := strings.Split(path.Dir(p), "/")
+	var roots []string
+	for _, part := range parts {
+		isSpecial := false
+		for i := 0; i < len(part); i++ {
+			if syntax.Special(part[i]) {
+				isSpecial = true
+				break
+			}
+		}
+		if isSpecial {
+			break
+		}
+		roots = append(roots, part)
+	}
+
+	if len(roots) == 0 {
+		return ""
+	}
+
+	return strings.Join(roots, "/")
+}