resources: Move resource interfaces into its own package

1 files changed, 48 insertions, 0 deletions

diff --git a/resources/internal/glob.go b/resources/internal/glob.go
new file mode 100644
index 000000000..a87a23f13
--- /dev/null
+++ b/resources/internal/glob.go
@@ -0,0 +1,48 @@
+// 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 internal
+
+import (
+	"strings"
+	"sync"
+
+	"github.com/gobwas/glob"
+)
+
+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
+
+}