output: Add output type

media/mediaType.go

@@ -0,0 +1,66 @@
+// Copyright 2017-present 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 media
+
+import (
+	"fmt"
+)
+
+type Types []Type
+
+// A media type (also known as MIME type and content type) is a two-part identifier for
+// file formats and format contents transmitted on the Internet.
+// For Hugo's use case, we use the top-level type name / subtype name + suffix.
+// One example would be image/jpeg+jpg
+// If suffix is not provided, the sub type will be used.
+// See // https://en.wikipedia.org/wiki/Media_type
+type Type struct {
+	Type    string // i.e. text
+	SubType string // i.e. html
+	Suffix  string // i.e html
+}
+
+// Key return a key used to identify this media type. Hugo will register a set of
+// default media types. These can be overridden by the user in the configuration,
+// by defining a media type with the same Key.
+func (m Type) Key() string {
+	return fmt.Sprintf("%s/%s", m.Type, m.SubType)
+}
+
+func (m Type) String() string {
+	if m.Suffix != "" {
+		return fmt.Sprintf("%s/%s+%s", m.Type, m.SubType, m.Suffix)
+	}
+	return fmt.Sprintf("%s/%s", m.Type, m.SubType)
+}
+
+var (
+	HTMLType = Type{"text", "html", "html"}
+	RSSType  = Type{"application", "rss", "xml"}
+)
+
+// DefaultMediaTypes holds a default set of media types by Hugo.
+// These can be ovverriden, and more added if needed, in the Hugo configuration file.
+// The final media type set set will also be added as extensions to mime so
+// they will be recognised by the built-in server in Hugo.
+// TODO(bep) output remove
+var DefaultMediaTypes = Types{
+	HTMLType,
+	RSSType,
+
+	// TODO(bep) output
+}
+
+// TODO(bep) output mime.AddExtensionType
+// TODO(bep) text/template vs html/template