Rename package to swift-mustache (#27)

* Rename package to swift-mustache

* Update CI

Sources/Mustache/ContentType.swift

@@ -0,0 +1,57 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Hummingbird server framework project
+//
+// Copyright (c) 2021-2021 the Hummingbird authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See hummingbird/CONTRIBUTORS.txt for the list of Hummingbird authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+/// Protocol for content types
+public protocol MustacheContentType: Sendable {
+    /// escape text for this content type eg for HTML replace "<" with "&lt;"
+    func escapeText(_ text: String) -> String
+}
+
+/// Text content type where no character is escaped
+struct TextContentType: MustacheContentType {
+    func escapeText(_ text: String) -> String {
+        return text
+    }
+}
+
+/// HTML content where text is escaped for HTML output
+struct HTMLContentType: MustacheContentType {
+    func escapeText(_ text: String) -> String {
+        return text.htmlEscape()
+    }
+}
+
+/// Map of strings to content types.
+///
+/// The string is read from the "CONTENT_TYPE" pragma `{{% CONTENT_TYPE: type}}`. Replace type with
+/// the content type required. The default available types are `TEXT` and `HTML`. You can register your own
+/// with `MustacheContentTypes.register`.
+public enum MustacheContentTypes {
+    static func get(_ name: String) -> MustacheContentType? {
+        return self.types[name]
+    }
+
+    /// Register new content type
+    /// - Parameters:
+    ///   - contentType: Content type
+    ///   - name: String to identify it
+    public static func register(_ contentType: MustacheContentType, named name: String) {
+        self.types[name] = contentType
+    }
+
+    static var types: [String: MustacheContentType] = [
+        "HTML": HTMLContentType(),
+        "TEXT": TextContentType(),
+    ]
+}