Add transforms empty() and equalzero()

Sources/HummingbirdMustache/Transform.swift

@@ -64,6 +64,8 @@ extension Array: HBMustacheTransformable {
             return reversed()
         case "count":
             return count
+        case "empty":
+            return isEmpty
         default:
             if let comparableSeq = self as? HBComparableSequence {
                 return comparableSeq.comparableTransform(name)
@@ -95,6 +97,8 @@ extension Dictionary: HBMustacheTransformable {
         switch name {
         case "count":
             return count
+        case "empty":
+            return isEmpty
         case "enumerated":
             return map { (key: $0.key, value: $0.value) }
         default:
@@ -125,6 +129,8 @@ public extension FixedWidthInteger {
     /// - Returns: Result
     func transform(_ name: String) -> Any? {
         switch name {
+        case "equalzero":
+            return self == 0
         case "plusone":
             return self + 1
         case "minusone":

Tests/HummingbirdMustacheTests/TransformTests.swift

@@ -128,6 +128,14 @@ final class TransformTests: XCTestCase {
         """)
     }
 
+    func testDictionaryEmpty() throws {
+        let template = try HBMustacheTemplate(string: """
+        {{#empty(array)}}Array{{/empty(array)}}{{#empty(dictionary)}}Dictionary{{/empty(dictionary)}}
+        """)
+        let object: [String: Any] = ["array":[], "dictionary":[:]]
+        XCTAssertEqual(template.render(object), "ArrayDictionary")
+    }
+
     func testListOutput() throws {
         let object = [1, 2, 3, 4]
         let template = try HBMustacheTemplate(string: "{{#.}}{{.}}{{^last()}}, {{/last()}}{{/.}}")