Split tags into separate files

Sources/NowTag.swift

@@ -0,0 +1,43 @@
+#if !os(Linux)
+import Foundation
+
+
+public class NowNode : NodeType {
+  public let format:Variable
+
+  public class func parse(parser:TokenParser, token:Token) throws -> NodeType {
+    var format:Variable?
+
+    let components = token.components()
+    guard components.count <= 2 else {
+      throw TemplateSyntaxError("'now' tags may only have one argument: the format string `\(token.contents)`.")
+    }
+    if components.count == 2 {
+      format = Variable(components[1])
+    }
+
+    return NowNode(format:format)
+  }
+
+  public init(format:Variable?) {
+    self.format = format ?? Variable("\"yyyy-MM-dd 'at' HH:mm\"")
+  }
+
+  public func render(context: Context) throws -> String {
+    let date = NSDate()
+    let format = try self.format.resolve(context)
+    var formatter:NSDateFormatter?
+
+    if let format = format as? NSDateFormatter {
+      formatter = format
+    } else if let format = format as? String {
+      formatter = NSDateFormatter()
+      formatter!.dateFormat = format
+    } else {
+      return ""
+    }
+
+    return formatter!.stringFromDate(date)
+  }
+}
+#endif