Conform Substring to RESPStringRenderable (#111)

Author: adam-fowler

Sources/Valkey/RESP/RESPRenderable.swift

@@ -54,6 +54,16 @@ extension String: RESPRenderable {
     }
 }
 
+extension Substring: RESPRenderable {
+    @inlinable
+    public var respEntries: Int { 1 }
+
+    @inlinable
+    public func encode(into commandEncoder: inout ValkeyCommandEncoder) {
+        commandEncoder.encodeBulkString(self)
+    }
+}
+
 extension Array: RESPRenderable where Element: RESPRenderable {
     @inlinable
     public var respEntries: Int {

Sources/Valkey/RESP/RESPStringRenderable.swift

@@ -27,6 +27,8 @@ public protocol RESPStringRenderable: Sendable, Hashable {
 
 extension String: RESPStringRenderable {}
 
+extension Substring: RESPStringRenderable {}
+
 extension ByteBuffer: RESPStringRenderable {
     public func encode(into commandEncoder: inout ValkeyCommandEncoder) {
         commandEncoder.encodeBulkString(self.readableBytesView)

Sources/Valkey/ValkeyCommandEncoder.swift

@@ -38,6 +38,16 @@ public struct ValkeyCommandEncoder {
         buffer.writeStaticString("\r\n")
     }
 
+    @inlinable
+    mutating func encodeBulkString(_ string: Substring) {
+        encodeIdentifier(.bulkString)
+
+        buffer.writeString(String(string.utf8.count))
+        buffer.writeStaticString("\r\n")
+        buffer.writeSubstring(string)
+        buffer.writeStaticString("\r\n")
+    }
+
     @inlinable
     mutating func encodeBulkString<Bytes: Collection>(_ string: Bytes) where Bytes.Element == UInt8 {
         encodeIdentifier(.bulkString)