support UUID

Author: wickwirew

Sources/Compiler/Gen/SwiftGenerator.swift

@@ -187,8 +187,9 @@ public struct SwiftGenerator: Language {
         queries: [Query]
     ) throws -> SourceFileSyntax {
         return try SourceFileSyntax {
+            try ImportDeclSyntax("import Foundation")
             try ImportDeclSyntax("import Feather")
-            
+
             for table in tables {
                 table
             }

Sources/Feather/DatabasePrimitive.swift

@@ -6,6 +6,7 @@
 //
 
 import SQLite3
+import Foundation
 
 @usableFromInline let SQLITE_TRANSIENT = unsafeBitCast(-1, to: sqlite3_destructor_type.self)
 
@@ -102,3 +103,21 @@ extension Optional: DatabasePrimitive where Wrapped: DatabasePrimitive {
         }
     }
 }
+
+extension UUID: DatabasePrimitive {
+    @inlinable public init(from cursor: OpaquePointer, at index: Int32) throws(FeatherError) {
+        guard let ptr = sqlite3_column_text(cursor, index) else {
+            throw .columnIsNil(index)
+        }
+
+        guard let value = UUID(uuidString: String(cString: ptr)) else {
+            throw .invalidUuidString
+        }
+        
+        self = value
+    }
+
+    @inlinable public func bind(to statement: OpaquePointer, at index: Int32) throws(FeatherError) {
+        try uuidString.bind(to: statement, at: index)
+    }
+}

Sources/Feather/FeatherError.swift

@@ -20,4 +20,5 @@ public enum FeatherError: Error {
     /// A query observation was attempted
     /// to be started twice.
     case subscriptionAlreadyStarted
+    case invalidUuidString
 }