Flatten file directories (fixes #159)

Sources/Tweak.swift

@@ -0,0 +1,70 @@
+//
+//  Tweak.swift
+//  CoreStore
+//
+//  Copyright © 2015 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import Foundation
+import CoreData
+
+
+// MARK: - Tweak
+
+/**
+ The `Tweak` clause allows fine-tuning the `NSFetchRequest` for a fetch or query.
+ Sample usage:
+ ```
+ let employees = transaction.fetchAll(
+     From<MyPersonEntity>(),
+     Tweak { (fetchRequest) -> Void in
+         fetchRequest.includesPendingChanges = false
+         fetchRequest.fetchLimit = 5
+     }
+ )
+ ```
+ */
+public struct Tweak: FetchClause, QueryClause, DeleteClause {
+    
+    /**
+     The block to customize the `NSFetchRequest`
+     */
+    public let closure: (_ fetchRequest: NSFetchRequest<NSFetchRequestResult>) -> Void
+    
+    /**
+     Initializes a `Tweak` clause with a closure where the `NSFetchRequest` may be configured.
+     
+     - Important: `Tweak`'s closure is executed only just before the fetch occurs, so make sure that any values captured by the closure is not prone to race conditions. Also, some utilities (such as `ListMonitor`s) may keep `FetchClause`s in memory and may thus introduce retain cycles if reference captures are not handled properly.
+     - parameter closure: the block to customize the `NSFetchRequest`
+     */
+    public init(_ closure: @escaping (_ fetchRequest: NSFetchRequest<NSFetchRequestResult>) -> Void) {
+        
+        self.closure = closure
+    }
+    
+    
+    // MARK: FetchClause, QueryClause, DeleteClause
+    
+    public func applyToFetchRequest<ResultType: NSFetchRequestResult>(_ fetchRequest: NSFetchRequest<ResultType>) {
+        
+        self.closure(fetchRequest as! NSFetchRequest<NSFetchRequestResult>)
+    }
+}