drafting simple plugin system

MacPass/MPGenericPlugin.h

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+//
+//  MPGenericPlugin.h
+//  MacPass
+//
+//  Created by Michael Starke on 16/07/15.
+//  Copyright (c) 2015 HicknHack Software GmbH. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@class MPPluginManager
+
+@protocol MPGenericPlugin <NSObject>
+
+@required
+@property (readonly) NSString *name;
+@property (readonly) NSString *version;
+@property (readonly) NSInteger *versionNumber;
+
+- (instancetype)initWithPluginManager:(MPPluginManager *)manager;
+
+@optional
+- (void)manager:(MPPluginManager *)manager willAddNode:(KPKNode *)node;
+- (void)manager:(MPPluginManager *)manager didAddNode(KPKNode *)node;
+- (void)manager:(MPPluginManager *)manager willRemoveNode:(KPKNode *)node;
+- (void)manager:(MPPluginManager *)manager didRemoveNode:(KPKNode *)node;
+
+@end

MacPass/MPPluginManager.h

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+//
+//  MPPluginManager.h
+//  MacPass
+//
+//  Created by Michael Starke on 16/07/15.
+//  Copyright (c) 2015 HicknHack Software GmbH. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@class KPKNode;
+
+@interface MPPluginManager : NSObject
+
+typedef BOOL (^NodeMatchBlock)(KPKNode *aNode);
+
++ (instancetype)sharedManager;
+
+- (NSArray *)filteredEntriesUsingBlock:(NodeMatchBlock) matchBlock;
+- (NSArray *)filteredGroupsUsingBlock:(NodeMatchBlock) matchBlock;
+
+@end

MacPass/MPPluginManager.m

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+//
+//  MPPluginManager.m
+//  MacPass
+//
+//  Created by Michael Starke on 16/07/15.
+//  Copyright (c) 2015 HicknHack Software GmbH. All rights reserved.
+//
+
+#import "MPPluginManager.h"
+
+#import "MPDocument.h"
+#import "KPKTree.h"
+
+@implementation MPPluginManager
+
++ (instancetype)sharedManager {
+  static MPPluginManager *instance;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    instance = [[MPPluginManager alloc] _init];
+  });
+  return instance;
+}
+
+- (instancetype)init {
+  return nil;
+}
+
+- (instancetype)_init {
+  self = [super init];
+  return self;
+}
+
+- (NSArray *)filteredEntriesUsingBlock:(NodeMatchBlock)matchBlock {
+  NSArray *currentDocuments = [[NSDocumentController sharedDocumentController] documents];
+  NSMutableArray *entries = [[NSMutableArray alloc] initWithCapacity:200];
+  for(MPDocument *document in currentDocuments) {
+    if(document.tree) {
+      [entries addObjectsFromArray:document.tree.allEntries];
+    }
+  }
+  NSPredicate *predicate = [NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) { return matchBlock(evaluatedObject); }];
+  return [[NSArray alloc] initWithArray:[entries filteredArrayUsingPredicate:predicate] copyItems:YES];
+}
+
+
+- (NSArray *)filteredGroupsUsingBlock:(NodeMatchBlock)matchBlock {
+  return nil;
+}
+
+
+- (void)_loadPlugins {
+
+}
+
+@end