Create SendToBlogEditorApp, which implements the sending side of the external blog editor interface: http://ranchero.com/netnewswire/developers/externalinterface

Frameworks/RSCore/RSCore/AppKit/SendToBlogEditorApp.h

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+//
+//  SendToBlogEditorApp.h
+//  RSCore
+//
+//  Created by Brent Simmons on 1/15/18.
+//  Copyright © 2018 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Cocoa;
+
+// This is for sending articles to MarsEdit and other apps that implement the send-to-blog-editor Apple events API:
+// http://ranchero.com/netnewswire/developers/externalinterface
+//
+// The first parameter is a target descriptor. The easiest way to get this is probably UserApp.targetDescriptor or +[NSAppleEventDescriptor descriptorWithRunningApplication:].
+// This does not care of launching the app in the first place. See UserApp.swift.
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface SendToBlogEditorApp : NSObject
+
+- (instancetype)initWithTargetDesciptor:(NSAppleEventDescriptor *)targetDescriptor title:(NSString * _Nullable)title body:(NSString * _Nullable)body summary:(NSString * _Nullable)summary link:(NSString * _Nullable)link permalink:(NSString * _Nullable)permalink subject:(NSString * _Nullable)subject creator:(NSString * _Nullable)creator commentsURL:(NSString * _Nullable)commentsURL guid:(NSString * _Nullable)guid sourceName:(NSString * _Nullable)sourceName sourceHomeURL:(NSString * _Nullable)sourceHomeURL sourceFeedURL:(NSString * _Nullable)sourceFeedURL;
+
+- (OSStatus)send; // Actually send the Apple event.
+
+@end
+
+NS_ASSUME_NONNULL_END
+

Frameworks/RSCore/RSCore/AppKit/SendToBlogEditorApp.m

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+//
+//  SendToBlogEditorApp.m
+//  RSCore
+//
+//  Created by Brent Simmons on 1/15/18.
+//  Copyright © 2018 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "SendToBlogEditorApp.h"
+
+@interface SendToBlogEditorApp()
+
+@property (nonatomic, readonly) NSAppleEventDescriptor *targetDescriptor;
+
+@property (nonatomic, nullable, readonly) NSString *title;
+@property (nonatomic, nullable, readonly) NSString *body;
+@property (nonatomic, nullable, readonly) NSString *summary;
+@property (nonatomic, nullable, readonly) NSString *link;
+@property (nonatomic, nullable, readonly) NSString *permalink;
+@property (nonatomic, nullable, readonly) NSString *subject;
+@property (nonatomic, nullable, readonly) NSString *creator;
+@property (nonatomic, nullable, readonly) NSString *commentsURL;
+@property (nonatomic, nullable, readonly) NSString *guid;
+@property (nonatomic, nullable, readonly) NSString *sourceName;
+@property (nonatomic, nullable, readonly) NSString *sourceHomeURL;
+@property (nonatomic, nullable, readonly) NSString *sourceFeedURL;
+
+@end
+
+@implementation SendToBlogEditorApp
+
+- (instancetype)initWithTargetDesciptor:(NSAppleEventDescriptor *)targetDescriptor title:(NSString * _Nullable)title body:(NSString * _Nullable)body summary:(NSString * _Nullable)summary link:(NSString * _Nullable)link permalink:(NSString * _Nullable)permalink subject:(NSString * _Nullable)subject creator:(NSString * _Nullable)creator commentsURL:(NSString * _Nullable)commentsURL guid:(NSString * _Nullable)guid sourceName:(NSString * _Nullable)sourceName sourceHomeURL:(NSString * _Nullable)sourceHomeURL sourceFeedURL:(NSString * _Nullable)sourceFeedURL {
+
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+
+	_targetDescriptor = targetDescriptor;
+	_title = title;
+	_body = body;
+	_summary = summary;
+	_link = link;
+	_permalink = permalink;
+	_subject = subject;
+	_creator = creator;
+	_commentsURL = commentsURL;
+	_guid = guid;
+	_sourceName = sourceName;
+	_sourceHomeURL = sourceHomeURL;
+	_sourceFeedURL = sourceFeedURL;
+	
+	return self;
+}
+
+const AEKeyword EditDataItemAppleEventClass = 'EBlg';
+const AEKeyword EditDataItemAppleEventID = 'oitm';
+const AEKeyword DataItemTitle = 'titl';
+const AEKeyword DataItemDescription = 'desc';
+const AEKeyword DataItemSummary = 'summ';
+const AEKeyword DataItemLink = 'link';
+const AEKeyword DataItemPermalink = 'plnk';
+const AEKeyword DataItemSubject = 'subj';
+const AEKeyword DataItemCreator = 'crtr';
+const AEKeyword DataItemCommentsURL = 'curl';
+const AEKeyword DataItemGUID = 'guid';
+const AEKeyword DataItemSourceName = 'snam';
+const AEKeyword DataItemSourceHomeURL = 'hurl';
+const AEKeyword DataItemSourceFeedURL = 'furl';
+
+- (OSStatus)send {
+
+	NSAppleEventDescriptor *appleEvent = [NSAppleEventDescriptor appleEventWithEventClass:EditDataItemAppleEventClass eventID:EditDataItemAppleEventID targetDescriptor:self.targetDescriptor returnID:kAutoGenerateReturnID transactionID:kAnyTransactionID];
+
+	[appleEvent setParamDescriptor:[self paramDescriptor] forKeyword:keyDirectObject];
+
+	return AESendMessage((const AppleEvent *)[appleEvent aeDesc], NULL, kAENoReply | kAECanSwitchLayer | kAEAlwaysInteract, kAEDefaultTimeout);
+}
+
+#pragma mark - Private
+
+- (NSAppleEventDescriptor *)paramDescriptor {
+
+	NSAppleEventDescriptor *descriptor = [NSAppleEventDescriptor recordDescriptor];
+
+	[self addToDescriptor:descriptor key:@"title" keyword:DataItemTitle];
+	[self addToDescriptor:descriptor key:@"body" keyword:DataItemDescription];
+	[self addToDescriptor:descriptor key:@"summary" keyword:DataItemSummary];
+	[self addToDescriptor:descriptor key:@"link" keyword:DataItemLink];
+	[self addToDescriptor:descriptor key:@"permalink" keyword:DataItemPermalink];
+	[self addToDescriptor:descriptor key:@"subject" keyword:DataItemSubject];
+	[self addToDescriptor:descriptor key:@"creator" keyword:DataItemCreator];
+	[self addToDescriptor:descriptor key:@"commentsURL" keyword:DataItemCommentsURL];
+	[self addToDescriptor:descriptor key:@"guid" keyword:DataItemGUID];
+	[self addToDescriptor:descriptor key:@"sourceName" keyword:DataItemSourceName];
+	[self addToDescriptor:descriptor key:@"sourceHomeURL" keyword:DataItemSourceHomeURL];
+	[self addToDescriptor:descriptor key:@"sourceFeedURL" keyword:DataItemSourceFeedURL];
+
+	return descriptor;
+}
+
+- (void)addToDescriptor:(NSAppleEventDescriptor *)descriptor key:(NSString *)key keyword:(AEKeyword)keyword {
+
+	NSString *stringValue = (NSString *)[self valueForKey:key];
+	if (!stringValue) {
+		return;
+	}
+
+	NSAppleEventDescriptor *stringDescriptor = [NSAppleEventDescriptor descriptorWithString:stringValue];
+	[descriptor setDescriptor:stringDescriptor forKeyword:keyword];
+}
+
+
+@end