GH-218 Add hasDirtyDocs()

- Use it to determine whether to close the window or not.

NeoVimServer/NeoVimMsgIds.h

@@ -48,6 +48,7 @@ typedef NS_ENUM(NSUInteger, NeoVimAgentMsgId) {
   NeoVimAgentMsgIdDelete,
   NeoVimAgentMsgIdResize,
   NeoVimAgentMsgIdRedraw,
+  NeoVimAgentMsgIdDirtyDocs,
   
 #ifdef DEBUG
   NeoVimAgentDebug1,

NeoVimServer/NeoVimServer.m

@@ -24,17 +24,22 @@ data_to_array(NSInteger)
 
 @interface NeoVimServer ()
 
-- (void)handleMessageWithId:(SInt32)msgid data:(NSData *)data;
+- (NSData *)handleMessageWithId:(SInt32)msgid data:(NSData *)data;
 
 @end
 
 static CFDataRef local_server_callback(CFMessagePortRef local, SInt32 msgid, CFDataRef data, void *info) {
   @autoreleasepool {
     NeoVimServer *neoVimServer = (__bridge NeoVimServer *) info;
-    [neoVimServer handleMessageWithId:msgid data:(__bridge NSData *) data];
+    NSData *responseData = [neoVimServer handleMessageWithId:msgid data:(__bridge NSData *) data];
-  }
 
-  return NULL;
+    if (responseData == nil) {
+      return NULL;
+    }
+
+    log4Debug("server returning data: %@", responseData);
+    return CFDataCreateCopy(kCFAllocatorDefault, (__bridge CFDataRef) responseData);
+  }
 }
 
 
@@ -129,45 +134,50 @@ static CFDataRef local_server_callback(CFMessagePortRef local, SInt32 msgid, CFD
   [self sendMessageWithId:NeoVimServerMsgIdServerReady data:nil];
 }
 
-- (void)handleMessageWithId:(SInt32)msgid data:(NSData *)data {
+- (NSData *)handleMessageWithId:(SInt32)msgid data:(NSData *)data {
   switch (msgid) {
 
     case NeoVimAgentMsgIdAgentReady:
       server_start_neovim();
-      return;
+      return nil;
 
     case NeoVimAgentMsgIdInput: {
       NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
       server_vim_input(string);
 
-      return;
+      return nil;
     }
 
     case NeoVimAgentMsgIdInputMarked: {
       NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
       server_vim_input_marked_text(string);
 
-      return;
+      return nil;
     }
 
     case NeoVimAgentMsgIdDelete: {
       NSInteger *values = data_to_NSInteger_array(data, 1);
       server_delete(values[0]);
-      return;
+      return nil;
     }
 
     case NeoVimAgentMsgIdResize: {
       int *values = data_to_int_array(data, 2);
       server_resize(values[0], values[1]);
-      return;
+      return nil;
     }
 
     case NeoVimAgentMsgIdRedraw:
       server_redraw();
-      return;
+      return nil;
+
+    case NeoVimAgentMsgIdDirtyDocs: {
+      bool dirty = server_has_dirty_docs();
+      return [NSData dataWithBytes:&dirty length:sizeof(bool)];
+    }
 
     default:
-      return;
+      return nil;
   }
 }
 

NeoVimServer/server_globals.h

@@ -17,3 +17,4 @@ extern void server_redraw();
 extern void server_resize(int width, int height);
 extern void server_vim_input_marked_text(NSString *markedText);
 extern void server_insert_marked_text(NSString *markedText);
+extern bool server_has_dirty_docs();

NeoVimServer/server_ui.m

@@ -20,7 +20,6 @@
 #import <nvim/ui_bridge.h>
 #import <nvim/event/signal.h>
 #import <nvim/main.h>
-#import <nvim/cursor.h>
 #import <nvim/screen.h>
 
 
@@ -614,3 +613,13 @@ void server_insert_marked_text(NSString *markedText) {
 
   loop_schedule(&main_loop, event_create(1, neovim_input, 1, [_marked_text retain])); // release in neovim_input
 }
+
+bool server_has_dirty_docs() {
+  FOR_ALL_BUFFERS(buffer) {
+    if (buffer->b_changed) {
+      return true;
+    }
+  }
+
+  return false;
+}

SwiftNeoVim/NeoVimAgent.h

@@ -25,6 +25,8 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)forceRedraw;
 - (void)resizeToWidth:(int)width height:(int)height;
 
+- (bool)hasDirtyDocs;
+
 @end
 
 NS_ASSUME_NONNULL_END

SwiftNeoVim/NeoVimAgent.m

@@ -21,6 +21,7 @@ static type *data_to_ ## type ## _array(NSData *data, NSUInteger count) { \
 }
 
 data_to_array(int)
+data_to_array(bool)
 data_to_array(CellAttributes)
 
 @interface NeoVimAgent ()
@@ -45,7 +46,7 @@ static CFDataRef local_server_callback(CFMessagePortRef local, SInt32 msgid, CFD
 
   CFMessagePortRef _localServerPort;
   NSThread *_localServerThread;
-  
+
   CFRunLoopRef _runLoop;
 
   NSTask *_neoVimServerTask;
@@ -114,6 +115,17 @@ static CFDataRef local_server_callback(CFMessagePortRef local, SInt32 msgid, CFD
   [self sendMessageWithId:NeoVimAgentMsgIdResize data:data];
 }
 
+- (bool)hasDirtyDocs {
+  NSData *responseData = [self sendMessageWithId:NeoVimAgentMsgIdDirtyDocs data:nil];
+  if (responseData == NULL) {
+    NSLog(@"WARNING: agent got response data null");
+    return false;
+  }
+  
+  bool *values = data_to_bool_array(responseData, 1);
+  return values[0];
+}
+
 - (void)runLocalServer {
   @autoreleasepool {
     CFMessagePortContext localContext = {
@@ -152,21 +164,34 @@ static CFDataRef local_server_callback(CFMessagePortRef local, SInt32 msgid, CFD
   [self sendMessageWithId:NeoVimAgentMsgIdAgentReady data:nil];
 }
 
-- (void)sendMessageWithId:(NeoVimAgentMsgId)msgid data:(NSData *)data {
+- (NSData *)sendMessageWithId:(NeoVimAgentMsgId)msgid data:(NSData *)data {
   if (_remoteServerPort == NULL) {
     log4Warn("Remote server is null: The msg (%lu:%@) could not be sent.", (unsigned long) msgid, data);
-    return;
+    return nil;
+  }
+
+  CFDataRef responseData = NULL;
+  CFStringRef replyMode = NULL;
+
+  // We only expect reply from NeoVimAgentMsgIdDirtyDocs
+  if (msgid == NeoVimAgentMsgIdDirtyDocs) {
+    replyMode = kCFRunLoopDefaultMode;
   }
 
   SInt32 responseCode = CFMessagePortSendRequest(
-      _remoteServerPort, msgid, (__bridge CFDataRef) data, qTimeout, qTimeout, NULL, NULL
+      _remoteServerPort, msgid, (__bridge CFDataRef) data, qTimeout, qTimeout, replyMode, &responseData
   );
 
-  if (responseCode == kCFMessagePortSuccess) {
+  if (responseCode != kCFMessagePortSuccess) {
-    return;
+    log4Warn("The msg (%lu:%@) could not be sent: %d", (unsigned long) msgid, data, responseCode);
+    return nil;
   }
 
-  log4Warn("The msg (%lu:%@) could not be sent: %d", (unsigned long) msgid, data, responseCode);
+  if (responseData == NULL) {
+    return nil;
+  }
+
+  return [NSData dataWithData:(__bridge NSData *) responseData];
 }
 
 - (NSString *)neoVimServerExecutablePath {

SwiftNeoVim/NeoVimView.swift

@@ -180,6 +180,10 @@ public class NeoVimView: NSView {
     self.drawCursor(self.grid.background)
   }
 
+  public func hasDirtyDocs() -> Bool {
+    return self.agent.hasDirtyDocs()
+  }
+
   private func drawCursor(background: UInt32) {
     // FIXME: for now do some rudimentary cursor drawing
     let cursorPosition = self.grid.putPosition

VimR/MainWindowController.swift

@@ -24,18 +24,25 @@ class MainWindowController: NSWindowController, NSWindowDelegate, NeoVimViewDele
     self.window?.makeFirstResponder(self.neoVimView)
   }
 
+  // MARK: - NSWindowDelegate
   func windowWillClose(notification: NSNotification) {
     self.mainWindowManager?.closeMainWindow(self)
   }
-  
+
+  func windowShouldClose(sender: AnyObject) -> Bool {
+    return !self.neoVimView.hasDirtyDocs()
+  }
+
+  // MARK: - NeoVimViewDelegate
   func setNeoVimTitle(title: String) {
     NSLog("\(#function): \(title)")
   }
   
   func neoVimStopped() {
-    self.window?.performClose(self)
+    self.close()
   }
-  
+
+  // MARK: - Private
   private func addViews() {
     self.window?.contentView?.addSubview(self.neoVimView)
     self.neoVimView.autoPinEdgesToSuperviewEdges()