Open and save dialogs track the Vim pwd

[MacVim.git] / src / MacVim / MMBackend.m

/* vi:set ts=8 sts=4 sw=4 ft=objc:
 *
 * VIM - Vi IMproved            by Bram Moolenaar
 *                              MacVim GUI port by Bjorn Winckler
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */
/*
 * MMBackend
 *
 * MMBackend communicates with the frontend (MacVim).  It maintains a queue of
 * output which is flushed to the frontend under controlled circumstances (so
 * as to maintain a steady framerate).  Input from the frontend is also handled
 * here.
 *
 * The frontend communicates with the backend via the MMBackendProtocol.  In
 * particular, input is sent to the backend via processInput:data: and Vim
 * state can be queried from the frontend with evaluateExpression:.
 *
 * It is very important to realize that all state is held by the backend, the
 * frontend must either ask for state [MMBackend evaluateExpression:] or wait
 * for the backend to update [MMVimController processCommandQueue:].
 *
 * The client/server functionality of Vim is handled by the backend.  It sets
 * up a named NSConnection to which other Vim processes can connect.
 */

#import "MMBackend.h"



// NOTE: Colors in MMBackend are stored as unsigned ints on the form 0xaarrggbb
// whereas colors in Vim are int without the alpha component.  Also note that
// 'transp' is assumed to be a value between 0 and 100.
#define MM_COLOR(col) ((unsigned)( ((col)&0xffffff) | 0xff000000 ))
#define MM_COLOR_WITH_TRANSP(col,transp) \
    ((unsigned)( ((col)&0xffffff) \
        | ((((unsigned)((((100-(transp))*255)/100)+.5f))&0xff)<<24) ))


// This constant controls how often the command queue may be flushed.  If it is
// too small the app might feel unresponsive; if it is too large there might be
// long periods without the screen updating (e.g. when sourcing a large session
// file).  (The unit is seconds.)
static float MMFlushTimeoutInterval = 0.1f;
static int MMFlushQueueLenHint = 80*40;

static unsigned MMServerMax = 1000;

// TODO: Move to separate file.
static int eventModifierFlagsToVimModMask(int modifierFlags);
static int vimModMaskToEventModifierFlags(int mods);
static int eventModifierFlagsToVimMouseModMask(int modifierFlags);
static int eventButtonNumberToVimMouseButton(int buttonNumber);
static int specialKeyToNSKey(int key);

enum {
    MMBlinkStateNone = 0,
    MMBlinkStateOn,
    MMBlinkStateOff
};

static NSString *MMSymlinkWarningString =
    @"\n\n\tMost likely this is because you have symlinked directly to\n"
     "\tthe Vim binary, which Cocoa does not allow.  Please use an\n"
     "\talias or the mvim shell script instead.  If you have not used\n"
     "\ta symlink, then your MacVim.app bundle is incomplete.\n\n";



@interface NSString (MMServerNameCompare)
- (NSComparisonResult)serverNameCompare:(NSString *)string;
@end



@interface MMBackend (Private)
- (void)queueVimStateMessage;
- (void)processInputQueue;
- (void)handleInputEvent:(int)msgid data:(NSData *)data;
+ (NSDictionary *)specialKeys;
- (void)handleInsertText:(NSData *)data;
- (void)handleKeyDown:(NSString *)key modifiers:(int)mods;
- (void)queueMessage:(int)msgid data:(NSData *)data;
- (void)connectionDidDie:(NSNotification *)notification;
- (void)blinkTimerFired:(NSTimer *)timer;
- (void)focusChange:(BOOL)on;
- (void)handleToggleToolbar;
- (void)handleScrollbarEvent:(NSData *)data;
- (void)handleSetFont:(NSData *)data;
- (void)handleDropFiles:(NSData *)data;
- (void)handleDropString:(NSData *)data;
- (void)handleOdbEdit:(NSData *)data;
- (void)handleXcodeMod:(NSData *)data;
- (BOOL)checkForModifiedBuffers;
- (void)addInput:(NSString *)input;
@end



@interface MMBackend (ClientServer)
- (NSString *)connectionNameFromServerName:(NSString *)name;
- (NSConnection *)connectionForServerName:(NSString *)name;
- (NSConnection *)connectionForServerPort:(int)port;
- (void)serverConnectionDidDie:(NSNotification *)notification;
- (void)addClient:(NSDistantObject *)client;
- (NSString *)alternateServerNameForName:(NSString *)name;
@end



@implementation MMBackend

+ (MMBackend *)sharedInstance
{
    static MMBackend *singleton = nil;
    return singleton ? singleton : (singleton = [MMBackend new]);
}

- (id)init
{
    self = [super init];
    if (!self) return nil;

    fontContainerRef = loadFonts();

    outputQueue = [[NSMutableArray alloc] init];
    inputQueue = [[NSMutableArray alloc] init];
    drawData = [[NSMutableData alloc] initWithCapacity:1024];
    connectionNameDict = [[NSMutableDictionary alloc] init];
    clientProxyDict = [[NSMutableDictionary alloc] init];
    serverReplyDict = [[NSMutableDictionary alloc] init];

    NSBundle *mainBundle = [NSBundle mainBundle];
    NSString *path = [mainBundle pathForResource:@"Colors" ofType:@"plist"];
    if (path)
        colorDict = [[NSDictionary dictionaryWithContentsOfFile:path] retain];

    path = [mainBundle pathForResource:@"SystemColors" ofType:@"plist"];
    if (path)
        sysColorDict = [[NSDictionary dictionaryWithContentsOfFile:path]
            retain];

    path = [mainBundle pathForResource:@"Actions" ofType:@"plist"];
    if (path)
        actionDict = [[NSDictionary dictionaryWithContentsOfFile:path] retain];

    if (!(colorDict && sysColorDict && actionDict))
        NSLog(@"ERROR: Failed to load dictionaries.%@",
                MMSymlinkWarningString);

    return self;
}

- (void)dealloc
{
    //NSLog(@"%@ %s", [self className], _cmd);
    [[NSNotificationCenter defaultCenter] removeObserver:self];

    [oldWideFont release];  oldWideFont = nil;
    [blinkTimer release];  blinkTimer = nil;
    [alternateServerName release];  alternateServerName = nil;
    [serverReplyDict release];  serverReplyDict = nil;
    [clientProxyDict release];  clientProxyDict = nil;
    [connectionNameDict release];  connectionNameDict = nil;
    [inputQueue release];  inputQueue = nil;
    [outputQueue release];  outputQueue = nil;
    [drawData release];  drawData = nil;
    [frontendProxy release];  frontendProxy = nil;
    [connection release];  connection = nil;
    [actionDict release];  actionDict = nil;
    [sysColorDict release];  sysColorDict = nil;
    [colorDict release];  colorDict = nil;

    [super dealloc];
}

- (void)setBackgroundColor:(int)color
{
    backgroundColor = MM_COLOR_WITH_TRANSP(color,p_transp);
}

- (void)setForegroundColor:(int)color
{
    foregroundColor = MM_COLOR(color);
}

- (void)setSpecialColor:(int)color
{
    specialColor = MM_COLOR(color);
}

- (void)setDefaultColorsBackground:(int)bg foreground:(int)fg
{
    defaultBackgroundColor = MM_COLOR_WITH_TRANSP(bg,p_transp);
    defaultForegroundColor = MM_COLOR(fg);

    NSMutableData *data = [NSMutableData data];

    [data appendBytes:&defaultBackgroundColor length:sizeof(unsigned)];
    [data appendBytes:&defaultForegroundColor length:sizeof(unsigned)];

    [self queueMessage:SetDefaultColorsMsgID data:data];
}

- (NSConnection *)connection
{
    if (!connection) {
        // NOTE!  If the name of the connection changes here it must also be
        // updated in MMAppController.m.
        NSString *name = [NSString stringWithFormat:@"%@-connection",
               [[NSBundle mainBundle] bundleIdentifier]];

        connection = [NSConnection connectionWithRegisteredName:name host:nil];
        [connection retain];
    }

    // NOTE: 'connection' may be nil here.
    return connection;
}

- (NSDictionary *)actionDict
{
    return actionDict;
}

- (BOOL)checkin
{
    if (![self connection]) {
        NSBundle *mainBundle = [NSBundle mainBundle];
#if 0
        OSStatus status;
        FSRef ref;

        // Launch MacVim using Launch Services (NSWorkspace would be nicer, but
        // the API to pass Apple Event parameters is broken on 10.4).
        NSString *path = [mainBundle bundlePath];
        status = FSPathMakeRef((const UInt8 *)[path UTF8String], &ref, NULL);
        if (noErr == status) {
            // Pass parameter to the 'Open' Apple Event that tells MacVim not
            // to open an untitled window.
            NSAppleEventDescriptor *desc =
                    [NSAppleEventDescriptor recordDescriptor];
            [desc setParamDescriptor:
                    [NSAppleEventDescriptor descriptorWithBoolean:NO]
                          forKeyword:keyMMUntitledWindow];

            LSLaunchFSRefSpec spec = { &ref, 0, NULL, [desc aeDesc],
                    kLSLaunchDefaults, NULL };
            status = LSOpenFromRefSpec(&spec, NULL);
        }

        if (noErr != status) {
        NSLog(@"ERROR: Failed to launch MacVim (path=%@).%@",
                path, MMSymlinkWarningString);
            return NO;
        }
#else
        // Launch MacVim using NSTask.  For some reason the above code using
        // Launch Services sometimes fails on LSOpenFromRefSpec() (when it
        // fails, the dock icon starts bouncing and never stops).  It seems
        // like rebuilding the Launch Services database takes care of this
        // problem, but the NSTask way seems more stable so stick with it.
        //
        // NOTE!  Using NSTask to launch the GUI has the negative side-effect
        // that the GUI won't be activated (or raised) so there is a hack in
        // MMAppController which raises the app when a new window is opened.
        NSMutableArray *args = [NSMutableArray arrayWithObjects:
            [NSString stringWithFormat:@"-%@", MMNoWindowKey], @"yes", nil];
        NSString *exeName = [[mainBundle infoDictionary]
                objectForKey:@"CFBundleExecutable"];
        NSString *path = [mainBundle pathForAuxiliaryExecutable:exeName];
        if (!path) {
            NSLog(@"ERROR: Could not find MacVim executable in bundle.%@",
                    MMSymlinkWarningString);
            return NO;
        }

        [NSTask launchedTaskWithLaunchPath:path arguments:args];
#endif

        // HACK!  Poll the mach bootstrap server until it returns a valid
        // connection to detect that MacVim has finished launching.  Also set a
        // time-out date so that we don't get stuck doing this forever.
        NSDate *timeOutDate = [NSDate dateWithTimeIntervalSinceNow:10];
        while (![self connection] &&
                NSOrderedDescending == [timeOutDate compare:[NSDate date]])
            [[NSRunLoop currentRunLoop]
                    runMode:NSDefaultRunLoopMode
                 beforeDate:[NSDate dateWithTimeIntervalSinceNow:1]];

        // NOTE: [self connection] will set 'connection' as a side-effect.
        if (!connection) {
            NSLog(@"WARNING: Timed-out waiting for GUI to launch.");
            return NO;
        }
    }

    BOOL ok = NO;
    @try {
        [[NSNotificationCenter defaultCenter] addObserver:self
                selector:@selector(connectionDidDie:)
                    name:NSConnectionDidDieNotification object:connection];

        id proxy = [connection rootProxy];
        [proxy setProtocolForProxy:@protocol(MMAppProtocol)];

        int pid = [[NSProcessInfo processInfo] processIdentifier];

        frontendProxy = [proxy connectBackend:self pid:pid];
        if (frontendProxy) {
            [frontendProxy retain];
            [frontendProxy setProtocolForProxy:@protocol(MMAppProtocol)];
            ok = YES;
        }
    }
    @catch (NSException *e) {
        NSLog(@"Exception caught when trying to connect backend: \"%@\"", e);
    }

    return ok;
}

- (BOOL)openVimWindow
{
    [self queueMessage:OpenVimWindowMsgID data:nil];
    return YES;
}

- (void)clearAll
{
    int type = ClearAllDrawType;

    // Any draw commands in queue are effectively obsolete since this clearAll
    // will negate any effect they have, therefore we may as well clear the
    // draw queue.
    [drawData setLength:0];

    [drawData appendBytes:&type length:sizeof(int)];
}

- (void)clearBlockFromRow:(int)row1 column:(int)col1
                    toRow:(int)row2 column:(int)col2
{
    int type = ClearBlockDrawType;

    [drawData appendBytes:&type length:sizeof(int)];

    [drawData appendBytes:&defaultBackgroundColor length:sizeof(unsigned)];
    [drawData appendBytes:&row1 length:sizeof(int)];
    [drawData appendBytes:&col1 length:sizeof(int)];
    [drawData appendBytes:&row2 length:sizeof(int)];
    [drawData appendBytes:&col2 length:sizeof(int)];
}

- (void)deleteLinesFromRow:(int)row count:(int)count
              scrollBottom:(int)bottom left:(int)left right:(int)right
{
    int type = DeleteLinesDrawType;

    [drawData appendBytes:&type length:sizeof(int)];

    [drawData appendBytes:&defaultBackgroundColor length:sizeof(unsigned)];
    [drawData appendBytes:&row length:sizeof(int)];
    [drawData appendBytes:&count length:sizeof(int)];
    [drawData appendBytes:&bottom length:sizeof(int)];
    [drawData appendBytes:&left length:sizeof(int)];
    [drawData appendBytes:&right length:sizeof(int)];
}

- (void)drawString:(char*)s length:(int)len row:(int)row column:(int)col
             cells:(int)cells flags:(int)flags
{
    if (len <= 0 || cells <= 0) return;

    int type = DrawStringDrawType;

    [drawData appendBytes:&type length:sizeof(int)];

    [drawData appendBytes:&backgroundColor length:sizeof(unsigned)];
    [drawData appendBytes:&foregroundColor length:sizeof(unsigned)];
    [drawData appendBytes:&specialColor length:sizeof(unsigned)];
    [drawData appendBytes:&row length:sizeof(int)];
    [drawData appendBytes:&col length:sizeof(int)];
    [drawData appendBytes:&cells length:sizeof(int)];
    [drawData appendBytes:&flags length:sizeof(int)];
    [drawData appendBytes:&len length:sizeof(int)];
    [drawData appendBytes:s length:len];
}

- (void)insertLinesFromRow:(int)row count:(int)count
              scrollBottom:(int)bottom left:(int)left right:(int)right
{
    int type = InsertLinesDrawType;

    [drawData appendBytes:&type length:sizeof(int)];

    [drawData appendBytes:&defaultBackgroundColor length:sizeof(unsigned)];
    [drawData appendBytes:&row length:sizeof(int)];
    [drawData appendBytes:&count length:sizeof(int)];
    [drawData appendBytes:&bottom length:sizeof(int)];
    [drawData appendBytes:&left length:sizeof(int)];
    [drawData appendBytes:&right length:sizeof(int)];
}

- (void)drawCursorAtRow:(int)row column:(int)col shape:(int)shape
               fraction:(int)percent color:(int)color
{
    int type = DrawCursorDrawType;
    unsigned uc = MM_COLOR(color);

    [drawData appendBytes:&type length:sizeof(int)];

    [drawData appendBytes:&uc length:sizeof(unsigned)];
    [drawData appendBytes:&row length:sizeof(int)];
    [drawData appendBytes:&col length:sizeof(int)];
    [drawData appendBytes:&shape length:sizeof(int)];
    [drawData appendBytes:&percent length:sizeof(int)];
}

- (void)update
{
    // Tend to the run loop, returning immediately if there are no events
    // waiting.
    [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
                             beforeDate:[NSDate distantPast]];

#if 0
    // Keyboard and mouse input is handled directly, other input is queued and
    // processed here.  This call may enter a blocking loop.
    if ([inputQueue count] > 0)
        [self processInputQueue];
#endif
}

- (void)flushQueue:(BOOL)force
{
    // NOTE! This method gets called a lot; if we were to flush every time it
    // got called MacVim would feel unresponsive.  So there is a time out which
    // ensures that the queue isn't flushed too often.
    if (exiting ||
            (!force && lastFlushDate &&
             -[lastFlushDate timeIntervalSinceNow] < MMFlushTimeoutInterval &&
             [drawData length] < MMFlushQueueLenHint))
        return;

    if ([drawData length] > 0) {
        // HACK!  Detect changes to 'guifontwide'.
        if (gui.wide_font != (GuiFont)oldWideFont) {
            [oldWideFont release];
            oldWideFont = [(NSFont*)gui.wide_font retain];
            [self setWideFont:oldWideFont];
        }

        int type = SetCursorPosDrawType;
        [drawData appendBytes:&type length:sizeof(type)];
        [drawData appendBytes:&gui.row length:sizeof(gui.row)];
        [drawData appendBytes:&gui.col length:sizeof(gui.col)];

        [self queueMessage:BatchDrawMsgID data:[drawData copy]];
        [drawData setLength:0];
    }

    if ([outputQueue count] > 0 || force) {
        // When 'force' is set we always update the Vim state to ensure that
        // MacVim has a copy of the latest state (since 'force' is typically
        // set just before Vim takes a nap whilst waiting for input).
        [self queueVimStateMessage];

        @try {
            [frontendProxy processCommandQueue:outputQueue];
        }
        @catch (NSException *e) {
            NSLog(@"Exception caught when processing command queue: \"%@\"", e);
        }

        [outputQueue removeAllObjects];

        [lastFlushDate release];
        lastFlushDate = [[NSDate date] retain];
    }
}

- (BOOL)waitForInput:(int)milliseconds
{
    //NSLog(@"|ENTER| %s%d",  _cmd, milliseconds);

    // Only start the run loop if the input queue is empty, otherwise process
    // the input first so that the input on queue isn't delayed.
    if ([inputQueue count]) {
        inputReceived = YES;
    } else {
        NSDate *date = milliseconds > 0 ?
                [NSDate dateWithTimeIntervalSinceNow:.001*milliseconds] : 
                [NSDate distantFuture];

        [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
                                 beforeDate:date];
    }

    // I know of no way to figure out if the run loop exited because input was
    // found or because of a time out, so I need to manually indicate when
    // input was received in processInput:data: and then reset it every time
    // here.
    BOOL yn = inputReceived;
    inputReceived = NO;

    // Keyboard and mouse input is handled directly, other input is queued and
    // processed here.  This call may enter a blocking loop.
    if ([inputQueue count] > 0)
        [self processInputQueue];

    //NSLog(@"|LEAVE| %s input=%d", _cmd, yn);
    return yn;
}

- (void)exit
{
#ifdef MAC_CLIENTSERVER
    // The default connection is used for the client/server code.
    [[NSConnection defaultConnection] setRootObject:nil];
    [[NSConnection defaultConnection] invalidate];
#endif

    // By invalidating the NSConnection the MMWindowController immediately
    // finds out that the connection is down and as a result
    // [MMWindowController connectionDidDie:] is invoked.
    //NSLog(@"%@ %s", [self className], _cmd);
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [connection invalidate];

    if (fontContainerRef) {
        ATSFontDeactivate(fontContainerRef, NULL, kATSOptionFlagsDefault);
        fontContainerRef = 0;
    }

}

- (void)selectTab:(int)index
{
    //NSLog(@"%s%d", _cmd, index);

    index -= 1;
    NSData *data = [NSData dataWithBytes:&index length:sizeof(int)];
    [self queueMessage:SelectTabMsgID data:data];
}

- (void)updateTabBar
{
    //NSLog(@"%s", _cmd);

    NSMutableData *data = [NSMutableData data];

    int idx = tabpage_index(curtab) - 1;
    [data appendBytes:&idx length:sizeof(int)];

    tabpage_T *tp;
    for (tp = first_tabpage; tp != NULL; tp = tp->tp_next) {
        // This function puts the label of the tab in the global 'NameBuff'.
        get_tabline_label(tp, FALSE);
        char_u *s = NameBuff;
        int len = STRLEN(s);
        if (len <= 0) continue;

#ifdef FEAT_MBYTE
        s = CONVERT_TO_UTF8(s);
#endif

        // Count the number of windows in the tabpage.
        //win_T *wp = tp->tp_firstwin;
        //int wincount;
        //for (wincount = 0; wp != NULL; wp = wp->w_next, ++wincount);

        //[data appendBytes:&wincount length:sizeof(int)];
        [data appendBytes:&len length:sizeof(int)];
        [data appendBytes:s length:len];

#ifdef FEAT_MBYTE
        CONVERT_TO_UTF8_FREE(s);
#endif
    }

    [self queueMessage:UpdateTabBarMsgID data:data];
}

- (BOOL)tabBarVisible
{
    return tabBarVisible;
}

- (void)showTabBar:(BOOL)enable
{
    tabBarVisible = enable;

    int msgid = enable ? ShowTabBarMsgID : HideTabBarMsgID;
    [self queueMessage:msgid data:nil];
}

- (void)setRows:(int)rows columns:(int)cols
{
    //NSLog(@"[VimTask] setRows:%d columns:%d", rows, cols);

    int dim[] = { rows, cols };
    NSData *data = [NSData dataWithBytes:&dim length:2*sizeof(int)];

    [self queueMessage:SetTextDimensionsMsgID data:data];
}

- (void)setWindowTitle:(char *)title
{
    NSMutableData *data = [NSMutableData data];
    int len = strlen(title);
    if (len <= 0) return;

    [data appendBytes:&len length:sizeof(int)];
    [data appendBytes:title length:len];

    [self queueMessage:SetWindowTitleMsgID data:data];
}

- (char *)browseForFileInDirectory:(char *)dir title:(char *)title
                            saving:(int)saving
{
    //NSLog(@"browseForFileInDirectory:%s title:%s saving:%d", dir, title,
    //        saving);

    char_u *s = NULL;
    NSString *ds = dir ? [NSString stringWithUTF8String:dir] : nil;
    NSString *ts = title ? [NSString stringWithUTF8String:title] : nil;
    @try {
        [frontendProxy showSavePanelForDirectory:ds title:ts saving:saving];

        // Wait until a reply is sent from MMVimController.
        [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
                                 beforeDate:[NSDate distantFuture]];

        if (dialogReturn && [dialogReturn isKindOfClass:[NSString class]]) {
            char_u *ret = (char_u*)[dialogReturn UTF8String];
#ifdef FEAT_MBYTE
            ret = CONVERT_FROM_UTF8(ret);
#endif
            s = vim_strsave(ret);
#ifdef FEAT_MBYTE
            CONVERT_FROM_UTF8_FREE(ret);
#endif
        }

        [dialogReturn release];  dialogReturn = nil;
    }
    @catch (NSException *e) {
        NSLog(@"Exception caught when showing save panel: \"%@\"", e);
    }

    return (char *)s;
}

- (oneway void)setDialogReturn:(in bycopy id)obj
{
    // NOTE: This is called by
    //   - [MMVimController panelDidEnd:::], and
    //   - [MMVimController alertDidEnd:::],
    // to indicate that a save/open panel or alert has finished.

    if (obj != dialogReturn) {
        [dialogReturn release];
        dialogReturn = [obj retain];
    }
}

- (int)presentDialogWithType:(int)type title:(char *)title message:(char *)msg
                     buttons:(char *)btns textField:(char *)txtfield
{
    int retval = 0;
    NSString *message = nil, *text = nil, *textFieldString = nil;
    NSArray *buttons = nil;
    int style = NSInformationalAlertStyle;

    if (VIM_WARNING == type) style = NSWarningAlertStyle;
    else if (VIM_ERROR == type) style = NSCriticalAlertStyle;

    if (btns) {
        NSString *btnString = [NSString stringWithUTF8String:btns];
        buttons = [btnString componentsSeparatedByString:@"\n"];
    }
    if (title)
        message = [NSString stringWithUTF8String:title];
    if (msg) {
        text = [NSString stringWithUTF8String:msg];
        if (!message) {
            // HACK! If there is a '\n\n' or '\n' sequence in the message, then
            // make the part up to there into the title.  We only do this
            // because Vim has lots of dialogs without a title and they look
            // ugly that way.
            // TODO: Fix the actual dialog texts.
            NSRange eolRange = [text rangeOfString:@"\n\n"];
            if (NSNotFound == eolRange.location)
                eolRange = [text rangeOfString:@"\n"];
            if (NSNotFound != eolRange.location) {
                message = [text substringToIndex:eolRange.location];
                text = [text substringFromIndex:NSMaxRange(eolRange)];
            }
        }
    }
    if (txtfield)
        textFieldString = [NSString stringWithUTF8String:txtfield];

    @try {
        [frontendProxy presentDialogWithStyle:style message:message
                              informativeText:text buttonTitles:buttons
                              textFieldString:textFieldString];

        // Wait until a reply is sent from MMVimController.
        [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
                                 beforeDate:[NSDate distantFuture]];

        if (dialogReturn && [dialogReturn isKindOfClass:[NSArray class]]
                && [dialogReturn count]) {
            retval = [[dialogReturn objectAtIndex:0] intValue];
            if (txtfield && [dialogReturn count] > 1) {
                NSString *retString = [dialogReturn objectAtIndex:1];
                char_u *ret = (char_u*)[retString UTF8String];
#ifdef FEAT_MBYTE
                ret = CONVERT_FROM_UTF8(ret);
#endif
                vim_strncpy((char_u*)txtfield, ret, IOSIZE - 1);
#ifdef FEAT_MBYTE
                CONVERT_FROM_UTF8_FREE(ret);
#endif
            }
        }

        [dialogReturn release]; dialogReturn = nil;
    }
    @catch (NSException *e) {
        NSLog(@"Exception caught while showing alert dialog: \"%@\"", e);
    }

    return retval;
}

- (void)addMenuWithTag:(int)tag parent:(int)parentTag name:(char *)name
               atIndex:(int)index
{
    //NSLog(@"addMenuWithTag:%d parent:%d name:%s atIndex:%d", tag, parentTag,
    //        name, index);

    int namelen = name ? strlen(name) : 0;
    NSMutableData *data = [NSMutableData data];

    [data appendBytes:&tag length:sizeof(int)];
    [data appendBytes:&parentTag length:sizeof(int)];
    [data appendBytes:&namelen length:sizeof(int)];
    if (namelen > 0) [data appendBytes:name length:namelen];
    [data appendBytes:&index length:sizeof(int)];

    [self queueMessage:AddMenuMsgID data:data];
}

- (void)addMenuItemWithTag:(int)tag parent:(int)parentTag name:(char *)name
                       tip:(char *)tip icon:(char *)icon
             keyEquivalent:(int)key modifiers:(int)mods
                    action:(char *)action isAlternate:(int)isAlt
                   atIndex:(int)index
{
    //NSLog(@"addMenuItemWithTag:%d parent:%d name:%s tip:%s atIndex:%d", tag,
    //        parentTag, name, tip, index);

    int namelen = name ? strlen(name) : 0;
    int tiplen = tip ? strlen(tip) : 0;
    int iconlen = icon ? strlen(icon) : 0;
    int eventFlags = vimModMaskToEventModifierFlags(mods);
    int actionlen = action ? strlen(action) : 0;
    NSMutableData *data = [NSMutableData data];

    key = specialKeyToNSKey(key);

    [data appendBytes:&tag length:sizeof(int)];
    [data appendBytes:&parentTag length:sizeof(int)];
    [data appendBytes:&namelen length:sizeof(int)];
    if (namelen > 0) [data appendBytes:name length:namelen];
    [data appendBytes:&tiplen length:sizeof(int)];
    if (tiplen > 0) [data appendBytes:tip length:tiplen];
    [data appendBytes:&iconlen length:sizeof(int)];
    if (iconlen > 0) [data appendBytes:icon length:iconlen];
    [data appendBytes:&actionlen length:sizeof(int)];
    if (actionlen > 0) [data appendBytes:action length:actionlen];
    [data appendBytes:&index length:sizeof(int)];
    [data appendBytes:&key length:sizeof(int)];
    [data appendBytes:&eventFlags length:sizeof(int)];
    [data appendBytes:&isAlt length:sizeof(int)];

    [self queueMessage:AddMenuItemMsgID data:data];
}

- (void)removeMenuItemWithTag:(int)tag
{
    NSMutableData *data = [NSMutableData data];
    [data appendBytes:&tag length:sizeof(int)];

    [self queueMessage:RemoveMenuItemMsgID data:data];
}

- (void)enableMenuItemWithTag:(int)tag state:(int)enabled
{
    NSMutableData *data = [NSMutableData data];

    [data appendBytes:&tag length:sizeof(int)];
    [data appendBytes:&enabled length:sizeof(int)];

    [self queueMessage:EnableMenuItemMsgID data:data];
}

- (void)showPopupMenuWithName:(char *)name atMouseLocation:(BOOL)mouse
{
    int len = strlen(name);
    int row = -1, col = -1;

    if (len <= 0) return;

    if (!mouse && curwin) {
        row = curwin->w_wrow;
        col = curwin->w_wcol;
    }

    NSMutableData *data = [NSMutableData data];

    [data appendBytes:&row length:sizeof(int)];
    [data appendBytes:&col length:sizeof(int)];
    [data appendBytes:&len length:sizeof(int)];
    [data appendBytes:name length:len];

    [self queueMessage:ShowPopupMenuMsgID data:data];
}

- (void)showToolbar:(int)enable flags:(int)flags
{
    NSMutableData *data = [NSMutableData data];

    [data appendBytes:&enable length:sizeof(int)];
    [data appendBytes:&flags length:sizeof(int)];

    [self queueMessage:ShowToolbarMsgID data:data];
}

- (void)createScrollbarWithIdentifier:(long)ident type:(int)type
{
    NSMutableData *data = [NSMutableData data];

    [data appendBytes:&ident length:sizeof(long)];
    [data appendBytes:&type length:sizeof(int)];

    [self queueMessage:CreateScrollbarMsgID data:data];
}

- (void)destroyScrollbarWithIdentifier:(long)ident
{
    NSMutableData *data = [NSMutableData data];
    [data appendBytes:&ident length:sizeof(long)];

    [self queueMessage:DestroyScrollbarMsgID data:data];
}

- (void)showScrollbarWithIdentifier:(long)ident state:(int)visible
{
    NSMutableData *data = [NSMutableData data];

    [data appendBytes:&ident length:sizeof(long)];
    [data appendBytes:&visible length:sizeof(int)];

    [self queueMessage:ShowScrollbarMsgID data:data];
}

- (void)setScrollbarPosition:(int)pos length:(int)len identifier:(long)ident
{
    NSMutableData *data = [NSMutableData data];

    [data appendBytes:&ident length:sizeof(long)];
    [data appendBytes:&pos length:sizeof(int)];
    [data appendBytes:&len length:sizeof(int)];

    [self queueMessage:SetScrollbarPositionMsgID data:data];
}

- (void)setScrollbarThumbValue:(long)val size:(long)size max:(long)max
                    identifier:(long)ident
{
    float fval = max-size+1 > 0 ? (float)val/(max-size+1) : 0;
    float prop = (float)size/(max+1);
    if (fval < 0) fval = 0;
    else if (fval > 1.0f) fval = 1.0f;
    if (prop < 0) prop = 0;
    else if (prop > 1.0f) prop = 1.0f;

    NSMutableData *data = [NSMutableData data];

    [data appendBytes:&ident length:sizeof(long)];
    [data appendBytes:&fval length:sizeof(float)];
    [data appendBytes:&prop length:sizeof(float)];

    [self queueMessage:SetScrollbarThumbMsgID data:data];
}

- (void)setFont:(NSFont *)font
{
    NSString *fontName = [font displayName];
    float size = [font pointSize];
    int len = [fontName lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
    if (len > 0) {
        NSMutableData *data = [NSMutableData data];

        [data appendBytes:&size length:sizeof(float)];
        [data appendBytes:&len length:sizeof(int)];
        [data appendBytes:[fontName UTF8String] length:len];

        [self queueMessage:SetFontMsgID data:data];
    }
}

- (void)setWideFont:(NSFont *)font
{
    NSString *fontName = [font displayName];
    float size = [font pointSize];
    int len = [fontName lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
    NSMutableData *data = [NSMutableData data];

    [data appendBytes:&size length:sizeof(float)];
    [data appendBytes:&len length:sizeof(int)];
    if (len > 0)
        [data appendBytes:[fontName UTF8String] length:len];

    [self queueMessage:SetWideFontMsgID data:data];
}

- (void)executeActionWithName:(NSString *)name
{
    int len = [name lengthOfBytesUsingEncoding:NSUTF8StringEncoding];

    if (len > 0) {
        NSMutableData *data = [NSMutableData data];

        [data appendBytes:&len length:sizeof(int)];
        [data appendBytes:[name UTF8String] length:len];

        [self queueMessage:ExecuteActionMsgID data:data];
    }
}

- (void)setMouseShape:(int)shape
{
    NSMutableData *data = [NSMutableData data];
    [data appendBytes:&shape length:sizeof(int)];
    [self queueMessage:SetMouseShapeMsgID data:data];
}

- (void)setBlinkWait:(int)wait on:(int)on off:(int)off
{
    // Vim specifies times in milliseconds, whereas Cocoa wants them in
    // seconds.
    blinkWaitInterval = .001f*wait;
    blinkOnInterval = .001f*on;
    blinkOffInterval = .001f*off;
}

- (void)startBlink
{
    if (blinkTimer) {
        [blinkTimer invalidate];
        [blinkTimer release];
        blinkTimer = nil;
    }

    if (blinkWaitInterval > 0 && blinkOnInterval > 0 && blinkOffInterval > 0
            && gui.in_focus) {
        blinkState = MMBlinkStateOn;
        blinkTimer =
            [[NSTimer scheduledTimerWithTimeInterval:blinkWaitInterval
                                              target:self
                                            selector:@selector(blinkTimerFired:)
                                            userInfo:nil repeats:NO] retain];
        gui_update_cursor(TRUE, FALSE);
        [self flushQueue:YES];
    }
}

- (void)stopBlink
{
    if (MMBlinkStateOff == blinkState) {
        gui_update_cursor(TRUE, FALSE);
        [self flushQueue:YES];
    }

    blinkState = MMBlinkStateNone;
}

- (void)adjustLinespace:(int)linespace
{
    NSMutableData *data = [NSMutableData data];
    [data appendBytes:&linespace length:sizeof(int)];
    [self queueMessage:AdjustLinespaceMsgID data:data];
}

- (void)activate
{
    [self queueMessage:ActivateMsgID data:nil];
}

- (void)setPreEditRow:(int)row column:(int)col
{
    NSMutableData *data = [NSMutableData data];
    [data appendBytes:&row length:sizeof(int)];
    [data appendBytes:&col length:sizeof(int)];
    [self queueMessage:SetPreEditPositionMsgID data:data];
}

- (int)lookupColorWithKey:(NSString *)key
{
    if (!(key && [key length] > 0))
        return INVALCOLOR;

    NSString *stripKey = [[[[key lowercaseString]
        stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]
            componentsSeparatedByString:@" "]
               componentsJoinedByString:@""];

    if (stripKey && [stripKey length] > 0) {
        // First of all try to lookup key in the color dictionary; note that
        // all keys in this dictionary are lowercase with no whitespace.
        id obj = [colorDict objectForKey:stripKey];
        if (obj) return [obj intValue];

        // The key was not in the dictionary; is it perhaps of the form
        // #rrggbb?
        if ([stripKey length] > 1 && [stripKey characterAtIndex:0] == '#') {
            NSScanner *scanner = [NSScanner scannerWithString:stripKey];
            [scanner setScanLocation:1];
            unsigned hex = 0;
            if ([scanner scanHexInt:&hex]) {
                return (int)hex;
            }
        }

        // As a last resort, check if it is one of the system defined colors.
        // The keys in this dictionary are also lowercase with no whitespace.
        obj = [sysColorDict objectForKey:stripKey];
        if (obj) {
            NSColor *col = [NSColor performSelector:NSSelectorFromString(obj)];
            if (col) {
                float r, g, b, a;
                col = [col colorUsingColorSpaceName:NSCalibratedRGBColorSpace];
                [col getRed:&r green:&g blue:&b alpha:&a];
                return (((int)(r*255+.5f) & 0xff) << 16)
                     + (((int)(g*255+.5f) & 0xff) << 8)
                     +  ((int)(b*255+.5f) & 0xff);
            }
        }
    }

    //NSLog(@"WARNING: No color with key %@ found.", stripKey);
    return INVALCOLOR;
}

- (BOOL)hasSpecialKeyWithValue:(NSString *)value
{
    NSEnumerator *e = [[MMBackend specialKeys] objectEnumerator];
    id obj;

    while ((obj = [e nextObject])) {
        if ([value isEqual:obj])
            return YES;
    }

    return NO;
}

- (void)enterFullscreen:(int)fuoptions background:(int)bg
{
    NSMutableData *data = [NSMutableData data];
    [data appendBytes:&fuoptions length:sizeof(int)];
    bg = MM_COLOR(bg);
    [data appendBytes:&bg length:sizeof(int)];
    [self queueMessage:EnterFullscreenMsgID data:data];
}

- (void)leaveFullscreen
{
    [self queueMessage:LeaveFullscreenMsgID data:nil];
}

- (void)setAntialias:(BOOL)antialias
{
    int msgid = antialias ? EnableAntialiasMsgID : DisableAntialiasMsgID;

    [self queueMessage:msgid data:nil];
}

- (void)updateModifiedFlag
{
    // Notify MacVim if _any_ buffer has changed from unmodified to modified or
    // vice versa.
    int msgid = [self checkForModifiedBuffers]
            ? BuffersModifiedMsgID : BuffersNotModifiedMsgID;

    [self queueMessage:msgid data:nil];
}

- (oneway void)processInput:(int)msgid data:(in bycopy NSData *)data
{
    // NOTE: This method might get called whenever the run loop is tended to.
    // Normal keyboard and mouse input is added to input buffers, so there is
    // no risk in handling these events directly (they return immediately, and
    // do not call any other Vim functions).  However, other events such
    // as 'VimShouldCloseMsgID' may enter blocking loops that wait for key
    // events which would cause this method to be called recursively.  This
    // in turn leads to various difficulties that we do not want to have to
    // deal with.  To avoid recursive calls here we add all events except
    // keyboard and mouse events to an input queue which is processed whenever
    // gui_mch_update() is called (see processInputQueue).

    //NSLog(@"%s%s", _cmd, MessageStrings[msgid]);

    // Don't flush too soon after receiving input or update speed will suffer.
    [lastFlushDate release];
    lastFlushDate = [[NSDate date] retain];

    // Handle keyboard and mouse input now.  All other events are queued.
    if (InsertTextMsgID == msgid) {
        [self handleInsertText:data];
    } else if (KeyDownMsgID == msgid || CmdKeyMsgID == msgid) {
        if (!data) return;
        const void *bytes = [data bytes];
        int mods = *((int*)bytes);  bytes += sizeof(int);
        int len = *((int*)bytes);  bytes += sizeof(int);
        NSString *key = [[NSString alloc] initWithBytes:bytes length:len
                                              encoding:NSUTF8StringEncoding];
        mods = eventModifierFlagsToVimModMask(mods);

        [self handleKeyDown:key modifiers:mods];

        [key release];
    } else if (ScrollWheelMsgID == msgid) {
        if (!data) return;
        const void *bytes = [data bytes];

        int row = *((int*)bytes);  bytes += sizeof(int);
        int col = *((int*)bytes);  bytes += sizeof(int);
        int flags = *((int*)bytes);  bytes += sizeof(int);
        float dy = *((float*)bytes);  bytes += sizeof(float);

        int button = MOUSE_5;
        if (dy > 0) button = MOUSE_4;

        flags = eventModifierFlagsToVimMouseModMask(flags);

        int numLines = (int)round(dy);
        if (numLines < 0) numLines = -numLines;
        if (numLines == 0) numLines = 1;

#ifdef FEAT_GUI_SCROLL_WHEEL_FORCE
        gui.scroll_wheel_force = numLines;
#endif

        gui_send_mouse_event(button, col, row, NO, flags);
    } else if (MouseDownMsgID == msgid) {
        if (!data) return;
        const void *bytes = [data bytes];

        int row = *((int*)bytes);  bytes += sizeof(int);
        int col = *((int*)bytes);  bytes += sizeof(int);
        int button = *((int*)bytes);  bytes += sizeof(int);
        int flags = *((int*)bytes);  bytes += sizeof(int);
        int count = *((int*)bytes);  bytes += sizeof(int);

        button = eventButtonNumberToVimMouseButton(button);
        if (button >= 0) {
            flags = eventModifierFlagsToVimMouseModMask(flags);
            gui_send_mouse_event(button, col, row, count>1, flags);
        }
    } else if (MouseUpMsgID == msgid) {
        if (!data) return;
        const void *bytes = [data bytes];

        int row = *((int*)bytes);  bytes += sizeof(int);
        int col = *((int*)bytes);  bytes += sizeof(int);
        int flags = *((int*)bytes);  bytes += sizeof(int);

        flags = eventModifierFlagsToVimMouseModMask(flags);

        gui_send_mouse_event(MOUSE_RELEASE, col, row, NO, flags);
    } else if (MouseDraggedMsgID == msgid) {
        if (!data) return;
        const void *bytes = [data bytes];

        int row = *((int*)bytes);  bytes += sizeof(int);
        int col = *((int*)bytes);  bytes += sizeof(int);
        int flags = *((int*)bytes);  bytes += sizeof(int);

        flags = eventModifierFlagsToVimMouseModMask(flags);

        gui_send_mouse_event(MOUSE_DRAG, col, row, NO, flags);
    } else if (MouseMovedMsgID == msgid) {
        const void *bytes = [data bytes];
        int row = *((int*)bytes);  bytes += sizeof(int);
        int col = *((int*)bytes);  bytes += sizeof(int);

        gui_mouse_moved(col, row);
    } else if (AddInputMsgID == msgid) {
        NSString *string = [[NSString alloc] initWithData:data
                encoding:NSUTF8StringEncoding];
        if (string) {
            [self addInput:string];
            [string release];
        }
    } else if (TerminateNowMsgID == msgid) {
        isTerminating = YES;
    } else {
        // Not keyboard or mouse event, queue it and handle later.
        //NSLog(@"Add event %s to input event queue", MessageStrings[msgid]);
        [inputQueue addObject:[NSNumber numberWithInt:msgid]];
        [inputQueue addObject:(data ? (id)data : (id)[NSNull null])];
    }

    // See waitForInput: for an explanation of this flag.
    inputReceived = YES;
}

- (oneway void)processInputAndData:(in bycopy NSArray *)messages
{
    // TODO: Get rid of this method?
    //NSLog(@"%s%@", _cmd, messages);

    unsigned i, count = [messages count];
    for (i = 0; i < count; i += 2) {
        int msgid = [[messages objectAtIndex:i] intValue];
        id data = [messages objectAtIndex:i+1];
        if ([data isEqual:[NSNull null]])
            data = nil;

        [self processInput:msgid data:data];
    }
}

- (NSString *)evaluateExpression:(in bycopy NSString *)expr
{
    NSString *eval = nil;
    char_u *s = (char_u*)[expr UTF8String];

#ifdef FEAT_MBYTE
    s = CONVERT_FROM_UTF8(s);
#endif

    char_u *res = eval_client_expr_to_string(s);

#ifdef FEAT_MBYTE
    CONVERT_FROM_UTF8_FREE(s);
#endif

    if (res != NULL) {
        s = res;
#ifdef FEAT_MBYTE
        s = CONVERT_TO_UTF8(s);
#endif
        eval = [NSString stringWithUTF8String:(char*)s];
#ifdef FEAT_MBYTE
        CONVERT_TO_UTF8_FREE(s);
#endif
        vim_free(res);
    }

    return eval;
}

- (BOOL)starRegisterToPasteboard:(byref NSPasteboard *)pboard
{
    // TODO: This method should share code with clip_mch_request_selection().

    if (VIsual_active && (State & NORMAL) && clip_star.available) {
        // If there is no pasteboard, return YES to indicate that there is text
        // to copy.
        if (!pboard)
            return YES;

        clip_copy_selection();

        // Get the text to put on the pasteboard.
        long_u llen = 0; char_u *str = 0;
        int type = clip_convert_selection(&str, &llen, &clip_star);
        if (type < 0)
            return NO;
        
        // TODO: Avoid overflow.
        int len = (int)llen;
#ifdef FEAT_MBYTE
        if (output_conv.vc_type != CONV_NONE) {
            char_u *conv_str = string_convert(&output_conv, str, &len);
            if (conv_str) {
                vim_free(str);
                str = conv_str;
            }
        }
#endif

        NSString *string = [[NSString alloc]
            initWithBytes:str length:len encoding:NSUTF8StringEncoding];

        NSArray *types = [NSArray arrayWithObject:NSStringPboardType];
        [pboard declareTypes:types owner:nil];
        BOOL ok = [pboard setString:string forType:NSStringPboardType];
    
        [string release];
        vim_free(str);

        return ok;
    }

    return NO;
}

- (oneway void)addReply:(in bycopy NSString *)reply
                 server:(in byref id <MMVimServerProtocol>)server
{
    //NSLog(@"addReply:%@ server:%@", reply, (id)server);

    // Replies might come at any time and in any order so we keep them in an
    // array inside a dictionary with the send port used as key.

    NSConnection *conn = [(NSDistantObject*)server connectionForProxy];
    // HACK! Assume connection uses mach ports.
    int port = [(NSMachPort*)[conn sendPort] machPort];
    NSNumber *key = [NSNumber numberWithInt:port];

    NSMutableArray *replies = [serverReplyDict objectForKey:key];
    if (!replies) {
        replies = [NSMutableArray array];
        [serverReplyDict setObject:replies forKey:key];
    }

    [replies addObject:reply];
}

- (void)addInput:(in bycopy NSString *)input
                 client:(in byref id <MMVimClientProtocol>)client
{
    //NSLog(@"addInput:%@ client:%@", input, (id)client);

    [self addInput:input];
    [self addClient:(id)client];

    inputReceived = YES;
}

- (NSString *)evaluateExpression:(in bycopy NSString *)expr
                 client:(in byref id <MMVimClientProtocol>)client
{
    [self addClient:(id)client];
    return [self evaluateExpression:expr];
}

- (void)registerServerWithName:(NSString *)name
{
    NSString *svrName = name;
    NSConnection *svrConn = [NSConnection defaultConnection];
    unsigned i;

    for (i = 0; i < MMServerMax; ++i) {
        NSString *connName = [self connectionNameFromServerName:svrName];

        if ([svrConn registerName:connName]) {
            //NSLog(@"Registered server with name: %@", svrName);

            // TODO: Set request/reply time-outs to something else?
            //
            // Don't wait for requests (time-out means that the message is
            // dropped).
            [svrConn setRequestTimeout:0];
            //[svrConn setReplyTimeout:MMReplyTimeout];
            [svrConn setRootObject:self];

            char_u *s = (char_u*)[svrName UTF8String];
#ifdef FEAT_MBYTE
            s = CONVERT_FROM_UTF8(s);
#endif
            // NOTE: 'serverName' is a global variable
            serverName = vim_strsave(s);
#ifdef FEAT_MBYTE
            CONVERT_FROM_UTF8_FREE(s);
#endif
#ifdef FEAT_EVAL
            set_vim_var_string(VV_SEND_SERVER, serverName, -1);
#endif
#ifdef FEAT_TITLE
            need_maketitle = TRUE;
#endif
            [self queueMessage:SetServerNameMsgID data:
                    [svrName dataUsingEncoding:NSUTF8StringEncoding]];
            break;
        }

        svrName = [NSString stringWithFormat:@"%@%d", name, i+1];
    }
}

- (BOOL)sendToServer:(NSString *)name string:(NSString *)string
               reply:(char_u **)reply port:(int *)port expression:(BOOL)expr
              silent:(BOOL)silent
{
    // NOTE: If 'name' equals 'serverName' then the request is local (client
    // and server are the same).  This case is not handled separately, so a
    // connection will be set up anyway (this simplifies the code).

    NSConnection *conn = [self connectionForServerName:name];
    if (!conn) {
        if (!silent) {
            char_u *s = (char_u*)[name UTF8String];
#ifdef FEAT_MBYTE
            s = CONVERT_FROM_UTF8(s);
#endif
            EMSG2(_(e_noserver), s);
#ifdef FEAT_MBYTE
            CONVERT_FROM_UTF8_FREE(s);
#endif
        }
        return NO;
    }

    if (port) {
        // HACK! Assume connection uses mach ports.
        *port = [(NSMachPort*)[conn sendPort] machPort];
    }

    id proxy = [conn rootProxy];
    [proxy setProtocolForProxy:@protocol(MMVimServerProtocol)];

    @try {
        if (expr) {
            NSString *eval = [proxy evaluateExpression:string client:self];
            if (reply) {
                if (eval) {
                    char_u *r = (char_u*)[eval UTF8String];
#ifdef FEAT_MBYTE
                    r = CONVERT_FROM_UTF8(r);
#endif
                    *reply = vim_strsave(r);
#ifdef FEAT_MBYTE
                    CONVERT_FROM_UTF8_FREE(r);
#endif
                } else {
                    *reply = vim_strsave((char_u*)_(e_invexprmsg));
                }
            }

            if (!eval)
                return NO;
        } else {
            [proxy addInput:string client:self];
        }
    }
    @catch (NSException *e) {
        NSLog(@"WARNING: Caught exception in %s: \"%@\"", _cmd, e);
        return NO;
    }

    return YES;
}

- (NSArray *)serverList
{
    NSArray *list = nil;

    if ([self connection]) {
        id proxy = [connection rootProxy];
        [proxy setProtocolForProxy:@protocol(MMAppProtocol)];

        @try {
            list = [proxy serverList];
        }
        @catch (NSException *e) {
            NSLog(@"Exception caught when listing servers: \"%@\"", e);
        }
    } else {
        EMSG(_("E???: No connection to MacVim, server listing not possible."));
    }

    return list;
}

- (NSString *)peekForReplyOnPort:(int)port
{
    //NSLog(@"%s%d", _cmd, port);

    NSNumber *key = [NSNumber numberWithInt:port];
    NSMutableArray *replies = [serverReplyDict objectForKey:key];
    if (replies && [replies count]) {
        //NSLog(@"    %d replies, topmost is: %@", [replies count],
        //        [replies objectAtIndex:0]);
        return [replies objectAtIndex:0];
    }

    //NSLog(@"    No replies");
    return nil;
}

- (NSString *)waitForReplyOnPort:(int)port
{
    //NSLog(@"%s%d", _cmd, port);
    
    NSConnection *conn = [self connectionForServerPort:port];
    if (!conn)
        return nil;

    NSNumber *key = [NSNumber numberWithInt:port];
    NSMutableArray *replies = nil;
    NSString *reply = nil;

    // Wait for reply as long as the connection to the server is valid (unless
    // user interrupts wait with Ctrl-C).
    while (!got_int && [conn isValid] &&
            !(replies = [serverReplyDict objectForKey:key])) {
        [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
                                 beforeDate:[NSDate distantFuture]];
    }

    if (replies) {
        if ([replies count] > 0) {
            reply = [[replies objectAtIndex:0] retain];
            //NSLog(@"    Got reply: %@", reply);
            [replies removeObjectAtIndex:0];
            [reply autorelease];
        }

        if ([replies count] == 0)
            [serverReplyDict removeObjectForKey:key];
    }

    return reply;
}

- (BOOL)sendReply:(NSString *)reply toPort:(int)port
{
    id client = [clientProxyDict objectForKey:[NSNumber numberWithInt:port]];
    if (client) {
        @try {
            //NSLog(@"sendReply:%@ toPort:%d", reply, port);
            [client addReply:reply server:self];
            return YES;
        }
        @catch (NSException *e) {
            NSLog(@"WARNING: Exception caught in %s: \"%@\"", _cmd, e);
        }
    } else {
        EMSG2(_("E???: server2client failed; no client with id 0x%x"), port);
    }

    return NO;
}

@end // MMBackend



@implementation MMBackend (Private)

- (void)queueVimStateMessage
{
    // NOTE: This is the place to add Vim state that needs to be accessed from
    // MacVim.  Do not add state that could potentially require lots of memory
    // since this message gets sent each time the output queue is forcibly
    // flushed (e.g. storing the currently selected text would be a bad idea).
    // We take this approach of "pushing" the state to MacVim to avoid having
    // to make synchronous calls from MacVim to Vim in order to get state.
    NSDictionary *vimState = [NSDictionary dictionaryWithObjectsAndKeys:
        [[NSFileManager defaultManager] currentDirectoryPath], @"pwd",
        nil];

    [self queueMessage:SetVimStateMsgID data:[vimState dictionaryAsData]];
}

- (void)processInputQueue
{
    // NOTE: One of the input events may cause this method to be called
    // recursively, so copy the input queue to a local variable and clear it
    // before starting to process input events (otherwise we could get stuck in
    // an endless loop).
    NSArray *q = [inputQueue copy];
    unsigned i, count = [q count];

    [inputQueue removeAllObjects];

    for (i = 0; i < count-1; i += 2) {
        int msgid = [[q objectAtIndex:i] intValue];
        id data = [q objectAtIndex:i+1];
        if ([data isEqual:[NSNull null]])
            data = nil;

        //NSLog(@"(%d) %s:%s", i, _cmd, MessageStrings[msgid]);
        [self handleInputEvent:msgid data:data];
    }

    [q release];
    //NSLog(@"Clear input event queue");
}

- (void)handleInputEvent:(int)msgid data:(NSData *)data
{
    // NOTE: Be careful with what you do in this method.  Ideally, a message
    // should be handled by adding something to the input buffer and returning
    // immediately.  If you call a Vim function then it should not enter a loop
    // waiting for key presses or in any other way block the process.  The
    // reason for this being that only one message can be processed at a time,
    // so if another message is received while processing, then the new message
    // is dropped.  See also the comment in processInput:data:.

    //NSLog(@"%s%s", _cmd, MessageStrings[msgid]);

    if (SelectTabMsgID == msgid) {
        if (!data) return;
        const void *bytes = [data bytes];
        int idx = *((int*)bytes) + 1;
        //NSLog(@"Selecting tab %d", idx);
        send_tabline_event(idx);
    } else if (CloseTabMsgID == msgid) {
        if (!data) return;
        const void *bytes = [data bytes];
        int idx = *((int*)bytes) + 1;
        //NSLog(@"Closing tab %d", idx);
        send_tabline_menu_event(idx, TABLINE_MENU_CLOSE);
    } else if (AddNewTabMsgID == msgid) {
        //NSLog(@"Adding new tab");
        send_tabline_menu_event(0, TABLINE_MENU_NEW);
    } else if (DraggedTabMsgID == msgid) {
        if (!data) return;
        const void *bytes = [data bytes];
        // NOTE! The destination index is 0 based, so do not add 1 to make it 1
        // based.
        int idx = *((int*)bytes);

        tabpage_move(idx);
    } else if (SetTextDimensionsMsgID == msgid || LiveResizeMsgID == msgid) {
        if (!data) return;
        const void *bytes = [data bytes];
        int rows = *((int*)bytes);  bytes += sizeof(int);
        int cols = *((int*)bytes);  bytes += sizeof(int);

        // NOTE! Vim doesn't call gui_mch_set_shellsize() after
        // gui_resize_shell(), so we have to manually set the rows and columns
        // here.  (MacVim doesn't change the rows and columns to avoid
        // inconsistent states between Vim and MacVim.)
        [self queueMessage:msgid data:data];

        //NSLog(@"[VimTask] Resizing shell to %dx%d.", cols, rows);
        gui_resize_shell(cols, rows);
    } else if (ExecuteMenuMsgID == msgid) {
        if (!data) return;
        const void *bytes = [data bytes];
        int tag = *((int*)bytes);  bytes += sizeof(int);

        vimmenu_T *menu = (vimmenu_T*)tag;
        // TODO!  Make sure 'menu' is a valid menu pointer!
        if (menu) {
            gui_menu_cb(menu);
        }
    } else if (ToggleToolbarMsgID == msgid) {
        [self handleToggleToolbar];
    } else if (ScrollbarEventMsgID == msgid) {
        [self handleScrollbarEvent:data];
    } else if (SetFontMsgID == msgid) {
        [self handleSetFont:data];
    } else if (VimShouldCloseMsgID == msgid) {
        gui_shell_closed();
    } else if (DropFilesMsgID == msgid) {
        [self handleDropFiles:data];
    } else if (DropStringMsgID == msgid) {
        [self handleDropString:data];
    } else if (GotFocusMsgID == msgid) {
        if (!gui.in_focus)
            [self focusChange:YES];
    } else if (LostFocusMsgID == msgid) {
        if (gui.in_focus)
            [self focusChange:NO];
    } else if (SetMouseShapeMsgID == msgid) {
        const void *bytes = [data bytes];
        int shape = *((int*)bytes);  bytes += sizeof(int);
        update_mouseshape(shape);
    } else if (ODBEditMsgID == msgid) {
        [self handleOdbEdit:data];
    } else if (XcodeModMsgID == msgid) {
        [self handleXcodeMod:data];
    } else {
        NSLog(@"WARNING: Unknown message received (msgid=%d)", msgid);
    }
}

+ (NSDictionary *)specialKeys
{
    static NSDictionary *specialKeys = nil;

    if (!specialKeys) {
        NSBundle *mainBundle = [NSBundle mainBundle];
        NSString *path = [mainBundle pathForResource:@"SpecialKeys"
                                              ofType:@"plist"];
        specialKeys = [[NSDictionary alloc] initWithContentsOfFile:path];
    }

    return specialKeys;
}

- (void)handleInsertText:(NSData *)data
{
    if (!data) return;

    NSString *key = [[NSString alloc] initWithData:data
                                          encoding:NSUTF8StringEncoding];
    char_u *str = (char_u*)[key UTF8String];
    int i, len = [key lengthOfBytesUsingEncoding:NSUTF8StringEncoding];

#ifdef FEAT_MBYTE
    char_u *conv_str = NULL;
    if (input_conv.vc_type != CONV_NONE) {
        conv_str = string_convert(&input_conv, str, &len);
        if (conv_str)
            str = conv_str;
    }
#endif

    if (len == 1 && ((str[0] == Ctrl_C && ctrl_c_interrupts)
            || (str[0] == intr_char && intr_char != Ctrl_C))) {
        trash_input_buf();
        got_int = TRUE;
    }

    for (i = 0; i < len; ++i) {
        add_to_input_buf(str+i, 1);
        if (CSI == str[i]) {
            // NOTE: If the converted string contains the byte CSI, then it
            // must be followed by the bytes KS_EXTRA, KE_CSI or things
            // won't work.
            static char_u extra[2] = { KS_EXTRA, KE_CSI };
            add_to_input_buf(extra, 2);
        }
    }

#ifdef FEAT_MBYTE
    if (conv_str)
        vim_free(conv_str);
#endif
    [key release];
}

- (void)handleKeyDown:(NSString *)key modifiers:(int)mods
{
    char_u special[3];
    char_u modChars[3];
    char_u *chars = (char_u*)[key UTF8String];
#ifdef FEAT_MBYTE
    char_u *conv_str = NULL;
#endif
    int length = [key lengthOfBytesUsingEncoding:NSUTF8StringEncoding];

    // Special keys (arrow keys, function keys, etc.) are stored in a plist so
    // that new keys can easily be added.
    NSString *specialString = [[MMBackend specialKeys]
            objectForKey:key];
    if (specialString && [specialString length] > 1) {
        //NSLog(@"special key: %@", specialString);
        int ikey = TO_SPECIAL([specialString characterAtIndex:0],
                [specialString characterAtIndex:1]);

        ikey = simplify_key(ikey, &mods);
        if (ikey == CSI)
            ikey = K_CSI;

        special[0] = CSI;
        special[1] = K_SECOND(ikey);
        special[2] = K_THIRD(ikey);

        chars = special;
        length = 3;
    } else if (1 == length && TAB == chars[0]) {
        // Tab is a trouble child:
        // - <Tab> is added to the input buffer as is
        // - <S-Tab> is translated to, {CSI,'k','B'} (i.e. 'Back-tab')
        // - <M-Tab> should be 0x80|TAB but this is not valid utf-8 so it needs
        //   to be converted to utf-8
        // - <S-M-Tab> is translated to <S-Tab> with ALT modifier
        // - <C-Tab> is reserved by Mac OS X
        // - <D-Tab> is reserved by Mac OS X
        chars = special;
        special[0] = TAB;
        length = 1;

        if (mods & MOD_MASK_SHIFT) {
            mods &= ~MOD_MASK_SHIFT;
            special[0] = CSI;
            special[1] = K_SECOND(K_S_TAB);
            special[2] = K_THIRD(K_S_TAB);
            length = 3;
        } else if (mods & MOD_MASK_ALT) {
            int mtab = 0x80 | TAB;
#ifdef FEAT_MBYTE
            if (enc_utf8) {
                // Convert to utf-8
                special[0] = (mtab >> 6) + 0xc0;
                special[1] = mtab & 0xbf;
                length = 2;
            } else
#endif
            {
                special[0] = mtab;
                length = 1;
            }
            mods &= ~MOD_MASK_ALT;
        }
    } else if (length > 0) {
        unichar c = [key characterAtIndex:0];

        //NSLog(@"non-special: %@ (hex=%x, mods=%d)", key,
        //        [key characterAtIndex:0], mods);

        if (length == 1 && ((c == Ctrl_C && ctrl_c_interrupts)
                || (c == intr_char && intr_char != Ctrl_C))) {
            trash_input_buf();
            got_int = TRUE;
        }

        // HACK!  In most circumstances the Ctrl and Shift modifiers should be
        // cleared since they are already added to the key by the AppKit.
        // Unfortunately, the only way to deal with when to clear the modifiers
        // or not seems to be to have hard-wired rules like this.
        if ( !((' ' == c) || (0xa0 == c) || (mods & MOD_MASK_CMD)
                    || 0x9 == c || 0xd == c || ESC == c) ) {
            mods &= ~MOD_MASK_SHIFT;
            mods &= ~MOD_MASK_CTRL;
            //NSLog(@"clear shift ctrl");
        }

        // HACK!  All Option+key presses go via 'insert text' messages, except
        // for <M-Space>.  If the Alt flag is not cleared for <M-Space> it does
        // not work to map to it.
        if (0xa0 == c && !(mods & MOD_MASK_CMD)) {
            //NSLog(@"clear alt");
            mods &= ~MOD_MASK_ALT;
        }

#ifdef FEAT_MBYTE
        if (input_conv.vc_type != CONV_NONE) {
            conv_str = string_convert(&input_conv, chars, &length);
            if (conv_str)
                chars = conv_str;
        }
#endif
    }

    if (chars && length > 0) {
        if (mods) {
            //NSLog(@"adding mods: %d", mods);
            modChars[0] = CSI;
            modChars[1] = KS_MODIFIER;
            modChars[2] = mods;
            add_to_input_buf(modChars, 3);
        }

        //NSLog(@"add to input buf: 0x%x", chars[0]);
        // TODO: Check for CSI bytes?
        add_to_input_buf(chars, length);
    }

#ifdef FEAT_MBYTE
    if (conv_str)
        vim_free(conv_str);
#endif
}

- (void)queueMessage:(int)msgid data:(NSData *)data
{
    [outputQueue addObject:[NSData dataWithBytes:&msgid length:sizeof(int)]];
    if (data)
        [outputQueue addObject:data];
    else
        [outputQueue addObject:[NSData data]];
}

- (void)connectionDidDie:(NSNotification *)notification
{
    // If the main connection to MacVim is lost this means that MacVim was
    // either quit (by the user chosing Quit on the MacVim menu), or it has
    // crashed.  In the former case the flag 'isTerminating' is set and we then
    // quit cleanly; in the latter case we make sure the swap files are left
    // for recovery.

    //NSLog(@"%s isTerminating=%d", _cmd, isTerminating);
    if (isTerminating)
        getout(0);
    else
        getout_preserve_modified(1);
}

- (void)blinkTimerFired:(NSTimer *)timer
{
    NSTimeInterval timeInterval = 0;

    [blinkTimer release];
    blinkTimer = nil;

    if (MMBlinkStateOn == blinkState) {
        gui_undraw_cursor();
        blinkState = MMBlinkStateOff;
        timeInterval = blinkOffInterval;
    } else if (MMBlinkStateOff == blinkState) {
        gui_update_cursor(TRUE, FALSE);
        blinkState = MMBlinkStateOn;
        timeInterval = blinkOnInterval;
    }

    if (timeInterval > 0) {
        blinkTimer = 
            [[NSTimer scheduledTimerWithTimeInterval:timeInterval target:self
                                            selector:@selector(blinkTimerFired:)
                                            userInfo:nil repeats:NO] retain];
        [self flushQueue:YES];
    }
}

- (void)focusChange:(BOOL)on
{
    gui_focus_change(on);
}

- (void)handleToggleToolbar
{
    // If 'go' contains 'T', then remove it, else add it.

    char_u go[sizeof(GO_ALL)+2];
    char_u *p;
    int len;

    STRCPY(go, p_go);
    p = vim_strchr(go, GO_TOOLBAR);
    len = STRLEN(go);

    if (p != NULL) {
        char_u *end = go + len;
        while (p < end) {
            p[0] = p[1];
            ++p;
        }
    } else {
        go[len] = GO_TOOLBAR;
        go[len+1] = NUL;
    }

    set_option_value((char_u*)"guioptions", 0, go, 0);

    // Force screen redraw (does it have to be this complicated?).
    redraw_all_later(CLEAR);
    update_screen(NOT_VALID);
    setcursor();
    out_flush();
    gui_update_cursor(FALSE, FALSE);
    gui_mch_flush();
}

- (void)handleScrollbarEvent:(NSData *)data
{
    if (!data) return;

    const void *bytes = [data bytes];
    long ident = *((long*)bytes);  bytes += sizeof(long);
    int hitPart = *((int*)bytes);  bytes += sizeof(int);
    float fval = *((float*)bytes);  bytes += sizeof(float);
    scrollbar_T *sb = gui_find_scrollbar(ident);

    if (sb) {
        scrollbar_T *sb_info = sb->wp ? &sb->wp->w_scrollbars[0] : sb;
        long value = sb_info->value;
        long size = sb_info->size;
        long max = sb_info->max;
        BOOL isStillDragging = NO;
        BOOL updateKnob = YES;

        switch (hitPart) {
        case NSScrollerDecrementPage:
            value -= (size > 2 ? size - 2 : 1);
            break;
        case NSScrollerIncrementPage:
            value += (size > 2 ? size - 2 : 1);
            break;
        case NSScrollerDecrementLine:
            --value;
            break;
        case NSScrollerIncrementLine:
            ++value;
            break;
        case NSScrollerKnob:
            isStillDragging = YES;
            // fall through ...
        case NSScrollerKnobSlot:
            value = (long)(fval * (max - size + 1));
            // fall through ...
        default:
            updateKnob = NO;
            break;
        }

        //NSLog(@"value %d -> %d", sb_info->value, value);
        gui_drag_scrollbar(sb, value, isStillDragging);

        if (updateKnob) {
            // Dragging the knob or option+clicking automatically updates
            // the knob position (on the actual NSScroller), so we only
            // need to set the knob position in the other cases.
            if (sb->wp) {
                // Update both the left&right vertical scrollbars.
                long identLeft = sb->wp->w_scrollbars[SBAR_LEFT].ident;
                long identRight = sb->wp->w_scrollbars[SBAR_RIGHT].ident;
                [self setScrollbarThumbValue:value size:size max:max
                                  identifier:identLeft];
                [self setScrollbarThumbValue:value size:size max:max
                                  identifier:identRight];
            } else {
                // Update the horizontal scrollbar.
                [self setScrollbarThumbValue:value size:size max:max
                                  identifier:ident];
            }
        }
    }
}

- (void)handleSetFont:(NSData *)data
{
    if (!data) return;

    const void *bytes = [data bytes];
    float pointSize = *((float*)bytes);  bytes += sizeof(float);
    //unsigned len = *((unsigned*)bytes);  bytes += sizeof(unsigned);
    bytes += sizeof(unsigned);  // len not used

    NSMutableString *name = [NSMutableString stringWithUTF8String:bytes];
    [name appendString:[NSString stringWithFormat:@":h%.2f", pointSize]];
    char_u *s = (char_u*)[name UTF8String];

#ifdef FEAT_MBYTE
    s = CONVERT_FROM_UTF8(s);
#endif

    set_option_value((char_u*)"guifont", 0, s, 0);

#ifdef FEAT_MBYTE
    CONVERT_FROM_UTF8_FREE(s);
#endif

    // Force screen redraw (does it have to be this complicated?).
    redraw_all_later(CLEAR);
    update_screen(NOT_VALID);
    setcursor();
    out_flush();
    gui_update_cursor(FALSE, FALSE);
    gui_mch_flush();
}

- (void)handleDropFiles:(NSData *)data
{
    // TODO: Get rid of this method; instead use Vim script directly.  At the
    // moment I know how to do this to open files in tabs, but I'm not sure how
    // to add the filenames to the command line when in command line mode.

    if (!data) return;

#ifdef FEAT_DND
    const void *bytes = [data bytes];
    const void *end = [data bytes] + [data length];
    BOOL forceOpen = *((BOOL*)bytes);  bytes += sizeof(BOOL);
    int n = *((int*)bytes);  bytes += sizeof(int);

    if (!forceOpen && (State & CMDLINE)) {
        // HACK!  If Vim is in command line mode then the files names
        // should be added to the command line, instead of opening the
        // files in tabs (unless forceOpen is set).  This is taken care of by
        // gui_handle_drop().
        char_u **fnames = (char_u **)alloc(n * sizeof(char_u *));
        if (fnames) {
            int i = 0;
            while (bytes < end && i < n) {
                int len = *((int*)bytes);  bytes += sizeof(int);
                char_u *s = (char_u*)bytes;
#ifdef FEAT_MBYTE
                s = CONVERT_FROM_UTF8(s);
#endif
                fnames[i++] = vim_strsave(s);
#ifdef FEAT_MBYTE
                CONVERT_FROM_UTF8_FREE(s);
#endif
                bytes += len;
            }

            // NOTE!  This function will free 'fnames'.
            // HACK!  It is assumed that the 'x' and 'y' arguments are
            // unused when in command line mode.
            gui_handle_drop(0, 0, 0, fnames, i < n ? i : n);
        }
    } else {
        // HACK!  I'm not sure how to get Vim to open a list of files in
        // tabs, so instead I create a ':tab drop' command with all the
        // files to open and execute it.
        NSMutableString *cmd = [NSMutableString stringWithString:@":tab drop"];

        int i;
        for (i = 0; i < n && bytes < end; ++i) {
            int len = *((int*)bytes);  bytes += sizeof(int);
            NSString *file = [NSString stringWithUTF8String:bytes];
            file = [file stringByEscapingSpecialFilenameCharacters];
            bytes += len;

            [cmd appendString:@" "];
            [cmd appendString:file];
        }

        // By going to the last tabpage we ensure that the new tabs will
        // appear last (if this call is left out, the taborder becomes
        // messy).
        goto_tabpage(9999);

        char_u *s = (char_u*)[cmd UTF8String];
#ifdef FEAT_MBYTE
        s = CONVERT_FROM_UTF8(s);
#endif
        do_cmdline_cmd(s);
#ifdef FEAT_MBYTE
        CONVERT_FROM_UTF8_FREE(s);
#endif

        // Force screen redraw (does it have to be this complicated?).
        // (This code was taken from the end of gui_handle_drop().)
        update_screen(NOT_VALID);
        setcursor();
        out_flush();
        gui_update_cursor(FALSE, FALSE);
        maketitle();
        gui_mch_flush();
    }
#endif // FEAT_DND
}

- (void)handleDropString:(NSData *)data
{
    if (!data) return;

#ifdef FEAT_DND
    char_u  dropkey[3] = { CSI, KS_EXTRA, (char_u)KE_DROP };
    const void *bytes = [data bytes];
    int len = *((int*)bytes);  bytes += sizeof(int);
    NSMutableString *string = [NSMutableString stringWithUTF8String:bytes];

    // Replace unrecognized end-of-line sequences with \x0a (line feed).
    NSRange range = { 0, [string length] };
    unsigned n = [string replaceOccurrencesOfString:@"\x0d\x0a"
                                         withString:@"\x0a" options:0
                                              range:range];
    if (0 == n) {
        n = [string replaceOccurrencesOfString:@"\x0d" withString:@"\x0a"
                                       options:0 range:range];
    }

    len = [string lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
    char_u *s = (char_u*)[string UTF8String];
#ifdef FEAT_MBYTE
    if (input_conv.vc_type != CONV_NONE)
        s = string_convert(&input_conv, s, &len);
#endif
    dnd_yank_drag_data(s, len);
#ifdef FEAT_MBYTE
    if (input_conv.vc_type != CONV_NONE)
        vim_free(s);
#endif
    add_to_input_buf(dropkey, sizeof(dropkey));
#endif // FEAT_DND
}

- (void)handleOdbEdit:(NSData *)data
{
#ifdef FEAT_ODB_EDITOR
    const void *bytes = [data bytes];

    OSType serverID = *((OSType*)bytes);  bytes += sizeof(OSType);

    char_u *path = NULL;
    int pathLen = *((int*)bytes);  bytes += sizeof(int);
    if (pathLen > 0) {
        path = (char_u*)bytes;
        bytes += pathLen;
#ifdef FEAT_MBYTE
        path = CONVERT_FROM_UTF8(path);
#endif
    }

    NSAppleEventDescriptor *token = nil;
    DescType tokenType = *((DescType*)bytes);  bytes += sizeof(DescType);
    int descLen = *((int*)bytes);  bytes += sizeof(int);
    if (descLen > 0) {
        token = [NSAppleEventDescriptor descriptorWithDescriptorType:tokenType
                                                               bytes:bytes
                                                              length:descLen];
        bytes += descLen;
    }

    unsigned i, numFiles = *((unsigned*)bytes);  bytes += sizeof(unsigned);
    for (i = 0; i < numFiles; ++i) {
        int len = *((int*)bytes);  bytes += sizeof(int);
        char_u *filename = (char_u*)bytes;
#ifdef FEAT_MBYTE
        filename = CONVERT_FROM_UTF8(filename);
#endif
        buf_T *buf = buflist_findname(filename);
        if (buf) {
            if (buf->b_odb_token) {
                [(NSAppleEventDescriptor*)(buf->b_odb_token) release];
                buf->b_odb_token = NULL;
            }

            if (buf->b_odb_fname) {
                vim_free(buf->b_odb_fname);
                buf->b_odb_fname = NULL;
            }

            buf->b_odb_server_id = serverID;

            if (token)
                buf->b_odb_token = [token retain];
            if (path)
                buf->b_odb_fname = vim_strsave(path);
        } else {
            NSLog(@"WARNING: Could not find buffer '%s' for ODB editing.",
                    filename);
        }

#ifdef FEAT_MBYTE
        CONVERT_FROM_UTF8_FREE(filename);
#endif
        bytes += len;
    }
#ifdef FEAT_MBYTE
    CONVERT_FROM_UTF8_FREE(path);
#endif
#endif // FEAT_ODB_EDITOR
}

- (void)handleXcodeMod:(NSData *)data
{
#if 0
    const void *bytes = [data bytes];
    DescType type = *((DescType*)bytes);  bytes += sizeof(DescType);
    unsigned len = *((unsigned*)bytes);  bytes += sizeof(unsigned);
    if (0 == len)
        return;

    NSAppleEventDescriptor *replyEvent = [NSAppleEventDescriptor
            descriptorWithDescriptorType:type
                                   bytes:bytes
                                  length:len];
#endif
}

- (BOOL)checkForModifiedBuffers
{
    buf_T *buf;
    for (buf = firstbuf; buf != NULL; buf = buf->b_next) {
        if (bufIsChanged(buf)) {
            return YES;
        }
    }

    return NO;
}

- (void)addInput:(NSString *)input
{
    char_u *s = (char_u*)[input UTF8String];

#ifdef FEAT_MBYTE
    s = CONVERT_FROM_UTF8(s);
#endif

    server_to_input_buf(s);

#ifdef FEAT_MBYTE
    CONVERT_FROM_UTF8_FREE(s);
#endif
}

@end // MMBackend (Private)




@implementation MMBackend (ClientServer)

- (NSString *)connectionNameFromServerName:(NSString *)name
{
    NSString *bundleIdentifier = [[NSBundle mainBundle] bundleIdentifier];

    return [[NSString stringWithFormat:@"%@.%@", bundleIdentifier, name]
        lowercaseString];
}

- (NSConnection *)connectionForServerName:(NSString *)name
{
    // TODO: Try 'name%d' if 'name' fails.
    NSString *connName = [self connectionNameFromServerName:name];
    NSConnection *svrConn = [connectionNameDict objectForKey:connName];

    if (!svrConn) {
        svrConn = [NSConnection connectionWithRegisteredName:connName
                                                           host:nil];
        // Try alternate server...
        if (!svrConn && alternateServerName) {
            //NSLog(@"  trying to connect to alternate server: %@",
            //        alternateServerName);
            connName = [self connectionNameFromServerName:alternateServerName];
            svrConn = [NSConnection connectionWithRegisteredName:connName
                                                            host:nil];
        }

        // Try looking for alternate servers...
        if (!svrConn) {
            //NSLog(@"  looking for alternate servers...");
            NSString *alt = [self alternateServerNameForName:name];
            if (alt != alternateServerName) {
                //NSLog(@"  found alternate server: %@", string);
                [alternateServerName release];
                alternateServerName = [alt copy];
            }
        }

        // Try alternate server again...
        if (!svrConn && alternateServerName) {
            //NSLog(@"  trying to connect to alternate server: %@",
            //        alternateServerName);
            connName = [self connectionNameFromServerName:alternateServerName];
            svrConn = [NSConnection connectionWithRegisteredName:connName
                                                            host:nil];
        }

        if (svrConn) {
            [connectionNameDict setObject:svrConn forKey:connName];

            //NSLog(@"Adding %@ as connection observer for %@", self, svrConn);
            [[NSNotificationCenter defaultCenter] addObserver:self
                    selector:@selector(serverConnectionDidDie:)
                        name:NSConnectionDidDieNotification object:svrConn];
        }
    }

    return svrConn;
}

- (NSConnection *)connectionForServerPort:(int)port
{
    NSConnection *conn;
    NSEnumerator *e = [connectionNameDict objectEnumerator];

    while ((conn = [e nextObject])) {
        // HACK! Assume connection uses mach ports.
        if (port == [(NSMachPort*)[conn sendPort] machPort])
            return conn;
    }

    return nil;
}

- (void)serverConnectionDidDie:(NSNotification *)notification
{
    //NSLog(@"%s%@", _cmd, notification);

    NSConnection *svrConn = [notification object];

    //NSLog(@"Removing %@ as connection observer from %@", self, svrConn);
    [[NSNotificationCenter defaultCenter]
            removeObserver:self
                      name:NSConnectionDidDieNotification
                    object:svrConn];

    [connectionNameDict removeObjectsForKeys:
        [connectionNameDict allKeysForObject:svrConn]];

    // HACK! Assume connection uses mach ports.
    int port = [(NSMachPort*)[svrConn sendPort] machPort];
    NSNumber *key = [NSNumber numberWithInt:port];

    [clientProxyDict removeObjectForKey:key];
    [serverReplyDict removeObjectForKey:key];
}

- (void)addClient:(NSDistantObject *)client
{
    NSConnection *conn = [client connectionForProxy];
    // HACK! Assume connection uses mach ports.
    int port = [(NSMachPort*)[conn sendPort] machPort];
    NSNumber *key = [NSNumber numberWithInt:port];

    if (![clientProxyDict objectForKey:key]) {
        [client setProtocolForProxy:@protocol(MMVimClientProtocol)];
        [clientProxyDict setObject:client forKey:key];
    }

    // NOTE: 'clientWindow' is a global variable which is used by <client>
    clientWindow = port;
}

- (NSString *)alternateServerNameForName:(NSString *)name
{
    if (!(name && [name length] > 0))
        return nil;

    // Only look for alternates if 'name' doesn't end in a digit.
    unichar lastChar = [name characterAtIndex:[name length]-1];
    if (lastChar >= '0' && lastChar <= '9')
        return nil;

    // Look for alternates among all current servers.
    NSArray *list = [self serverList];
    if (!(list && [list count] > 0))
        return nil;

    // Filter out servers starting with 'name' and ending with a number. The
    // (?i) pattern ensures that the match is case insensitive.
    NSString *pat = [NSString stringWithFormat:@"(?i)%@[0-9]+\\z", name];
    NSPredicate *pred = [NSPredicate predicateWithFormat:
            @"SELF MATCHES %@", pat];
    list = [list filteredArrayUsingPredicate:pred];
    if ([list count] > 0) {
        list = [list sortedArrayUsingSelector:@selector(serverNameCompare:)];
        return [list objectAtIndex:0];
    }

    return nil;
}

@end // MMBackend (ClientServer)




@implementation NSString (MMServerNameCompare)
- (NSComparisonResult)serverNameCompare:(NSString *)string
{
    return [self compare:string
                 options:NSCaseInsensitiveSearch|NSNumericSearch];
}
@end




static int eventModifierFlagsToVimModMask(int modifierFlags)
{
    int modMask = 0;

    if (modifierFlags & NSShiftKeyMask)
        modMask |= MOD_MASK_SHIFT;
    if (modifierFlags & NSControlKeyMask)
        modMask |= MOD_MASK_CTRL;
    if (modifierFlags & NSAlternateKeyMask)
        modMask |= MOD_MASK_ALT;
    if (modifierFlags & NSCommandKeyMask)
        modMask |= MOD_MASK_CMD;

    return modMask;
}

static int vimModMaskToEventModifierFlags(int mods)
{
    int flags = 0;

    if (mods & MOD_MASK_SHIFT)
        flags |= NSShiftKeyMask;
    if (mods & MOD_MASK_CTRL)
        flags |= NSControlKeyMask;
    if (mods & MOD_MASK_ALT)
        flags |= NSAlternateKeyMask;
    if (mods & MOD_MASK_CMD)
        flags |= NSCommandKeyMask;

    return flags;
}

static int eventModifierFlagsToVimMouseModMask(int modifierFlags)
{
    int modMask = 0;

    if (modifierFlags & NSShiftKeyMask)
        modMask |= MOUSE_SHIFT;
    if (modifierFlags & NSControlKeyMask)
        modMask |= MOUSE_CTRL;
    if (modifierFlags & NSAlternateKeyMask)
        modMask |= MOUSE_ALT;

    return modMask;
}

static int eventButtonNumberToVimMouseButton(int buttonNumber)
{
    static int mouseButton[] = { MOUSE_LEFT, MOUSE_RIGHT, MOUSE_MIDDLE };

    return (buttonNumber >= 0 && buttonNumber < 3)
            ? mouseButton[buttonNumber] : -1;
}

static int specialKeyToNSKey(int key)
{
    if (!IS_SPECIAL(key))
        return key;

    static struct {
        int special;
        int nskey;
    } sp2ns[] = {
        { K_UP, NSUpArrowFunctionKey },
        { K_DOWN, NSDownArrowFunctionKey },
        { K_LEFT, NSLeftArrowFunctionKey },
        { K_RIGHT, NSRightArrowFunctionKey },
        { K_F1, NSF1FunctionKey },
        { K_F2, NSF2FunctionKey },
        { K_F3, NSF3FunctionKey },
        { K_F4, NSF4FunctionKey },
        { K_F5, NSF5FunctionKey },
        { K_F6, NSF6FunctionKey },
        { K_F7, NSF7FunctionKey },
        { K_F8, NSF8FunctionKey },
        { K_F9, NSF9FunctionKey },
        { K_F10, NSF10FunctionKey },
        { K_F11, NSF11FunctionKey },
        { K_F12, NSF12FunctionKey },
        { K_F13, NSF13FunctionKey },
        { K_F14, NSF14FunctionKey },
        { K_F15, NSF15FunctionKey },
        { K_F16, NSF16FunctionKey },
        { K_F17, NSF17FunctionKey },
        { K_F18, NSF18FunctionKey },
        { K_F19, NSF19FunctionKey },
        { K_F20, NSF20FunctionKey },
        { K_F21, NSF21FunctionKey },
        { K_F22, NSF22FunctionKey },
        { K_F23, NSF23FunctionKey },
        { K_F24, NSF24FunctionKey },
        { K_F25, NSF25FunctionKey },
        { K_F26, NSF26FunctionKey },
        { K_F27, NSF27FunctionKey },
        { K_F28, NSF28FunctionKey },
        { K_F29, NSF29FunctionKey },
        { K_F30, NSF30FunctionKey },
        { K_F31, NSF31FunctionKey },
        { K_F32, NSF32FunctionKey },
        { K_F33, NSF33FunctionKey },
        { K_F34, NSF34FunctionKey },
        { K_F35, NSF35FunctionKey },
        { K_DEL, NSBackspaceCharacter },
        { K_BS, NSDeleteCharacter },
        { K_HOME, NSHomeFunctionKey },
        { K_END, NSEndFunctionKey },
        { K_PAGEUP, NSPageUpFunctionKey },
        { K_PAGEDOWN, NSPageDownFunctionKey }
    };

    int i;
    for (i = 0; i < sizeof(sp2ns)/sizeof(sp2ns[0]); ++i) {
        if (sp2ns[i].special == key)
            return sp2ns[i].nskey;
    }

    return 0;
}