Avoid crash when resizing window

[MacVim.git] / src / MacVim / gui_macvim.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.
 */
/*
 * gui_macvim.m
 *
 * Hooks for the Vim gui code.  Mainly passes control on to MMBackend.
 */

#import "MMBackend.h"
#import "MacVim.h"
#import "vim.h"
#import <Foundation/Foundation.h>



// NOTE: The default font is bundled with the application.
static NSString *MMDefaultFontName = @"DejaVu Sans Mono";
static float MMDefaultFontSize = 12.0f;
static float MMMinFontSize = 6.0f;
static float MMMaxFontSize = 100.0f;
static BOOL gui_mch_init_has_finished = NO;


static NSFont *gui_macvim_font_with_name(char_u *name);
static int specialKeyToNSKey(int key);
static int vimModMaskToEventModifierFlags(int mods);

NSArray *descriptor_for_menu(vimmenu_T *menu);
vimmenu_T *menu_for_descriptor(NSArray *desc);



// -- Initialization --------------------------------------------------------

/*
 * Parse the GUI related command-line arguments.  Any arguments used are
 * deleted from argv, and *argc is decremented accordingly.  This is called
 * when vim is started, whether or not the GUI has been started.
 */
    void
gui_mch_prepare(int *argc, char **argv)
{
    //NSLog(@"gui_mch_prepare(argc=%d)", *argc);

    // Set environment variables $VIM and $VIMRUNTIME
    // NOTE!  If vim_getenv is called with one of these as parameters before
    // they have been set here, they will most likely end up with the wrong
    // values!
    //
    // TODO:
    // - ensure this is called first to avoid above problem
    // - encoding

    NSString *path = [[[NSBundle mainBundle] resourcePath]
        stringByAppendingPathComponent:@"vim"];
    vim_setenv((char_u*)"VIM", (char_u*)[path UTF8String]);

    path = [path stringByAppendingPathComponent:@"runtime"];
    vim_setenv((char_u*)"VIMRUNTIME", (char_u*)[path UTF8String]);

    int i;
    for (i = 0; i < *argc; ++i) {
        if (strncmp(argv[i], "--mmwaitforack", 14) == 0) {
            [[MMBackend sharedInstance] setWaitForAck:YES];
            --*argc;
            if (*argc > i)
                mch_memmove(&argv[i], &argv[i+1], (*argc-i) * sizeof(char*));
            break;
        }
    }
}


/*
 * Check if the GUI can be started.  Called before gvimrc is sourced.
 * Return OK or FAIL.
 */
    int
gui_mch_init_check(void)
{
    //NSLog(@"gui_mch_init_check()");
    return OK;
}


/*
 * Initialise the GUI.  Create all the windows, set up all the call-backs etc.
 * Returns OK for success, FAIL when the GUI can't be started.
 */
    int
gui_mch_init(void)
{
    //NSLog(@"gui_mch_init()");

    // NOTE! Because OS X has to exec after fork we effectively end up doing
    // the initialization twice (because this function is called before the
    // fork).  To avoid all this extra work we check if Vim is about to fork,
    // and if so do nothing for now.
    //
    // TODO: Is this check 100% foolproof?
    if (gui.dofork && (vim_strchr(p_go, GO_FORG) == NULL))
        return OK;

    if (![[MMBackend sharedInstance] checkin]) {
        // TODO: Kill the process if there is no terminal to fall back on,
        // otherwise the process will run outputting to the console.
        return FAIL;
    }

    // Force 'termencoding' to utf-8 (changes to 'tenc' are disallowed in
    // 'option.c', so that ':set termencoding=...' is impossible).
    set_option_value((char_u *)"termencoding", 0L, (char_u *)"utf-8", 0);

    // Set values so that pixels and characters are in one-to-one
    // correspondence (assuming all characters have the same dimensions).
    gui.scrollbar_width = gui.scrollbar_height = 0;

    gui.char_height = 1;
    gui.char_width = 1;
    gui.char_ascent = 0;

    gui_mch_def_colors();

    [[MMBackend sharedInstance]
        setDefaultColorsBackground:gui.back_pixel foreground:gui.norm_pixel];
    [[MMBackend sharedInstance] setBackgroundColor:gui.back_pixel];
    [[MMBackend sharedInstance] setForegroundColor:gui.norm_pixel];

    // NOTE: If this call is left out the cursor is opaque.
    highlight_gui_started();

    // Ensure 'linespace' option is passed along to MacVim in case it was set
    // in [g]vimrc.
    gui_mch_adjust_charheight();

    gui_mch_init_has_finished = YES;

    return OK;
}



    void
gui_mch_exit(int rc)
{
    //NSLog(@"gui_mch_exit(rc=%d)", rc);

    [[MMBackend sharedInstance] exit];
}


/*
 * Open the GUI window which was created by a call to gui_mch_init().
 */
    int
gui_mch_open(void)
{
    //NSLog(@"gui_mch_open()");

    // This check is to avoid doing extra work when we're about to fork.
    if (!gui_mch_init_has_finished)
        return OK;

    return [[MMBackend sharedInstance] openGUIWindow];
}


// -- Updating --------------------------------------------------------------


/*
 * Catch up with any queued X events.  This may put keyboard input into the
 * input buffer, call resize call-backs, trigger timers etc.  If there is
 * nothing in the X event queue (& no timers pending), then we return
 * immediately.
 */
    void
gui_mch_update(void)
{
    // This function is called extremely often.  It is tempting to do nothing
    // here to avoid reduced frame-rates but then it would not be possible to
    // interrupt Vim by presssing Ctrl-C during lengthy operations (e.g. after
    // entering "10gs" it would not be possible to bring Vim out of the 10 s
    // sleep prematurely).  As a compromise we check for Ctrl-C only once per
    // second.
    static CFAbsoluteTime lastTime = 0;

    CFAbsoluteTime nowTime = CFAbsoluteTimeGetCurrent();
    if (nowTime - lastTime > 1.0) {
        [[MMBackend sharedInstance] update];
        lastTime = nowTime;
    }
}


/* Flush any output to the screen */
    void
gui_mch_flush(void)
{
    // This function is called way too often to be useful as a hint for
    // flushing.  If we were to flush every time it was called the screen would
    // flicker.
}


/* Force flush output to MacVim.  Do not call this method unless absolutely
 * necessary. */
    void
gui_macvim_force_flush(void)
{
    [[MMBackend sharedInstance] flushQueue:YES];
}


/*
 * GUI input routine called by gui_wait_for_chars().  Waits for a character
 * from the keyboard.
 *  wtime == -1     Wait forever.
 *  wtime == 0      This should never happen.
 *  wtime > 0       Wait wtime milliseconds for a character.
 * Returns OK if a character was found to be available within the given time,
 * or FAIL otherwise.
 */
    int
gui_mch_wait_for_chars(int wtime)
{
    // NOTE! In all likelihood Vim will take a nap when waitForInput: is
    // called, so force a flush of the command queue here.
    [[MMBackend sharedInstance] flushQueue:YES];

    return [[MMBackend sharedInstance] waitForInput:wtime];
}


// -- Drawing ---------------------------------------------------------------


/*
 * Clear the whole text window.
 */
    void
gui_mch_clear_all(void)
{
    [[MMBackend sharedInstance] clearAll];
}


/*
 * Clear a rectangular region of the screen from text pos (row1, col1) to
 * (row2, col2) inclusive.
 */
    void
gui_mch_clear_block(int row1, int col1, int row2, int col2)
{
    [[MMBackend sharedInstance] clearBlockFromRow:row1 column:col1
                                                    toRow:row2 column:col2];
}


/*
 * Delete the given number of lines from the given row, scrolling up any
 * text further down within the scroll region.
 */
    void
gui_mch_delete_lines(int row, int num_lines)
{
    [[MMBackend sharedInstance] deleteLinesFromRow:row count:num_lines
            scrollBottom:gui.scroll_region_bot
                    left:gui.scroll_region_left
                   right:gui.scroll_region_right];
}


    void
gui_mch_draw_string(int row, int col, char_u *s, int len, int flags)
{
#ifdef FEAT_MBYTE
    char_u *conv_str = NULL;
    if (output_conv.vc_type != CONV_NONE) {
        conv_str = string_convert(&output_conv, s, &len);
        if (conv_str)
            s = conv_str;
    }
#endif

    [[MMBackend sharedInstance] drawString:(char*)s length:len row:row
                                    column:col cells:len flags:flags];

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


    int
gui_macvim_draw_string(int row, int col, char_u *s, int len, int flags)
{
    int c, cn, cl, i;
    int start = 0;
    int endcol = col;
    int startcol = col;
    BOOL wide = NO;
    MMBackend *backend = [MMBackend sharedInstance];
#ifdef FEAT_MBYTE
    char_u *conv_str = NULL;

    if (output_conv.vc_type != CONV_NONE) {
        conv_str = string_convert(&output_conv, s, &len);
        if (conv_str)
            s = conv_str;
    }
#endif

    // Loop over each character and output text when it changes from normal to
    // wide and vice versa.
    for (i = 0; i < len; i += cl) {
        c = utf_ptr2char(s + i);
        cn = utf_char2cells(c);
        cl = utf_ptr2len(s + i);
        if (0 == cl)
            len = i;    // len must be wrong (shouldn't happen)

        if (!utf_iscomposing(c)) {
            if ((cn > 1 && !wide) || (cn <= 1 && wide)) {
                // Changed from normal to wide or vice versa.
                [backend drawString:(char*)(s+start) length:i-start
                                   row:row column:startcol
                                 cells:endcol-startcol
                                 flags:(wide ? flags|DRAW_WIDE : flags)];

                start = i;
                startcol = endcol;
            }

            wide = cn > 1;
            endcol += cn;
        }
    }

    // Output remaining characters.
    [backend drawString:(char*)(s+start) length:len-start
                    row:row column:startcol cells:endcol-startcol
                  flags:(wide ? flags|DRAW_WIDE : flags)];

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

    return endcol - col;
}


/*
 * Insert the given number of lines before the given row, scrolling down any
 * following text within the scroll region.
 */
    void
gui_mch_insert_lines(int row, int num_lines)
{
    [[MMBackend sharedInstance] insertLinesFromRow:row count:num_lines
            scrollBottom:gui.scroll_region_bot
                    left:gui.scroll_region_left
                   right:gui.scroll_region_right];
}


/*
 * Set the current text foreground color.
 */
    void
gui_mch_set_fg_color(guicolor_T color)
{
    [[MMBackend sharedInstance] setForegroundColor:color];
}


/*
 * Set the current text background color.
 */
    void
gui_mch_set_bg_color(guicolor_T color)
{
    [[MMBackend sharedInstance] setBackgroundColor:color];
}


/*
 * Set the current text special color (used for underlines).
 */
    void
gui_mch_set_sp_color(guicolor_T color)
{
    [[MMBackend sharedInstance] setSpecialColor:color];
}


/*
 * Set default colors.
 */
    void
gui_mch_def_colors()
{
    MMBackend *backend = [MMBackend sharedInstance];

    // The default colors are taken from system values
    gui.def_norm_pixel = gui.norm_pixel = 
        [backend lookupColorWithKey:@"MacTextColor"];
    gui.def_back_pixel = gui.back_pixel = 
        [backend lookupColorWithKey:@"MacTextBackgroundColor"];
}


/*
 * Called when the foreground or background color has been changed.
 */
    void
gui_mch_new_colors(void)
{
    gui.def_back_pixel = gui.back_pixel;
    gui.def_norm_pixel = gui.norm_pixel;

    //NSLog(@"gui_mch_new_colors(back=%x, norm=%x)", gui.def_back_pixel,
    //        gui.def_norm_pixel);

    [[MMBackend sharedInstance]
        setDefaultColorsBackground:gui.def_back_pixel
                        foreground:gui.def_norm_pixel];
}

/*
 * Invert a rectangle from row r, column c, for nr rows and nc columns.
 */
    void
gui_mch_invert_rectangle(int r, int c, int nr, int nc, int invert)
{
    [[MMBackend sharedInstance] drawInvertedRectAtRow:r column:c numRows:nr
            numColumns:nc invert:invert];
}



// -- Tabline ---------------------------------------------------------------


/*
 * Set the current tab to "nr".  First tab is 1.
 */
    void
gui_mch_set_curtab(int nr)
{
    [[MMBackend sharedInstance] selectTab:nr];
}


/*
 * Return TRUE when tabline is displayed.
 */
    int
gui_mch_showing_tabline(void)
{
    return [[MMBackend sharedInstance] tabBarVisible];
}

/*
 * Update the labels of the tabline.
 */
    void
gui_mch_update_tabline(void)
{
    [[MMBackend sharedInstance] updateTabBar];
}

/*
 * Show or hide the tabline.
 */
    void
gui_mch_show_tabline(int showit)
{
    [[MMBackend sharedInstance] showTabBar:showit];
}


// -- Clipboard -------------------------------------------------------------


    void
clip_mch_lose_selection(VimClipboard *cbd)
{
}


    int
clip_mch_own_selection(VimClipboard *cbd)
{
    return 0;
}


    void
clip_mch_request_selection(VimClipboard *cbd)
{
    NSPasteboard *pb = [NSPasteboard generalPasteboard];
    NSArray *supportedTypes = [NSArray arrayWithObjects:VimPBoardType,
            NSStringPboardType, nil];
    NSString *bestType = [pb availableTypeFromArray:supportedTypes];
    if (!bestType) return;

    int motion_type = MCHAR;
    NSString *string = nil;

    if ([bestType isEqual:VimPBoardType]) {
        // This type should consist of an array with two objects:
        //   1. motion type (NSNumber)
        //   2. text (NSString)
        // If this is not the case we fall back on using NSStringPboardType.
        id plist = [pb propertyListForType:VimPBoardType];
        if ([plist isKindOfClass:[NSArray class]] && [plist count] == 2) {
            id obj = [plist objectAtIndex:1];
            if ([obj isKindOfClass:[NSString class]]) {
                motion_type = [[plist objectAtIndex:0] intValue];
                string = obj;
            }
        }
    }

    if (!string) {
        // Use NSStringPboardType.  The motion type is set to line-wise if the
        // string contains at least one EOL character, otherwise it is set to
        // character-wise (block-wise is never used).
        NSMutableString *mstring =
                [[pb stringForType:NSStringPboardType] mutableCopy];
        if (!mstring) return;

        // Replace unrecognized end-of-line sequences with \x0a (line feed).
        NSRange range = { 0, [mstring length] };
        unsigned n = [mstring replaceOccurrencesOfString:@"\x0d\x0a"
                                             withString:@"\x0a" options:0
                                                  range:range];
        if (0 == n) {
            n = [mstring replaceOccurrencesOfString:@"\x0d" withString:@"\x0a"
                                           options:0 range:range];
        }
        
        // Scan for newline character to decide whether the string should be
        // pasted line-wise or character-wise.
        motion_type = MCHAR;
        if (0 < n || NSNotFound != [mstring rangeOfString:@"\n"].location)
            motion_type = MLINE;

        string = mstring;
    }

    if (!(MCHAR == motion_type || MLINE == motion_type || MBLOCK == motion_type
            || MAUTO == motion_type))
        motion_type = MCHAR;

    char_u *str = (char_u*)[string UTF8String];
    int len = [string lengthOfBytesUsingEncoding:NSUTF8StringEncoding];

#ifdef FEAT_MBYTE
    if (input_conv.vc_type != CONV_NONE)
        str = string_convert(&input_conv, str, &len);
#endif

    if (str)
        clip_yank_selection(motion_type, str, len, cbd);

#ifdef FEAT_MBYTE
    if (input_conv.vc_type != CONV_NONE)
        vim_free(str);
#endif
}


/*
 * Send the current selection to the clipboard.
 */
    void
clip_mch_set_selection(VimClipboard *cbd)
{
    // If the '*' register isn't already filled in, fill it in now.
    cbd->owned = TRUE;
    clip_get_selection(cbd);
    cbd->owned = FALSE;
    
    // Get the text to put on the pasteboard.
    long_u llen = 0; char_u *str = 0;
    int motion_type = clip_convert_selection(&str, &llen, cbd);
    if (motion_type < 0)
        return;

    // 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

    if (len > 0) {
        NSString *string = [[NSString alloc]
            initWithBytes:str length:len encoding:NSUTF8StringEncoding];

        // See clip_mch_request_selection() for info on pasteboard types.
        NSPasteboard *pb = [NSPasteboard generalPasteboard];
        NSArray *supportedTypes = [NSArray arrayWithObjects:VimPBoardType,
                NSStringPboardType, nil];
        [pb declareTypes:supportedTypes owner:nil];

        NSNumber *motion = [NSNumber numberWithInt:motion_type];
        NSArray *plist = [NSArray arrayWithObjects:motion, string, nil];
        [pb setPropertyList:plist forType:VimPBoardType];

        [pb setString:string forType:NSStringPboardType];
        
        [string release];
    }

    vim_free(str);
}


// -- Menu ------------------------------------------------------------------


/*
 * A menu descriptor represents the "address" of a menu as an array of strings.
 * E.g. the menu "File->Close" has descriptor { "File", "Close" }.
 */
    NSArray *
descriptor_for_menu(vimmenu_T *menu)
{
    if (!menu) return nil;

    NSMutableArray *desc = [NSMutableArray array];
    while (menu) {
        NSString *name = [NSString stringWithVimString:menu->dname];
        [desc insertObject:name atIndex:0];
        menu = menu->parent;
    }

    return desc;
}

    vimmenu_T *
menu_for_descriptor(NSArray *desc)
{
    if (!(desc && [desc count] > 0)) return NULL;

    vimmenu_T *menu = root_menu;
    int i, count = [desc count];

    for (i = 0; i < count; ++i) {
        NSString *component = [desc objectAtIndex:i];
        while (menu) {
            NSString *name = [NSString stringWithVimString:menu->dname];
            if ([component isEqual:name]) {
                if (i+1 == count)
                    return menu;    // Matched all components, so return menu
                menu = menu->children;
                break;
            }
            menu = menu->next;
        }
    }

    return NULL;
}

/*
 * Add a submenu to the menu bar, toolbar, or a popup menu.
 */
    void
gui_mch_add_menu(vimmenu_T *menu, int idx)
{
    NSArray *desc = descriptor_for_menu(menu);
    [[MMBackend sharedInstance] queueMessage:AddMenuMsgID properties:
        [NSDictionary dictionaryWithObjectsAndKeys:
            desc, @"descriptor",
            [NSNumber numberWithInt:idx], @"index",
            nil]];
}


/*
 * Add a menu item to a menu
 */
    void
gui_mch_add_menu_item(vimmenu_T *menu, int idx)
{
    char_u *tip = menu->strings[MENU_INDEX_TIP]
            ? menu->strings[MENU_INDEX_TIP] : menu->actext;
    NSArray *desc = descriptor_for_menu(menu);
    NSString *keyEquivalent = menu->mac_key
        ? [NSString stringWithFormat:@"%C", specialKeyToNSKey(menu->mac_key)]
        : [NSString string];
    int modifierMask = vimModMaskToEventModifierFlags(menu->mac_mods);
    char_u *icon = NULL;

    if (menu_is_toolbar(menu->parent->name)) {
        char_u fname[MAXPATHL];

        // TODO: Ensure menu->iconfile exists (if != NULL)
        icon = menu->iconfile;
        if (!icon && gui_find_bitmap(menu->name, fname, "bmp") == OK)
            icon = fname;
        if (!icon && menu->iconidx >= 0)
            icon = menu->dname;
    }

    [[MMBackend sharedInstance] queueMessage:AddMenuItemMsgID properties:
        [NSDictionary dictionaryWithObjectsAndKeys:
            desc, @"descriptor",
            [NSNumber numberWithInt:idx], @"index",
            [NSString stringWithVimString:tip], @"tip",
            [NSString stringWithVimString:icon], @"icon",
            keyEquivalent, @"keyEquivalent",
            [NSNumber numberWithInt:modifierMask], @"modifierMask",
            [NSString stringWithVimString:menu->mac_action], @"action",
            [NSNumber numberWithBool:menu->mac_alternate], @"isAlternate",
            nil]];
}


/*
 * Destroy the machine specific menu widget.
 */
    void
gui_mch_destroy_menu(vimmenu_T *menu)
{
    NSArray *desc = descriptor_for_menu(menu);
    [[MMBackend sharedInstance] queueMessage:RemoveMenuItemMsgID properties:
        [NSDictionary dictionaryWithObject:desc forKey:@"descriptor"]];
}


/*
 * Make a menu either grey or not grey.
 */
    void
gui_mch_menu_grey(vimmenu_T *menu, int grey)
{
    /* Only update menu if the 'grey' state has changed to avoid having to pass
     * lots of unnecessary data to MacVim.  (Skipping this test makes MacVim
     * pause noticably on mode changes. */
    NSArray *desc = descriptor_for_menu(menu);
    if (menu->was_grey == grey)
        return;

    menu->was_grey = grey;

    [[MMBackend sharedInstance] queueMessage:EnableMenuItemMsgID properties:
        [NSDictionary dictionaryWithObjectsAndKeys:
            desc, @"descriptor",
            [NSNumber numberWithInt:!grey], @"enable",
            nil]];
}


/*
 * Make menu item hidden or not hidden
 */
    void
gui_mch_menu_hidden(vimmenu_T *menu, int hidden)
{
    // HACK! There is no (obvious) way to hide a menu item, so simply
    // enable/disable it instead.
    gui_mch_menu_grey(menu, hidden);
}


/*
 * This is called when user right clicks.
 */
    void
gui_mch_show_popupmenu(vimmenu_T *menu)
{
    NSArray *desc = descriptor_for_menu(menu);
    [[MMBackend sharedInstance] queueMessage:ShowPopupMenuMsgID properties:
        [NSDictionary dictionaryWithObject:desc forKey:@"descriptor"]];
}


/*
 * This is called when a :popup command is executed.
 */
    void
gui_make_popup(char_u *path_name, int mouse_pos)
{
    vimmenu_T *menu = gui_find_menu(path_name);
    if (!(menu && menu->children)) return;

    NSArray *desc = descriptor_for_menu(menu);
    NSDictionary *p = (mouse_pos || NULL == curwin)
        ? [NSDictionary dictionaryWithObject:desc forKey:@"descriptor"]
        : [NSDictionary dictionaryWithObjectsAndKeys:
            desc, @"descriptor",
            [NSNumber numberWithInt:curwin->w_wrow], @"row",
            [NSNumber numberWithInt:curwin->w_wcol], @"column",
            nil];

    [[MMBackend sharedInstance] queueMessage:ShowPopupMenuMsgID properties:p];
}


/*
 * This is called after setting all the menus to grey/hidden or not.
 */
    void
gui_mch_draw_menubar(void)
{
    // The (main) menu draws itself in Mac OS X.
}


    void
gui_mch_enable_menu(int flag)
{
    // The (main) menu is always enabled in Mac OS X.
}


#if 0
    void
gui_mch_set_menu_pos(int x, int y, int w, int h)
{
    // The (main) menu cannot be moved in Mac OS X.
}
#endif


    void
gui_mch_show_toolbar(int showit)
{
    int flags = 0;
    if (toolbar_flags & TOOLBAR_TEXT) flags |= ToolbarLabelFlag;
    if (toolbar_flags & TOOLBAR_ICONS) flags |= ToolbarIconFlag;
    if (tbis_flags & (TBIS_MEDIUM|TBIS_LARGE)) flags |= ToolbarSizeRegularFlag;

    [[MMBackend sharedInstance] showToolbar:showit flags:flags];
}




// -- Fonts -----------------------------------------------------------------


/*
 * If a font is not going to be used, free its structure.
 */
    void
gui_mch_free_font(font)
    GuiFont     font;
{
    if (font != NOFONT) {
        //NSLog(@"gui_mch_free_font(font=0x%x)", font);
        [(NSFont*)font release];
    }
}


/*
 * Get a font structure for highlighting.
 */
    GuiFont
gui_mch_get_font(char_u *name, int giveErrorIfMissing)
{
    //NSLog(@"gui_mch_get_font(name=%s, giveErrorIfMissing=%d)", name,
    //        giveErrorIfMissing);

    NSFont *font = gui_macvim_font_with_name(name);
    if (font)
        return (GuiFont)[font retain];

    if (giveErrorIfMissing)
        EMSG2(_(e_font), name);

    return NOFONT;
}


#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Return the name of font "font" in allocated memory.
 * Don't know how to get the actual name, thus use the provided name.
 */
    char_u *
gui_mch_get_fontname(GuiFont font, char_u *name)
{
    if (name == NULL)
        return NULL;
    return vim_strsave(name);
}
#endif


/*
 * Initialise vim to use the font with the given name.  Return FAIL if the font
 * could not be loaded, OK otherwise.
 */
    int
gui_mch_init_font(char_u *font_name, int fontset)
{
    //NSLog(@"gui_mch_init_font(font_name=%s, fontset=%d)", font_name, fontset);

    if (font_name && STRCMP(font_name, "*") == 0) {
        // :set gfn=* shows the font panel.
        do_cmdline_cmd((char_u*)":macaction orderFrontFontPanel:");
        return FAIL;
    }

    NSFont *font = gui_macvim_font_with_name(font_name);
    if (font) {
        [(NSFont*)gui.norm_font release];
        gui.norm_font = (GuiFont)[font retain];

        // NOTE: MacVim keeps separate track of the normal and wide fonts.
        // Unless the user changes 'guifontwide' manually, they are based on
        // the same (normal) font.  Also note that each time the normal font is
        // set, the advancement may change so the wide font needs to be updated
        // as well (so that it is always twice the width of the normal font).
        [[MMBackend sharedInstance] setFont:font];
        [[MMBackend sharedInstance] setWideFont:
               (NOFONT == gui.wide_font ? font : (NSFont*)gui.wide_font)];

        return OK;
    }

    return FAIL;
}


/*
 * Set the current text font.
 */
    void
gui_mch_set_font(GuiFont font)
{
    // Font selection is done inside MacVim...nothing here to do.
}


    NSFont *
gui_macvim_font_with_name(char_u *name)
{
    NSFont *font = nil;
    NSString *fontName = MMDefaultFontName;
    float size = MMDefaultFontSize;
    BOOL parseFailed = NO;

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

    if (name) {
        fontName = [NSString stringWithUTF8String:(char*)name];

        NSArray *components = [fontName componentsSeparatedByString:@":"];
        if ([components count] == 2) {
            NSString *sizeString = [components lastObject];
            if ([sizeString length] > 0
                    && [sizeString characterAtIndex:0] == 'h') {
                sizeString = [sizeString substringFromIndex:1];
                if ([sizeString length] > 0) {
                    size = [sizeString floatValue];
                    fontName = [components objectAtIndex:0];
                }
            } else {
                parseFailed = YES;
            }
        } else if ([components count] > 2) {
            parseFailed = YES;
        }

        if (!parseFailed) {
            // Replace underscores with spaces.
            fontName = [[fontName componentsSeparatedByString:@"_"]
                                     componentsJoinedByString:@" "];
        }
    }

    if (!parseFailed && [fontName length] > 0) {
        if (size < MMMinFontSize) size = MMMinFontSize;
        if (size > MMMaxFontSize) size = MMMaxFontSize;

        font = [NSFont fontWithName:fontName size:size];

        if (!font && MMDefaultFontName == fontName) {
            // If for some reason the MacVim default font is not in the app
            // bundle, then fall back on the system default font.
            font = [NSFont userFixedPitchFontOfSize:0];
        }
    }

#ifdef FEAT_MBYTE
    CONVERT_TO_UTF8_FREE(name);
#endif

    return font;
}

// -- Scrollbars ------------------------------------------------------------


    void
gui_mch_create_scrollbar(
        scrollbar_T *sb,
        int orient)     /* SBAR_VERT or SBAR_HORIZ */
{
    [[MMBackend sharedInstance] 
            createScrollbarWithIdentifier:sb->ident type:sb->type];
}


    void
gui_mch_destroy_scrollbar(scrollbar_T *sb)
{
    [[MMBackend sharedInstance] 
            destroyScrollbarWithIdentifier:sb->ident];
}


    void
gui_mch_enable_scrollbar(
        scrollbar_T     *sb,
        int             flag)
{
    [[MMBackend sharedInstance] 
            showScrollbarWithIdentifier:sb->ident state:flag];
}


    void
gui_mch_set_scrollbar_pos(
        scrollbar_T *sb,
        int x,
        int y,
        int w,
        int h)
{
    int pos = y;
    int len = h;
    if (SBAR_BOTTOM == sb->type) {
        pos = x;
        len = w; 
    }

    [[MMBackend sharedInstance] 
            setScrollbarPosition:pos length:len identifier:sb->ident];
}


    void
gui_mch_set_scrollbar_thumb(
        scrollbar_T *sb,
        long val,
        long size,
        long max)
{
    [[MMBackend sharedInstance] 
            setScrollbarThumbValue:val size:size max:max identifier:sb->ident];
}


// -- Cursor ----------------------------------------------------------------


/*
 * Draw a cursor without focus.
 */
    void
gui_mch_draw_hollow_cursor(guicolor_T color)
{
    return [[MMBackend sharedInstance]
        drawCursorAtRow:gui.row column:gui.col shape:MMInsertionPointHollow
               fraction:100 color:color];
}


/*
 * Draw part of a cursor, only w pixels wide, and h pixels high.
 */
    void
gui_mch_draw_part_cursor(int w, int h, guicolor_T color)
{
    // HACK!  'w' and 'h' are always 1 since we do not tell Vim about the exact
    // font dimensions.  Thus these parameters are useless.  Instead we look at
    // the shape_table to determine the shape and size of the cursor (just like
    // gui_update_cursor() does).

#ifdef FEAT_RIGHTLEFT
    // If 'rl' is set the insert mode cursor must be drawn on the right-hand
    // side of a text cell.
    int rl = curwin ? curwin->w_p_rl : FALSE;
#else
    int rl = FALSE;
#endif
    int idx = get_shape_idx(FALSE);
    int shape = MMInsertionPointBlock;
    switch (shape_table[idx].shape) {
        case SHAPE_HOR:
            shape = MMInsertionPointHorizontal;
            break;
        case SHAPE_VER:
            shape = rl ? MMInsertionPointVerticalRight
                       : MMInsertionPointVertical;
            break;
    }

    return [[MMBackend sharedInstance]
        drawCursorAtRow:gui.row column:gui.col shape:shape
               fraction:shape_table[idx].percentage color:color];
}


/*
 * Cursor blink functions.
 *
 * This is a simple state machine:
 * BLINK_NONE   not blinking at all
 * BLINK_OFF    blinking, cursor is not shown
 * BLINK_ON blinking, cursor is shown
 */
    void
gui_mch_set_blinking(long wait, long on, long off)
{
    [[MMBackend sharedInstance] setBlinkWait:wait on:on off:off];
}


/*
 * Start the cursor blinking.  If it was already blinking, this restarts the
 * waiting time and shows the cursor.
 */
    void
gui_mch_start_blink(void)
{
    [[MMBackend sharedInstance] startBlink];
}


/*
 * Stop the cursor blinking.  Show the cursor if it wasn't shown.
 */
    void
gui_mch_stop_blink(void)
{
    [[MMBackend sharedInstance] stopBlink];
}


// -- Mouse -----------------------------------------------------------------


/*
 * Get current mouse coordinates in text window.
 */
    void
gui_mch_getmouse(int *x, int *y)
{
    //NSLog(@"gui_mch_getmouse()");
}


    void
gui_mch_setmouse(int x, int y)
{
    //NSLog(@"gui_mch_setmouse(x=%d, y=%d)", x, y);
}


    void
mch_set_mouse_shape(int shape)
{
    [[MMBackend sharedInstance] setMouseShape:shape];
}




// -- Input Method ----------------------------------------------------------

#if defined(USE_IM_CONTROL)

    void
im_set_position(int row, int col)
{
    // The pre-edit area is a popup window which is displayed by MMTextView.
    [[MMBackend sharedInstance] setPreEditRow:row column:col];
}


    void
im_set_active(int active)
{
    // Set roman or the system script if 'active' is TRUE or FALSE,
    // respectively.
    SInt32 systemScript = GetScriptManagerVariable(smSysScript);

    if (!p_imdisable && smRoman != systemScript)
        KeyScript(active ? smKeySysScript : smKeyRoman);
}


    int
im_get_status(void)
{
    // IM is active whenever the current script is the system script and the
    // system script isn't roman.  (Hence IM can only be active when using
    // non-roman scripts.)
    SInt32 currentScript = GetScriptManagerVariable(smKeyScript);
    SInt32 systemScript = GetScriptManagerVariable(smSysScript);

    return currentScript != smRoman && currentScript == systemScript;
}

#endif // defined(USE_IM_CONTROL)




// -- Find & Replace dialog -------------------------------------------------

#ifdef FIND_REPLACE_DIALOG

    static void
macvim_find_and_replace(char_u *arg, BOOL replace)
{
    // TODO: Specialized dialog for find without replace?
    int wholeWord = FALSE;
    int matchCase = !p_ic;
    char_u *text  = get_find_dialog_text(arg, &wholeWord, &matchCase);

    int flags = 0;
    if (wholeWord) flags |= FRD_WHOLE_WORD;
    if (matchCase) flags |= FRD_MATCH_CASE;

    NSDictionary *args = [NSDictionary dictionaryWithObjectsAndKeys:
            [NSString stringWithVimString:text],    @"text",
            [NSNumber numberWithInt:flags],         @"flags",
            nil];

    [[MMBackend sharedInstance] queueMessage:ShowFindReplaceDialogMsgID
                                  properties:args];
}

    void
gui_mch_find_dialog(exarg_T *eap)
{
    macvim_find_and_replace(eap->arg, NO);
}

    void
gui_mch_replace_dialog(exarg_T *eap)
{
    macvim_find_and_replace(eap->arg, YES);
}

#endif // FIND_REPLACE_DIALOG




// -- Unsorted --------------------------------------------------------------


    void
ex_macaction(eap)
    exarg_T     *eap;
{
    if (!gui.in_use) {
        EMSG(_("E???: Command only available in GUI mode"));
        return;
    }

    char_u *arg = eap->arg;
#ifdef FEAT_MBYTE
    arg = CONVERT_TO_UTF8(arg);
#endif

    NSDictionary *actionDict = [[MMBackend sharedInstance] actionDict];
    NSString *name = [NSString stringWithUTF8String:(char*)arg];
    if (actionDict && [actionDict objectForKey:name] != nil) {
        [[MMBackend sharedInstance] executeActionWithName:name];
    } else {
        EMSG2(_("E???: Invalid action: %s"), eap->arg);
    }

#ifdef FEAT_MBYTE
    arg = CONVERT_TO_UTF8(arg);
#endif
}


/*
 * Adjust gui.char_height (after 'linespace' was changed).
 */
    int
gui_mch_adjust_charheight(void)
{
    [[MMBackend sharedInstance] adjustLinespace:p_linespace];
    return OK;
}


    void
gui_mch_beep(void)
{
    NSBeep();
}



#ifdef FEAT_BROWSE
/*
 * Pop open a file browser and return the file selected, in allocated memory,
 * or NULL if Cancel is hit.
 *  saving  - TRUE if the file will be saved to, FALSE if it will be opened.
 *  title   - Title message for the file browser dialog.
 *  dflt    - Default name of file.
 *  ext     - Default extension to be added to files without extensions.
 *  initdir - directory in which to open the browser (NULL = current dir)
 *  filter  - Filter for matched files to choose from.
 *  Has a format like this:
 *  "C Files (*.c)\0*.c\0"
 *  "All Files\0*.*\0\0"
 *  If these two strings were concatenated, then a choice of two file
 *  filters will be selectable to the user.  Then only matching files will
 *  be shown in the browser.  If NULL, the default allows all files.
 *
 *  *NOTE* - the filter string must be terminated with TWO nulls.
 */
    char_u *
gui_mch_browse(
    int saving,
    char_u *title,
    char_u *dflt,
    char_u *ext,
    char_u *initdir,
    char_u *filter)
{
    //NSLog(@"gui_mch_browse(saving=%d, title=%s, dflt=%s, ext=%s, initdir=%s,"
    //        " filter=%s", saving, title, dflt, ext, initdir, filter);

    // Ensure no data is on the output queue before presenting the dialog.
    gui_macvim_force_flush();

    NSMutableDictionary *attr = [NSMutableDictionary
        dictionaryWithObject:[NSNumber numberWithBool:saving]
                      forKey:@"saving"];
    if (initdir)
        [attr setObject:[NSString stringWithVimString:initdir] forKey:@"dir"];

    char_u *s = (char_u*)[[MMBackend sharedInstance]
                            browseForFileWithAttributes:attr];

    return s;
}
#endif /* FEAT_BROWSE */



    int
gui_mch_dialog(
    int         type,
    char_u      *title,
    char_u      *message,
    char_u      *buttons,
    int         dfltbutton,
    char_u      *textfield)
{
    //NSLog(@"gui_mch_dialog(type=%d title=%s message=%s buttons=%s "
    //        "dfltbutton=%d textfield=%s)", type, title, message, buttons,
    //        dfltbutton, textfield);

    // Ensure no data is on the output queue before presenting the dialog.
    gui_macvim_force_flush();

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

    NSMutableDictionary *attr = [NSMutableDictionary
                        dictionaryWithObject:[NSNumber numberWithInt:style]
                                      forKey:@"alertStyle"];

    if (buttons) {
        // 'buttons' is a string of '\n'-separated button titles 
        NSString *string = [NSString stringWithVimString:buttons];
        NSArray *array = [string componentsSeparatedByString:@"\n"];
        [attr setObject:array forKey:@"buttonTitles"];
    }

    NSString *messageText = nil;
    if (title)
        messageText = [NSString stringWithVimString:title];

    if (message) {
        NSString *informativeText = [NSString stringWithVimString:message];
        if (!messageText) {
            // 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 = [informativeText rangeOfString:@"\n\n"];
            if (NSNotFound == eolRange.location)
                eolRange = [informativeText rangeOfString:@"\n"];
            if (NSNotFound != eolRange.location) {
                messageText = [informativeText substringToIndex:
                                                        eolRange.location];
                informativeText = [informativeText substringFromIndex:
                                                        NSMaxRange(eolRange)];
            }
        }

        [attr setObject:informativeText forKey:@"informativeText"];
    }

    if (messageText)
        [attr setObject:messageText forKey:@"messageText"];

    if (textfield) {
        NSString *string = [NSString stringWithVimString:textfield];
        [attr setObject:string forKey:@"textFieldString"];
    }

    return [[MMBackend sharedInstance] showDialogWithAttributes:attr
                                                    textField:(char*)textfield];
}


    void
gui_mch_flash(int msec)
{
}


/*
 * Return the Pixel value (color) for the given color name.  This routine was
 * pretty much taken from example code in the Silicon Graphics OSF/Motif
 * Programmer's Guide.
 * Return INVALCOLOR when failed.
 */
    guicolor_T
gui_mch_get_color(char_u *name)
{
#ifdef FEAT_MBYTE
    name = CONVERT_TO_UTF8(name);
#endif

    NSString *key = [NSString stringWithUTF8String:(char*)name];
    guicolor_T col = [[MMBackend sharedInstance] lookupColorWithKey:key];

#ifdef FEAT_MBYTE
    CONVERT_TO_UTF8_FREE(name);
#endif

    return col;
}


/*
 * Return the RGB value of a pixel as long.
 */
    long_u
gui_mch_get_rgb(guicolor_T pixel)
{
    // This is only implemented so that vim can guess the correct value for
    // 'background' (which otherwise defaults to 'dark'); it is not used for
    // anything else (as far as I know).
    // The implementation is simple since colors are stored in an int as
    // "rrggbb".
    return pixel;
}


/*
 * Get the screen dimensions.
 * Allow 10 pixels for horizontal borders, 40 for vertical borders.
 * Is there no way to find out how wide the borders really are?
 * TODO: Add live udate of those value on suspend/resume.
 */
    void
gui_mch_get_screen_dimensions(int *screen_w, int *screen_h)
{
    //NSLog(@"gui_mch_get_screen_dimensions()");
    *screen_w = Columns;
    *screen_h = Rows;
}


/*
 * Get the position of the top left corner of the window.
 */
    int
gui_mch_get_winpos(int *x, int *y)
{
    *x = *y = 0;
    return OK;
}


/*
 * Return OK if the key with the termcap name "name" is supported.
 */
    int
gui_mch_haskey(char_u *name)
{
    BOOL ok = NO;

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

    NSString *value = [NSString stringWithUTF8String:(char*)name];
    if (value)
        ok =  [[MMBackend sharedInstance] hasSpecialKeyWithValue:value];

#ifdef FEAT_MBYTE
    CONVERT_TO_UTF8_FREE(name);
#endif

    return ok;
}


/*
 * Iconify the GUI window.
 */
    void
gui_mch_iconify(void)
{
}


#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Bring the Vim window to the foreground.
 */
    void
gui_mch_set_foreground(void)
{
    [[MMBackend sharedInstance] activate];
}
#endif



    void
gui_mch_set_shellsize(
    int         width,
    int         height,
    int         min_width,
    int         min_height,
    int         base_width,
    int         base_height,
    int         direction)
{
    //NSLog(@"gui_mch_set_shellsize(width=%d, height=%d, min_width=%d,"
    //        " min_height=%d, base_width=%d, base_height=%d, direction=%d)",
    //        width, height, min_width, min_height, base_width, base_height,
    //        direction);
    [[MMBackend sharedInstance] setRows:height columns:width];
}


    void
gui_mch_set_text_area_pos(int x, int y, int w, int h)
{
}

/*
 * Set the position of the top left corner of the window to the given
 * coordinates.
 */
    void
gui_mch_set_winpos(int x, int y)
{
}


#ifdef FEAT_TITLE
/*
 * Set the window title and icon.
 * (The icon is not taken care of).
 */
    void
gui_mch_settitle(char_u *title, char_u *icon)
{
    //NSLog(@"gui_mch_settitle(title=%s, icon=%s)", title, icon);

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

    MMBackend *backend = [MMBackend sharedInstance];
    [backend setWindowTitle:(char*)title];

    // TODO: Convert filename to UTF-8?
    if (curbuf)
        [backend setDocumentFilename:(char*)curbuf->b_ffname];

#ifdef FEAT_MBYTE
    CONVERT_TO_UTF8_FREE(title);
#endif
}
#endif


    void
gui_mch_toggle_tearoffs(int enable)
{
}



    void
gui_mch_enter_fullscreen(int fuoptions_flags, guicolor_T bg)
{
    [[MMBackend sharedInstance] enterFullscreen:fuoptions_flags background:bg];
}


    void
gui_mch_leave_fullscreen()
{
    [[MMBackend sharedInstance] leaveFullscreen];
}


    void
gui_mch_fuopt_update()
{
    guicolor_T fg, bg;
    if (fuoptions_flags & FUOPT_BGCOLOR_HLGROUP) {
        syn_id2colors(fuoptions_bgcolor, &fg, &bg);
    } else {
        bg = fuoptions_bgcolor;
    }

    [[MMBackend sharedInstance] setFullscreenBackgroundColor:bg];
}


    void
gui_macvim_update_modified_flag()
{
    [[MMBackend sharedInstance] updateModifiedFlag];
}

/*
 * Add search pattern 'pat' to the OS X find pasteboard.  This allows other
 * apps access the last pattern searched for (hitting <D-g> in another app will
 * initiate a search for the same pattern).
 */
    void
gui_macvim_add_to_find_pboard(char_u *pat)
{
    if (!pat) return;

#ifdef FEAT_MBYTE
    pat = CONVERT_TO_UTF8(pat);
#endif
    NSString *s = [NSString stringWithUTF8String:(char*)pat];
#ifdef FEAT_MBYTE
    CONVERT_TO_UTF8_FREE(pat);
#endif

    if (!s) return;

    NSPasteboard *pb = [NSPasteboard pasteboardWithName:NSFindPboard];
    [pb declareTypes:[NSArray arrayWithObject:NSStringPboardType] owner:nil];
    [pb setString:s forType:NSStringPboardType];
}

    void
gui_macvim_set_antialias(int antialias)
{
    [[MMBackend sharedInstance] setAntialias:antialias];
}


    void
gui_macvim_wait_for_startup()
{
    MMBackend *backend = [MMBackend sharedInstance];
    if ([backend waitForAck])
        [backend waitForConnectionAcknowledgement];
}

void gui_macvim_get_window_layout(int *count, int *layout)
{
    if (!(count && layout)) return;

    // NOTE: Only set 'layout' if the backend has requested a != 0 layout, else
    // any command line arguments (-p/-o) would be ignored.
    int window_layout = [[MMBackend sharedInstance] initialWindowLayout];
    if (window_layout > 0 && window_layout < 4) {
        // The window_layout numbers must match the WIN_* defines in main.c.
        *count = 0;
        *layout = window_layout;
    }
}


// -- Client/Server ---------------------------------------------------------

#ifdef MAC_CLIENTSERVER

//
// NOTE: Client/Server is only fully supported with a GUI.  Theoretically it
// would be possible to make the server code work with terminal Vim, but it
// would require that a run-loop is set up and checked.  This should not be
// difficult to implement, simply call gui_mch_update() at opportune moments
// and it will take care of the run-loop.  Another (bigger) problem with
// supporting servers in terminal mode is that the server listing code talks to
// MacVim (the GUI) to figure out which servers are running.
//


/*
 * Register connection with 'name'.  The actual connection is named something
 * like 'org.vim.MacVim.VIM3', whereas the server is called 'VIM3'.
 */
    void
serverRegisterName(char_u *name)
{
#ifdef FEAT_MBYTE
    name = CONVERT_TO_UTF8(name);
#endif

    NSString *svrName = [NSString stringWithUTF8String:(char*)name];
    [[MMBackend sharedInstance] registerServerWithName:svrName];

#ifdef FEAT_MBYTE
    CONVERT_TO_UTF8_FREE(name);
#endif
}


/*
 * Send to an instance of Vim.
 * Returns 0 for OK, negative for an error.
 */
    int
serverSendToVim(char_u *name, char_u *cmd, char_u **result,
        int *port, int asExpr, int silent)
{
#ifdef FEAT_MBYTE
    name = CONVERT_TO_UTF8(name);
    cmd = CONVERT_TO_UTF8(cmd);
#endif

    BOOL ok = [[MMBackend sharedInstance]
            sendToServer:[NSString stringWithUTF8String:(char*)name]
                  string:[NSString stringWithUTF8String:(char*)cmd]
                   reply:result
                    port:port
              expression:asExpr
                  silent:silent];

#ifdef FEAT_MBYTE
    CONVERT_TO_UTF8_FREE(name);
    CONVERT_TO_UTF8_FREE(cmd);
#endif

    return ok ? 0 : -1;
}


/*
 * Ask MacVim for the names of all Vim servers.
 */
    char_u *
serverGetVimNames(void)
{
    char_u *names = NULL;
    NSArray *list = [[MMBackend sharedInstance] serverList];

    if (list) {
        NSString *string = [list componentsJoinedByString:@"\n"];
        names = [string vimStringSave];
    }

    return names;
}


/*
 * 'str' is a hex int representing the send port of the connection.
 */
    int
serverStrToPort(char_u *str)
{
    int port = 0;

    sscanf((char *)str, "0x%x", &port);
    if (!port)
        EMSG2(_("E573: Invalid server id used: %s"), str);

    return port;
}


/*
 * Check for replies from server with send port 'port'.
 * Return TRUE and a non-malloc'ed string if there is.  Else return FALSE.
 */
    int
serverPeekReply(int port, char_u **str)
{
    NSString *reply = [[MMBackend sharedInstance] peekForReplyOnPort:port];
    int len = [reply lengthOfBytesUsingEncoding:NSUTF8StringEncoding];

    if (str && len > 0) {
        *str = (char_u*)[reply UTF8String];

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

            if (len > 0) {
                // HACK! Since 's' needs to be freed we cannot simply set
                // '*str = s' or memory will leak.  Instead, create a dummy
                // NSData and return its 'bytes' pointer, then autorelease the
                // NSData.
                NSData *data = [NSData dataWithBytes:s length:len+1];
                *str = (char_u*)[data bytes];
            }

            vim_free(s);
        }
#endif
    }

    return reply != nil;
}


/*
 * Wait for replies from server with send port 'port'.
 * Return 0 and the malloc'ed string when a reply is available.
 * Return -1 on error.
 */
    int
serverReadReply(int port, char_u **str)
{
    NSString *reply = [[MMBackend sharedInstance] waitForReplyOnPort:port];
    if (reply && str) {
        *str = [reply vimStringSave];
        return 0;
    }

    return -1;
}


/*
 * Send a reply string (notification) to client with port given by "serverid".
 * Return -1 if the window is invalid.
 */
    int
serverSendReply(char_u *serverid, char_u *reply)
{
    int retval = -1;
    int port = serverStrToPort(serverid);
    if (port > 0 && reply) {
#ifdef FEAT_MBYTE
        reply = CONVERT_TO_UTF8(reply);
#endif
        BOOL ok = [[MMBackend sharedInstance]
                sendReply:[NSString stringWithUTF8String:(char*)reply]
                   toPort:port];
        retval = ok ? 0 : -1;
#ifdef FEAT_MBYTE
        CONVERT_TO_UTF8_FREE(reply);
#endif
    }

    return retval;
}

#endif // MAC_CLIENTSERVER




// -- ODB Editor Support ----------------------------------------------------

#ifdef FEAT_ODB_EDITOR
/*
 * The ODB Editor protocol works like this:
 * - An external program (the server) asks MacVim to open a file and associates
 *   three things with this file: (1) a server id (a four character code that
 *   identifies the server), (2) a path that can be used as window title for
 *   the file (optional), (3) an arbitrary token (optional)
 * - When a file is saved or closed, MacVim should tell the server about which
 *   file was modified and also pass back the token
 *
 * All communication between MacVim and the server goes via Apple Events.
 */

    static OSErr
odb_event(buf_T *buf, const AEEventID action)
{
    if (!(buf->b_odb_server_id && buf->b_ffname))
        return noErr;

    NSAppleEventDescriptor *targetDesc = [NSAppleEventDescriptor
            descriptorWithDescriptorType:typeApplSignature
                                   bytes:&buf->b_odb_server_id
                                  length:sizeof(OSType)];

    // TODO: Convert b_ffname to UTF-8?
    NSString *path = [NSString stringWithUTF8String:(char*)buf->b_ffname];
    NSData *pathData = [[[NSURL fileURLWithPath:path] absoluteString]
            dataUsingEncoding:NSUTF8StringEncoding];
    NSAppleEventDescriptor *pathDesc = [NSAppleEventDescriptor
            descriptorWithDescriptorType:typeFileURL data:pathData];

    NSAppleEventDescriptor *event = [NSAppleEventDescriptor
            appleEventWithEventClass:kODBEditorSuite
                             eventID:action
                    targetDescriptor:targetDesc
                            returnID:kAutoGenerateReturnID
                       transactionID:kAnyTransactionID];

    [event setParamDescriptor:pathDesc forKeyword:keyDirectObject];

    if (buf->b_odb_token)
        [event setParamDescriptor:buf->b_odb_token forKeyword:keySenderToken];

    return AESendMessage([event aeDesc], NULL, kAENoReply | kAENeverInteract,
            kAEDefaultTimeout);
}

    OSErr
odb_buffer_close(buf_T *buf)
{
    OSErr err = noErr;
    if (buf) {
        err = odb_event(buf, kAEClosedFile);

        buf->b_odb_server_id = 0;

        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;
        }
    }

    return err;
}

    OSErr
odb_post_buffer_write(buf_T *buf)
{
    return buf ? odb_event(buf, kAEModifiedFile) : noErr;
}

    void
odb_end(void)
{
    buf_T *buf;
    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
        odb_buffer_close(buf);
}

#endif // FEAT_ODB_EDITOR


    char_u *
get_macaction_name(expand_T *xp, int idx)
{
    static char_u *str = NULL;
    NSDictionary *actionDict = [[MMBackend sharedInstance] actionDict];

    if (nil == actionDict || idx < 0 || idx >= [actionDict count])
        return NULL;

    NSString *string = [[actionDict allKeys] objectAtIndex:idx];
    if (!string)
        return NULL;

    char_u *plainStr = (char_u*)[string UTF8String];

#ifdef FEAT_MBYTE
    if (str) {
        vim_free(str);
        str = NULL;
    }
    if (input_conv.vc_type != CONV_NONE) {
        int len = [string lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
        str = string_convert(&input_conv, plainStr, &len);
        plainStr = str;
    }
#endif

    return plainStr;
}


    int
is_valid_macaction(char_u *action)
{
    int isValid = NO;
    NSDictionary *actionDict = [[MMBackend sharedInstance] actionDict];
    if (actionDict) {
#ifdef FEAT_MBYTE
        action = CONVERT_TO_UTF8(action);
#endif
        NSString *string = [NSString stringWithUTF8String:(char*)action];
        isValid = (nil != [actionDict objectForKey:string]);
#ifdef FEAT_MBYTE
        CONVERT_TO_UTF8_FREE(action);
#endif
    }

    return isValid;
}

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;
}

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;
}