open_and_collect_tabs.py

from mojo.subscriber import Subscriber, registerRoboFontSubscriber
import AppKit

class MargielaTabs(Subscriber):

    def fontDocumentWantsToolbarItems(self, info):
        image = AppKit.NSImage.imageWithSystemSymbolName_accessibilityDescription_("arrow.trianglehead.merge", "")
        
        newItem = {'itemIdentifier': 'MargielaTabsButton',
                   'label':          'Margiela',
                   'toolTip':        'Merge Tabs',
                   'imageObject':     image,
                   'callback':        self.compile}
        info['itemDescriptions'].insert(5, newItem)


    def run(self, loaded_font=None):
        merge_all = False
        if not loaded_font:
            loaded_font = CurrentFont()
        if AppKit.NSEvent.modifierFlags() & AppKit.NSShiftKeyMask:
            # if shift down, merge all windows regardless of familyName
            merge_all = True
            windows = [w for w in AppKit.NSApp().orderedWindows() if hasattr(w, "windowName") and "FontWindow" in w.windowName()]
        else:
            # merge windows by familyName
            windowsMap = {}
            allFonts = {f.info.familyName:AllFonts().getFontsByFamilyName(f.info.familyName) for f in AllFonts()}
            for familyName,fonts in allFonts.items():
                windowsMap[familyName] = [w for w in AppKit.NSApp().orderedWindows() if hasattr(w, "windowName") and "FontWindow" in w.windowName() and w.document().font.info.familyName == familyName]
            windows = windowsMap.get(loaded_font.info.familyName)

        wind_len = len(windows)
        if wind_len == 1:
            windows[0].setToolbarStyle_(0)
        elif wind_len > 1:
            '''
            we cant select the first one because that is the 
            newest font and it would move the other font windows.
            '''
            for __ in windows:
                __.setToolbarStyle_(0) # set toolbar style upon opening

            run = True
            if run:
                main = next((window for window in windows if window.document().font.path != loaded_font.path), -1)
                if main in windows: windows.remove(main)
                for window in windows:
                    if window.document().font.path == loaded_font.path:
                        main.addTabbedWindow_ordered_(window, AppKit.NSWindowAbove)
        else:
            pass

    def compile(self, sender):
        self.run()

    def fontDocumentDidOpen(self,info):
        newFont = info["lowLevelEvents"][0]["font"]
        self.run(newFont)
		
registerRoboFontSubscriber(MargielaTabs)

This cool. Any idea how to change the focus of the tabs? I tried to make it sync to edit next master but couldn't quite get there.