Sublime Text 3 Plugin - Closes the focused view and focuses the next most recent view

FocusMostRecentTabCloser.py

#
# MIT License
#
# To use, assign keys to the "focus_most_recent_tab_closer" command, e.g.
# {"keys": ["ctrl+k", "ctrl+w"], "command": "focus_most_recent_tab_closer"},
#

import sublime
import sublime_plugin
import time

LAST_FOCUS_TIME_KEY = "focus_most_recent_tab_closer_last_focused_time"

class FocusMostRecentTabCloserCommand(sublime_plugin.TextCommand):
    """ Closes the focused view and focuses the next most recent. """

    def run(self, edit):

        most_recent = []
        target_view = None
        window = self.view.window()

        if not window.views():
            return

        for view in window.views():
            if view.settings().get(LAST_FOCUS_TIME_KEY):
                most_recent.append(view)

        most_recent.sort(key=lambda x: x.settings().get(LAST_FOCUS_TIME_KEY))
        most_recent.reverse()

        # Target the most recent but one view - the most recent view
        # is the one that is currently focused and about to be closed.

        if len(most_recent) > 1:
            target_view = most_recent[1]

        # Switch focus to the target view, this must be done before
        # close() is called or close() will shift focus to the left
        # automatically and that buffer will be activated and muck
        # up the most recently focused times.

        if target_view:
            window.focus_view(target_view)

        self.view.close()

        # If closing a view which requires a save prompt, the close()
        # call above will automatically focus the view which requires
        # the save prompt. The code below makes sure that the correct
        # view gets focused after the save prompt closes.

        if target_view and window.active_view().id() != target_view.id():
            window.focus_view(target_view)


class FocusMostRecentTabCloserListener(sublime_plugin.EventListener):
    def on_activated(self, view):
        """ Stores the time the view is focused in the view's settings. """
        view.settings().set(LAST_FOCUS_TIME_KEY, time.time())