Sublime Text 3 API, check if view scroll position is at bottom

plugin.py

# useful for implementing output view auto scrolling, only when at the bottom

def view_is_at_bottom(view):
    layout_h = view.layout_extent()[1]
    view_h = view.viewport_extent()[1]
    view_y = view.viewport_position()[1]
    line_h = view.line_height()

    view_taller_than_content = layout_h <= view_h
    at_bottom_of_content = view_y + view_h >= layout_h - line_h

    return view_taller_than_content or at_bottom_of_content

This is actually quite slow, a less accurate but more efficient way is

def view_is_at_bottom(self):
    return self.view.visible_region().b + 100 > self.view.size()