Making images preview work in ranger

I cannot find how to make it work, simply have no idea.

There is a script on GitHub, but it doesn’t work for me:

Add the following to your ~/.config/ranger/commands.py:

from subprocess import Popen, PIPE, run
import time

@register_image_displayer("imv")
class IMVImageDisplayer(ImageDisplayer):
    """
    Implementation of ImageDisplayer using imv
    """
    is_initialized = False

    def __init__(self):
        self.process = None

    def initialize(self):
        """ start imv """
        if (self.is_initialized and self.process.poll() is None and
                not self.process.stdin.closed):
            return

        self.process = Popen(['imv'], cwd=self.working_dir,
                             stdin=PIPE, universal_newlines=True)
        self.is_initialized = True
        time.sleep(1)

    def draw(self, path, start_x, start_y, width, height):
        self.initialize()
        run(['imv-msg', str(self.process.pid), 'close'])
        run(['imv-msg', str(self.process.pid), 'open', path])

    def clear(self, start_x, start_y, width, height):
        self.initialize()
        run(['imv-msg', str(self.process.pid), 'close'])

    def quit(self):
        if self.is_initialized and self.process.poll() is None:
            self.process.terminate()

Ensure the following lines appear in your ~/.config/ranger/rc.conf:

set preview_images true
set preview_images_method imv
set use_preview_script true
set preview_script ~/path/to/your/scope.sh     # or whatever your preview script is