wcycle_sinks.py

#!/usr/bin/env python3

from subprocess import check_output
from json import loads
from re import findall, DOTALL, MULTILINE

def find_focused(tree):
    if tree["focused"] == True:
        return tree["pid"]
    elif 'nodes' in tree:
            for n in tree['nodes']:
                pid = find_focused(n)
                if pid: return pid

inputs = findall(r'.*?index: (\d+).*?sink: (\d+).*?application\.process\.id = "(\d+)"',
                 check_output(['pacmd', 'list-sink-inputs']).decode("utf-8"), DOTALL|MULTILINE)
sinks = findall(r'index: (\d+)', check_output(['pacmd', 'list-sinks']).decode("utf-8"))
tree = loads(check_output(['swaymsg', '-t', 'get_tree']))

focused_pid = find_focused(tree)

for app in inputs:
    if app[2] == str(focused_pid):
        # find new sink index
        index = 0
        for i in range(len(sinks)):
            if sinks[i] == app[1]:
                index = (i + 1) % len(sinks) # rotation
                break
        check_output(['pacmd', 'move-sink-input', app[0], sinks[index] ])
        break