reordertmux.py

#!/usr/bin/env python2
import subprocess

def move_window(oldpos, newpos):
  return subprocess.check_output(['tmux', 'move-window', '-s', str(oldpos), '-t', str(newpos)])

def main():
  output = subprocess.check_output(['tmux', 'list-windows'])
  lines = [l.strip() for l in output.split('\n') if l.strip() != '']
  frags = [line.strip().split(': ', 1) for line in output.split('\n') if line.strip() != '']

  shell_command = 'bash'
  frags.sort(key = lambda (idx, rest): rest if '* ' not in rest else shell_command)

  free_pos = max([int(f[0]) for f in frags]) + 1

  for newpos, (oldpos, _) in enumerate(frags):
    move_window(oldpos, int(newpos) + free_pos)

  active_idx = None
  for newpos, (_, rest) in enumerate(frags):
    actual_pos = newpos + free_pos
    move_window(actual_pos, newpos)
    if '* ' in rest:
      active_idx = newpos

  subprocess.check_output(['tmux', 'select-window', '-t', str(active_idx)])

main()