rankchange

#!/usr/bin/python3

import re
import sys

color_esc_re = re.compile(r'\x1b[\[0-9;]*[mK]')

def get_rank(path):
  ret = {}
  with open(path) as f:
    for i, l in enumerate(f):
      l = color_esc_re.sub('', l)
      lang = l.split(None, 1)[0].strip()
      ret[lang] = i
  return ret

def show_changes(a, b):
  for lang, cur_rank in b.items():
    old_rank = a.get(lang)
    if not old_rank:
      change = '*'
    elif cur_rank < old_rank:
      change = f'↑ {old_rank - cur_rank}'
    elif cur_rank > old_rank:
      change = f'↓ {cur_rank - old_rank}'
    else:
      change = '='
    print('%30s  %-4s' % (lang, change))

def main(filea, fileb):
  a = get_rank(filea)
  b = get_rank(fileb)
  show_changes(a, b)

if __name__ == '__main__':
  main(sys.argv[1], sys.argv[2])