Convert Wikipedia Chess Diagram to FEN

wikipedia_to_fen.py

#!/usr/bin/python

# Copyright 2017 Google LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

import sys

if len(sys.argv) < 2:
  print 'usage: wikipedia_to_fen.py diagram.txt'
  exit

with open(sys.argv[1]) as input:
  content = input.readlines()

rows = []

for line in content:
  entry = line.strip().split('|')
  if len(entry) == 9:
    rows.append(entry)

fen = []

for row in rows:
  spaces = 0
  for square in row[1:]:
    if square.strip() == '':
      spaces += 1
    else:
      if spaces > 0:
        fen.append(str(spaces))
        spaces = 0
      piece = square[0]
      if square[1] == 'l':
        piece = piece.upper()
      fen.append(piece)
  if spaces > 0:
    fen.append(str(spaces))
  fen.append('/')

result = ''.join(fen[:-1]) + ' w - -'
print result