#!/usr/bin/env python
#
#===- rename_check.py - clang-tidy check renamer -------------*- python -*--===#
#
#                     The LLVM Compiler Infrastructure
#
# This file is distributed under the University of Illinois Open Source
# License. See LICENSE.TXT for details.
#
#===------------------------------------------------------------------------===#

import os
import glob
import argparse


def replaceInFile(fileName, sFrom, sTo):
  if sFrom == sTo:
    return
  txt = None
  with open(fileName, "r") as f:
    txt = f.read()

  if sFrom not in txt:
    return

  txt = txt.replace(sFrom, sTo)
  print("Replace '%s' -> '%s' in '%s'" % (sFrom, sTo, fileName))
  with open(fileName, "w") as f:
    f.write(txt)


def generateCommentLineHeader(filename):
  return ''.join(['//===--- ',
                  os.path.basename(filename),
                  ' - clang-tidy ',
                  '-' * max(0, 42 - len(os.path.basename(filename))),
                  '*- C++ -*-===//'])


def generateCommentLineSource(filename):
  return ''.join(['//===--- ',
                  os.path.basename(filename),
                  ' - clang-tidy',
                  '-' * max(0, 52 - len(os.path.basename(filename))),
                  '-===//'])


def fileRename(fileName, sFrom, sTo):
  if sFrom not in fileName:
    return fileName
  newFileName = fileName.replace(sFrom, sTo)
  print("Rename '%s' -> '%s'" % (fileName, newFileName))
  os.rename(fileName, newFileName)
  return newFileName


def getListOfFiles(clang_tidy_path):
  files = glob.glob(os.path.join(clang_tidy_path, '*'))
  for dirname in files:
    if os.path.isdir(dirname):
      files += glob.glob(os.path.join(dirname, '*'))
  files += glob.glob(os.path.join(clang_tidy_path, '..', 'test',
                                  'clang-tidy', '*'))
  files += glob.glob(os.path.join(clang_tidy_path, '..', 'docs',
                                  'clang-tidy', 'checks', '*'))
  return [filename for filename in files if os.path.isfile(filename)]


def main():
  parser = argparse.ArgumentParser(description='Rename clang-tidy check.')
  parser.add_argument('module', type=str,
                      help='Module where the renamed check is defined')
  parser.add_argument('old_check_name', type=str,
                      help='Old check name.')
  parser.add_argument('new_check_name', type=str,
                      help='New check name.')
  args = parser.parse_args()

  args.module = args.module.lower()
  check_name_camel = ''.join(map(lambda elem: elem.capitalize(),
                                 args.old_check_name.split('-'))) + 'Check'
  check_name_new_camel = (''.join(map(lambda elem: elem.capitalize(),
                                      args.new_check_name.split('-'))) +
                          'Check')

  clang_tidy_path = os.path.dirname(__file__)

  header_guard_old = (args.module.upper() + '_' +
                      args.old_check_name.upper().replace('-', '_'))
  header_guard_new = (args.module.upper() + '_' +
                      args.new_check_name.upper().replace('-', '_'))

  for filename in getListOfFiles(clang_tidy_path):
    originalName = filename
    filename = fileRename(filename, args.old_check_name,
                          args.new_check_name)
    filename = fileRename(filename, check_name_camel, check_name_new_camel)
    replaceInFile(filename, generateCommentLineHeader(originalName),
                  generateCommentLineHeader(filename))
    replaceInFile(filename, generateCommentLineSource(originalName),
                  generateCommentLineSource(filename))
    replaceInFile(filename, header_guard_old, header_guard_new)
    replaceInFile(filename, args.old_check_name, args.new_check_name)
    replaceInFile(filename, check_name_camel, check_name_new_camel)

if __name__ == '__main__':
  main()