#File: TabReplacer.py
#Replaces each tab character with 4 ' ' characers in each file
#in the current working directory and all subdirectories
#that ends with either ".h", ".cpp", or ".py".

import os
from os import listdir
from os.path import isfile

file_extensions = ['.h', '.cpp', '.py']

def is_code(filename):
    for ext in file_extensions:
        if filename.endswith(ext):
            return True
    return False

def handle_file_dir(dir_name, file_names_raw):
    for file_name in file_names_raw:
        full_name = dir_name + "/" + file_name
        if not isfile(full_name):
            continue
        if not is_code(full_name):
            continue
        file = open(full_name, 'r')
        lines = file.readlines()
        newlines = []
        for line in lines:
            newline = line.replace('\t', '    ')
            newlines.append(newline)

        file.close()
        
        file = open(full_name, 'w')
        file.writelines(newlines)
        file.close()

root_dir = '.'
for dir_name, subdirs, files in os.walk(root_dir):
    handle_file_dir(dir_name, files)