quick replace leading spaces with tabs

replace-leading-spaces-with-tabs.py

import os
import time

dirnames = ['classes', 'triggers']
timestamp = '%s' % time.time()

for dirname in dirnames:
    for fname in os.listdir(dirname):

        fpath = os.path.join(dirname, fname)

        # skip dirs
        if os.path.isdir(fpath):
            continue

        # skip wrong files
        is_filename_valid = fname.lower().endswith('.cls') or fname.lower().endswith('.trigger')
        is_filename_valid = is_filename_valid and not fname.lower().endswith('test.cls')
        if not is_filename_valid:
            continue

        # valid paths are printed
        print fpath

        f = open(fpath)
        new_lines = []
        for line in f.readlines():

            # count leading whitespace
            whitespace_count = 0
            for i, char in enumerate(line):
                if char == ' ':
                    whitespace_count = whitespace_count + 1
                elif char == '\t':
                    whitespace_count = whitespace_count + 4
                else:
                    break

            rest_of_line = line[i:]
            tab_count, space_count = divmod(whitespace_count, 4)
            new_line = '\t' * tab_count + ' ' * space_count + rest_of_line

            #print repr(new_line)
            new_lines.append(new_line)


        out_dirname = os.path.join(dirname, 'with-tabs.' + timestamp)
        if not os.path.exists(out_dirname):
            os.mkdir(out_dirname)
        out_fpath = os.path.join(out_dirname, fname)
        out_file = open(out_fpath, 'wb') # i hate text mode in python 2 iirc

        out_file.writelines(new_lines)
        out_file.close()