tabs_to_spaces.py

import os, re

dir = 'path-to-your-directory'

i=0
results = [] #Store changed files so you can look into it later
for dirname, dirnames, filenames in os.walk(dir):
    for filename in filenames:
        ext = filename.split('.')[-1] #Get Extension
        if ext in ('cfc','cfm'): #Limit search to specific file types
            i += 1
            path = dirname + '/' + filename
            with open(path) as f:
                content = f.read()
            
            #Get the line count before changes (for debugging)
            l1 = len(content.splitlines()) 
            
            if not re.search(r'(?<=\n)( *)\t', content):
                print(i, 'NOT MODIFYING:', path)
                continue
            
            #Keep replacing leading tabs with two spaces until there are none
            while re.search(r'(?<=\n)( *)\t', content):
                content = re.sub(r'(?<=\n)( *)\t','\g<1>  ', content)
            
            #Get the line count before changes
            l2 = len(content.splitlines()) 
            
            #Write the changes back to the file
            with open(path,'w') as f:
                f.write(content)
            results.append((i,path,l1,l2))
            print(i, path)