Automatic indentation detection for Notepad++ (requires Python Script extension)

startup.py

# -*- coding: utf-8 -*-
# Automatic indentation detection for Notepad++
# Version 1.0.1
# Copyright (c) 2015 Vincent Paré
# Licensed under the Apache 2.0 license : http://opensource.org/licenses/Apache-2.0
# Tested on Python Script 1.0.8.0 (Python 2.7.6) @ Notepad++ 6.7.8.2

import sys
from Npp import *
sys.stderr = console

import re
import time

def indent_guess_tab(text):
    for line in text.split("\n"):
        pattern = re.compile("^( {4,}|\t)")
        match = pattern.match(line)
        if (match):
            return True if ("\t" in match.group(1)) else False

def indent_auto_detect(arg):
    start = time.clock()
    
    # Get text sample
    maxLen = 500000
    len = editor.getTextLength()
    len = len if len < maxLen else maxLen
    sample = editor.getTextRange(0, len)
    
    # Indent set
    current_use_tab = editor.getUseTabs()
    use_tab = indent_guess_tab(sample)
    
    if (use_tab != None and use_tab != current_use_tab):
        console.write("Indent use tab switch (%s => %s)\n" % (current_use_tab, use_tab))
        editor.setUseTabs(use_tab)
    
    end = time.clock()
    console.write("Indentation detection took %s ms\n" % (round((end-start)*1000, 3)))

notepad.clearCallbacks([NOTIFICATION.BUFFERACTIVATED, NOTIFICATION.READY])    
notepad.callback(indent_auto_detect, [NOTIFICATION.BUFFERACTIVATED])
notepad.callback(indent_auto_detect, [NOTIFICATION.READY])
console.write("Automatic indentation detection started\n")
indent_auto_detect(None)