Pass a GM Studio project / project directory / object / script as argument 1, and get it beautified for you ;)

GMBeautifier.py

from bs4 import BeautifulSoup
import jsbeautifier
import os
import sys
import re

def beautifyObject(filePath):
    f = open(filePath, 'r+')
    obj = BeautifulSoup(f, 'xml')
    f.close()
    for event in obj.find_all('event'):
        for action in event.find_all('action'):
            try:
                if not action.arguments.argument.find('string') is None:
                    s = action.arguments.argument.find('string')
                    s.string = jsbeautifier.beautify(s.string)
            except:
                pass


    bsString = obj.prettify()

    text_re = re.compile('>\n\s+([^<>\s].*?)\n\s+</', re.DOTALL)
    prettyXml = text_re.sub('>\g<1></', bsString)

    f = open(filePath, 'w+')
    f.write(prettyXml)
    f.close()

if __name__ == '__main__':
    path = sys.argv[1]

    if path.endswith('.gmx'):
        print('Working Path: ' + path)
        if os.path.isfile(path):
            if path.endswith('.project.gmx'):
                path, filename = os.path.split(path)
            elif path.endswith('.object.gmx'):
                print('GameMaker:Studio Object found, beautifying XML and GML...', end='')
                beautifyObject(path)
                print('prettified & beautified!')
            elif path.endswith('.gml'):
                print('GameMaker Script found, beautifying GML...', end='')
                gml = jsbeautifier.beautify_file(path)
                f = open(path, 'w+')
                f.write(gml)
                f.close()
                print('beautified!')



        if os.path.isdir(path) and path.endswith('.gmx') and os.path.exists(path + '\\objects\\') and os.path.exists(path + '\\scripts\\'):
            print('GameMaker:Studio Project found, beautifying all objects and scripts')
            objectsDir = path + '\\objects\\'
            scriptsDir = path + '\\scripts\\'
            for subdir, dirs, files in os.walk(objectsDir):
                for file in files:
                    print('Found object: ' + file + '...', end='')
                    beautifyObject(os.path.join(objectsDir, file))
                    print('prettified & beautified!')

            for subdir, dirs, files in os.walk(scriptsDir):
                for file in files:
                    print('Found script:' + file + '...', end='')
                    gml = jsbeautifier.beautify_file(os.path.join(scriptsDir, file))
                    f = open(os.path.join(scriptsDir, file), 'w+')
                    f.write(gml)
                    f.close()
                    print('beautified!')

    else:
        print('Woah! That\'s not a GameMaker:Studio File/Project!')