assets_replace.py

import os
import os.path as path

htmlroot = '/home/martins/Desktop/htmltest'
asset_replacements = {
    'http://symfony.com/js/v5/all.js': '{}_static/all.js',
    'http://symfony.com/css/compiled/v5/all.css': '{}_static/all.css'
}

def calculate_relative_path_to_root(path, start='html'):
    levels = [level for level in path.split(start)[-1].split('/') if level]   
    level = '' 
    for l in levels[1:]:  # levels[1:] skip one level
        level += '../'
    return level


def search_and_replace(filename):
    calculated_relative_path = calculate_relative_path_to_root(filename, 
        path.basename(htmlroot))   
    with open(filename, 'r+') as f:
        content = f.read() # Yeah! Whole file in the memory
        for search, replacement in asset_replacements.iteritems():
            if search in content:                
                replacewith = replacement.format(calculated_relative_path)
                content = content.replace(search, replacewith)                
        f.seek(0)
        f.truncate()
        f.write(content)
                
os.chdir(htmlroot)

for parentpath, dirs, filenames in os.walk(htmlroot):
    print "\n>>> {}".format(parentpath)
    for filename in filenames:
        if path.splitext(filename)[1] == '.html':
            search_and_replace(path.join(parentpath, filename))