Allow custom handling of <script> and <style>

[oprypin]

It would be very useful to allow some kind of callbacks that let the user handle CSS and JS in whatever way they want, instead of just leaving them unminified.

[oprypin]

Use case:

import subprocess
import htmlmin

def handle_pre(tag, data):
    if tag == 'script':
        process = subprocess.Popen('uglifyjs --compress --mangle --comments'.split(),
                                   stdin=subprocess.PIPE, stdout=subprocess.PIPE)
        data = process.communicate(input=data.encode('utf-8'))[0].decode('utf-8')
    return data

print(htmlmin.minify('''...''', handle_pre=handle_pre))

[mankyd]

This seems like a reasonable proposal and, hopefully, straightforward to implement. I might refer to the attribute as "pre_content_processor". We'll need to decide whether the callback gets called multiple times for nested pre-content. I lean towards only calling it once for the top-most pre-tag.

If you'd like to submit a pull-request, I'd be happy to review it. Be sure to include tests. I can't promise an estimate for delivering this myself.

[oprypin]

I have implemented one that just calls the function for every handle_data (which is good enough for style/script). Making it into one call for top-most tag seems very difficult to me, but it sure would be better.

[oprypin]

I realize that the changes I made are very minor. This will not be useful for anything outside script and style tags. But it's all I need.

I am not planning to keep working on this.

Thanks for considering this issue.

[JeromeJ]

This.

It would be nice if htmlmin could allow to minify CSS or JS as well, natively or by letting us plug in a callback.

(Minifying CSS would probably be easy to implement if I were to guess)

[girst]

This would be very good to have. There are already javascript and css minifiers for python available -- maybe those could be hooked in automatically?