htm.py ❤️ hyperpython

example.py

from htm import htm
from hyperpython import h
from inspect import signature, Parameter


@htm
def html(tag, props, children):
  if callable(tag):
    return relaxed_call(tag, children=children, **props)
  return h(tag, props, children)


def relaxed_call(callable_, **kwargs):
  # Hackety-hack-hack warning!
  # Call callable_ with the given keyword arguments, but
  # only those that callable_ expects - ignore others.

  sig = signature(callable_)
  parameters = sig.parameters

  if not any(p.kind == p.VAR_KEYWORD for p in parameters.values()):
    extra_key = "_"
    while extra_key in parameters:
      extra_key += "_"

    sig = sig.replace(parameters=[*parameters.values(), Parameter(extra_key, Parameter.VAR_KEYWORD)])
    kwargs = dict(sig.bind(**kwargs).arguments)
    kwargs.pop(extra_key, None)

  return callable_(**kwargs)


class HyperpythonComponent:
  def __hyperpython__(self):
    return html("""<h2>Hyperpython components!</h2>""")


def functional_component(children, header="Functional components!"):
  return html("""
    <h2>{header}</h2>
    {children}
  """)


print(
  html("""
    <div>
      <h1>Hello Python</h1>
      <p>Now you can write HTML in Python!</p>

      <!-- also with components -->
      <{HyperpythonComponent} />

      <!-- and functional components -->
      <{functional_component}>
        <li>foo</li>
        <li>bar</li>
      <//>
    </div>
  """)
)