First implementation of bindings

tests/core/test_commands.py

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+from dataclasses import dataclass
+from typing import Any
+
+import pytest
+from fasthtml.components import Button
+from myutils.observable import make_observable, bind
+
+from myfasthtml.core.commands import Command, CommandsManager
+from myfasthtml.core.constants import ROUTE_ROOT, Routes
+from myfasthtml.test.matcher import matches
+
+
+@dataclass
+class Data:
+  value: Any
+
+
+def callback():
+  return "Hello World"
+
+
+@pytest.fixture(autouse=True)
+def reset_command_manager():
+  CommandsManager.reset()
+
+
+def test_i_can_create_a_command_with_no_params():
+  command = Command('test', 'Command description', callback)
+  assert command.id is not None
+  assert command.name == 'test'
+  assert command.description == 'Command description'
+  assert command.execute() == "Hello World"
+
+
+def test_command_are_registered():
+  command = Command('test', 'Command description', callback)
+  assert CommandsManager.commands.get(str(command.id)) is command
+
+
+def test_i_can_bind_a_command_to_an_element():
+  command = Command('test', 'Command description', callback)
+  elt = Button()
+  updated = command.bind_ft(elt)
+  
+  expected = Button(hx_post=f"{ROUTE_ROOT}{Routes.Commands}")
+  
+  assert matches(updated, expected)
+
+
+def test_i_can_suppress_swapping_with_target_attr():
+  command = Command('test', 'Command description', callback).htmx(target=None)
+  elt = Button()
+  updated = command.bind_ft(elt)
+  
+  expected = Button(hx_post=f"{ROUTE_ROOT}{Routes.Commands}", hx_swap="none")
+  
+  assert matches(updated, expected)
+
+
+def test_i_can_bind_a_command_to_an_observable():
+  data = Data("hello")
+  
+  def on_data_change(old, new):
+    return old, new
+  
+  def another_callback():
+    data.value = "new value"
+    return "another callback result"
+  
+  make_observable(data)
+  bind(data, "value", on_data_change)
+  command = Command('test', 'Command description', another_callback).bind(data)
+  
+  res = command.execute()
+  
+  assert res == ["another callback result", ("hello", "new value")]
+
+
+def test_i_can_bind_a_command_to_an_observable_2():
+  data = Data("hello")
+  
+  def on_data_change(old, new):
+    return old, new
+  
+  def another_callback():
+    data.value = "new value"
+    return ["another 1", "another 2"]
+  
+  make_observable(data)
+  bind(data, "value", on_data_change)
+  command = Command('test', 'Command description', another_callback).bind(data)
+  
+  res = command.execute()
+  
+  assert res == ["another 1", "another 2", ("hello", "new value")]