Use anyio (#107)

* feat: use anyio (implements the comments from #100)

Co-authored-by: David Brochart <david.brochart@gmail.com>

* docs: mention trio support and anyio use

* chore: bump minor version, prepare for new release

---------

Co-authored-by: David Brochart <david.brochart@gmail.com>

Author: volfpeter

README.md

@@ -29,6 +29,7 @@ Unleash your creativity with the full power and Python, without the hassle of le
 - Automatic and customizable **property-name conversion** from snake case to kebab case.
 - **Compatible** with any other templating library through wrappers.
 - **Fully-typed**.
+- **Trio**-compatible, through `AnyIO`.
 
 ## Testimonials
 
@@ -358,7 +359,7 @@ The primary aim of `htmy` is to be a `Jinja` alternative that is similarly power
 
 The library aims to minimze its dependencies. Currently the following dependencies are required:
 
-- `anyio`: for async file operations and networking.
+- `anyio`: for everything async.
 - `markdown`: for markdown parsing.
 
 ## Development

docs/index.md

@@ -29,6 +29,7 @@ Unleash your creativity with the full power and Python, without the hassle of le
 - Automatic and customizable **property-name conversion** from snake case to kebab case.
 - **Compatible** with any other templating library through wrappers.
 - **Fully-typed**.
+- **Trio**-compatible, through `AnyIO`.
 
 ## Testimonials
 
@@ -354,7 +355,7 @@ The primary aim of `htmy` is to be a `Jinja` alternative that is similarly power
 
 The library aims to minimze its dependencies. Currently the following dependencies are required:
 
-- `anyio`: for async file operations and networking.
+- `anyio`: for everything async.
 - `markdown`: for markdown parsing.
 
 ## Development

htmy/__init__.py

@@ -1,4 +1,4 @@
-__version__ = "0.10.3"
+__version__ = "0.11.0"
 
 from .core import ContextAware as ContextAware
 from .core import Formatter as Formatter

htmy/error_boundary.py

@@ -63,7 +63,8 @@ def _fallback_component(self, error: Exception) -> ComponentType:
         Raises:
             Exception: The received error if it's not accepted.
         """
-        if not (self._errors is None or any(e in self._errors for e in type(error).mro())):
+        errors = error.exceptions if isinstance(error, ExceptionGroup) else (error,)
+        if not (self._errors is None or any(e in self._errors for err in errors for e in type(err).mro())):
             raise error
 
         return as_component_type(self._fallback)

htmy/renderer/default.py

@@ -1,10 +1,11 @@
 from __future__ import annotations
 
-from asyncio import gather as asyncio_gather
 from collections import ChainMap, deque
 from inspect import isawaitable, iscoroutinefunction
 from typing import TYPE_CHECKING, TypeAlias
 
+from anyio import create_task_group
+
 from htmy.core import xml_format_string
 from htmy.typing import Context
 from htmy.utils import is_component_sequence
@@ -197,7 +198,9 @@ async def run(self) -> str:
             if async_todos:
                 current_async_todos = async_todos
                 self._async_todos = async_todos = deque()
-                await asyncio_gather(*(process_async_node(n, ctx) for n, ctx in current_async_todos))
+                async with create_task_group() as tg:
+                    for n, ctx in current_async_todos:
+                        tg.start_soon(process_async_node, n, ctx)
 
         return "".join(node.component for node in self._root.iter_nodes() if node.component is not None)  # type: ignore[misc]
 
@@ -217,8 +220,10 @@ async def _render_component(
         if len(component) == 0:
             return ""
 
-        renderers = (_ComponentRenderer(c, context, string_formatter=string_formatter) for c in component)
-        return "".join(await asyncio_gather(*(r.run() for r in renderers)))
+        result = ""
+        for c in component:
+            result += await _ComponentRenderer(c, context, string_formatter=string_formatter).run()
+        return result
     elif component is None:
         return ""
     else:

pyproject.toml

@@ -5,7 +5,7 @@ description = "Async, pure-Python server-side rendering engine."
 authors = [{ name = "Peter Volf", email = "do.volfp@gmail.com" }]
 license = "MIT"
 readme = "README.md"
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 dependencies = [
     "anyio>=4.7.0,<5",
     "markdown>=3.8,<4",
@@ -22,11 +22,11 @@ dev = [
     "mypy>=1.20.1,<2",
     "poethepoet>=0.44.0",
     "pytest>=9.0.3",
-    "pytest-asyncio>=1.3.0",
     "pytest-random-order>=1.2.0",
     "ruff>=0.15.11,<0.16",
     "types-markdown>=3.10.2.20260408,<4",
     "typing-extensions>=4.12.2,<5",
+    "trio>=0.33.0",
     "types-lxml>=2026.2.16",
     "zensical>=0.0.33",
 ]

tests/renderer/test_default_renderer.py

@@ -6,7 +6,7 @@
 from htmy.renderer.typing import RendererType
 
 
-@pytest.mark.asyncio
+@pytest.mark.anyio
 async def test_async_children_of_async_node(
     baseline_renderer: RendererType,
     default_renderer: RendererType,

tests/renderer/test_renderer_comparison.py

@@ -102,7 +102,7 @@ async def htmy(self, context: Context) -> Component:
 # -- Tests
 
 
-@pytest.mark.asyncio
+@pytest.mark.anyio
 @pytest.mark.parametrize(
     ("component",),
     (

tests/renderer/test_renderer_in_context.py

@@ -6,7 +6,7 @@
 from htmy.renderer.typing import RendererType
 
 
-@pytest.mark.asyncio
+@pytest.mark.anyio
 @pytest.mark.parametrize(
     "renderer",
     [

tests/test_function_component.py

@@ -1,8 +1,8 @@
-import asyncio
 from dataclasses import dataclass
 from datetime import date
 from time import perf_counter
 
+import anyio
 import pytest
 
 from htmy import Component, ComponentType, Context, Renderer, component, html
@@ -25,7 +25,7 @@ def sync_function_component(msg: str, ctx: Context) -> ComponentType:
 
 @component
 async def async_function_component(msg: str, ctx: Context) -> ComponentType:
-    await asyncio.sleep(async_delay)
+    await anyio.sleep(async_delay)
     dt: date = ctx["date"]
     return html.p(dt.isoformat(), ": ", msg)
 
@@ -41,7 +41,7 @@ def sync_function_component_with_function_alias(msg: str, ctx: Context) -> Compo
 
 @component.function
 async def async_function_component_with_function_alias(msg: str, ctx: Context) -> ComponentType:
-    await asyncio.sleep(async_delay)
+    await anyio.sleep(async_delay)
     dt: date = ctx["date"]
     return html.p(dt.isoformat(), ": ", msg)
 
@@ -57,7 +57,7 @@ def sync_context_only_function_component(ctx: Context) -> ComponentType:
 
 @component.context_only
 async def async_context_only_function_component(ctx: Context) -> ComponentType:
-    await asyncio.sleep(async_delay)
+    await anyio.sleep(async_delay)
     dt: date = ctx["date"]
     return html.p(dt.isoformat(), ": ", message)
 
@@ -76,7 +76,7 @@ def sync_method_component(self, msg: str, ctx: Context) -> ComponentType:
 
     @component.method
     async def async_method_component(self, msg: str, ctx: Context) -> ComponentType:
-        await asyncio.sleep(async_delay)
+        await anyio.sleep(async_delay)
         dt: date = ctx["date"]
         return html.p(dt.isoformat(), ": ", msg, " ", self.goodbye)
 
@@ -87,7 +87,7 @@ def sync_context_only_method_component(self, ctx: Context) -> ComponentType:
 
     @component.context_only_method
     async def async_context_only_method_component(self, ctx: Context) -> ComponentType:
-        await asyncio.sleep(async_delay)
+        await anyio.sleep(async_delay)
         dt: date = ctx["date"]
         return html.p(dt.isoformat(), ": ", self.goodbye)
 
@@ -110,7 +110,7 @@ def baseline_renderer() -> BaselineRenderer:
 # -- Tests
 
 
-@pytest.mark.asyncio
+@pytest.mark.anyio
 @pytest.mark.parametrize(
     ("comp", "expected", "min_duration"),
     (