mirror of
https://github.com/1j01/textual-paint.git
synced 2024-09-11 15:56:03 +03:00
320 lines
15 KiB
Python
320 lines
15 KiB
Python
"""Record interactions and save as an automated test.
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TODO:
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- Handle right clicks, middle clicks, and modifier keys.
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- Handle mouse wheel events.
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- Handle paste events.
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- Ignore clicks on the #pilot-recorder-steps widget.
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- Add a way to toggle the steps view.
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- Try adding a delay before reloading so you can undo multiple steps at once.
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- Auto-save to a WIP test file.
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- Ideally the supporting functions like drag() should be part of Pilot.
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- Ideally SnapCompareType should be part of pytest-textual-snapshot.
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FIXME:
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- Clicks on the wrong thing sometimes
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- Steps view doesn't update sometimes
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"""
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import os
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from typing import Any, Callable
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from rich.syntax import Syntax
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from rich.text import Text
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from textual.app import App
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from textual.css.query import NoMatches, TooManyMatches
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from textual.dom import DOMNode
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from textual.errors import NoWidget
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from textual.events import Event, Key, MouseDown, MouseMove, MouseUp
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from textual.geometry import Offset
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from textual.pilot import Pilot
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from textual.screen import Screen
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from textual.widgets import Static
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def unique_file(path: str) -> str:
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"""Return a path that doesn't exist yet, by appending a number to the filename."""
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filename, extension = os.path.splitext(path)
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counter = 1
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while os.path.exists(path):
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path = f"{filename}_{counter}{extension}"
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counter += 1
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return path
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def indent(text: str, spaces: int) -> str:
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"""Return the text indented by the given number of spaces (including the first line)."""
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return "\n".join(" " * spaces + line for line in text.splitlines())
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async def async_exec(code: str, **kwargs: object) -> object:
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"""Execute the given code in an async function and return the result. Keyword arguments are made available as variables."""
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# This dict will be used for passing variables to the `exec`ed code
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# as well as retrieving the function defined by the code.
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scope = kwargs
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# Make an async function with the code and `exec` it
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exec(f"async def async_exec_code():\n{indent(code, 4)}", scope)
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# Get `async_exec_code` from the scope, call it and return the result
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return await scope['async_exec_code']() # type: ignore
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def get_selector(target: DOMNode) -> tuple[str, int|None]:
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"""Return a selector that can be used to find the widget."""
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app = target.app
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widget = target
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if widget.id:
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return f"#{widget.id}", None
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selector = widget.css_identifier
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while widget.parent and not isinstance(widget.parent, Screen):
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widget = widget.parent
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if widget.id:
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selector = f"#{widget.id} {selector}"
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break
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else:
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selector = f"{widget.css_identifier} {selector}"
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try:
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query_result = app.query_one(selector)
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except TooManyMatches:
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return selector, app.query(selector).nodes.index(target) # type: ignore
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# smarter differentiators would be nice, like tooltip or text content,
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# but at least with indices, you'll know when you changed the tab order
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except NoMatches:
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raise Exception(f"Selector {selector!r} didn't match the target widget ({target!r})")
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if query_result is not target:
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raise Exception(f"Selector {selector!r} matched a different widget than the target ({query_result!r} rather than {target!r})")
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return selector, None
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original_on_event = App.on_event # type: ignore
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class PilotRecorder():
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"""Record (and undo and replay) interactions with an app, and save as a test."""
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def __init__(self, app_class: Callable[[], App[Any]], app_path: str, output_file: str | None = None) -> None:
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"""Initialize the test recorder.
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app_class: A function that returns an App instance.
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app_path: The path to the app's source code, relative to output_file.
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output_file: The path to save the test to.
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"""
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self.app_path = app_path
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self.app_class = app_class
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self.output_file = output_file or unique_file("tests/test_playback.py")
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self.app: App[Any] | None = None
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self.steps: list[tuple[Event, Offset, str, int|None]] = []
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self.replaying: bool = False
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self.next_after_exit: Callable[[], None] | None = None
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self.steps_view = Static(id="pilot-recorder-steps")
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self.steps_view.styles.dock = "right"
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self.steps_view.styles.width = 40
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self.steps_view.styles.height = "100%"
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recorder = self
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async def on_event(self: App[Any], event: Event) -> None:
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# - Record before the event is handled, so a clicked widget that removes itself,
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# such as an OK button in a dialog, will still be in the DOM when we record it.
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# - Every event seems to be received twice, once with _forwarded set and once without.
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# I don't claim to understand the forwarding scheme, but ignoring either
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# the forwarded or the un-forwarded events seems workable.
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if not event._forwarded:
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recorder.handle_event(event)
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await original_on_event(self, event)
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self.app_on_event = on_event
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def handle_event(self, event: Event) -> None:
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"""Record the event as a step, or handle certain key presses as commands."""
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assert self.app is not None, "app should be set if we're recording an event from it"
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if isinstance(event, (MouseDown, MouseMove, MouseUp)):
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if self.replaying:
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return
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try:
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widget, _ = self.app.get_widget_at(*event.screen_offset)
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except NoWidget:
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return
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offset = event.screen_offset - widget.region.offset
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try:
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selector, index = get_selector(widget)
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except Exception as e:
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# e.g. Scrollbar can't be queried for
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# Currently this means you can't drag a scrollbar
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# in a test recording, but if you're not trying to,
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# this shouldn't be fatal.
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print(e)
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return
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self.steps.append((event, offset, selector, index))
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self.steps_changed()
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elif isinstance(event, Key):
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if event.key == "ctrl+z" and self.steps:
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while self.steps and isinstance(self.steps[-1][0], (MouseMove, MouseUp)):
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self.steps.pop()
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self.steps.pop()
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while self.steps and isinstance(self.steps[-1][0], MouseMove):
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self.steps.pop()
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self.steps_changed()
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self.run() # restart the app to replay up to this point
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elif event.key == "ctrl+r":
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self.run() # restart and replay
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elif event.key == "ctrl+c":
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self.save_replay()
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self.app.exit(None, Text("Saved test recording to " + self.output_file))
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else:
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if self.replaying:
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return
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self.steps.append((event, Offset(), "", None))
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self.steps_changed()
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def steps_changed(self) -> None:
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"""Update the steps view any time the steps change."""
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self.update_steps_view()
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def update_steps_view(self, highlight_lines: set[int] | None = None) -> None:
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assert self.app is not None, "app should be set when updating the steps view"
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if self.steps_view.parent != self.app.screen:
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self.app.screen.mount(self.steps_view)
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# self.steps_view.update("\n".join(
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# (f"{step_index + 1}. {event!r}" + ("{offset!r}, {selector!r}, {index!r}" if isinstance(event, (MouseDown, MouseMove, MouseUp)) else ""))
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# for step_index, (event, offset, selector, index) in enumerate(self.steps)
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# ))
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self.steps_view.update(Syntax(self.get_replay_code(), "python", line_numbers=True, highlight_lines=highlight_lines))
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def highlight_line(self, line_index: int) -> None:
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"""Highlight the given line in the steps view."""
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self.update_steps_view({line_index + 1})
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async def replay_steps(self, pilot: Pilot[Any]) -> None:
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"""Replay the recorded steps, in the current app instance."""
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if not self.steps:
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return
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await pilot._wait_for_screen(timeout=5.0)
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self.replaying = True
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replay_code = self.get_replay_code()
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# Fix import
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replay_code = replay_code.replace("from tests.pilot_helpers import", "from pilot_helpers import")
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# Instrument with highlight_line calls
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replay_code = "\n".join(line if "def " in line or len(line) == 0 or line[0] == " " else f"highlight_line({line_index}); {line}" for line_index, line in enumerate(replay_code.splitlines()))
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await async_exec(replay_code, pilot=pilot, Offset=Offset, highlight_line=self.highlight_line)
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self.replaying = False
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def run(self) -> None:
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"""Start the app, or restart it to replay the recorded steps."""
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def startup_and_replay() -> None:
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"""Start the app, hook its events, and replay steps if there are any."""
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self.next_after_exit = None # important to allowing you to exit; don't keep launching the app
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self.app = self.app_class()
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self.app.on_event = self.app_on_event.__get__(self.app)
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self.app.run(auto_pilot=self.replay_steps)
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# run is blocking, so this will happen after the app exits
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if self.next_after_exit:
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self.next_after_exit()
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if self.app is not None:
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# exit can't be awaited, because it stops the whole event loop (eventually)
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# but we need to wait for the event loop to stop before we can start a new app
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self.next_after_exit = startup_and_replay
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self.app.exit()
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else:
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startup_and_replay()
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def get_replay_code(self) -> str:
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"""Return code to replay the recorded steps."""
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helpers: set[str] = set()
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steps_code = ""
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for step_index, (event, offset, selector, index) in enumerate(self.steps):
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# steps_code += f"# {event!r}, {offset!r}, {selector!r}, {index!r})\n"
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if isinstance(event, (MouseDown, MouseMove)):
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pass
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elif isinstance(event, MouseUp):
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# Detect drags
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# TODO: record Click events and don't trigger a drag if there's a Click after the MouseUp
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# or maybe just enable replaying a Click at the end of the drag sequence...
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# If you're drawing on a canvas, the Click doesn't matter,
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# but if you're clicking a button, the drag doesn't matter.
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# You probably never need both in the same test (maybe testing a text field's selection and focus?),
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# but it's impossible to know which is intended. (If it's a Button, 99%+ you want a Click, but there are many widgets.)
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# Maybe best is to include in a comment, "# Did you mean `await pilot.click(...)`?"
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# or more neutrally, "# Drag ended with Click event."
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# "# If you want just a click, use (...) and remove the drag helper if it's not needed."
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# "# If you want just a drag, remove click=True."
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if isinstance(self.steps[step_index - 1][0], MouseMove):
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helpers.add("drag")
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# find the last mouse down event
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# TODO: make sure the offsets are all relative to
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# the initial position of the widget that got MouseDown.
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for previous_step_index in range(step_index - 1, -1, -1):
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previous_event, _, _, _ = self.steps[previous_step_index]
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if isinstance(previous_event, MouseDown):
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break
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else:
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raise Exception(f"Mouse up event {step_index} has no matching mouse down event")
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offsets = [step[1] for step in self.steps[previous_step_index:step_index + 1]]
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steps_code += f"await drag(pilot, {selector!r}, [{', '.join(repr(offset) for offset in offsets)}])\n"
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continue
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# Handle clicks
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if index is None:
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steps_code += f"await pilot.click({selector!r}, offset=Offset({offset.x}, {offset.y}))\n"
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else:
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# Strategy: click on the screen, offset by the widget's position.
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# steps_code += f"widget = pilot.app.query({selector!r})[{index!r}]\n"
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# # can't pass a widget to pilot.click, only a selector, or None
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# steps_code += f"await pilot.click(offset=Offset({offset.x}, {offset.y}) + widget.region.offset)\n"
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# Strategy: add a class to the widget, and click on that.
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helpers.add("click_by_index")
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steps_code += f"await click_by_index(pilot, {selector!r}, {index!r})\n"
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elif isinstance(event, Key):
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steps_code += f"await pilot.press({event.key!r})\n"
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else:
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raise Exception(f"Unexpected event type {type(event)}")
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helper_code = f"from tests.pilot_helpers import {', '.join(helpers)}\n\n" if helpers else ""
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return (helper_code + steps_code) or "pass"
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def get_test_code(self) -> str:
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"""Return pytest code that uses the replay."""
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return f"""\
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from pathlib import Path, PurePath
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from typing import Awaitable, Callable, Iterable, Protocol
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import pytest
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from textual.geometry import Offset
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from textual.pilot import Pilot
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from textual.widgets import Input
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class SnapCompareType(Protocol):
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\"""Type of the function returned by the snap_compare fixture.\"""
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def __call__(
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self,
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app_path: str | PurePath,
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press: Iterable[str] = (),
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terminal_size: tuple[int, int] = (80, 24),
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run_before: Callable[[Pilot], Awaitable[None] | None] | None = None, # type: ignore
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) -> bool:
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...
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# Relative paths are treated as relative to this file, when using snap_compare.
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APP_PATH = Path({self.app_path!r})
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# Prevent flaky tests due to timing issues.
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Input.cursor_blink = False # type: ignore
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def test_playback(snap_compare: SnapCompareType):
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async def automate_app(pilot: Pilot[None]):
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{indent(self.get_replay_code(), 8)}
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assert snap_compare(APP_PATH, run_before=automate_app, terminal_size=({self.app.size.width}, {self.app.size.height}))
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"""
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def save_replay(self) -> None:
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"""Save the pytest code."""
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assert self.app is not None, "app should be set by now"
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script = self.get_test_code()
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with open(self.output_file, "w") as f:
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f.write(script)
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if __name__ == "__main__":
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from textual_paint.paint import PaintApp
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recorder = PilotRecorder(PaintApp, "../src/textual_paint/paint.py")
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recorder.run()
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