41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
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"""
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A Textual Logging handler.
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If there is an active Textual app, then log messages will go via the app (and logged via textual console).
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If there is *no* active app, then log messages will go to stderr or stdout, depending on configuration.
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"""
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import sys
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from logging import Handler, LogRecord
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from textual._context import active_app
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class TextualHandler(Handler):
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"""A Logging handler for Textual apps."""
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def __init__(self, stderr: bool = True, stdout: bool = False) -> None:
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"""Initialize a Textual logging handler.
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Args:
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stderr: Log to stderr when there is no active app.
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stdout: Log to stdout when there is no active app.
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"""
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super().__init__()
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self._stderr = stderr
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self._stdout = stdout
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def emit(self, record: LogRecord) -> None:
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"""Invoked by logging."""
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message = self.format(record)
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try:
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app = active_app.get()
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except LookupError:
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if self._stderr:
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print(message, file=sys.stderr)
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elif self._stdout:
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print(message, file=sys.stdout)
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else:
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app.log.logging(message)
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