45 lines
1.5 KiB
Python
45 lines
1.5 KiB
Python
"""
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Author: Uyanide pywang0608@foxmail.com
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Date: 2026-04-10 08:15:31
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Description: Print output implementation for watch mode — one shot per track.
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"""
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import sys
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from . import BaseOutput, WatchState, WatchStatus
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class PrintOutput(BaseOutput):
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"""Emit full lyrics to stdout once per track transition, then stay silent.
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Deduplication is delegated to the coordinator via position_sensitive=False:
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the coordinator uses a fixed position for signatures, so on_state fires at
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most once per (status, track_key) transition rather than on every tick.
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"""
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# fixed position=0 in signatures → coordinator calls on_state only on
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# track/status transitions, never on lyric cursor advances
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position_sensitive = False
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plain: bool
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def __init__(self, plain: bool = False) -> None:
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self.plain = plain
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async def on_state(self, state: WatchState) -> None:
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if state.status == WatchStatus.FETCHING or state.status == WatchStatus.IDLE:
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return
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if state.status == WatchStatus.NO_LYRICS:
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# emit a blank line as a machine-readable sentinel for "track changed, no lyrics"
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sys.stdout.write("\n")
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sys.stdout.flush()
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elif state.status == WatchStatus.OK and state.lyrics is not None:
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lrc = state.lyrics.normalized
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if self.plain:
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text = lrc.to_plain()
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else:
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text = str(lrc)
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sys.stdout.write(text + "\n")
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sys.stdout.flush()
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