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68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
"""Pure-function diff between two snapshot states.
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A ``state`` is ``{entity_id: fingerprint}``. ``label_map`` carries
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human-readable titles for the change-log so we don't have to re-read
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workspace state when rendering history.
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"""
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from __future__ import annotations
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from datetime import datetime, timezone
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from deeptutor.services.memory.snapshot.entity import ChangeEntry
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def diff_snapshots(
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prev: dict[str, str],
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curr: dict[str, str],
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*,
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label_map: dict[str, str],
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prev_label_map: dict[str, str] | None = None,
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) -> list[ChangeEntry]:
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"""Return the change list moving ``prev`` → ``curr``.
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``label_map`` provides labels for currently-present entities;
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``prev_label_map`` (optional) is consulted for removed-entity labels.
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"""
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ts = datetime.now(tz=timezone.utc).isoformat()
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out: list[ChangeEntry] = []
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prev_keys = set(prev)
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curr_keys = set(curr)
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for entity_id in sorted(curr_keys - prev_keys):
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out.append(
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ChangeEntry(
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ts=ts,
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kind="added",
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entity_id=entity_id,
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label=label_map.get(entity_id, entity_id),
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prev_fingerprint=None,
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new_fingerprint=curr[entity_id],
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)
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)
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for entity_id in sorted(prev_keys - curr_keys):
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prior_label = (prev_label_map or {}).get(entity_id, "") or entity_id
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out.append(
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ChangeEntry(
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ts=ts,
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kind="removed",
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entity_id=entity_id,
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label=prior_label,
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prev_fingerprint=prev[entity_id],
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new_fingerprint=None,
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)
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)
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for entity_id in sorted(prev_keys & curr_keys):
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if prev[entity_id] != curr[entity_id]:
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out.append(
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ChangeEntry(
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ts=ts,
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kind="modified",
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entity_id=entity_id,
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label=label_map.get(entity_id, entity_id),
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prev_fingerprint=prev[entity_id],
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new_fingerprint=curr[entity_id],
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)
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)
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return out
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