feat(webui): persist agent activity events

tests/utils/test_file_edit_events.py

@@ -0,0 +1,83 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from nanobot.utils.file_edit_events import (
+    build_file_edit_end_event,
+    build_file_edit_start_event,
+    line_diff_stats,
+    prepare_file_edit_tracker,
+    read_file_snapshot,
+)
+
+
+def test_line_diff_stats_counts_replacements_insertions_and_deletions() -> None:
+    added, deleted = line_diff_stats("a\nb\nc\n", "a\nB\nc\nd\n")
+    assert (added, deleted) == (2, 1)
+
+
+def test_line_diff_stats_normalizes_crlf() -> None:
+    assert line_diff_stats("a\r\nb\r\n", "a\nb\nc\n") == (1, 0)
+
+
+def test_write_file_start_predicts_and_end_calibrates_exact_diff(tmp_path: Path) -> None:
+    target = tmp_path / "notes.txt"
+    target.write_text("old\nkeep\n", encoding="utf-8")
+    params = {"path": "notes.txt", "content": "new\nkeep\nextra\n"}
+    tracker = prepare_file_edit_tracker(
+        call_id="call-write",
+        tool_name="write_file",
+        tool=None,
+        workspace=tmp_path,
+        params=params,
+    )
+
+    assert tracker is not None
+    start = build_file_edit_start_event(tracker, params)
+    assert start == {
+        "version": 1,
+        "call_id": "call-write",
+        "tool": "write_file",
+        "path": "notes.txt",
+        "phase": "start",
+        "added": 2,
+        "deleted": 1,
+        "approximate": True,
+        "status": "editing",
+    }
+
+    target.write_text("new\nkeep\nextra\n", encoding="utf-8")
+    end = build_file_edit_end_event(tracker)
+    assert end["phase"] == "end"
+    assert end["status"] == "done"
+    assert end["approximate"] is False
+    assert (end["added"], end["deleted"]) == (2, 1)
+
+
+def test_binary_file_is_reported_but_not_counted(tmp_path: Path) -> None:
+    target = tmp_path / "data.bin"
+    target.write_bytes(b"\x00\x01before")
+    tracker = prepare_file_edit_tracker(
+        call_id="call-bin",
+        tool_name="edit_file",
+        tool=None,
+        workspace=tmp_path,
+        params={"path": "data.bin", "old_text": "before", "new_text": "after"},
+    )
+
+    assert tracker is not None
+    assert not read_file_snapshot(target).countable
+    target.write_bytes(b"\x00\x01after")
+    event = build_file_edit_end_event(tracker)
+    assert event["binary"] is True
+    assert (event["added"], event["deleted"]) == (0, 0)
+
+
+def test_untracked_tools_do_not_prepare_file_edit_tracker(tmp_path: Path) -> None:
+    assert prepare_file_edit_tracker(
+        call_id="call-exec",
+        tool_name="exec",
+        tool=None,
+        workspace=tmp_path,
+        params={"path": "created-by-shell.txt"},
+    ) is None

tests/utils/test_webui_transcript.py

@@ -42,6 +42,62 @@ def test_replay_delta_and_turn_end(tmp_path, monkeypatch) -> None:
     assert msgs[1]["latencyMs"] == 42
 
 
+def test_replay_file_edit_event_creates_file_activity(tmp_path, monkeypatch) -> None:
+    monkeypatch.setattr("nanobot.config.paths.get_data_dir", lambda: tmp_path)
+    key = "websocket:t-file"
+    for ev in (
+        {"event": "user", "chat_id": "t-file", "text": "edit"},
+        {
+            "event": "message",
+            "chat_id": "t-file",
+            "text": 'write_file({"path":"foo.txt"})',
+            "kind": "tool_hint",
+        },
+        {
+            "event": "file_edit",
+            "chat_id": "t-file",
+            "edits": [
+                {
+                    "version": 1,
+                    "call_id": "call-write",
+                    "tool": "write_file",
+                    "path": "foo.txt",
+                    "phase": "end",
+                    "added": 2,
+                    "deleted": 1,
+                    "approximate": False,
+                    "status": "done",
+                },
+            ],
+        },
+    ):
+        append_transcript_object(key, ev)
+
+    msgs = replay_transcript_to_ui_messages(read_transcript_lines(key))
+
+    assert len(msgs) == 3
+    assert msgs[1]["kind"] == "trace"
+    assert msgs[1]["traces"] == ['write_file({"path":"foo.txt"})']
+    assert "fileEdits" not in msgs[1]
+    assert msgs[2]["kind"] == "trace"
+    assert msgs[2]["traces"] == []
+    assert msgs[2]["fileEdits"] == [
+        {
+            "version": 1,
+            "call_id": "call-write",
+            "tool": "write_file",
+            "path": "foo.txt",
+            "phase": "end",
+            "added": 2,
+            "deleted": 1,
+            "approximate": False,
+            "status": "done",
+        },
+    ]
+    assert msgs[2]["activitySegmentId"]
+    assert msgs[2]["activitySegmentId"] != msgs[1]["activitySegmentId"]
+
+
 def test_build_response_schema(monkeypatch, tmp_path) -> None:
     from nanobot.utils.webui_transcript import build_webui_thread_response