first commit

exectrace/recorder/command_capture.py

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+from __future__ import annotations
+
+from pathlib import Path
+from typing import List, Tuple
+
+from exectrace.utils.sensitive_filter import redact_text
+
+
+def detect_history_file() -> Path | None:
+    candidates = [Path.home() / ".bash_history", Path.home() / ".zsh_history"]
+    for path in candidates:
+        if path.exists() and path.is_file():
+            return path
+    return None
+
+
+def history_line_count(history_file: Path) -> int:
+    with open(history_file, "r", encoding="utf-8", errors="ignore") as f:
+        return sum(1 for _ in f)
+
+
+def capture_commands_since(history_file: Path, start_line: int) -> Tuple[List[str], int]:
+    with open(history_file, "r", encoding="utf-8", errors="ignore") as f:
+        lines = [line.rstrip("\n") for line in f]
+
+    new_lines = lines[start_line:]
+    commands = []
+    for line in new_lines:
+        cmd = line
+        # zsh can store lines as ": <epoch>:<duration>;<command>"
+        if line.startswith(": ") and ";" in line:
+            cmd = line.split(";", 1)[1]
+        commands.append(redact_text(cmd))
+
+    return commands, len(lines)