my.fbmessenger.export: remove legacy dump_chat_history code

my/fbmessenger/export.py

@@ -9,7 +9,6 @@ REQUIRES = [
 
 from contextlib import ExitStack, contextmanager
 from dataclasses import dataclass
-from pathlib import Path
 from typing import Iterator
 
 from my.core import PathIsh, Res, stat, Stats
@@ -59,33 +58,3 @@ def messages() -> Iterator[Res[messenger.Message]]:
 
 def stats() -> Stats:
     return stat(messages)
-
-
-### vvv not sure if really belongs here...
-
-def _dump_helper(model: messenger.DAL, tdir: Path) -> None:
-    for t in model.iter_threads():
-        name = t.name.replace('/', '_') # meh..
-        path = tdir / (name + '.txt')
-        with path.open('w') as fo:
-            for m in t.iter_messages(order_by='-timestamp'):
-                # TODO would be nice to have usernames perhaps..
-                dts = m.dt.strftime('%Y-%m-%d %a %H:%M')
-                msg = f"{dts}: {m.text}"
-                print(msg, file=fo)
-
-
-def dump_chat_history(where: PathIsh) -> None:
-    p = Path(where)
-    assert not p.exists() or p.is_dir()
-
-    from shutil import rmtree
-    from tempfile import TemporaryDirectory
-    with TemporaryDirectory() as tdir, _dal() as model:
-        td = Path(tdir)
-        _dump_helper(model, td)
-
-        if p.exists():
-            rmtree(p)
-        td.rename(p)
-        td.mkdir() # ugh, hacky way of preventing complaints from context manager