tests/testlib/ext-sidedata-4.py

dirstate-tree: Add tree traversal/iteration

Like Python’s, Rust’s iterators are "external" in that they are driven
by a caller who calls a `next` method. This is as opposed to "internal"
iterators who drive themselves and call a callback for each item.

Writing an internal iterator traversing a tree is easy with recursion,
but internal iterators cannot rely on the call stack in that way,
they must save in an explicit object all state that they need to be
preserved across two `next` calls.

This algorithm uses a `Vec` as a stack that contains what would be
local variables on the call stack if we could use recursion.

Differential Revision: https://phab.mercurial-scm.org/D10370

# coding: utf8
# ext-sidedata-4.py - small extension to test (differently still) the sidedata
# logic
#
# Simulates a server for a complex sidedata exchange.
#
# Copyright 2021 Raphaël Gomès <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

from mercurial.revlogutils import sidedata


def reposetup(ui, repo):
    repo.register_wanted_sidedata(sidedata.SD_TEST2)
    repo.register_wanted_sidedata(sidedata.SD_TEST3)