contrib/debugshell.py

bookmarks: resolve divergent bookmarks when fowarding bookmark to descendant

This patch is a follow-up to 56dd55da2f7d that resolves divergent bookmarks
between the to-be-forwarded bookmark MARK and the new descendant. This
situation can happen when pulling new changesets, updating to the divergent
bookmark, abandoning the previous changesets with strip, and then moving MARK
to MARK@N.

Test coverage is added.

# debugshell extension
"""a python shell with repo, changelog & manifest objects"""

import mercurial
import code

def debugshell(ui, repo, **opts):
    objects = {
        'mercurial': mercurial,
        'repo': repo,
        'cl': repo.changelog,
        'mf': repo.manifest,
    }
    bannermsg = "loaded repo : %s\n" \
                "using source: %s" % (repo.root,
                                      mercurial.__path__[0])
    code.interact(bannermsg, local=objects)

cmdtable = {
    "debugshell|dbsh": (debugshell, [])
}