comparison mercurial/debugcommands.py @ 49228:b909dd35d9ab

deltas: add a debug-delta-find command to analyse delta search

See command documentation for details.

For some reason, pytype is confused by our usage of None/deltainfo variable, so
I had to quiet it.

49227:2bcf5e14bb7e

    registrar,
    repair,
    repoview,
    requirements,
    revlog,
    revset,
    revsetlang,
    scmutil,
    setdiscovery,
    simplemerge,

            )

        fm.plain(b'\n')

    fm.end()


@command(
    b'debugdirstate|debugstate',
    [

49228:b909dd35d9ab

    registrar,
    repair,
    repoview,
    requirements,
    revlog,
    revlogutils,
    revset,
    revsetlang,
    scmutil,
    setdiscovery,
    simplemerge,

            )

        fm.plain(b'\n')

    fm.end()


@command(
    b'debug-delta-find',
    cmdutil.debugrevlogopts + cmdutil.formatteropts,
    _(b'-c|-m|FILE REV'),
    optionalrepo=True,
)
def debugdeltafind(ui, repo, arg_1, arg_2=None, **opts):
    """display the computation to get to a valid delta for storing REV

    This command will replay the process used to find the "best" delta to store
    a revision and display information about all the steps used to get to that
    result.

    The revision use the revision number of the target storage (not changelog
    revision number).

    note: the process is initiated from a full text of the revision to store.
    """
    opts = pycompat.byteskwargs(opts)
    if arg_2 is None:
        file_ = None
        rev = arg_1
    else:
        file_ = arg_1
        rev = arg_2

    rev = int(rev)

    revlog = cmdutil.openrevlog(repo, b'debugdeltachain', file_, opts)

    deltacomputer = deltautil.deltacomputer(
        revlog,
        write_debug=ui.write,
        debug_search=True,
    )

    node = revlog.node(rev)
    p1r, p2r = revlog.parentrevs(rev)
    p1 = revlog.node(p1r)
    p2 = revlog.node(p2r)
    btext = [revlog.revision(rev)]
    textlen = len(btext[0])
    cachedelta = None
    flags = revlog.flags(rev)

    revinfo = revlogutils.revisioninfo(
        node,
        p1,
        p2,
        btext,
        textlen,
        cachedelta,
        flags,
    )

    fh = revlog._datafp()
    deltacomputer.finddeltainfo(revinfo, fh, target_rev=rev)


@command(
    b'debugdirstate|debugstate',
    [