comparison mercurial/debugcommands.py @ 30529:bd5c4320b5a8

debugcommands: move 'debugdeltachain' in the new module

30528:22683f2f8100

        pp = r.parents(node)
        ui.write("\t%d -> %d\n" % (r.rev(pp[0]), i))
        if pp[1] != nullid:
            ui.write("\t%d -> %d\n" % (r.rev(pp[1]), i))
    ui.write("}\n")

30529:bd5c4320b5a8

        pp = r.parents(node)
        ui.write("\t%d -> %d\n" % (r.rev(pp[0]), i))
        if pp[1] != nullid:
            ui.write("\t%d -> %d\n" % (r.rev(pp[1]), i))
    ui.write("}\n")

@command('debugdeltachain',
    commands.debugrevlogopts + commands.formatteropts,
    _('-c|-m|FILE'),
    optionalrepo=True)
def debugdeltachain(ui, repo, file_=None, **opts):
    """dump information about delta chains in a revlog

    Output can be templatized. Available template keywords are:

    :``rev``:       revision number
    :``chainid``:   delta chain identifier (numbered by unique base)
    :``chainlen``:  delta chain length to this revision
    :``prevrev``:   previous revision in delta chain
    :``deltatype``: role of delta / how it was computed
    :``compsize``:  compressed size of revision
    :``uncompsize``: uncompressed size of revision
    :``chainsize``: total size of compressed revisions in chain
    :``chainratio``: total chain size divided by uncompressed revision size
                    (new delta chains typically start at ratio 2.00)
    :``lindist``:   linear distance from base revision in delta chain to end
                    of this revision
    :``extradist``: total size of revisions not part of this delta chain from
                    base of delta chain to end of this revision; a measurement
                    of how much extra data we need to read/seek across to read
                    the delta chain for this revision
    :``extraratio``: extradist divided by chainsize; another representation of
                    how much unrelated data is needed to load this delta chain
    """
    r = cmdutil.openrevlog(repo, 'debugdeltachain', file_, opts)
    index = r.index
    generaldelta = r.version & revlog.REVLOGGENERALDELTA

    def revinfo(rev):
        e = index[rev]
        compsize = e[1]
        uncompsize = e[2]
        chainsize = 0

        if generaldelta:
            if e[3] == e[5]:
                deltatype = 'p1'
            elif e[3] == e[6]:
                deltatype = 'p2'
            elif e[3] == rev - 1:
                deltatype = 'prev'
            elif e[3] == rev:
                deltatype = 'base'
            else:
                deltatype = 'other'
        else:
            if e[3] == rev:
                deltatype = 'base'
            else:
                deltatype = 'prev'

        chain = r._deltachain(rev)[0]
        for iterrev in chain:
            e = index[iterrev]
            chainsize += e[1]

        return compsize, uncompsize, deltatype, chain, chainsize

    fm = ui.formatter('debugdeltachain', opts)

    fm.plain('    rev  chain# chainlen     prev   delta       '
             'size    rawsize  chainsize     ratio   lindist extradist '
             'extraratio\n')

    chainbases = {}
    for rev in r:
        comp, uncomp, deltatype, chain, chainsize = revinfo(rev)
        chainbase = chain[0]
        chainid = chainbases.setdefault(chainbase, len(chainbases) + 1)
        basestart = r.start(chainbase)
        revstart = r.start(rev)
        lineardist = revstart + comp - basestart
        extradist = lineardist - chainsize
        try:
            prevrev = chain[-2]
        except IndexError:
            prevrev = -1

        chainratio = float(chainsize) / float(uncomp)
        extraratio = float(extradist) / float(chainsize)

        fm.startitem()
        fm.write('rev chainid chainlen prevrev deltatype compsize '
                 'uncompsize chainsize chainratio lindist extradist '
                 'extraratio',
                 '%7d %7d %8d %8d %7s %10d %10d %10d %9.5f %9d %9d %10.5f\n',
                 rev, chainid, len(chain), prevrev, deltatype, comp,
                 uncomp, chainsize, chainratio, lineardist, extradist,
                 extraratio,
                 rev=rev, chainid=chainid, chainlen=len(chain),
                 prevrev=prevrev, deltatype=deltatype, compsize=comp,
                 uncompsize=uncomp, chainsize=chainsize,
                 chainratio=chainratio, lindist=lineardist,
                 extradist=extradist, extraratio=extraratio)

    fm.end()