comparison mercurial/copies.py @ 42707:3cffc7bbec26

copies: extract an explicit `computechangesetcopie` method from context

Right now, the logic around changeset centric copies data are buried into the
"changectx" code. We extract this code in a dedicated method (in the copies
module) for clarity. This clarity will help to explicitly compute and caches
these data in the future.

42706:60789444acd6

    for dst, src in pathcopies(repo[fromrev], repo[rev]).iteritems():
        if dst in exclude:
            continue
        if dst in wctx:
            wctx[dst].markcopied(src)

42707:3cffc7bbec26

    for dst, src in pathcopies(repo[fromrev], repo[rev]).iteritems():
        if dst in exclude:
            continue
        if dst in wctx:
            wctx[dst].markcopied(src)

def computechangesetcopies(ctx):
    """return the copies data for a changeset

    The copies data are returned as a pair of dictionnary (p1copies, p2copies).

    Each dictionnary are in the form: `{newname: oldname}`
    """
    p1copies = {}
    p2copies = {}
    p1 = ctx.p1()
    p2 = ctx.p2()
    narrowmatch = ctx._repo.narrowmatch()
    for dst in ctx.files():
        if not narrowmatch(dst) or dst not in ctx:
            continue
        copied = ctx[dst].renamed()
        if not copied:
            continue
        src, srcnode = copied
        if src in p1 and p1[src].filenode() == srcnode:
            p1copies[dst] = src
        elif src in p2 and p2[src].filenode() == srcnode:
            p2copies[dst] = src
    return p1copies, p2copies