comparison mercurial/merge.py @ 6375:cdc458b12f0f

update: better logic and messages for updates

- complain about attempts to merge with ancestor
- when updating, differentiate between
  - crossing named branches with no local changes (jump)
  - crossing named branches with local changes (complain)
  - nonlinear update on the same named branch, no changes (complain some more)
  - nonlinear update on the same named branch, changes (different complaining)

6374:31a01e3d99cc

                if wc.branch() == "default": # no default branch!
                    node = repo.lookup("tip") # update to tip
                else:
                    raise util.Abort(_("branch %s not found") % wc.branch())
        overwrite = force and not branchmerge
        forcemerge = force and branchmerge
        pl = wc.parents()
        p1, p2 = pl[0], repo.changectx(node)
        pa = p1.ancestor(p2)
        fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2)
        fastforward = False

        ### check phase
        if not overwrite and len(pl) > 1:
            raise util.Abort(_("outstanding uncommitted merges"))
        if pa == p1 or pa == p2: # is there a linear path from p1 to p2?
            if branchmerge:
                if p1.branch() != p2.branch() and pa != p2:
                    fastforward = True
                else:
                    raise util.Abort(_("there is nothing to merge, just use "
                                       "'hg update' or look at 'hg heads'"))
        elif not (overwrite or branchmerge):
            if wc.files() or wc.deleted():
                raise util.Abort(_("update spans branches, use 'hg merge' "
                                   "or 'hg update -C' to lose changes"))
            # Allow jumping branches if there are no changes
            overwrite = True
        if branchmerge and not forcemerge:
            if wc.files() or wc.deleted():
                raise util.Abort(_("outstanding uncommitted changes"))

        ### calculate phase
        action = []
        if not force:
            _checkunknown(wc, p2)

6375:cdc458b12f0f

                if wc.branch() == "default": # no default branch!
                    node = repo.lookup("tip") # update to tip
                else:
                    raise util.Abort(_("branch %s not found") % wc.branch())
        overwrite = force and not branchmerge
        pl = wc.parents()
        p1, p2 = pl[0], repo.changectx(node)
        pa = p1.ancestor(p2)
        fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2)
        fastforward = False

        ### check phase
        if not overwrite and len(pl) > 1:
            raise util.Abort(_("outstanding uncommitted merges"))
        if branchmerge:
            if pa == p2:
                raise util.Abort(_("can't merge with ancestor"))
            elif pa == p1:
                if p1.branch() != p2.branch():
                    fastforward = True
                else:
                    raise util.Abort(_("nothing to merge (use 'hg update'"
                                       " or check 'hg heads')"))
            if not force and (wc.files() or wc.deleted()):
                raise util.Abort(_("outstanding uncommitted changes"))
        elif not overwrite:
            if pa == p1 or pa == p2: # linear
                pass # all good
            elif p1.branch() == p2.branch():
                if wc.files() or wc.deleted():
                    raise util.Abort(_("crosses branches (use 'hg merge' or "
                                       "'hg update -C' to discard changes)"))
                raise util.Abort(_("crosses branches (use 'hg merge'"
                                   "or 'hg update -C')"))
            elif wc.files() or wc.deleted():
                raise util.Abort(_("crosses named branches (use "
                                   "'hg update -C' to discard changes)"))
            else:
                # Allow jumping branches if there are no changes
                overwrite = True

        ### calculate phase
        action = []
        if not force:
            _checkunknown(wc, p2)