[PATCH 5 of 5] branchmap: use set for update code

[Augie Fackler]

On Mon, Jan 06, 2014 at 05:38:27PM -0800, pierre-yves.david at ens-lyon.org wrote:
> # HG changeset patch
> # User Pierre-Yves David <pierre-yves.david at ens-lyon.org>
> # Date 1389050371 28800
> #      Mon Jan 06 15:19:31 2014 -0800
> # Node ID a5e84385dfcb52aff31b4b3739f02d270e16dc6f
> # Parent  5edde891b488a474c9b677d0cd52569f79c44c7e
> branchmap: use set for update code

Looks like all simple straightforward cleanups, queueing.

>
> We are doing membership test and substraction. new code is marginally faster.
>
> diff --git a/mercurial/branchmap.py b/mercurial/branchmap.py
> --- a/mercurial/branchmap.py
> +++ b/mercurial/branchmap.py
> @@ -231,29 +231,28 @@ class branchcache(dict):
>          # if older branchheads are reachable from new ones, they aren't
>          # really branchheads. Note checking parents is insufficient:
>          # 1 (branch a) -> 2 (branch b) -> 3 (branch a)
>          for branch, newheadrevs in newbranches.iteritems():
>              bheads = self.setdefault(branch, [])
> -            bheadrevs = [cl.rev(node) for node in bheads]
> +            bheadset = set(cl.rev(node) for node in bheads)
>
>              # This have been tested True on all internal usage of this function.
>              # run it again in case of doubt
>              # assert not (set(bheadrevs) & set(newheadrevs))
>              newheadrevs.sort()
> -            bheadrevs.extend(newheadrevs)
> -            bheadrevs.sort()
> +            bheadset.update(newheadrevs)
>
>              # This loop prunes out two kinds of heads - heads that are
>              # superseded by a head in newheadrevs, and newheadrevs that are not
>              # heads because an existing head is their descendant.
>              while newheadrevs:
>                  latest = newheadrevs.pop()
> -                if latest not in bheadrevs:
> +                if latest not in bheadset:
>                      continue
> -                ancestors = set(cl.ancestors([latest], bheadrevs[0]))
> -                if ancestors:
> -                    bheadrevs = [b for b in bheadrevs if b not in ancestors]
> +                ancestors = set(cl.ancestors([latest], min(bheadset)))
> +                bheadset -= ancestors
> +            bheadrevs = sorted(bheadset)
>              self[branch] = [cl.node(rev) for rev in bheadrevs]
>              tiprev = bheadrevs[-1]
>              if tiprev > self.tiprev:
>                  self.tipnode = cl.node(tiprev)
>                  self.tiprev = tiprev
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