[PATCH 1 of 4 V2] scmutil: teach the file prefetch hook to handle multiple commits

[Yuya Nishihara]

On Mon, 16 Apr 2018 15:07:09 -0400, Matt Harbison wrote:
> # HG changeset patch
> # User Matt Harbison <matt_harbison at yahoo.com>
> # Date 1523746245 14400
> #      Sat Apr 14 18:50:45 2018 -0400
> # Node ID fe6824bcc6b8228f2eb141ea96efb6797b5530d7
> # Parent  1859b9a7ddefe90971259da0793e9289fd65c63f
> scmutil: teach the file prefetch hook to handle multiple commits

Queued, thanks.

> diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
> --- a/mercurial/cmdutil.py
> +++ b/mercurial/cmdutil.py
> @@ -2258,16 +2258,15 @@ def cat(ui, repo, ctx, matcher, basefm, 
>          mfnode = ctx.manifestnode()
>          try:
>              if mfnode and mfl[mfnode].find(file)[0]:
> -                scmutil.fileprefetchhooks(repo, ctx, [file])
> +                scmutil.prefetchfiles(repo, [ctx.rev()], matcher)
>                  write(file)
>                  return 0
>          except KeyError:
>              pass
>  
> -    files = [f for f in ctx.walk(matcher)]
> -    scmutil.fileprefetchhooks(repo, ctx, files)
> -
> -    for abs in files:
> +    scmutil.prefetchfiles(repo, [ctx.rev()], matcher)

Nit: these prefetchfiles() could be moved before the fast path.