[PATCH 5 of 6 V2] match: avoid translating glob to matcher multiple times for large sets

[Martin von Zweigbergk]

On Thu, Nov 22, 2018 at 2:26 PM Boris Feld <boris.feld at octobus.net> wrote:

> # HG changeset patch
> # User Boris Feld <boris.feld at octobus.net>
> # Date 1542916922 -3600
> #      Thu Nov 22 21:02:02 2018 +0100
> # Node ID 018578f3ab597d5ea573107e7310470de76a3907
> # Parent  4628c3cf1fc1052ca25296c8c1a42c4502b59dc9
> # EXP-Topic perf-ignore-2
> # Available At https://bitbucket.org/octobus/mercurial-devel/
> #              hg pull https://bitbucket.org/octobus/mercurial-devel/ -r
> 018578f3ab59
> match: avoid translating glob to matcher multiple times for large sets
>
> For hgignore with many globs, the resulting regexp might not fit under the
> 20K
> length limit. So the patterns need to be broken up in smaller pieces.
>

Did you see 0f6a1bdf89fb (match: handle large regexes, 2007-08-19)
and 59a9dc9562e2 (ignore: split up huge patterns, 2008-02-11)? It might be
worth trying to figure out what Python versions those commits are talking
about. Maybe we've dropped support for those versions and we can simplify
this code.
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