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Bug#1073114: unburden-home-dir: stop build-depending on pcre3

From	Axel Beckert <abe@debian.org>
Newsgroups	linux.debian.bugs.dist
Subject	Bug#1073114: unburden-home-dir: stop build-depending on pcre3
Date	2024-06-14 12:10 +0200
Message-ID	<IPc2B-2RCT-1@gated-at.bofh.it> (permalink)
References	<IOENj-2twT-13@gated-at.bofh.it> <IPbpT-2R9S-3@gated-at.bofh.it> <IOENj-2twT-13@gated-at.bofh.it> <IPbpT-2R9S-3@gated-at.bofh.it>
Organization	The Debian Project

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Control: tag -1 + patch pending

Hi again

Axel Beckert wrote:
> The sole reason I use it over grep is that it supports multiline
> matches. It though seems that grep might be able to do that — albeit
> non-obviously — via "grep -Pzov", too.

Nope, even much simpler cases fail to remove just a substring from a
single line:

~ → printf 'foo\ngnarz\nbar\n' | fgrep -voz nar
~ → printf 'foo\ngnarz\nbar\n' | fgrep -ov nar

etc.

> Otherwise, I'll probably just use the original with "perl -E". It's
> just the build system trying to remove any unwanted crap (multiline
> <script> tags including their contents) from the generated HTML
> documentation.

The following change works and produces byte for byte the identical
result as "pcregrep -Mv", it's just a bit longer:

-               pcregrep -Mv '<script[^>]*>[^<]*</script>|<(form|input).*?>|</form>' | \
+               perl -E 'local $$/; my $$input=<>; $$input =~ s:<script[^>]*>[^<]*</script>\n*|<(form|input).*?>|</form>\n*::gsm; print $$input;' | \

("$$" instead of "$" is needed even inside single quotes as this is
inside a Makefile where $ is a special character already.)

		Regards, Axel
-- 
 ,''`.  |  Axel Beckert <abe@debian.org>, https://people.debian.org/~abe/
: :' :  |  Debian Developer, ftp.ch.debian.org Admin
`. `'   |  4096R: 2517 B724 C5F6 CA99 5329  6E61 2FF9 CD59 6126 16B5
  `-    |  1024D: F067 EA27 26B9 C3FC 1486  202E C09E 1D89 9593 0EDE

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Bug#1073114: unburden-home-dir: stop build-depending on pcre3 Chris Hofstaedtler <zeha@debian.org> - 2024-06-13 00:40 +0200
  Bug#1073114: unburden-home-dir: stop build-depending on pcre3 Axel Beckert <abe@debian.org> - 2024-06-14 11:30 +0200
    Bug#1073114: unburden-home-dir: stop build-depending on pcre3 Axel Beckert <abe@debian.org> - 2024-06-14 12:10 +0200

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