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git-grep: Learn PCRE

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This patch teaches git-grep the --perl-regexp/-P options (naming
borrowed from GNU grep) in order to allow specifying PCRE regexes on the
command line.

PCRE has a number of features which make them more handy to use than
POSIX regexes, like consistent escaping rules, extended character
classes, ungreedy matching etc.

git isn't build with PCRE support automatically. USE_LIBPCRE environment
variable must be enabled (like `make USE_LIBPCRE=YesPlease`).

Signed-off-by: Michał Kiedrowicz <michal.kiedrowicz@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michał Kiedrowicz
2011-05-09 23:52:05 +02:00
committed by Junio C Hamano
parent a30c148aa7
commit 63e7e9d8b6
6 changed files with 107 additions and 1 deletions
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2
builtin/grep.c
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@ -781,6 +781,8 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
REG_EXTENDED),
OPT_BOOLEAN('F', "fixed-strings", &opt.fixed,
"interpret patterns as fixed strings"),
OPT_BOOLEAN('P', "perl-regexp", &opt.pcre,
"use Perl-compatible regular expressions"),
OPT_GROUP(""),
OPT_BOOLEAN('n', "line-number", &opt.linenum, "show line numbers"),
OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),