[PATCH v2 7/9] grep/pcre: support utf-8

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

In the previous change in this function, we add locale support for
single-byte encodings only. It looks like pcre only supports utf-* as
multibyte encodings, the others are left in the cold (which is
fine). We need to enable PCRE_UTF8 so pcre can parse the string
correctly before folding case.

Noticed-by: Plamen Totev <plamen.totev@abv.bg>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 grep.c                          | 2 ++
 t/t7812-grep-icase-non-ascii.sh | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/grep.c b/grep.c
index c79aa70..7c9e437 100644
--- a/grep.c
+++ b/grep.c
@@ -326,6 +326,8 @@ static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
 
 	if (opt->ignore_case) {
 		p->pcre_tables = pcre_maketables();
+		if (is_utf8_locale())
+			options |= PCRE_UTF8;
 		options |= PCRE_CASELESS;
 	}
 
diff --git a/t/t7812-grep-icase-non-ascii.sh b/t/t7812-grep-icase-non-ascii.sh
index c945589..1306cc0 100755
--- a/t/t7812-grep-icase-non-ascii.sh
+++ b/t/t7812-grep-icase-non-ascii.sh
@@ -16,6 +16,12 @@ test_expect_success GETTEXT_LOCALE 'grep literal string, no -F' '
 	git grep -i "TILRAUN: HALLÓ HEIMUR!"
 '
 
+test_expect_success GETTEXT_LOCALE,LIBPCRE 'grep pcre string' '
+	git grep --perl-regexp    "TILRAUN: H.lló Heimur!" &&
+	git grep --perl-regexp -i "TILRAUN: H.lló Heimur!" &&
+	git grep --perl-regexp -i "TILRAUN: H.LLÓ HEIMUR!"
+'
+
 test_expect_success GETTEXT_LOCALE 'grep literal string, with -F' '
 	git grep --debug -i -F "TILRAUN: Halló Heimur!"  2>&1 >/dev/null |
 		 grep fixed >debug1 &&
-- 
2.3.0.rc1.137.g477eb31