grep/pcre: support utf-8

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 find character boundary
correctly. It's needed for case folding (when --ignore-case is used)
or '*', '+' or similar syntax is used.

The "has_non_ascii()" check is to be on the conservative side. If
there's non-ascii in the pattern, the searched content could still be
in utf-8, but we can treat it just like a byte stream and everything
should work. If we force utf-8 based on locale only and pcre validates
utf-8 and the file content is in non-utf8 encoding, things break.

Noticed-by: Plamen Totev <plamen.totev@abv.bg>
Helped-by: Plamen Totev <plamen.totev@abv.bg>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/grep.c b/grep.c
index af920c45425cddc2778cdf627c28adf6e7138fb7..0e6511fe2327e33b3013f0152ca941e382f00061 100644 (file)
--- a/grep.c
+++ b/grep.c
@@ -329,6 +329,8 @@ static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
                        p->pcre_tables = pcre_maketables();
                options |= PCRE_CASELESS;
        }
+       if (is_utf8_locale() && has_non_ascii(p->pattern))
+               options |= PCRE_UTF8;
 
        p->pcre_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
                                      p->pcre_tables);

diff --git a/t/t7812-grep-icase-non-ascii.sh b/t/t7812-grep-icase-non-ascii.sh
index 1929809d4a71f13d6cdf024a5ac63eed18c884fb..08ae4c945dee967a20bb8306938dc9ba721a9f18 100755 (executable)
--- a/t/t7812-grep-icase-non-ascii.sh
+++ b/t/t7812-grep-icase-non-ascii.sh
@@ -20,6 +20,21 @@ test_expect_success REGEX_LOCALE 'grep literal string, no -F' '
        git grep -i "TILRAUN: HALLÓ HEIMUR!"
 '
 
+test_expect_success GETTEXT_LOCALE,LIBPCRE 'grep pcre utf-8 icase' '
+       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,LIBPCRE 'grep pcre utf-8 string with "+"' '
+       test_write_lines "TILRAUN: Hallóó Heimur!" >file2 &&
+       git add file2 &&
+       git grep -l --perl-regexp "TILRAUN: H.lló+ Heimur!" >actual &&
+       echo file >expected &&
+       echo file2 >>expected &&
+       test_cmp expected actual
+'
+
 test_expect_success REGEX_LOCALE 'grep literal string, with -F' '
        git grep --debug -i -F "TILRAUN: Halló Heimur!"  2>&1 >/dev/null |
                 grep fixed >debug1 &&