[PATCH v2] get_maintainer: correctly parse UTF-8 encoded names in files

[Alvin Šipraga]

From: Alvin Šipraga <alsi@xxxxxxxxxxxxxxx>

While the script correctly extracts UTF-8 encoded names from the
MAINTAINERS file, the regular expressions damage my name when parsing
from .yaml files. Fix this by replacing the Latin-1-compatible regular
expressions with the unicode property matcher \p{L}, which matches on
any letter according to the Unicode General Category of letters. It's
also necessary to instruct Perl to open all files with UTF-8 encoding.

The issue was also identified on the tools mailing list [1]. This should
solve the observed side effects there as well.

Link: https://lore.kernel.org/tools/20230726-gush-slouching-a5cd41@meerkat/ [1]
Signed-off-by: Alvin Šipraga <alsi@xxxxxxxxxxxxxxx>
---
Changes in v2:
- use '\p{L}' rather than '\p{Latin}', so that matching is even more
  inclusive (i.e. match also Greek letters, CJK, etc.)
- fix commit message to refer to tools mailing list, not b4 mailing list
- Link to v1: https://lore.kernel.org/r/20231014-get-maintainers-utf8-v1-1-3af8c7aeb239@xxxxxxxxxxxxxxx
---
 scripts/get_maintainer.pl | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/scripts/get_maintainer.pl b/scripts/get_maintainer.pl
index ab123b498fd9..344d0cda9854 100755
--- a/scripts/get_maintainer.pl
+++ b/scripts/get_maintainer.pl
@@ -20,6 +20,7 @@ use Getopt::Long qw(:config no_auto_abbrev);
 use Cwd;
 use File::Find;
 use File::Spec::Functions;
+use open qw(:std :encoding(UTF-8));
 
 my $cur_path = fastgetcwd() . '/';
 my $lk_path = "./";
@@ -442,7 +443,7 @@ sub maintainers_in_file {
 	my $text = do { local($/) ; <$f> };
 	close($f);
 
-	my @poss_addr = $text =~ m$[A-Za-zÀ-ÿ\"\' \,\.\+-]*\s*[\,]*\s*[\(\<\{]{0,1}[A-Za-z0-9_\.\+-]+\@[A-Za-z0-9\.-]+\.[A-Za-z0-9]+[\)\>\}]{0,1}$g;
+	my @poss_addr = $text =~ m$[\p{L}\"\' \,\.\+-]*\s*[\,]*\s*[\(\<\{]{0,1}[A-Za-z0-9_\.\+-]+\@[A-Za-z0-9\.-]+\.[A-Za-z0-9]+[\)\>\}]{0,1}$g;
 	push(@file_emails, clean_file_emails(@poss_addr));
     }
 }
@@ -2460,13 +2461,13 @@ sub clean_file_emails {
 	    $name = "";
 	}
 
-	my @nw = split(/[^A-Za-zÀ-ÿ\'\,\.\+-]/, $name);
+	my @nw = split(/[^\p{L}\'\,\.\+-]/, $name);
 	if (@nw > 2) {
 	    my $first = $nw[@nw - 3];
 	    my $middle = $nw[@nw - 2];
 	    my $last = $nw[@nw - 1];
 
-	    if (((length($first) == 1 && $first =~ m/[A-Za-z]/) ||
+	    if (((length($first) == 1 && $first =~ m/\p{L}/) ||
 		 (length($first) == 2 && substr($first, -1) eq ".")) ||
 		(length($middle) == 1 ||
 		 (length($middle) == 2 && substr($middle, -1) eq "."))) {

---
base-commit: 70f8c6f8f8800d970b10676cceae42bba51a4899
change-id: 20231014-get-maintainers-utf8-32c65c4d6f8a