treewide: move glob2re to PublicInbox::Config

It seems suitable for the config class since globs are a
config/option thing.

1 files changed, 34 insertions, 0 deletions

diff --git a/lib/PublicInbox/Config.pm b/lib/PublicInbox/Config.pm
index cdf06d85..34abcea3 100644
--- a/lib/PublicInbox/Config.pm
+++ b/lib/PublicInbox/Config.pm
@@ -10,6 +10,8 @@
 package PublicInbox::Config;
 use strict;
 use v5.10.1;
+use parent qw(Exporter);
+our @EXPORT_OK = qw(glob2re);
 use PublicInbox::Inbox;
 use PublicInbox::Spawn qw(popen_rd);
 our $LD_PRELOAD = $ENV{LD_PRELOAD}; # only valid at startup
@@ -577,4 +579,36 @@ sub squote_maybe ($) {
         $val;
 }
 
+my %re_map = ( '*' => '[^/]*?', '?' => '[^/]',
+                '[' => '[', ']' => ']', ',' => ',' );
+
+sub glob2re ($) {
+        my ($re) = @_;
+        my $p = '';
+        my $in_bracket = 0;
+        my $qm = 0;
+        my $schema_host_port = '';
+
+        # don't glob URL-looking things that look like IPv6
+        if ($re =~ s!\A([a-z0-9\+]+://\[[a-f0-9\:]+\](?::[0-9]+)?/)!!i) {
+                $schema_host_port = quotemeta $1; # "http://[::1]:1234"
+        }
+        my $changes = ($re =~ s!(.)!
+                $re_map{$p eq '\\' ? '' : do {
+                        if ($1 eq '[') { ++$in_bracket }
+                        elsif ($1 eq ']') { --$in_bracket }
+                        elsif ($1 eq ',') { ++$qm } # no change
+                        $p = $1;
+                }} // do {
+                        $p = $1;
+                        ($p eq '-' && $in_bracket) ? $p : (++$qm, "\Q$p")
+                }!sge);
+        # bashism (also supported by curl): {a,b,c} => (a|b|c)
+        $changes += ($re =~ s/([^\\]*)\\\{([^,]*,[^\\]*)\\\}/
+                        (my $in_braces = $2) =~ tr!,!|!;
+                        $1."($in_braces)";
+                        /sge);
+        ($changes - $qm) ? $schema_host_port.$re : undef;
+}
+
 1;