1 files changed, 38 insertions, 0 deletions
diff --git a/lib/PublicInbox/AltId.pm b/lib/PublicInbox/AltId.pm
new file mode 100644
index 00000000..6fdc3a2d
--- /dev/null
+++ b/lib/PublicInbox/AltId.pm
@@ -0,0 +1,38 @@
+# Copyright (C) 2016 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+package PublicInbox::AltId;
+use strict;
+use warnings;
+use URI::Escape qw(uri_unescape);
+
+# spec: TYPE:PREFIX:param1=value1&param2=value2&...
+# Example: serial:gmane:file=/path/to/altmsgmap.sqlite3
+sub new {
+        my ($class, $inbox, $spec) = @_;
+        my ($type, $prefix, $query) = split(/:/, $spec, 3);
+        $type eq 'serial' or die "non-serial not supported, yet\n";
+
+        require PublicInbox::Msgmap;
+
+        my %params = map {
+                my ($k, $v) = split(/=/, uri_unescape($_), 2);
+                $v = '' unless defined $v;
+                ($k, $v);
+        } split(/[&;]/, $query);
+        my $f = $params{file} or die "file: required for $type spec $spec\n";
+        unless (index($f, '/') == 0) {
+                $f = "$inbox->{mainrepo}/public-inbox/$f";
+        }
+        bless {
+                mm_alt => PublicInbox::Msgmap->new_file($f),
+                xprefix => 'X'.uc($prefix),
+        }, $class;
+}
+
+sub mid2alt {
+        my ($self, $mid) = @_;
+        $self->{mm_alt}->num_for($mid);
+}
+
+1;