search: index byte size of a message for IMAP search

Searching for messages smaller than a certain size is allowed by
offlineimap(1), mbsync(1), and possibly other tools.  Maybe
public-inbox-watch will support it, too.

I don't see a reason to expose searching by size via WWW search
right now (but maybe in the future, I could be convinced to).

Note: we only store the byte-size of the message in git,
this is typically LF-only and we won't have the correct
size after CRLF conversion for NNTP or IMAP.

1 files changed, 8 insertions, 4 deletions

diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm
index cb669e87..f2d3b92d 100644
--- a/lib/PublicInbox/Search.pm
+++ b/lib/PublicInbox/Search.pm
@@ -5,12 +5,16 @@
 # Read-only search interface for use by the web and NNTP interfaces
 package PublicInbox::Search;
 use strict;
-use warnings;
 
 # values for searching
-use constant TS => 0;  # Received: header in Unix time
-use constant YYYYMMDD => 1; # Date: header for searching in the WWW UI
-use constant DT => 2; # Date: YYYYMMDDHHMMSS
+use constant {
+        TS => 0, # Received: header in Unix time (IMAP INTERNALDATE)
+        YYYYMMDD => 1, # Date: header for searching in the WWW UI
+        DT => 2, # Date: YYYYMMDDHHMMSS
+        BYTES => 3, # IMAP RFC822.SIZE
+        # TODO
+        # REPLYCNT => 4, # IMAP ANSWERED
+};
 
 use PublicInbox::Smsg;
 use PublicInbox::Over;