lei: handle a single IMAP message in most places

"lei import" can now import a single IMAP message via
<imaps://example.com/MAILBOX/;UID=$UID>

Likewise, "lei inspect" can show the blob information for UID
URLs and "lei lcat" can display the blob without network access
if imported.

"lei lcat" also gets rid of some unused code and supports
"blob:$OIDHEX" syntax as described in the comments (and used by
our "text" output format).

v2: enforce UID in URL, fail without
v3: fix error reporting (s/fail/child_error/)

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/PublicInbox/LeiToMail.pm b/lib/PublicInbox/LeiToMail.pm
index ad6b9439..b3aec50b 100644
--- a/lib/PublicInbox/LeiToMail.pm
+++ b/lib/PublicInbox/LeiToMail.pm
@@ -702,8 +702,14 @@ sub write_mail { # via ->wq_io_do
 
 sub wq_atexit_child {
         my ($self) = @_;
-        delete $self->{wcb};
         my $lei = $self->{lei};
+        if (!$self->{-wq_worker_nr} && $lei->{lcat_blob}) {
+                for my $oid (@{$lei->{lcat_blob}}) {
+                        my $smsg = { blob => $oid, pct => 100 };
+                        write_mail($self, $smsg);
+                }
+        }
+        delete $self->{wcb};
         $lei->{ale}->git->async_wait_all;
         my $nr = delete($lei->{-nr_write}) or return;
         return if $lei->{early_mua} || !$lei->{-progress} || !$lei->{pkt_op_p};