lei: various completion improvements

"lei export-kw" no longer completes for anonymous sources.

More commands use "lei refresh-mail-sync" as a basis for their
completion work, as well.

";AUTH=ANONYMOUS@" is stripped from completions since it was
preventing bash completion from working on AUTH=ANONYMOUS IMAP
URLs.  I'm not sure if there's a better way, but all of our code
works fine without specifying AUTH=ANONYMOUS as a command-line
arg.

Finally, we fallback to using more candidates if none can
be found, allowing multiple URLs to be completed.

1 files changed, 6 insertions, 2 deletions

diff --git a/lib/PublicInbox/LeiExportKw.pm b/lib/PublicInbox/LeiExportKw.pm
index d5533a2a..cea9beeb 100644
--- a/lib/PublicInbox/LeiExportKw.pm
+++ b/lib/PublicInbox/LeiExportKw.pm
@@ -127,9 +127,13 @@ EOM
 
 sub _complete_export_kw {
         my ($lei, @argv) = @_;
-        my $lms = $lei->lms or return;
+        my $lms = $lei->lms or return ();
         my $match_cb = $lei->complete_url_prepare(\@argv);
-        map { $match_cb->($_) } $lms->folders;
+        # filter-out read-only sources:
+        my @k = grep(!m!(?://;AUTH=ANONYMOUS\@|\A(?:nntps?|s?news)://)!,
+                        $lms->folders($argv[-1], 1));
+        my @m = map { $match_cb->($_) } @k;
+        @m ? @m : @k;
 }
 
 no warnings 'once';