lei ls-mail-source: sort IMAP folder names

Otherwise, public-inbox-imapd will emit mailboxes in random
order (as IMAP servers do not need to guarantee any sort of
ordering).  We'll take into account numeric slice numbers
generated by -imapd if they exist, so slice "80" doesn't show up
next to "8".

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/PublicInbox/LeiLsMailSource.pm b/lib/PublicInbox/LeiLsMailSource.pm
index 71e253d9..f012e10e 100644
--- a/lib/PublicInbox/LeiLsMailSource.pm
+++ b/lib/PublicInbox/LeiLsMailSource.pm
@@ -27,6 +27,12 @@ sub input_path_url { # overrides LeiInput version
                 my $sec = $lei->{net}->can('uri_section')->($uri);
                 my $mic = $lei->{net}->mic_get($uri);
                 my $l = $mic->folders_hash($uri->path); # server-side filter
+                @$l = map { $_->[2] } # undo Schwartzian transform below:
+                        sort { $a->[0] cmp $b->[0] || $a->[1] <=> $b->[1] }
+                        map { # prepare to sort -imapd slices numerically
+                                $_->{name} =~ /\A(.+?)\.([0-9]+)\z/ ?
+                                [ $1, $2 + 0, $_ ] : [ $_->{name}, -1, $_ ];
+                        } @$l;
                 @f = map { "$sec/$_->{name}" } @$l;
                 if ($json) {
                         $_->{url} = "$sec/$_->{name}" for @$l;