Make some bots respond to private messages

Currently only for linkable6, notable6, releasable6 and one another
upcoming bot.

Addresses #374 (but without tests). #350 is related.

lib/Whateverable.pm6

@@ -47,7 +47,8 @@ method TWEAK {
     # wrap around everything to catch exceptions
     once { # per class
         self.^lookup(‘irc-to-me’).wrap: sub ($self, $msg) {
-            return if $msg.channel ne $CONFIG<cave> and $msg.args[1].starts-with: ‘what:’;
+            return if $msg.?channel and $msg.channel ne $CONFIG<cave>
+                      and $msg.args[1].starts-with: ‘what:’;
             # ↑ ideally this check shouldn't be here, but it's much harder otherwise
 
             LEAVE sleep 0.02; # https://github.com/Raku/whateverable/issues/163
@@ -130,7 +131,10 @@ multi method irc-privmsg-channel($msg where .text ~~ /:i [‘thank you’|‘tha
 #↓ Notices
 multi method irc-notice-me( $ --> Nil)                             {} # Issue #321
 #↓ Private messages
-multi method irc-privmsg-me($ --> ‘Sorry, it is too private here. You can join #whateverable channel instead’) {} # TODO issue #16
+method private-messages-allowed() { False }
+multi method irc-privmsg-me($ where not $.private-messages-allowed) { # TODO issue #16
+    ‘Sorry, it is too private here. You can join #whateverable channel instead’
+}
 #↓ Fallback
 multi method irc-to-me($) {
     ‘I cannot recognize this command. See wiki for some examples: ’ ~ self.get-wiki-link

xbin/Linkable.p6

@@ -25,6 +25,7 @@ unit class Linkable does Whateverable;
 method help($msg) {
     ‘Like this: R#1946 D#1234 MOAR#768 NQP#509 SPEC#242 RT#126800 S09:320 524f98cdc’
 }
+method private-messages-allowed() { True }
 
 constant %TICKET-URLS = %(
     ‘R’ | ‘RAKUDO’ | ‘GH’   => ‘https://api.github.com/repos/rakudo/rakudo/issues/’,
@@ -52,13 +53,13 @@ sub recent($what) {
 my Channel $channel-messages .= new;
 
 sub reply($msg, $answer) {
-    return if recent “$msg.channel()\0$answer”;
+    return if recent “{$msg.?channel // $msg.nick}\0$answer”;
     sleep 3 if $msg.nick eq ‘Geth’;
     $channel-messages.send: %(:$msg, :$answer)
 }
 
 start react whenever $channel-messages.Supply.throttle: 3, 3 -> $ (:$msg, :$answer) {
-    $msg.irc.send: :where($msg.channel), text => $answer;
+    $msg.irc.send: :where($msg.?channel // $msg.nick), text => $answer;
 }
 
 sub link-doc-page($msg, $match) {

xbin/Notable.p6

@@ -31,12 +31,16 @@ write %() unless $db.e;
 method help($msg) {
     “Like this: {$msg.server.current-nick}: weekly rakudo is now 10x as fast”
 }
+method private-messages-allowed() { True }
 
 sub read()       { from-json slurp $db                }
 sub write(%data) {           spurt $db, to-json %data }
 
+# XXX The logic here is a bit convoluted. It is meant to be a
+#     zero-width match (only then things work), but I don't think this
+#     was what I meant when I originaly wrote it.
 my regex shortcut($msg) { <?{ my $shortcut = $msg.args[1].split(‘:’)[0];
-                            make $shortcut if $shortcut eq @shortcuts.any      }> }
+                            make $shortcut if $msg.?channel and $shortcut eq @shortcuts.any }> }
 my regex topic { <[\w:_-]>+ }
 
 #| List topics

xbin/Releasable.p6

@@ -37,6 +37,7 @@ my $DRAFT-USER-URL   = ‘https://github.com/rakudo/rakudo/wiki/ChangeLog-Draft
 method help($msg) {
     “status | status link”
 }
+method private-messages-allowed() { True }
 
 sub ignored-commits() {
     my $last-release = to-full-commit chomp slurp “$CONFIG<rakudo>/VERSION”;