From af07017fa1a743252d8983d522aca787b05ca342 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Mon, 31 May 2021 16:43:45 +0100
Subject: track who's an op

---
 boha.raku | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 75 insertions(+), 5 deletions(-)

diff --git a/boha.raku b/boha.raku
index 725f00a..97240ba 100644
--- a/boha.raku
+++ b/boha.raku
@@ -7,15 +7,85 @@ my $config = from-toml(
     file => (%*ENV<BOHA_CONFIG_FILE> // $?FILE.IO.sibling('boha.toml').Str)
 );
 
+role TracksOps does IRC::Client::Plugin {
+    has %!nick-cache;
+    has $!waiting-for-names = False;
+
+    method !check-op($e) {
+        return Promise.broken('not a channel message') unless $e.?channel;
+        # if we already know whether that's an op, the cache will
+        # contain a kept promise; if we don't, we have to wait for the
+        # next 353, so we set and return a planned promise
+        return %!nick-cache{$e.channel}{$e.nick} //= Promise.new();
+    }
+
+    # response to /NAMES
+    method irc-n353($e) {
+        my ($my-nick,$equal,$channel,$names) = $e.args();
+
+        for $names.split(/\s+/) -> $name-str {
+            my $user = $name-str ~~ / ^ $<sigil> = [ '@' | '+' ]? $<nick> = [ .+ ] $ /;
+
+            # I'm not sure what `+` means
+            my $is-op = $user<sigil> eq '@';
+
+            my $value := %!nick-cache{$channel}{$user<nick>};
+            if $value ~~ Promise && $value.status ~~ Planned {
+                # someone called check-op before we saw this nick:
+                # keep the promise
+                $value.keep($is-op);
+            }
+            else {
+                # either this nick changed state, or nobody asked
+                # about it before: set a kept promise
+                $value = Promise.kept($is-op);
+            }
+        }
+
+        $!waiting-for-names = False;
+
+        return $.NEXT;
+    }
+
+    method irc-join($e) {
+        # someone (maybe us) joined the channel: update our ops map
+        #
+        # maybe we should do this every few seconds anyway…
+        Promise.in(5).then: {
+            unless ($!waiting-for-names) {
+                $e.irc.send-cmd('NAMES', $e.channel, :server($e.server));
+                $!waiting-for-names = True;
+            }
+        };
+        return $.NEXT;
+    }
+}
+
+class Boha1 does TracksOps {
+    # irc-addressed for in-channel messages
+    # irc-privmsg-me for direct messages
+
+    method irc-addressed($e) {
+        return self!check-op($e).then: sub ($promise) {
+            if ($promise.status ~~ Broken) {
+                # not a channel message?
+                return Nil;
+            }
+            if (so $promise.result) {
+                return "you're an op";
+            }
+            else {
+                return "you're a normal user";
+            }
+        };
+    }
+}
+
 .run with IRC::Client.new(
     |($config<server>),
     channels => $config<channels>.map(*.<name>),
     :debug,
     :plugins(
-        class :: does IRC::Client::Plugin {
-            # irc-addressed for in-channel messages
-            # irc-privmsg-me for direct messages
-            method irc-to-me($e) { "Boo!" }
-        },
+        Boha1.new,
     ),
 );
-- 
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