Fix `/help` completion

When I removed the `/vimput` command in
84ab68f96634cc29eb63a266a30b3147fec835e5, it broke help completion. You
were no longer able to get to our help from:

    /help vi<Tab>

This was because I had removed the command, and Irssi relies on commands
in order to set up completion for `/help`.

To hack completion into `/help`, use Irssi's subcommand feature to
provide a custom `/help vimput` subcommand to `/help`, and have it
display our help as before.

1 files changed, 16 insertions, 5 deletions

diff --git a/vimput.pl b/vimput.pl
index 019ef49..1ab536e 100644
--- a/vimput.pl
+++ b/vimput.pl
@@ -189,11 +189,12 @@ sub is_ok_message {
 }
 
 
-Irssi::command_bind('help', sub {
-	if ($_[0] !~ /^vimput\s*$/) {
-		return;
-	}
-
+# Since we don't provide a command, we have to do some tricks to print help
+# output. /HELP won't list us in its output, but you can still use
+# `/help vimput`. While a `command_bind` to 'help' would work, it doesn't give
+# us completion for 'vimput'. Here, we hack the subcommand functionality to put
+# us in the completion list for `/help`.
+Irssi::command_bind('help vimput', sub {
 	my $help = <<HELP;
 %9Details:%9
 
@@ -208,6 +209,16 @@ Irssi::command_bind('help', sub {
 HELP
 
 	Irssi::print($help, MSGLEVEL_CLIENTCRAP);
+});
+
+Irssi::command_bind('help', sub {
+	my ($data, $server, $item) = @_;
+
+	if ($data !~ /^vimput\s*$/) {
+		return;
+	}
+
+	Irssi::command_runsub('help', $data, $server, $item);
 	Irssi::signal_stop();
 });