From 6ded0c1f6f34e115f6e60db0e475cf9cbce04de5 Mon Sep 17 00:00:00 2001
From: David Phillips <david@sighup.nz>
Date: Sun, 29 Sep 2019 15:16:38 +1300
Subject: Add new rough-and-ready/PoC Markov plugin

---
 Plugin/Markov.pm | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 Plugin/Markov.pm

diff --git a/Plugin/Markov.pm b/Plugin/Markov.pm
new file mode 100644
index 0000000..a8d5f8f
--- /dev/null
+++ b/Plugin/Markov.pm
@@ -0,0 +1,110 @@
+package Plugin::Markov;
+
+use strict;
+use warnings;
+use HTTP::Tiny;
+use HTML::Parser;
+use HTML::Entities;
+use utf8;
+use Encode;
+
+use IdaliusConfig qw/assert_scalar/;
+
+my $config;
+my %markov_data;
+
+sub configure
+{
+	my $self = shift;
+	my $cmdref = shift;
+	shift; # run_command
+	$config = shift;
+
+	IdaliusConfig::assert_scalar($config, $self, "chance");
+	die "chance must be non-negative" unless $config->{chance};
+
+	IdaliusConfig::assert_scalar($config, $self, "log_file");
+	die "log_file must be specified" unless $config->{log_file};
+
+	# Perform the actual learning from log file
+	die "Failed to learn markov\n" unless markov_learn();
+
+	$cmdref->($self, "markov", sub { $self->markov_cmd(@_); });
+
+	return $self;
+}
+
+sub markov_learn
+{
+	open(my $f, "<", $config->{log_file})
+		or die ("Cannot open $config->{log_file}: $!\n");
+
+	while (<$f>) {
+		chomp;
+		utf8::decode($_);
+		my @words = split /\s+/, $_;
+
+		# Learning is the same for all but last word
+		for (my $i = 0; $i < @words - 1; $i++) {
+			my $word = $words[$i];
+			my $next_word = $words[$i + 1]; # +1 safe beacuse of loop bounds
+
+			push @{$markov_data{$word}}, $next_word;
+		}
+
+		# Now handle special case; last word must be learned as being followed by EOL ("")
+		push @{$markov_data{$words[@words - 1]}}, "";
+	}
+
+	close($f);
+	return 1;
+}
+
+sub random_trigger_odds
+{
+	return int(rand(100)) < $config->{chance};
+}
+
+# FIXME factor out with other modules
+sub some
+{
+	my @choices = @_;
+	return $choices[rand(@choices)];
+}
+
+sub do_markov
+{
+	my $word = $_[0];
+	$word = some(keys %markov_data) unless $word;
+	my $message = "";
+	my $i = 0;
+	do {
+		$i++;
+		$message .= "$word ";
+		$word = some(@{$markov_data{$word}});
+	} until(not $word or $word eq "" or $i == 1000);
+
+	return $message;
+}
+
+sub markov_cmd
+{
+	my ($self, $irc, $logger, $who, $where, $ided, $rest, $no_reenter, @arguments) = @_;
+
+	my $seed = $arguments[0];
+	return do_markov($seed);
+	return "foo";
+}
+
+sub on_message
+{
+	my ($self, $logger, $who, $where, $raw_what, $what, $irc) = @_;
+
+	return "" unless random_trigger_odds();
+	return do_markov(some(split " ", $what));
+}
+
+sub on_action {
+	on_message(@_);
+}
+1;
-- 
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