Add zork plugin.

AUTHORS

@@ -1 +1,2 @@
 Chris Sexton <chris.sexton!@!gmail.com>
+Ethan Burns <burns.ethan@gmail.com>

main.go

@@ -10,6 +10,7 @@ import (
 	"github.com/velour/catbase/config"
 	"github.com/velour/catbase/irc"
 	"github.com/velour/catbase/plugins/admin"
+	"github.com/velour/catbase/plugins/babbler"
 	"github.com/velour/catbase/plugins/beers"
 	"github.com/velour/catbase/plugins/counter"
 	"github.com/velour/catbase/plugins/dice"
@@ -17,9 +18,9 @@ import (
 	"github.com/velour/catbase/plugins/fact"
 	"github.com/velour/catbase/plugins/leftpad"
 	"github.com/velour/catbase/plugins/reminder"
-	"github.com/velour/catbase/plugins/babbler"
 	"github.com/velour/catbase/plugins/talker"
 	"github.com/velour/catbase/plugins/your"
+	"github.com/velour/catbase/plugins/zork"
 	"github.com/velour/catbase/slack"
 )
 
@@ -55,6 +56,7 @@ func main() {
 	b.AddHandler("counter", counter.New(b))
 	b.AddHandler("reminder", reminder.New(b))
 	b.AddHandler("babbler", babbler.New(b))
+	b.AddHandler("zork", zork.New(b))
 	// catches anything left, will always return true
 	b.AddHandler("factoid", fact.New(b))
 

plugins/zork/zork.go

@@ -0,0 +1,124 @@
+// © 2016 the CatBase Authors under the WTFPL license. See AUTHORS for the list of authors.
+
+// Package zork implements a zork plugin for catbase.
+package zork
+
+import (
+	"bufio"
+	"bytes"
+	"go/build"
+	"io"
+	"log"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"github.com/velour/catbase/bot"
+	"github.com/velour/catbase/bot/msg"
+)
+
+// ZorkPlugin is a catbase plugin for playing zork.
+type ZorkPlugin struct {
+	bot bot.Bot
+	sync.Mutex
+	// zorks is a map from channels to their corresponding zork instances.
+	zorks map[string]io.WriteCloser
+}
+
+func New(b bot.Bot) bot.Handler {
+	return &ZorkPlugin{
+		bot:   b,
+		zorks: make(map[string]io.WriteCloser),
+	}
+}
+
+func (p *ZorkPlugin) runZork(ch string) error {
+	const importString = "github.com/velour/catbase/plugins/zork"
+	pkg, err := build.Import(importString, "", build.FindOnly)
+	if err != nil {
+		return err
+	}
+	zorkdat := filepath.Join(pkg.Dir, "ZORK1.DAT")
+	cmd := exec.Command("dfrotz", zorkdat)
+
+	var r io.ReadCloser
+	r, cmd.Stdout = io.Pipe()
+	cmd.Stderr = cmd.Stdout
+
+	var w io.WriteCloser
+	cmd.Stdin, w = io.Pipe()
+
+	log.Printf("zork running %s\n", cmd)
+	if err := cmd.Start(); err != nil {
+		w.Close()
+		return err
+	}
+	go func() {
+		defer r.Close()
+		s := bufio.NewScanner(r)
+		// Scan until the next prompt.
+		s.Split(func(data []byte, atEOF bool) (advance int, token []byte, err error) {
+			if atEOF && len(data) == 0 {
+				return 0, nil, nil
+			}
+			if i := bytes.Index(data, []byte{'\n', '>'}); i > 0 {
+				return i + 1, data[:i], nil
+			}
+			if atEOF {
+				return len(data), data, nil
+			}
+			return 0, nil, nil
+		})
+		for s.Scan() {
+			// Remove > and quote the whole thing.
+			m := strings.Replace(s.Text(), ">", "", -1)
+			m = strings.Replace(m, "\n", "\n>", -1)
+			m = ">" + m + "\n"
+			p.bot.SendMessage(ch, m)
+		}
+	}()
+	go func() {
+		if err := cmd.Wait(); err != nil {
+			log.Printf("zork exited: %v\n", err)
+		}
+		p.Lock()
+		p.zorks[ch] = nil
+		p.Unlock()
+	}()
+	log.Printf("zork is running in %s\n", ch)
+	p.zorks[ch] = w
+	return nil
+}
+
+func (p *ZorkPlugin) Message(message msg.Message) bool {
+	m := strings.ToLower(message.Body)
+	log.Printf("got message [%s]\n", m)
+	if ts := strings.Fields(m); len(ts) < 1 || ts[0] != "zork" {
+		return false
+	}
+	m = strings.TrimSpace(strings.TrimPrefix(m, "zork"))
+	ch := message.Channel
+
+	p.Lock()
+	defer p.Unlock()
+	if p.zorks[ch] == nil {
+		if err := p.runZork(ch); err != nil {
+			p.bot.SendMessage(ch, "failed to run zork: "+err.Error())
+			return true
+		}
+	}
+	log.Printf("zorking, [%s]\n", m)
+	io.WriteString(p.zorks[ch], m+"\n")
+	return true
+}
+
+func (p *ZorkPlugin) Event(_ string, _ msg.Message) bool { return false }
+
+func (p *ZorkPlugin) BotMessage(_ msg.Message) bool { return false }
+
+func (p *ZorkPlugin) Help(ch string, _ []string) {
+	p.bot.SendMessage(ch, "Play zork using 'zork <zork command>'.")
+}
+
+func (p *ZorkPlugin) RegisterWeb() *string { return nil }