allow babbles to formed with suffixes (closes #55)

plugins/babbler/babbler.go

@@ -112,6 +112,8 @@ func (p *BabblerPlugin) Message(message msg.Message) bool {
 
 	if numTokens >= 2 && tokens[1] == "says" {
 		saidWhat, saidSomething = p.getBabble(tokens)
+	} else if numTokens > 2 && tokens[1] == "syas" {
+		saidWhat, saidSomething = p.getBabbleWithSuffix(tokens)
 	} else if len(tokens) == 4 && strings.Index(lowercase, "initialize babbler for ") == 0 {
 		saidWhat, saidSomething = p.initializeBabbler(tokens)
 	} else if strings.Index(lowercase, "batch learn for ") == 0 {
@@ -493,6 +495,64 @@ func (p *BabblerPlugin) getWeightedNextWord(fromNode *BabblerNode) (*BabblerNode
 	return nil, nil, errors.New("failed to find weighted next word")
 }
 
+func (p *BabblerPlugin) getWeightedPreviousWord(toNode *BabblerNode) (*BabblerNode, *BabblerWord, bool, error) {
+	rows, err := p.db.Queryx(`select * from babblerArcs where toNodeId = ?;`, toNode.NodeId)
+	if err != nil {
+		log.Print(err)
+		return nil, nil, false, err
+	}
+	defer rows.Close()
+
+	arcs := []*BabblerArc{}
+	total := int64(0)
+	for rows.Next() {
+		var arc BabblerArc
+		err = rows.StructScan(&arc)
+		if err != nil {
+			log.Print(err)
+			return nil, nil, false, err
+		}
+		arcs = append(arcs, &arc)
+		total += arc.Frequency
+	}
+
+	if len(arcs) == 0 {
+		return nil, nil, true, nil
+	}
+
+	which := rand.Int63n(total + toNode.RootFrequency)
+
+	//terminate the babble
+	if which >= total {
+		return nil, nil, true, nil
+	}
+
+	total = 0
+	for _, arc := range arcs {
+
+		total += arc.Frequency
+
+		if total >= which {
+			var node BabblerNode
+			err := p.db.QueryRowx(`select * from babblerNodes where id = ? LIMIT 1;`, arc.FromNodeId).StructScan(&node)
+			if err != nil {
+				log.Print(err)
+				return nil, nil, false, err
+			}
+
+			var w BabblerWord
+			err = p.db.QueryRowx(`select * from babblerWords where id = ? LIMIT 1;`, node.WordId).StructScan(&w)
+			if err != nil {
+				log.Print(err)
+				return nil, nil, false, err
+			}
+			return &node, &w, false, nil
+		}
+	}
+	log.Fatalf("shouldn't happen")
+	return nil, nil, false, errors.New("failed to find weighted previous word")
+}
+
 func (p *BabblerPlugin) babble(who string) (string, error) {
 	return p.babbleSeed(who, []string{})
 }
@@ -659,3 +719,68 @@ func (p *BabblerPlugin) mergeBabblers(intoBabbler, otherBabbler *Babbler, intoNa
 
 	return err
 }
+
+
+func (p *BabblerPlugin) babbleSeedSuffix(babblerName string, seed []string) (string, error) {
+	babbler, err := p.getBabbler(babblerName)
+	if err != nil {
+		log.Print(err)
+		return "", nil
+	}
+
+	var curNode *BabblerNode
+	var firstNode *BabblerNode
+
+	//this is weird, but let's first make sure that the suffix exists "in order"
+	//because it's already writen and we need to do it anyway...
+	curNode, err = p.getBabblerNode(babbler, seed[0])
+	if err != nil {
+		log.Print(err)
+		return "", err
+	}
+	firstNode = curNode
+	for i := 1; i < len(seed); i++ {
+		nextNode, err := p.getBabblerNode(babbler, seed[i])
+		if err != nil {
+			log.Print(err)
+			return "", err
+		}
+		_, err = p.getBabblerArc(curNode, nextNode)
+		if err != nil {
+			log.Print(err)
+			return "", err
+		}
+		curNode = nextNode
+	}
+
+	words := []string{}
+	var curWord *BabblerWord
+	var shouldTerminate bool
+	curNode = firstNode
+	for {
+		curNode, curWord, shouldTerminate, err = p.getWeightedPreviousWord(curNode)
+		if err != nil {
+			log.Print(err)
+			return "", err
+		}
+
+		if shouldTerminate {
+			break
+		}
+
+		words = append(words, curWord.Word)
+
+		if len(words) >= 250 {
+			break
+		}
+	}
+
+	for i := 0; i < len(words) / 2; i++ {
+		index := len(words)-(i+1)
+		words[i], words[index] = words[index], words[i]
+	}
+
+	words = append(words, seed...)
+
+	return strings.TrimSpace(strings.Join(words, " ")), nil
+}

plugins/babbler/babbler_test.go

@@ -157,6 +157,44 @@ func TestBabblerBadSeed2(t *testing.T) {
 	assert.Contains(t, mb.Messages[0], "seabass never said 'this is a really'")
 }
 
+func TestBabblerSuffixSeed(t *testing.T) {
+	mb := bot.NewMockBot()
+	c := New(mb)
+	c.config.Babbler.DefaultUsers = []string{"seabass"}
+	assert.NotNil(t, c)
+	seabass := makeMessage("This is message one")
+	seabass.User = &user.User{Name: "seabass"}
+	res := c.Message(seabass)
+	seabass.Body = "It's easier to test with unique messages"
+	res = c.Message(seabass)
+	seabass.Body = "hi there"
+	res = c.Message(seabass)
+	res = c.Message(makeMessage("!seabass syas message one"))
+	res = c.Message(makeMessage("!seabass syas with unique"))
+	assert.Len(t, mb.Messages, 2)
+	assert.True(t, res)
+	assert.Contains(t, mb.Messages[0], "this is message one")
+	assert.Contains(t, mb.Messages[1], "it's easier to test with unique")
+}
+
+func TestBabblerBadSuffixSeed(t *testing.T) {
+	mb := bot.NewMockBot()
+	c := New(mb)
+	c.config.Babbler.DefaultUsers = []string{"seabass"}
+	assert.NotNil(t, c)
+	seabass := makeMessage("This is message one")
+	seabass.User = &user.User{Name: "seabass"}
+	res := c.Message(seabass)
+	seabass.Body = "It's easier to test with unique messages"
+	res = c.Message(seabass)
+	seabass.Body = "hi there"
+	res = c.Message(seabass)
+	res = c.Message(makeMessage("!seabass syas anything true"))
+	assert.Len(t, mb.Messages, 1)
+	assert.True(t, res)
+	assert.Contains(t, mb.Messages[0], "seabass never said 'anything true'")
+}
+
 func TestBabblerBatch(t *testing.T) {
 	mb := bot.NewMockBot()
 	c := New(mb)

plugins/babbler/commands.go

@@ -52,6 +52,31 @@ func (p *BabblerPlugin) getBabble(tokens []string) (string, bool) {
 	return "", false
 }
 
+func (p *BabblerPlugin) getBabbleWithSuffix(tokens []string) (string, bool) {
+	who := tokens[0]
+	_, err := p.getBabbler(who)
+
+	if err != nil {
+		if err == NO_BABBLER {
+			return fmt.Sprintf("%s babbler not found.", who), true
+		}
+	} else {
+
+		saying, err := p.babbleSeedSuffix(who, tokens[2:])
+
+		if err != nil {
+			if err == SAID_NOTHING {
+				return fmt.Sprintf("%s hasn't said anything yet.", who), true
+			} else if err == NEVER_SAID {
+				return fmt.Sprintf("%s never said '%s'", who, strings.Join(tokens[2:], " ")), true
+			}
+		} else if saying != "" {
+			return saying, true
+		}
+	}
+	return "", false
+}
+
 func (p *BabblerPlugin) batchLearn(tokens []string) (string, bool) {
 	who := tokens[3]
 	babblerId, err := p.getOrCreateBabbler(who)