reaction: add sentiment analysis; remove harass

The harass stuff may come back later.

go.mod

@@ -5,6 +5,7 @@ require (
 	github.com/PuerkitoBio/goquery v1.5.0
 	github.com/armon/go-radix v1.0.0 // indirect
 	github.com/chrissexton/leftpad v0.0.0-20181207133115-1e93189d2fff
+	github.com/chrissexton/sentiment v0.0.0-20190927141846-d69c422ba035
 	github.com/go-sql-driver/mysql v1.4.1 // indirect
 	github.com/gonum/floats v0.0.0-20181209220543-c233463c7e82 // indirect
 	github.com/gonum/internal v0.0.0-20181124074243-f884aa714029 // indirect

go.sum

@@ -10,8 +10,12 @@ github.com/andybalholm/cascadia v1.0.0 h1:hOCXnnZ5A+3eVDX8pvgl4kofXv2ELss0bKcqRy
 github.com/andybalholm/cascadia v1.0.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
 github.com/armon/go-radix v1.0.0 h1:F4z6KzEeeQIMeLFa97iZU6vupzoecKdU5TX24SNppXI=
 github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
+github.com/cdipaolo/goml v0.0.0-20190412180403-e1f51f713598 h1:j2XRGH5Y5uWtBYXGwmrjKeM/kfu/jh7ZcnrGvyN5Ttk=
+github.com/cdipaolo/goml v0.0.0-20190412180403-e1f51f713598/go.mod h1:sduMkaHcXDIWurl/Bd/z0rNEUHw5tr6LUA9IO8E9o0o=
 github.com/chrissexton/leftpad v0.0.0-20181207133115-1e93189d2fff h1:+TEqaP0eO1unI7XHHFeMDhsxhLDIb0x8KYuZbqbAmxA=
 github.com/chrissexton/leftpad v0.0.0-20181207133115-1e93189d2fff/go.mod h1:QCRjR0b4qiJiNjuP7RFM89bh4UExGJalcWmYeSvlnRc=
+github.com/chrissexton/sentiment v0.0.0-20190927141846-d69c422ba035 h1:3+eJGFTbUgOMDCpa8PTmJABs1Z3EDHRrcz6d3oXfZm0=
+github.com/chrissexton/sentiment v0.0.0-20190927141846-d69c422ba035/go.mod h1:5V55omeg+mdO+zAi38c3S9I1m5IZgdNPqiSKSXIdo88=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=

plugins/reaction/reaction.go

@@ -3,8 +3,10 @@
 package reaction
 
 import (
+	"github.com/rs/zerolog/log"
 	"math/rand"
 
+	"github.com/chrissexton/sentiment"
 	"github.com/velour/catbase/bot"
 	"github.com/velour/catbase/bot/msg"
 	"github.com/velour/catbase/config"
@@ -13,51 +15,43 @@ import (
 type ReactionPlugin struct {
 	bot    bot.Bot
 	config *config.Config
+
+	model sentiment.Models
 }
 
 func New(b bot.Bot) *ReactionPlugin {
+	model, err := sentiment.Restore()
+	if err != nil {
+		log.Fatal().Err(err).Msg("Couldn't restore sentiment model")
+	}
 	rp := &ReactionPlugin{
 		bot:    b,
 		config: b.Config(),
+		model:  model,
 	}
 	b.Register(rp, bot.Message, rp.message)
 	return rp
 }
 
 func (p *ReactionPlugin) message(c bot.Connector, kind bot.Kind, message msg.Message, args ...interface{}) bool {
-	harrass := false
-	for _, nick := range p.config.GetArray("Reaction.HarrassList", []string{}) {
-		if message.User.Name == nick {
-			harrass = true
-			break
-		}
-	}
-
 	chance := p.config.GetFloat64("Reaction.GeneralChance", 0.01)
-	negativeWeight := 1
-	if harrass {
-		chance = p.config.GetFloat64("Reaction.HarrassChance", 0.05)
-		negativeWeight = p.config.GetInt("Reaction.NegativeHarrassmentMultiplier", 2)
-	}
-
 	if rand.Float64() < chance {
-		numPositiveReactions := len(p.config.GetArray("Reaction.PositiveReactions", []string{}))
+		analysis := p.model.SentimentAnalysis(message.Body, sentiment.English)
-		numNegativeReactions := len(p.config.GetArray("Reaction.NegativeReactions", []string{}))
 
-		maxIndex := numPositiveReactions + numNegativeReactions*negativeWeight
+		log.Debug().
+			Uint8("score", analysis.Score).
+			Str("body", message.Body).
+			Msg("sentiment of statement")
 
-		index := rand.Intn(maxIndex)
+		var reactions []string
-
+		if analysis.Score > 0 {
-		reaction := ""
+			reactions = p.config.GetArray("Reaction.PositiveReactions", []string{})
-
-		if index < numPositiveReactions {
-			reaction = p.config.GetArray("Reaction.PositiveReactions", []string{})[index]
 		} else {
-			index -= numPositiveReactions
+			reactions = p.config.GetArray("Reaction.NegativeReactions", []string{})
-			index %= numNegativeReactions
-			reaction = p.config.GetArray("Reaction.NegativeReactions", []string{})[index]
 		}
 
+		reaction := reactions[rand.Intn(len(reactions))]
+
 		p.bot.Send(c, bot.Reaction, message.Channel, reaction, message)
 	}