one way exits

go.mod

@@ -3,6 +3,7 @@ module github.com/vilmibm/hermeticum
 go 1.18
 
 require (
+	github.com/gdamore/tcell/v2 v2.4.1-0.20210905002822-f057f0a857a1
 	github.com/jackc/pgx/v4 v4.16.1
 	github.com/rivo/tview v0.0.0-20220703182358-a13d901d3386
 	google.golang.org/grpc v1.47.0
@@ -11,9 +12,7 @@ require (
 
 require (
 	github.com/gdamore/encoding v1.0.0 // indirect
-	github.com/gdamore/tcell/v2 v2.4.1-0.20210905002822-f057f0a857a1 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/google/uuid v1.3.0 // indirect
 	github.com/jackc/chunkreader/v2 v2.0.1 // indirect
 	github.com/jackc/pgconn v1.12.1 // indirect
 	github.com/jackc/pgio v1.0.0 // indirect
@@ -24,9 +23,7 @@ require (
 	github.com/jackc/puddle v1.2.1 // indirect
 	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
 	github.com/mattn/go-runewidth v0.0.13 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/rivo/uniseg v0.2.0 // indirect
-	github.com/yuin/gopher-lua v0.0.0-20221210110428-332342483e3f // indirect
 	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
 	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 // indirect
 	golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
@@ -34,3 +31,9 @@ require (
 	golang.org/x/text v0.3.7 // indirect
 	google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 // indirect
 )
+
+require (
+	github.com/google/uuid v1.3.0
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/yuin/gopher-lua v0.0.0-20221210110428-332342483e3f
+)

roadmap.md

@@ -41,6 +41,63 @@ It's tempting to have the `exits` map because of its simplicity, but it actually
 
 TODO draft something new
 
+Coming back to this after a long break, this new scheme with the exits table seems strictly worse than the tildemush approach. i don't like the amount of book keeping in the new approach--that's complexity that can lead to bugs. i think it's ultimately most elegant to just...let the exit exist in two rooms.
+
+aside: i want to think through why exits shouldn't be on a room but it's a pretty quick answer. i don't want rooms that aren't world editable to be un-connectable to other things. if someone comes along and makes room A and then never comes back, it should be tunnel-able to from other rooms. i like the idea of people finding some cobwebbed room and then building a ladder up to it from somewhere.
+
+so i'm going back to the tildemush approach. the next question is; is the exit maps a useful thing? couldn't the go handler just add a second, mirrored go handler? a handler that checks room directionality?
+
+i've added a WITCH function, goes, which takes a direction and two rooms. this WITCH function adds two `go` verb handlers--one for the direction in the `goes` invocation and then one for the reverse. i like this more than the exit map, but it does mean that exits could compete each other. can't remember if that could happen in tildemush (was the exits map stored per exit? was that guarded?).
+
+i think the competing is fine. i'm actually fine with it. i think that goes() could also add an invocation of `provides()` like this:
+
+```lua
+provides("use $this", function(args)
+  move_sender("target_room")
+end)
+```
+
+A nice idea is the ability for an exit to add flavor to an entity transitioning through it; for this I can maybe add:
+
+```lua
+goesAnd(east, "ossuary", "gallery", function(args)
+  tellSender("the door squeals harshly as you move it but allows you passage")
+end)
+```
+
+The movement is still generated.
+
+
+so the problem with all of this is that the beahvior of the exit is
+supposedly going to change based on how it is contained. however, we only
+re-read the code when the code changes. we're trying to affect game state
+as part of code compilation and that's uncool.
+
+a user would create a new exit, put all the finishing touches on it, then move
+it from their person to the room the exit originates from. WITCH would not
+recompile and no containership would update.
+
+i think the dream of goes(north, "pub") is donezo. i think the next best
+thing is goes(north, "foyer", "pub"). on execution, the sender is checked;
+if their container is the first room then they are moved to the second
+room. both cases suffer from the double containment problem. that second
+containment *cannot* be updated as part of WITCH compilation.
+
+so we're back to two options:
+- one way exits
+- special creation semantics that handle something like double containership
+
+in the interest of moving on--and of putting off special top level commands
+that exist outside of WITCH--i want to do one way exits for now. this sucks
+because all the flavor written for an exit has to be duplicated for its pair.
+
+some other ideas because i can't let go. what of a variation on the exits map
+where each exit stores a key in its has data about where it goes. this is no
+better than a dynamic handler (it's worse) and does not help the double
+containership problem.
+
+give up and do one way exits.
+
 ## server beta
 
 - [x] grpc server

server/cmd/main.go

@@ -101,53 +101,19 @@ func newServer() (*gameWorldServer, error) {
 }
 
 func (s *gameWorldServer) verbHandler(verb, rest string, sender, target db.Object) error {
+	log.Printf("VH %s %s %d %d", verb, rest, sender.ID, target.ID)
+
 	s.scriptsMutex.RLock()
 	sc, ok := s.scripts[target.ID]
 	s.scriptsMutex.RUnlock()
 	var err error
 
-	sid, _ := s.db.SessionIDForAvatar(target)
-	serverAPI := witch.ServerAPI{
-		Show: func(_ int, _ string) {},
-		Tell: func(_ int, _ string) {},
-		DB: func() db.DB {
-			return s.db
-		},
-	}
-	if sid != "" {
-		send := s.msgRouter[sid]
-		getSenderName := func(senderID int) *string {
-			senderName := "a mysterious stranger"
-
-			sender, err := s.db.GetObjectByID(senderID)
-			if err == nil {
-				senderName = sender.Data["name"]
-			} else {
-				log.Println(err.Error())
-			}
-
-			return &senderName
-		}
-		serverAPI.Show = func(senderID int, msg string) {
-			cm := proto.ClientMessage{
-				Type:    proto.ClientMessage_EMOTE,
-				Text:    msg,
-				Speaker: getSenderName(senderID),
-			}
-			send(&cm)
-		}
-		serverAPI.Tell = func(senderID int, msg string) {
-			cm := proto.ClientMessage{
-				Type:    proto.ClientMessage_OVERHEARD,
-				Text:    msg,
-				Speaker: getSenderName(senderID),
-			}
-			send(&cm)
-		}
+	getSend := func(sid string) func(*proto.ClientMessage) error {
+		return s.msgRouter[sid]
 	}
 
 	if !ok || sc == nil {
-		if sc, err = witch.NewScriptContext(serverAPI); err != nil {
+		if sc, err = witch.NewScriptContext(s.db, getSend); err != nil {
 			return err
 		}
 
@@ -239,6 +205,10 @@ func (s *gameWorldServer) Commands(stream proto.GameWorld_CommandsServer) error
 			return s.HandleError(send, err)
 		}
 
+		for _, obj := range affected {
+			log.Printf("%s heard %s from %d", obj.Data["name"], cmd.Verb, avatar.ID)
+		}
+
 		for _, o = range affected {
 			if err = s.verbHandler(cmd.Verb, cmd.Rest, *avatar, o); err != nil {
 				log.Printf("error handling verb %s for object %d: %s", cmd.Verb, o.ID, err)

server/db/db.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"log"
 	"math/rand"
+	"strings"
 
 	"github.com/google/uuid"
 	"github.com/jackc/pgx/v4/pgxpool"
@@ -30,6 +31,7 @@ type DB interface {
 	// General
 	GetObject(owner, name string) (*Object, error)
 	GetObjectByID(ID int) (*Object, error)
+	SearchObjectsByName(term string) ([]Object, error)
 
 	// Defaults
 	Ensure() error
@@ -37,10 +39,12 @@ type DB interface {
 
 	// Presence
 	SessionIDForAvatar(Object) (string, error)
+	SessionIDForObjID(int) (string, error)
 	AvatarBySessionID(string) (*Object, error)
 	BedroomBySessionID(string) (*Object, error)
 	MoveInto(toMove Object, container Object) error
-	Earshot(Object) ([]Object, error)
+	Earshot(vantage Object) ([]Object, error)
+	Resolve(vantage Object, term string) ([]Object, error)
 }
 
 type Account struct {
@@ -113,6 +117,8 @@ func (db *pgDB) Ensure() error {
 		}
 	}
 
+	// TODO for some reason, when the seen() callback runs for foyer we're calling the stub Tell instead of the sid-closured Tell. figure out why.
+
 	roomScript := `
 		seen(function()
 			tellSender(my("description"))
@@ -173,10 +179,10 @@ func (db *pgDB) Ensure() error {
 		oakDoor = &Object{
 			Data: data,
 			Script: `
-				go("north", function()
-					tellMe("the heavy door swings forward with ease. It creaks gently")
-					moveSender("system", "pub")
+				provides("get tetanus", function(args)
+					tellSender("you now have tetanus")
 				end)
+				goes(north, "pub")
 			`,
 		}
 		if err = db.CreateObject(sysAcc, oakDoor); err != nil {
@@ -372,6 +378,16 @@ func (db *pgDB) SessionIDForAvatar(obj Object) (string, error) {
 	return *sid, nil
 }
 
+func (db *pgDB) SessionIDForObjID(id int) (string, error) {
+	obj, err := db.GetObjectByID(id)
+	if err != nil {
+		return "", err
+	}
+
+	return db.SessionIDForAvatar(*obj)
+
+}
+
 func (db *pgDB) AvatarBySessionID(sid string) (avatar *Object, err error) {
 	avatar = &Object{}
 	// TODO subquery
@@ -426,7 +442,8 @@ func (db *pgDB) Earshot(obj Object) ([]Object, error) {
 	WHERE id IN (
 		SELECT contained FROM contains
 		WHERE container = (
-			SELECT container FROM contains WHERE contained = $1 LIMIT 1))`
+				SELECT container FROM contains WHERE contained = $1 LIMIT 1))
+		OR id = (SELECT container FROM contains WHERE contained = $1 LIMIT 1)`
 	rows, err := db.pool.Query(context.Background(), stmt, obj.ID)
 	if err != nil {
 		return nil, err
@@ -474,6 +491,54 @@ func (db *pgDB) GetObject(owner, name string) (obj *Object, err error) {
 	return
 }
 
+func (db *pgDB) SearchObjectsByName(term string) ([]Object, error) {
+	ctx := context.Background()
+
+	stmt := `
+		SELECT id, avatar, data, owner, script
+		FROM objects
+		WHERE data['name']::varchar LIKE $1 
+	`
+
+	rows, err := db.pool.Query(ctx, stmt, "%"+term+"%")
+	if err != nil {
+		return nil, err
+	}
+
+	out := []Object{}
+	for rows.Next() {
+		o := Object{}
+		if err = rows.Scan(
+			&o.ID,
+			&o.Avatar,
+			&o.Data,
+			&o.OwnerID,
+			&o.Script); err != nil {
+			return nil, err
+		}
+		out = append(out, o)
+	}
+
+	return out, nil
+}
+
+func (db *pgDB) Resolve(vantage Object, term string) ([]Object, error) {
+	stuff, err := db.Earshot(vantage)
+	if err != nil {
+		return nil, err
+	}
+
+	out := []Object{}
+
+	for _, o := range stuff {
+		if strings.Contains(o.Data["name"], term) {
+			out = append(out, o)
+		}
+	}
+
+	return out, nil
+}
+
 func (db *pgDB) GetAccountAvatar(account Account) (*Object, error) {
 	ctx := context.Background()
 	obj := &Object{

server/db/schema.sql

@@ -39,9 +39,3 @@ CREATE TABLE contains (
 );
 
 CREATE TYPE heading AS ENUM ('north', 'south', 'east', 'west', 'above', 'below');
-
-CREATE TABLE exits (
-  startroom integer REFERENCES objects ON DELETE CASCADE,
-  endroom   integer REFERENCES objects ON DELETE CASCADE,
-  direction heading NOT NULL
-);

server/witch/direction.go

@@ -0,0 +1,88 @@
+package witch
+
+import "fmt"
+
+const (
+	dirEast  = "_DIR_EAST"
+	dirWest  = "_DIR_WEST"
+	dirNorth = "_DIR_NORTH"
+	dirSouth = "_DIR_SOUTH"
+	dirAbove = "_DIR_ABOVE"
+	dirBelow = "_DIR_BELOW"
+)
+
+type Direction struct {
+	raw string
+}
+
+func NewDirection(raw string) Direction {
+	return Direction{raw: raw}
+}
+
+func (d Direction) Reverse() Direction {
+	raw := ""
+	switch d.raw {
+	case dirAbove:
+		raw = dirBelow
+	case dirBelow:
+		raw = dirAbove
+	case dirEast:
+		raw = dirWest
+	case dirWest:
+		raw = dirEast
+	case dirNorth:
+		raw = dirSouth
+	case dirSouth:
+		raw = dirNorth
+	}
+	return NewDirection(raw)
+}
+
+// NormalizeDirection takes a direction someone might type like "up" or "north" and returns the correct Direction struct
+func NormalizeDirection(humanDir string) (Direction, error) {
+	raw := ""
+	switch humanDir {
+	case "up":
+	case "above":
+		raw = dirAbove
+	case "down":
+	case "below":
+		raw = dirBelow
+	case "east":
+		raw = dirEast
+	case "west":
+		raw = dirWest
+	case "north":
+		raw = dirNorth
+	case "south":
+		raw = dirSouth
+	default:
+		return Direction{}, fmt.Errorf("did not understand direction '%s'", humanDir)
+	}
+
+	return NewDirection(raw), nil
+}
+
+// Human returns a string form of this direction like "above" or "north"
+func (d Direction) Human() (humanDir string) {
+	switch d.raw {
+	case dirAbove:
+		humanDir = "above"
+	case dirBelow:
+		humanDir = "below"
+	case dirEast:
+		humanDir = "east"
+	case dirWest:
+		humanDir = "west"
+	case dirNorth:
+		humanDir = "north"
+	case dirSouth:
+		humanDir = "south"
+	}
+
+	return humanDir
+}
+
+func (d Direction) Equals(o Direction) bool {
+	return d.raw == o.raw
+}

server/witch/header.go

@@ -1,62 +0,0 @@
-package witch
-
-import (
-	lua "github.com/yuin/gopher-lua"
-)
-
-func witchHas(l *lua.LState) int {
-	l.SetGlobal("_has", l.ToTable(1))
-	return 0
-}
-
-// TODO provides
-
-func witchHears(l *lua.LState) int {
-	return addHandler(l, "say")
-}
-
-func witchSees(l *lua.LState) int {
-	return addHandler(l, "emote")
-}
-
-func witchGo(l *lua.LState) int {
-	// TODO get the handler map
-	// - check if handler map has a Go handler already, exit early if so
-	// TODO register this object as an exit in DB
-	return addHandler(l, "go")
-}
-
-func witchSeen(l *lua.LState) int {
-	return addHandler(l, "look")
-}
-
-func witchMy(l *lua.LState) int {
-	hasT := l.GetGlobal("_has").(*lua.LTable)
-	val := hasT.RawGetString(l.ToString(1))
-	l.Push(val)
-	return 1
-}
-
-func witchDoes(ls *lua.LState) int {
-	// TODO how to feed events back into the server?
-	// it needs to behave like an event showing up in Commands stream
-	// this handler needs a reference to the gateway which has a channel for sending events that the server will see?
-	return 0
-}
-
-func addHandler(l *lua.LState, verb string) int {
-	pattern := l.ToString(1)
-	cb := l.ToFunction(2)
-
-	handlers := l.GetGlobal("_handlers").(*lua.LTable)
-
-	verbHandlers, ok := handlers.RawGetString(verb).(*lua.LTable)
-	if !ok {
-		verbHandlers = l.NewTable()
-		handlers.RawSetString(verb, verbHandlers)
-	}
-
-	verbHandlers.RawSetString(pattern, cb)
-
-	return 0
-}

server/witch/witch.go

@@ -1,10 +1,18 @@
 package witch
 
+/*
+
+This file is the interface between the game server and WITCH execution
+
+*/
+
 import (
 	"fmt"
 	"log"
 	"regexp"
+	"strings"
 
+	"github.com/vilmibm/hermeticum/proto"
 	"github.com/vilmibm/hermeticum/server/db"
 	lua "github.com/yuin/gopher-lua"
 )
@@ -23,10 +31,76 @@ end)
 `
 */
 
-type ServerAPI struct {
-	Tell func(int, string)
-	Show func(int, string)
-	DB   func() db.DB
+type serverAPI struct {
+	db      db.DB
+	getSend func(string) func(*proto.ClientMessage) error
+}
+
+func (s *serverAPI) Tell(fromObjID, toObjID int, msg string) {
+	log.Printf("Tell: %d %d %s", fromObjID, toObjID, msg)
+	sid, err := s.db.SessionIDForObjID(toObjID)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	if sid == "" {
+		return
+	}
+
+	from, err := s.db.GetObjectByID(fromObjID)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	speakerName := "an ethereal presence"
+	if from.Data["name"] != "" {
+		speakerName = from.Data["name"]
+	}
+
+	log.Println(sid)
+
+	send := s.getSend(sid)
+	cm := proto.ClientMessage{
+		Type:    proto.ClientMessage_OVERHEARD,
+		Text:    msg,
+		Speaker: &speakerName,
+	}
+	send(&cm)
+}
+
+func (s *serverAPI) Show(fromObjID, toObjID int, action string) {
+	sid, err := s.db.SessionIDForObjID(toObjID)
+	if err != nil {
+		log.Println(err.Error())
+		return
+	}
+
+	from, err := s.db.GetObjectByID(fromObjID)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	speakerName := "an ethereal presence"
+	if from.Data["name"] != "" {
+		speakerName = from.Data["name"]
+	}
+
+	log.Println(sid)
+
+	send := s.getSend(sid)
+	cm := proto.ClientMessage{
+		Type:    proto.ClientMessage_EMOTE,
+		Text:    action,
+		Speaker: &speakerName,
+	}
+	send(&cm)
+}
+
+func (s *serverAPI) DB() db.DB {
+	return s.db
 }
 
 type VerbContext struct {
@@ -37,14 +111,17 @@ type VerbContext struct {
 }
 
 type ScriptContext struct {
+	db        db.DB
+	getSend   func(*proto.ClientMessage) error
 	script    string
 	incoming  chan VerbContext
-	serverAPI ServerAPI
+	serverAPI serverAPI
 }
 
-func NewScriptContext(sAPI ServerAPI) (*ScriptContext, error) {
+func NewScriptContext(db db.DB, getSend func(string) func(*proto.ClientMessage) error) (*ScriptContext, error) {
 	sc := &ScriptContext{
-		serverAPI: sAPI,
+		serverAPI: serverAPI{db: db, getSend: getSend},
+		db:        db,
 	}
 	sc.incoming = make(chan VerbContext)
 
@@ -55,25 +132,54 @@ func NewScriptContext(sAPI ServerAPI) (*ScriptContext, error) {
 		for {
 			vc = <-sc.incoming
 			if vc.Target.Script != sc.script {
-				// TODO clear this object out of the exits table
 				sc.script = vc.Target.Script
 				l = lua.NewState()
-				l.SetGlobal("has", l.NewFunction(witchHas))
-				l.SetGlobal("hears", l.NewFunction(witchHears))
-				l.SetGlobal("sees", l.NewFunction(witchSees))
-				l.SetGlobal("go", l.NewFunction(witchGo))
-				l.SetGlobal("seen", l.NewFunction(witchSeen))
-				l.SetGlobal("my", l.NewFunction(witchMy))
+
+				// direction constants
+				l.SetGlobal("east", lua.LString(dirEast))
+				l.SetGlobal("west", lua.LString(dirWest))
+				l.SetGlobal("north", lua.LString(dirNorth))
+				l.SetGlobal("south", lua.LString(dirSouth))
+				l.SetGlobal("above", lua.LString(dirAbove))
+				l.SetGlobal("below", lua.LString(dirBelow))
+				l.SetGlobal("up", lua.LString(dirAbove))
+				l.SetGlobal("down", lua.LString(dirBelow))
+
+				// witch object behavior functions
+				l.SetGlobal("has", l.NewFunction(sc.wHas))
+				l.SetGlobal("hears", l.NewFunction(sc.wHears))
+				l.SetGlobal("sees", l.NewFunction(sc.wSees))
+				l.SetGlobal("goes", l.NewFunction(sc.wGoes))
+				l.SetGlobal("seen", l.NewFunction(sc.wSeen))
+				l.SetGlobal("my", l.NewFunction(sc.wMy))
+				l.SetGlobal("provides", l.NewFunction(sc.wProvides))
+
+				// witch helpers
 				l.SetGlobal("_handlers", l.NewTable())
+				l.SetGlobal("_ID", lua.LNumber(vc.Target.ID))
+
 				if err := l.DoString(vc.Target.Script); err != nil {
 					log.Printf("error parsing script %s: %s", vc.Target.Script, err.Error())
 				}
 			}
 
+			// witch action functions relative to calling context
+
 			l.SetGlobal("tellMe", l.NewFunction(func(l *lua.LState) int {
 				sender := l.GetGlobal("sender").(*lua.LTable)
 				senderID := int(lua.LVAsNumber(sender.RawGetString("ID")))
-				sc.serverAPI.Tell(senderID, l.ToString(1))
+
+				log.Printf("tellMe: %d %s", senderID, l.ToString(1))
+				sc.serverAPI.Tell(senderID, vc.Target.ID, l.ToString(1))
+				return 0
+			}))
+
+			l.SetGlobal("tellSender", l.NewFunction(func(l *lua.LState) int {
+				sender := l.GetGlobal("sender").(*lua.LTable)
+				senderID := int(lua.LVAsNumber(sender.RawGetString("ID")))
+
+				log.Printf("tellMe: %d %s", senderID, l.ToString(1))
+				sc.serverAPI.Tell(vc.Target.ID, senderID, l.ToString(1))
 				return 0
 			}))
 
@@ -83,7 +189,7 @@ func NewScriptContext(sAPI ServerAPI) (*ScriptContext, error) {
 				senderID := int(lua.LVAsNumber(sender.RawGetString("ID")))
 				owner := l.ToString(1)
 				name := l.ToString(2)
-				db := sc.serverAPI.DB()
+				db := sc.db
 				senderObj, err := db.GetObjectByID(senderID)
 				if err != nil {
 					log.Println(err.Error())
@@ -104,26 +210,33 @@ func NewScriptContext(sAPI ServerAPI) (*ScriptContext, error) {
 			l.SetGlobal("showMe", l.NewFunction(func(l *lua.LState) int {
 				sender := l.GetGlobal("sender").(*lua.LTable)
 				senderID := int(lua.LVAsNumber(sender.RawGetString("ID")))
-				sc.serverAPI.Show(senderID, l.ToString(1))
+
+				log.Printf("showMe: %d %s", senderID, l.ToString(1))
+				sc.serverAPI.Show(senderID, vc.Target.ID, l.ToString(1))
 				return 0
 			}))
 
+			// TODO showSender?
+
 			// TODO check execute permission and bail out potentially
-			log.Printf("%#v", vc)
+			//log.Printf("%#v", vc)
 
 			senderT := l.NewTable()
 			senderT.RawSetString("name", lua.LString(vc.Sender.Data["name"]))
 			senderT.RawSetString("ID", lua.LNumber(vc.Sender.ID))
 			l.SetGlobal("sender", senderT)
 			l.SetGlobal("msg", lua.LString(vc.Rest))
+			l.SetGlobal("_SENDERID", lua.LNumber(vc.Sender.ID))
 
 			handlers := l.GetGlobal("_handlers").(*lua.LTable)
 			handlers.ForEach(func(k, v lua.LValue) {
+				log.Println("checking handler verbs", k)
 				if k.String() != vc.Verb {
 					return
 				}
 				v.(*lua.LTable).ForEach(func(kk, vv lua.LValue) {
 					pattern := regexp.MustCompile(kk.String())
+					log.Println("checking handler", kk.String(), vv, pattern)
 					if pattern.MatchString(vc.Rest) {
 						// TODO TODO TODO TODO TODO
 						// this could be a remote code execution vuln; but by being here, I
@@ -144,3 +257,126 @@ func NewScriptContext(sAPI ServerAPI) (*ScriptContext, error) {
 func (sc *ScriptContext) Handle(vc VerbContext) {
 	sc.incoming <- vc
 }
+
+func (sc *ScriptContext) addHandler(l *lua.LState, verb, pattern string, cb *lua.LFunction) {
+	log.Printf("adding handler: %s %s %#v", verb, string(pattern), cb)
+
+	handlers := l.GetGlobal("_handlers").(*lua.LTable)
+
+	verbHandlers, ok := handlers.RawGetString(verb).(*lua.LTable)
+	if !ok {
+		verbHandlers = l.NewTable()
+		handlers.RawSetString(verb, verbHandlers)
+	}
+
+	verbHandlers.RawSetString(pattern, cb)
+}
+
+func (sc *ScriptContext) wMy(l *lua.LState) int {
+	hasT := l.GetGlobal("_has").(*lua.LTable)
+	val := hasT.RawGetString(l.ToString(1))
+	l.Push(val)
+	return 1
+}
+
+func (sc *ScriptContext) wHas(l *lua.LState) int {
+	l.SetGlobal("_has", l.ToTable(1))
+	return 0
+}
+
+func (sc *ScriptContext) wHears(l *lua.LState) int {
+	pattern := l.ToString(1)
+	cb := l.ToFunction(2)
+	sc.addHandler(l, "say", pattern, cb)
+	return 0
+}
+
+func (sc *ScriptContext) wSees(l *lua.LState) int {
+	pattern := l.ToString(1)
+	cb := l.ToFunction(2)
+
+	sc.addHandler(l, "emote", pattern, cb)
+	return 0
+}
+
+func (sc *ScriptContext) wSeen(l *lua.LState) int {
+	cb := l.ToFunction(1)
+	sc.addHandler(l, "look", ".*", cb)
+	return 0
+}
+
+func (sc *ScriptContext) wDoes(ls *lua.LState) int {
+	// TODO how to feed events back into the server?
+	// it needs to behave like an event showing up in Commands stream
+	// this handler needs a reference to the gateway which has a channel for sending events that the server will see?
+	return 0
+}
+
+func (sc *ScriptContext) wProvides(l *lua.LState) int {
+	// TODO test this manually
+
+	verbAndPattern := l.ToString(1)
+	cb := l.ToFunction(2)
+
+	split := strings.SplitN(verbAndPattern, " ", 2)
+	verb := split[0]
+	pattern := split[1]
+
+	sc.addHandler(l, verb, pattern, cb)
+	return 0
+}
+
+func (sc *ScriptContext) wGoes(l *lua.LState) int {
+	direction := NewDirection(l.ToString(1))
+	targetRoomTerm := l.ToString(2)
+
+	log.Printf("GOT DIRECTION %v", direction)
+
+	cb := func(l *lua.LState) (ret int) {
+		targetRoomList, err := sc.db.SearchObjectsByName(targetRoomTerm)
+		if err != nil {
+			log.Printf("failed to search for target room: %s", err.Error())
+			return
+		}
+		switch len(targetRoomList) {
+		case 0:
+			log.Printf("failed to find any matching target room. tell player somehow")
+			return
+		case 1:
+			log.Printf("found the target room")
+		default:
+			log.Printf("found too many matching target rooms. tell player somehow")
+			return
+		}
+
+		targetRoom := targetRoomList[0]
+		msg := l.GetGlobal("msg").String()
+		normalized, err := NormalizeDirection(msg)
+		if err != nil {
+			return
+		}
+
+		sender, err := sc.getSenderFromState(l)
+		if err != nil {
+			log.Printf("failed to find sender %s", err.Error())
+			return
+		}
+
+		if normalized.Equals(direction) {
+			log.Printf("MOVING SENDER TO '%s'", targetRoom.Data["name"])
+			// TODO error checking
+			sc.db.MoveInto(*sender, targetRoom)
+			sc.serverAPI.Tell(targetRoom.ID, sender.ID, fmt.Sprintf("you are now in %s", targetRoom.Data["name"]))
+		}
+		return
+	}
+
+	sc.addHandler(l, "go", ".*", l.NewFunction(cb))
+	return 0
+}
+
+func (sc *ScriptContext) getSenderFromState(l *lua.LState) (*db.Object, error) {
+	lsID := lua.LVAsNumber(l.GetGlobal("_SENDERID"))
+
+	return sc.db.GetObjectByID(int(lsID))
+}

witch_spike.lua

@@ -159,3 +159,18 @@ provides("give $this $money $unit", function(args)
     say("i need more money")
   end
 end)
+
+-- Example 3: a rusty door
+has({
+  name = "rusty metal door"
+  description = "it's almost fully consumed by rust but still heavy and solid feeling"
+})
+
+allows({
+  read = "world",
+  write = "owner"
+  carry = "owner",
+  execute = "world",
+})
+
+goes("east", "gallery")