Add Makefile

.gitignore

@@ -2,3 +2,4 @@
 !assets/*.png
 .env
 *.sqlite3
+chessbot

Makefile

@@ -0,0 +1,13 @@
+.PHONY: build test
+
+SOURCES := main.go $(shell find chess -name '*.go')
+
+build: chessbot
+
+chessbot: $(SOURCES)
+	go build -o chessbot .
+
+test:
+	## -count=1 is used to disable cache
+	## use -run <regexp> to only run tests that match <regexp>
+	go test ./chess -v -count=1

chess/board.go

@@ -12,6 +12,7 @@ import (
 
 	"golang.org/x/image/font"
 	"golang.org/x/image/font/basicfont"
+	"golang.org/x/image/font/opentype"
 	"golang.org/x/image/math/fixed"
 )
 
@@ -197,11 +198,17 @@ func drawCoordinate(img *image.RGBA, x, y int, flipped bool) {
 		} else if !flipped {
 			color = Light
 		}
-		// TODO: use SN font and make it bold
+
+		face, err := loadFontFace("lightningvolt.ttf")
+		if err != nil {
+			log.Printf("error loading font: %v\n", err)
+			face = basicfont.Face7x13
+		}
+
 		d := &font.Drawer{
 			Dst:  img,
 			Src:  image.NewUniform(color),
-			Face: basicfont.Face7x13,
+			Face: face,
 			Dot:  origin,
 		}
 		d.DrawString(s)
@@ -214,11 +221,36 @@ func drawCoordinate(img *image.RGBA, x, y int, flipped bool) {
 	}
 
 	if row != "" {
-		origin = fixed.P((x+1)*128-12, y*128+15)
+		origin = fixed.P((x+1)*128-20, y*128+23)
 		drawString(row, origin)
 	}
 }
 
+func loadFontFace(path string) (font.Face, error) {
+	fontBytes, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	ttfFont, err := opentype.Parse(fontBytes)
+	if err != nil {
+		return nil, err
+	}
+
+	faceOptions := &opentype.FaceOptions{
+		Size:    32,
+		DPI:     72,
+		Hinting: font.HintingNone,
+	}
+
+	fontFace, err := opentype.NewFace(ttfFont, faceOptions)
+	if err != nil {
+		return nil, err
+	}
+
+	return fontFace, nil
+}
+
 func (b *Board) SetPiece(name PieceName, color Color, position string) error {
 	var (
 		piece *Piece

go.mod

@@ -3,7 +3,7 @@ module github.com/ekzyis/chessbot
 go 1.23.0
 
 require (
-	github.com/ekzyis/snappy v0.6.2
+	github.com/ekzyis/snappy v0.7.0
 	github.com/mattn/go-sqlite3 v1.14.23
 	github.com/stretchr/testify v1.9.0
 	golang.org/x/image v0.20.0
@@ -12,6 +12,7 @@ require (
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/text v0.18.0 // indirect
 	gopkg.in/guregu/null.v4 v4.0.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,7 +1,7 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/ekzyis/snappy v0.6.2 h1:iOPgoS0cSUNk8leQJku0bBgnsha/+DcYUwTYqGLINY4=
-github.com/ekzyis/snappy v0.6.2/go.mod h1:UksYI0dU0+cnzz0LQjWB1P0QQP/ghx47e4atP99a5Lk=
+github.com/ekzyis/snappy v0.7.0 h1:RcFTUHdZFTBFOnh6cG9HCL/RPK6L13qdxDrjBNZFjEM=
+github.com/ekzyis/snappy v0.7.0/go.mod h1:UksYI0dU0+cnzz0LQjWB1P0QQP/ghx47e4atP99a5Lk=
 github.com/mattn/go-sqlite3 v1.14.23 h1:gbShiuAP1W5j9UOksQ06aiiqPMxYecovVGwmTxWtuw0=
 github.com/mattn/go-sqlite3 v1.14.23/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -10,6 +10,8 @@ github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsT
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 golang.org/x/image v0.20.0 h1:7cVCUjQwfL18gyBJOmYvptfSHS8Fb3YUDtfLIZ7Nbpw=
 golang.org/x/image v0.20.0/go.mod h1:0a88To4CYVBAHp5FXJm8o7QbUl37Vd85ply1vyD8auM=
+golang.org/x/text v0.18.0 h1:XvMDiNzPAl0jr17s6W9lcaIhGUfUORdGCNsuLmPG224=
+golang.org/x/text v0.18.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/guregu/null.v4 v4.0.0 h1:1Wm3S1WEA2I26Kq+6vcW+w0gcDo44YKYD7YIEJNHDjg=

main.go

@@ -14,21 +14,54 @@ import (
 )
 
 var (
-	c = sn.GetClient()
-	// TODO: fetch our id from SN API
-	// prod: 25176 | local: 21858
-	meId = 25176
+	c  = sn.GetClient()
+	me *sn.User
 )
 
 func main() {
 
 	for {
+		updateMe()
 		tickGameStart(c)
 		tickGameProgress(c)
 		time.Sleep(15 * time.Second)
 	}
 }
 
+func updateMe() {
+	var (
+		oldMe         *sn.User
+		err           error
+		warnThreshold = 100
+	)
+
+	maybeWarn := func() {
+		if me.Privates.Sats < warnThreshold {
+			log.Printf("~~~ warning: low balance ~~~\n")
+		}
+	}
+
+	if me == nil {
+		// make sure first update is successful
+		if me, err = c.Me(); err != nil {
+			log.Fatalf("failed to fetch me: %v\n", err)
+		}
+		log.Printf("fetched me: id=%d name=%s balance=%d\n", me.Id, me.Name, me.Privates.Sats)
+		maybeWarn()
+		return
+	}
+
+	oldMe = me
+	if me, err = c.Me(); err != nil {
+		log.Printf("failed to update me: %v\n", err)
+		me = oldMe
+	} else {
+		log.Printf("updated me. balance: %d\n", me.Privates.Sats)
+	}
+
+	maybeWarn()
+}
+
 func tickGameStart(c *sn.Client) {
 	var (
 		mentions []sn.Notification
@@ -98,7 +131,7 @@ func tickGameProgress(c *sn.Client) {
 		if parent, err := c.Item(n.Item.ParentId); err != nil {
 			log.Printf("failed to fetch parent %d of %d\n", n.Item.ParentId, n.Item.Id)
 			continue
-		} else if parent.User.Id != meId {
+		} else if parent.User.Id != me.Id {
 			log.Printf("ignoring nested reply %d\n", n.Item.Id)
 			continue
 		}
@@ -147,9 +180,13 @@ func handleGameStart(req *sn.Item) error {
 	}
 
 	// reply with algebraic notation, image and info
-	info := "_A new chess game has been started!_\n\n" +
-		"_Reply with a move like `d5` to continue the game. " +
-		"See [here](https://stacker.news/chess#how-to-continue) for details._"
+	infoMove := "e4"
+	if len(b.Moves) > 0 {
+		infoMove = "e5"
+	}
+	info := fmt.Sprintf("_A new chess game has been started!_\n\n"+
+		"_Reply with a move like `%s` to continue the game. "+
+		"See [here](https://stacker.news/chess#how-to-continue) for details._", infoMove)
 	res = strings.Trim(fmt.Sprintf("%s\n\n%s\n\n%s", b.AlgebraicNotation(), imgUrl, info), " ")
 	if _, err = createComment(req.Id, res); err != nil {
 		return fmt.Errorf("failed to reply to item %d: %v\n", req.Id, err)
@@ -179,7 +216,7 @@ func handleGameProgress(req *sn.Item) error {
 	}
 
 	for _, item := range thread {
-		if item.User.Id == meId {
+		if item.User.Id == me.Id {
 			continue
 		}
 
@@ -281,6 +318,8 @@ func parseGameStart(input string) (string, error) {
 }
 
 func parseGameProgress(input string) (string, error) {
+	input = strings.Trim(input, " ")
+
 	lines := strings.Split(input, "\n")
 	words := strings.Split(input, " ")
 
@@ -308,5 +347,5 @@ func isRecent(t time.Time) bool {
 }
 
 func alreadyHandled(id int) (bool, error) {
-	return db.ItemHasReply(id, meId)
+	return db.ItemHasReply(id, me.Id)
 }

sn/sn.go

@@ -13,6 +13,7 @@ import (
 type Client = snappy.Client
 type Notification = snappy.Notification
 type Item = snappy.Item
+type User = snappy.User
 
 var (
 	c *Client