ref: 470f19bc73180395683aa1e14c96ea3c2d3a828f
dir: /cmd/chessterm/chessterm.go/
package main
import (
"fmt"
"flag"
"log"
"os"
"strconv"
"strings"
"time"
"github.com/notnil/chess"
"9fans.net/go/draw"
"disroot.org/kitzman/chessfs/pieces"
)
const (
BoardWidth = 640
BoardHeight = 704
BoardD = 64
TickerDuration = "0.5s"
)
var (
player string
gameDir string
bgcol *draw.Image
fgcol *draw.Image
squarelcol *draw.Image
squaredcol *draw.Image
piecewcol *draw.Image
piecebcol *draw.Image
display *draw.Display
screen *draw.Image
mousectl *draw.Mousectl
kbdctl *draw.Keyboardctl
)
func allocColors(bgcolf, fgcolf string) error {
rgb, err := draw.ParsePix("r8g8b8")
if err != nil {
return err
}
bgcode, err := strconv.ParseUint(bgcolf, 0, 32)
if err != nil {
return err
}
fgcode, err := strconv.ParseUint(fgcolf, 0, 32)
if err != nil {
return err
}
bgcolr := draw.Color(uint32(bgcode) << 8 | 0xff)
fgcolr := draw.Color(uint32(fgcode) << 8 | 0xff)
var lightcolr = bgcolr
var darkcolr = fgcolr
if ((uint32(bgcode) >> 0) & 0xff) + ((uint32(bgcode) >> 8) & 0xff) + ((uint32(bgcode) >> 8) & 0xff) > ((uint32(fgcode) >> 0) & 0xff) + ((uint32(fgcode) >> 8) & 0xff) + ((uint32(fgcode) >> 8) & 0xff) {
lightcolr = fgcolr
darkcolr = bgcolr
}
bgcol, err = display.AllocImage(draw.Rect(0, 0, 1, 1), rgb, true, bgcolr)
fgcol, err = display.AllocImage(draw.Rect(0, 0, 1, 1), rgb, true, fgcolr)
squarelcol = display.AllocImageMix(darkcolr, lightcolr)
squaredcol = display.AllocImageMix(lightcolr, darkcolr)
piecewcol, err = display.AllocImage(draw.Rect(0, 0, 1, 1), rgb, true, lightcolr)
piecebcol, err = display.AllocImage(draw.Rect(0, 0, 1, 1), rgb, true, darkcolr)
return nil
}
func drawStatus(status GameStatus, redraw bool) {
off := float64(BoardD / 4)
// game status and errors
if redraw || status.Status != status.LastStatus.Status {
x := int(BoardD * 1 + off)
y := int(BoardD * 9 + off)
xe := int(BoardD * 4)
ye := int(BoardD * 10)
screen.Draw(draw.Rect(x, y, xe, ye), bgcol, nil, draw.ZP)
screen.String(draw.Pt(x, y), fgcol, draw.Pt(xe, ye), display.Font, status.Status)
}
if redraw || status.Msg != status.LastStatus.Msg {
x := int(BoardD * 1 + off)
y := int(BoardD * 10 + off)
xe := int(BoardD * 4)
ye := int(BoardD * 11)
screen.Draw(draw.Rect(x, y, xe, ye), bgcol, nil, draw.ZP)
screen.String(draw.Pt(x, y), fgcol, draw.Pt(xe, ye), display.Font, status.Msg)
}
// players' time
if redraw || status.TimeWhite != status.LastStatus.TimeWhite {
x := int(BoardD * 6 + off)
y := int(BoardD * 9 + off)
xe := int(BoardD * 9)
ye := int(BoardD * 10)
screen.Draw(draw.Rect(x, y, xe, ye), bgcol, nil, draw.ZP)
screen.String(draw.Pt(x, y), fgcol, draw.Pt(xe, ye), display.Font, fmt.Sprintf("W %d", status.TimeWhite))
}
if redraw || status.TimeBlack != status.LastStatus.TimeBlack {
x := int(BoardD * 6 + off)
y := int(BoardD * 10 + off)
xe := int(BoardD * 9)
ye := int(BoardD * 11)
screen.Draw(draw.Rect(x, y, xe, ye), bgcol, nil, draw.ZP)
screen.String(draw.Pt(x, y), fgcol, draw.Pt(xe, ye), display.Font, fmt.Sprintf("B %d", status.TimeBlack))
}
}
func drawSquare(i, j int, status GameStatus, ra bool) {
var col *draw.Image
var x = BoardD * (i + 1)
var y = BoardD * (j + 1)
var redraw = ra
rgba, _ := draw.ParsePix("a8r8g8b8")
boardSquare := Selection{x: i, y: j}.ToSquare()
var square = draw.Rect(x, y, x + BoardD, y + BoardD)
// var moveColor = 0
// if player == "black" {
// moveColor = 1
// }
switch (int(i) + int(j)) % 2 {
case 0:
col = squaredcol
case 1:
col = squarelcol
}
if redraw || status.Board[boardSquare] != status.LastStatus.Board[boardSquare] {
screen.Draw(square, col, nil, draw.ZP)
}
// selected square
if status.Selected != nil &&
status.Selected.x == i &&
status.Selected.y == j {
d := BoardD / 8
marksql := draw.Rect(x + d, y + d, x + d * 2, y + d * 2)
marksqr := draw.Rect(x + BoardD - d * 2, y + d, x + BoardD - d, y + d * 2)
screen.Draw(marksql, fgcol, nil, draw.ZP)
screen.Draw(marksqr, bgcol, nil, draw.ZP)
}
// draw piece
x = BoardD * (i + 1) + BoardD / 8
y = BoardD * (j + 1) + BoardD / 8
if !redraw && status.Board[boardSquare] == status.LastStatus.Board[boardSquare] {
return
}
square = draw.Rect(0, 0, pieces.PieceSize, pieces.PieceSize)
piece, err := display.AllocImage(square, rgba, true, draw.Transparent)
switch status.Board[boardSquare].Color() {
case chess.White:
switch status.Board[boardSquare].Type() {
case chess.King:
_, err = piece.Load(square, pieces.WhiteKing)
case chess.Queen:
_, err = piece.Load(square, pieces.WhiteQueen)
case chess.Rook:
_, err = piece.Load(square, pieces.WhiteRook)
case chess.Bishop:
_, err = piece.Load(square, pieces.WhiteBishop)
case chess.Knight:
_, err = piece.Load(square, pieces.WhiteKnight)
case chess.Pawn:
_, err = piece.Load(square, pieces.WhitePawn)
}
case chess.Black:
switch status.Board[boardSquare].Type() {
case chess.King:
_, err = piece.Load(square, pieces.BlackKing)
case chess.Queen:
_, err = piece.Load(square, pieces.BlackQueen)
case chess.Rook:
_, err = piece.Load(square, pieces.BlackRook)
case chess.Bishop:
_, err = piece.Load(square, pieces.BlackBishop)
case chess.Knight:
_, err = piece.Load(square, pieces.BlackKnight)
case chess.Pawn:
_, err = piece.Load(square, pieces.BlackPawn)
}
}
if err != nil {
log.Printf("error loading piece image: %v", err)
return
}
screen.Draw(draw.Rect(x, y, x + pieces.PieceSize, y + pieces.PieceSize), piece, nil, draw.ZP)
}
func drawBoard(status GameStatus, redraw bool) {
off := BoardD / 4
var marker int
// fill screen
if redraw {
screen.Draw(screen.R, bgcol, nil, draw.ZP)
}
// draw squares
for i := 0; i < 8; i++ {
for j := 0; j < 8; j++ {
drawSquare(i, j, status, redraw)
}
}
if redraw {
// draw notation
for i := 1; i < 9; i++ {
x := BoardD * i
if player == "white" {
marker = 'A' + i - 1
} else {
marker = 'H' - i + 1
}
screen.String(draw.Pt(x + off, 0 + off), fgcol, draw.Pt(x + BoardD, 0 + BoardD), display.Font, string(marker))
}
for i := 1; i < 9; i++ {
y := BoardD * i
if player == "white" {
marker = '9' - i
} else {
marker = '0' + i
}
screen.String(draw.Pt(0 + off, y + off), fgcol, draw.Pt(0 + BoardD, y + BoardD), display.Font, string(marker))
}
for i := 1; i < 9; i++ {
y := BoardD * i
if player == "white" {
marker = '9' - i
} else {
marker = '0' + i
}
screen.String(draw.Pt(0 + BoardD * 9 + off, y + off), fgcol, draw.Pt(0 + BoardD * 10, y + BoardD), display.Font, string(marker))
}
}
drawStatus(status, redraw)
}
func getClickedSquare(x, y int) *Selection {
sqx := x / BoardD
sqy := y / BoardD
var sx int
var sy int
if sqx > 0 && sqx < 9 {
sx = sqx - 1
} else {
return nil
}
if sqy > 0 && sqy < 9 {
sy = sqy - 1
} else {
return nil
}
sel := Selection{ x: sx, y: sy }
return &sel
}
type GameStatus struct {
Status string
Msg string
TimeWhite int
TimeBlack int
Game *chess.Game
Board map[chess.Square]chess.Piece
Selected *Selection
LastStatus *GameStatus
}
type Selection struct {
x, y int
}
func (s Selection) ToSquare() chess.Square {
if player == "white" {
return chess.NewSquare(chess.File(s.x), chess.Rank(7 - s.y))
}
return chess.NewSquare(chess.File(7 - s.x), chess.Rank(s.y))
}
func (s GameStatus) Equals(n GameStatus) bool {
var isSame = true
isSame = isSame && s.Status == n.Status
isSame = isSame && s.Msg == n.Msg
isSame = isSame && s.TimeWhite == n.TimeWhite
isSame = isSame && s.TimeBlack == n.TimeBlack
// isSame = isSame && s.Selected == n.Selected
for i := 0; i < 7; i++ {
for j := 0; j < 7; j++ {
square := chess.NewSquare(chess.File(i), chess.Rank(j))
isSame = isSame && s.Board[square] == n.Board[square]
}
}
return isSame
}
func GameWatcher(upch chan GameStatus) {
timerDuration, err := time.ParseDuration(TickerDuration)
if err != nil {
log.Fatalf("watcher: malformed duration: %v\n", err)
os.Exit(1)
}
timer := time.NewTicker(timerDuration)
ctlFile := gameDir + "/ctl"
fenFile := gameDir + "/fen"
for {
<-timer.C
ctl, err := os.ReadFile(ctlFile)
if err != nil {
log.Fatalf("watcher: %v\n", err)
return
}
moves, err := os.ReadFile(fenFile)
if err != nil {
log.Fatalf("watcher: %v\n", err)
return
}
ctllines := strings.Split(string(ctl), "\n")
status := ctllines[0]
msg := ctllines[1]
if len(strings.Fields(ctllines[2])) != 3 ||
len(strings.Fields(ctllines[3])) != 3 {
log.Fatalf("watcher: ctl file format is bogus\n")
return
}
timeWhite, err := strconv.Atoi(strings.Fields(ctllines[2])[2])
if err != nil {
log.Fatalf("watcher: %v\n", err)
return
}
timeBlack, err := strconv.Atoi(strings.Fields(ctllines[3])[2])
if err != nil {
log.Fatalf("watcher: %v\n", err)
return
}
fen, err := chess.FEN(string(moves))
if err != nil {
log.Fatalf("watcher: unable to read fen: %v\n", err)
return
}
game := chess.NewGame(fen)
board := game.Position().Board().SquareMap()
gameStatus := GameStatus {
Status: status,
Msg: msg,
TimeWhite: timeWhite,
TimeBlack: timeBlack,
Game: game,
Board: board,
LastStatus: nil,
}
upch<- gameStatus
}
}
const (
CmdStart = iota
CmdSetTime
CmdDraw
CmdResign
CmdMove
)
type Command struct {
Cmdtype int
Timeamt int
Move string
}
type MoveInquiry struct {
S1 chess.Square
S2 chess.Square
Promo chess.PieceType
}
func GameCommands(cmdch chan Command) {
var err error
ctlFile := gameDir + "/ctl"
boardFile := gameDir + "/" + player
omode := os.FileMode(os.O_WRONLY)
for {
select {
case cmd := <- cmdch:
err = nil
switch cmd.Cmdtype {
case CmdStart:
err = os.WriteFile(ctlFile, []byte("start"), omode)
case CmdSetTime:
cmdstr := fmt.Sprintf("time %d", cmd.Timeamt)
err = os.WriteFile(ctlFile, []byte(cmdstr), omode)
case CmdDraw:
err = os.WriteFile(boardFile, []byte("draw"), omode)
case CmdResign:
err = os.WriteFile(boardFile, []byte("resign"), omode)
case CmdMove:
err = os.WriteFile(boardFile, []byte(cmd.Move), omode)
}
if err != nil {
log.Printf("command error: %v\n", err)
}
}
}
}
func AttemptMove(cmdch chan Command, s GameStatus, inq MoveInquiry) {
var m *chess.Move
n := chess.AlgebraicNotation{}
possibleMoves := s.Game.ValidMoves()
for _, pm := range(possibleMoves) {
var is = true
is = is && pm.S1() == inq.S1
is = is && pm.S2() == inq.S2
is = is && pm.Promo() == inq.Promo
if is {
m = pm
break
}
}
if m == nil {
return
}
move := n.Encode(s.Game.Position(), m)
cmd := Command {
Cmdtype: CmdMove,
Timeamt: 0,
Move: move,
}
cmdch<- cmd
}
const (
MenuStart = "start"
MenuDraw = "offer draw"
MenuResign = "resign"
// MenuTime = "set game time"
)
const (
MenuStartHit = iota
MenuResignHit
MenuDrawHit
// MenuTimeHit
)
const (
PromoQueen = "queen"
PromoRook = "rook"
PromoBishop = "bishop"
PromoKnight = "knight"
)
const (
PromoQueenHit = iota
PromoRookHit
PromoBishopHit
PromoKnightHit
)
func main() {
fontf := flag.String("font", "", "font path")
bgcolf := flag.String("bg", "0xffffff", "background color")
fgcolf := flag.String("fg", "0x000000", "foreground color")
flag.Parse()
if flag.NArg() != 2 {
log.Fatalf("game directory or player not supplied or extraneous arguments\n")
os.Exit(1)
}
player = flag.Args()[0]
gameDir = flag.Args()[1]
if player != "white" && player != "black" {
log.Fatalf("player %s unknown\n", player)
os.Exit(1)
}
var err error
var font string
font = *fontf
if font == "" {
font = os.Getenv("font")
} else {
os.Setenv("font", font)
}
if font == "" {
log.Fatal("font environment variable not set")
}
wsize := fmt.Sprintf("%dx%d", BoardWidth, BoardHeight)
errch := make(chan error)
display, err = draw.Init(errch, font, "chessterm", wsize)
if err != nil {
log.Fatal(err)
}
err = allocColors(*bgcolf, *fgcolf)
if err != nil {
log.Fatalf("color error: %v", err)
os.Exit(1)
}
screen = display.ScreenImage
mousectl = display.InitMouse()
kbdctl = display.InitKeyboard()
defer display.Close()
menu := &draw.Menu {
Item: []string {
MenuStart,
MenuDraw,
MenuResign,
// MenuTime,
},
}
promoMenu := &draw.Menu {
Item: []string {
PromoQueen,
PromoRook,
PromoBishop,
PromoKnight,
},
}
upch := make(chan GameStatus)
cmdch := make(chan Command)
go GameWatcher(upch)
go GameCommands(cmdch)
status := <-upch
status.LastStatus = &status
drawBoard(status, true)
display.Flush()
for {
select {
case newStatus := <-upch:
if !newStatus.Equals(status) {
newStatus.LastStatus = &status
status.LastStatus = nil
newStatus.Selected = status.Selected
drawBoard(newStatus, false)
display.Flush()
status = newStatus
}
case mouse := <-mousectl.C:
if mouse.Buttons & 2 == 2 {
mcmd := draw.MenuHit(2, mousectl, menu, nil)
var cmd = Command {
Cmdtype: CmdDraw,
Timeamt: 0,
Move: "",
}
switch mcmd {
case MenuDrawHit:
cmd.Cmdtype = CmdDraw
case MenuResignHit:
cmd.Cmdtype = CmdResign
case MenuStartHit:
cmd.Cmdtype = CmdStart
// case MenuTimeHit:
// cmd.Cmdtype = CmdSetTime
// cmd.Timeamt = 500
}
cmdch<- cmd
}
if mouse.Buttons & 1 != 1 {
continue
}
clickedSquare := getClickedSquare(mouse.X, mouse.Y)
if clickedSquare == nil {
continue
}
previousSelected := status.Selected
if status.Selected != nil &&
status.Selected.x == clickedSquare.x &&
status.Selected.y == clickedSquare.y {
status.Selected = nil
} else {
if previousSelected == nil {
sq := clickedSquare.ToSquare()
sqValue, sqOk := status.Board[sq]
if !sqOk || strings.ToLower(sqValue.Color().Name()) != player {
continue
}
}
status.Selected = clickedSquare
}
if previousSelected != nil && status.Selected != nil {
s1 := previousSelected.ToSquare()
s2 := status.Selected.ToSquare()
var promoRank = 0
var pt = chess.NoPieceType
switch player {
case "white":
promoRank = 7
case "black":
promoRank = 0
}
if s2.Rank() == chess.Rank(promoRank) && status.Board[s1].Type() == chess.Pawn {
mpt := draw.MenuHit(1, mousectl, promoMenu, nil)
switch mpt {
case PromoQueenHit:
pt = chess.Queen
case PromoRookHit:
pt = chess.Rook
case PromoBishopHit:
pt = chess.Bishop
case PromoKnightHit:
pt = chess.Knight
}
}
move := MoveInquiry {
S1: s1,
S2: s2,
Promo: pt,
}
status.Selected = nil
go AttemptMove(cmdch, status, move)
}
if previousSelected != nil {
drawSquare(previousSelected.x, previousSelected.y, status, true)
}
if status.Selected != nil {
drawSquare(status.Selected.x, status.Selected.y, status, true)
}
display.Flush()
case <-mousectl.Resize:
err := display.Attach(draw.RefNone)
if err != nil {
errch<- err
}
screen = display.ScreenImage
drawBoard(status, true)
display.Flush()
case r := <-kbdctl.C:
switch r {
case 'q':
return
case ' ':
drawBoard(status, true)
display.Flush()
}
case e := <-errch:
display.Close()
log.Fatalf("draw: %v\n", e)
os.Exit(1)
}
}
}