v0.1.0 chess game in go, using external stockfish engine

internal/core/core.go

@@ -0,0 +1,53 @@
+// FILE: internal/core/core.go
+package core
+
+type State int
+
+const (
+	StateOngoing State = iota
+	StateWhiteWins
+	StateBlackWins
+	StateDraw
+	StateStalemate
+)
+
+func (s State) String() string {
+	switch s {
+	case StateWhiteWins:
+		return "White wins"
+	case StateBlackWins:
+		return "Black wins"
+	case StateDraw:
+		return "Draw"
+	case StateStalemate:
+		return "Stalemate"
+	default:
+		return "Ongoing"
+	}
+}
+
+type PlayerType int
+
+const (
+	PlayerHuman PlayerType = iota
+	PlayerComputer
+)
+
+type Player struct {
+	ID   string
+	Type PlayerType
+}
+
+type Color byte
+
+const (
+	ColorWhite Color = 'w'
+	ColorBlack Color = 'b'
+)
+
+func OppositeColor(c Color) Color {
+	if c == ColorWhite {
+		return ColorBlack
+	}
+	return ColorWhite
+}