Add maze pkg

pkg/maze/cell/cell.go

@@ -0,0 +1,21 @@
+// Package cell represents a single cell in a maze grid.
+package cell
+
+import (
+	"code.chimeric.al/dwrz/minotaur/pkg/maze/direction"
+)
+
+// Cell is a bitmask of open passages from a cell to its neighbors.
+// Bit d (1 << d) is 1 when the passage in direction d is open, and 0 when a
+// wall blocks that direction.
+type Cell uint8
+
+// HasDirection reports whether the passage in direction d is open.
+func (c Cell) HasDirection(d direction.Direction) bool {
+	return c&(1<<d) != 0
+}
+
+// SetDirection opens the passage in direction d.
+func (c *Cell) SetDirection(d direction.Direction) {
+	*c |= 1 << d
+}