Began implementing the Instruction Pointer

pkg/pointer/pointer.go

@@ -0,0 +1,21 @@
+package pointer
+
+import "git.adyxax.org/adyxax/gofunge/pkg/field"
+
+type Pointer struct {
+	x     int
+	y     int
+	delta *Delta
+}
+
+func NewPointer() *Pointer {
+	return &Pointer{delta: NewDelta(1, 0)}
+}
+
+func (p Pointer) ForkPointer() *Pointer {
+	return &p // p is already a copy
+}
+
+func (p *Pointer) Step(f field.Field) {
+	p.x, p.y = f.Step(p.x, p.y, p.delta.x, p.delta.y)
+}