5 files changed, 78 insertions, 26 deletions

diff --git a/cmd/headless_interpreter/main.go b/cmd/headless_interpreter/main.go
index 73b71dc..9bed538 100644
--- a/cmd/headless_interpreter/main.go
+++ b/cmd/headless_interpreter/main.go
@@ -38,5 +38,6 @@ func main() {
 		os.Exit(3)
 	}
 
-	interpreter.NewInterpreter(f, pointer.NewPointer()).Run()
+	v := interpreter.NewInterpreter(f, pointer.NewPointer()).Run()
+	os.Exit(v)
 }
diff --git a/pkg/interpreter/interpreter.go b/pkg/interpreter/interpreter.go
index b64e90a..76917b7 100644
--- a/pkg/interpreter/interpreter.go
+++ b/pkg/interpreter/interpreter.go
@@ -1,8 +1,6 @@
 package interpreter
 
 import (
-	"log"
-
 	"git.adyxax.org/adyxax/gofunge/pkg/field"
 	"git.adyxax.org/adyxax/gofunge/pkg/pointer"
 )
@@ -16,31 +14,29 @@ func NewInterpreter(f *field.Field, p *pointer.Pointer) *Interpreter {
 	return &Interpreter{f: f, p: p}
 }
 
-func (i *Interpreter) Run() {
+func (i *Interpreter) Run() int {
 	for i.p != nil {
-		i.Step()
+		if v := i.Step(); v != nil {
+			return *v
+		}
 	}
+	return 0
 }
 
-func (i *Interpreter) Step() {
+func (i *Interpreter) Step() *int {
 	var prev *pointer.Pointer = nil
 	for p := i.p; p != nil; p = p.Next {
-		c := p.Get(*i.f)
-		switch c {
-		case '@':
+		done, v := p.Exec(i.f)
+		if v != nil {
+			return v
+		}
+		if done {
 			if prev == nil {
 				i.p = p.Next
 			} else {
 				prev.Next = p.Next
 			}
-			break
-		case '#':
-			p.Step(*i.f)
-		default:
-			if !p.Redirect(c) {
-				log.Fatalf("Non implemented instruction code %d : %c", c, c)
-			}
 		}
-		p.Step(*i.f)
 	}
+	return nil
 }
diff --git a/pkg/pointer/exec.go b/pkg/pointer/exec.go
new file mode 100644
index 0000000..9d55136
--- /dev/null
+++ b/pkg/pointer/exec.go
@@ -0,0 +1,39 @@
+package pointer
+
+import (
+	"log"
+
+	"git.adyxax.org/adyxax/gofunge/pkg/field"
+)
+
+func (p *Pointer) Exec(f *field.Field) (done bool, returnValue *int) {
+	c := p.Get(*f)
+	for jumpingMode := false; jumpingMode || c == ' ' || c == ';'; c = p.StepAndGet(*f) {
+		if jumpingMode {
+			if c == ';' {
+				jumpingMode = false
+			}
+			continue
+		}
+	}
+	switch c {
+	case '@':
+		return true, nil
+	case '#':
+		p.Step(*f)
+	case 'j':
+		n := p.Ss.Pop()
+		for j := 0; j < n; j++ {
+			p.Step(*f)
+		}
+	case 'q':
+		v := p.Ss.Pop()
+		return true, &v
+	default:
+		if !p.Redirect(c) {
+			log.Fatalf("Non implemented instruction code %d : %c", c, c)
+		}
+	}
+	p.Step(*f)
+	return
+}
diff --git a/pkg/pointer/pointer.go b/pkg/pointer/pointer.go
index 4d847bf..902fe69 100644
--- a/pkg/pointer/pointer.go
+++ b/pkg/pointer/pointer.go
@@ -17,13 +17,13 @@ type Pointer struct {
 	sox int
 	soy int
 	// The stack
-	ss *StackStack
+	Ss *StackStack
 	// The next element for the multi-"threaded" b98 interpreter
 	Next *Pointer
 }
 
 func NewPointer() *Pointer {
-	return &Pointer{dx: 1, ss: NewStackStack()}
+	return &Pointer{dx: 1, Ss: NewStackStack()}
 }
 
 func (p Pointer) Split() *Pointer {
@@ -38,6 +38,11 @@ func (p Pointer) Get(f field.Field) int {
 	return f.Get(p.x, p.y)
 }
 
+func (p *Pointer) StepAndGet(f field.Field) int {
+	p.Step(f)
+	return p.Get(f)
+}
+
 func (p *Pointer) Set(x, y int) {
 	p.x, p.y = x, y
 }
@@ -71,8 +76,8 @@ func (p *Pointer) Redirect(c int) bool {
 	case 'r':
 		p.Reverse()
 	case 'x':
-		dy := p.ss.Pop()
-		dx := p.ss.Pop()
+		dy := p.Ss.Pop()
+		dx := p.Ss.Pop()
 		p.RedirectTo(dx, dy)
 	default:
 		return false
diff --git a/pkg/pointer/pointer_test.go b/pkg/pointer/pointer_test.go
index 4885d6b..aa007fe 100644
--- a/pkg/pointer/pointer_test.go
+++ b/pkg/pointer/pointer_test.go
@@ -9,7 +9,7 @@ import (
 )
 
 func TestNewPointer(t *testing.T) {
-	require.Equal(t, NewPointer(), &Pointer{dx: 1, ss: NewStackStack()})
+	require.Equal(t, NewPointer(), &Pointer{dx: 1, Ss: NewStackStack()})
 }
 
 func TestSplit(t *testing.T) {
@@ -23,8 +23,8 @@ func TestSplit(t *testing.T) {
 	// We check that p2 is a real copy
 	p.Step(*f)
 	p2.Step(*f)
-	require.Equal(t, &Pointer{x: 1, y: 0, dx: 1, ss: NewStackStack()}, p)
-	require.Equal(t, &Pointer{x: 1, y: 0, dx: 1, ss: NewStackStack()}, p2)
+	require.Equal(t, &Pointer{x: 1, y: 0, dx: 1, Ss: NewStackStack()}, p)
+	require.Equal(t, &Pointer{x: 1, y: 0, dx: 1, Ss: NewStackStack()}, p2)
 }
 
 func TestStep(t *testing.T) { // Step is thoroughly tested in the field package
@@ -51,6 +51,17 @@ func TestGet(t *testing.T) {
 	require.Equal(t, int('@'), v)
 }
 
+func TestStepAndGet(t *testing.T) {
+	// File of one char
+	file, err := os.Open("../field/test_data/minimal.b98")
+	require.NoError(t, err, "Failed to open file")
+	defer file.Close()
+	f, err := field.Load(file)
+	p := NewPointer()
+	v := p.StepAndGet(*f)
+	require.Equal(t, int('@'), v)
+}
+
 func TestSet(t *testing.T) {
 	p := NewPointer()
 	p.Set(3, 14)
@@ -93,8 +104,8 @@ func TestRedirect(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			p := NewPointer()
 			p.RedirectTo(3, 14)
-			p.ss.Push(2)
-			p.ss.Push(7)
+			p.Ss.Push(2)
+			p.Ss.Push(7)
 			v := p.Redirect(int(tc.input))
 			require.Equal(t, true, v)
 			require.Equal(t, tc.expectedDx, p.dx, "Invalid dx value")