Add stateful resource navigation

go/resource/resource.go

@@ -36,20 +36,24 @@ type MenuResource struct {
 	funcFunc FuncForFunc
 }
 
+// NewMenuResource creates a new MenuResource instance.
 func NewMenuResource() *MenuResource {
 	return &MenuResource{}
 }
 
+// WithCodeGetter sets the code symbol resolver method.
 func(m *MenuResource) WithCodeGetter(codeGetter CodeFunc) *MenuResource {
 	m.codeFunc = codeGetter
 	return m
 }
 
+// WithEntryGetter sets the content symbol resolver getter method.
 func(m *MenuResource) WithEntryFuncGetter(entryFuncGetter FuncForFunc) *MenuResource {
 	m.funcFunc = entryFuncGetter
 	return m
 }
 
+// WithTemplateGetter sets the template symbol resolver method.
 func(m *MenuResource) WithTemplateGetter(templateGetter TemplateFunc) *MenuResource {
 	m.templateFunc = templateGetter
 	return m

go/resource/state.go

@@ -0,0 +1,29 @@
+package resource
+
+import (
+	"git.defalsify.org/festive/state"
+)
+
+type StateResource struct {
+	Resource
+	st *state.State
+}
+
+func ToStateResource(rs Resource) *StateResource {
+	return &StateResource{rs, nil}
+}
+
+func NewStateResource(st *state.State) *StateResource {
+	return &StateResource {
+		NewMenuResource(),
+		st,
+	}
+}
+
+func(s *StateResource) WithState(st *state.State) *StateResource {
+	if s.st != nil {
+		panic("state already set")
+	}
+	s.st = st
+	return s
+}

go/resource/state_test.go

@@ -0,0 +1,14 @@
+package resource
+
+import (
+	"testing"
+
+	"git.defalsify.org/festive/state"
+)
+
+func TestStateResourceInit(t *testing.T) {
+	st := state.NewState(0)
+	rs := NewMenuResource()
+	_ = ToStateResource(rs).WithState(&st)
+	_ = NewStateResource(&st)
+}