--- /dev/null
+#include "config.h"
+
+#include <assert.h>
+
+#include <ccan/container_of/container_of.h>
+#include <ccan/ptrint/ptrint.h>
+
+#include <ccan/agar/agar.h>
+
+#include "simple-graphr.h"
+
+static const void *shortcut1_first_edge_r(const struct agar_graph *gr,
+ const void *nr)
+{
+ int ni = ptr2int(nr);
+
+ switch (ni) {
+ case 1:
+ case 2:
+ return int2ptr(1);
+
+ case 3:
+ return NULL;
+
+ default:
+ assert(0);
+ }
+}
+
+static const void *shortcut1_next_edge_r(const struct agar_graph *gr,
+ const void *nr, const void *e)
+{
+ int ni = ptr2int(nr);
+ int index = ptr2int(e);
+
+ switch (ni) {
+ case 1:
+ if (index == 1)
+ return int2ptr(2);
+ assert(index == 2);
+ return NULL;
+
+ case 2:
+ assert(index == 1);
+ return NULL;
+
+ default:
+ assert(0);
+ }
+}
+
+static int shortcut1_edge_info_r(const struct agar_graph *gr,
+ const void *nr, const void *e,
+ struct agar_edge_info *eir)
+{
+ int ni = ptr2int(nr);
+ int index = ptr2int(e);
+
+ switch (ni) {
+ case 1:
+ if (index == 1) {
+ eir->to = int2ptr(3);
+ eir->icost = 3;
+ } else {
+ assert(index == 2);
+ eir->to = int2ptr(2);
+ }
+ break;
+
+ case 2:
+ assert(index == 1);
+ eir->to = int2ptr(3);
+ break;
+
+ default:
+ assert(0);
+ }
+ return 0;
+}
+
+void shortcut1_graphr_init(struct shortcut1_graphr *s1gr)
+{
+ agar_init_graph(&s1gr->gr, shortcut1_first_edge_r,
+ shortcut1_next_edge_r,
+ shortcut1_edge_info_r);
+}