hide <ncursesw/ncurses.h> behind ncrswrap.*

isolate ct_dims implementation to dims.*

cursetree/dims.h

@@ -0,0 +1,23 @@
+#ifndef CURSETREE_DIMS_H
+#define CURSETREE_DIMS_H
+
+enum ct_axis {
+  AXIS_X,
+  AXIS_Y,
+};
+
+/* Stores a node's starting x,y coordinates, width, & height.
+ * NOTE: Intended for interfunction communication.
+ */
+struct ct_dims {
+  int x, y, width, height;
+};
+
+struct ct_dims *new_dims(int x, int y, int width, int height);
+struct ct_dims *dup_dims(const struct ct_dims *const dims);
+
+int bifurcate_dims(const struct ct_dims *const parent_dims,
+                   const enum ct_axis axis, const float ratio,
+                   struct ct_dims **const dims0, struct ct_dims **const dims1);
+
+#endif /* CURSETREE_DIMS_H */