structure dorne cli as a binary tree

cli/tree.h

@@ -0,0 +1,58 @@
+#ifndef DORNE_TREE_H
+#define DORNE_TREE_H
+
+# ifndef __NCURSES_H
+typedef struct _win_st WINDOW;
+# endif /* __NCURSES_H */
+
+#define NODE_CHILD_N 2
+
+/* MACRO:
+ * void NODEDIMS(struct crs_node *node, struct crs_nodedims dims);
+ */
+#define NODEDIMS(node, dims) (getbegyx(dims.y, dims.x); getmaxyx(dims.y, dims.x))
+
+enum crs_nodetype {
+  NODE_WINDOW,
+  NODE_ABSTRACT,
+};
+
+/* Stores a node's starting x,y coordinates, width, & height.
+ * NOTE: Intended for interfunction communication.
+ */
+struct crs_nodedims {
+  int x, y, width, height;
+};
+
+enum crs_axis {
+  AXIS_X,
+  AXIS_Y,
+};
+
+struct crs_node {
+  enum crs_nodetype type;
+  // union value depends on crs_node.type
+  union {
+    WINDOW *win;
+    struct {
+      float ratio;
+      struct crs_node *child[NODE_CHILD_N];
+    };
+  };
+};
+
+struct crs_tree {
+  WINDOW *stdscr;
+  struct crs_node *root;
+};
+
+/* === External Interface === */
+// struct crs_node *init_node_window(void);
+// struct crs_node *init_node_abstract(void);
+// void destroy_node(struct crs_node *node);
+
+int init_tree(struct crs_tree **tree);
+void update_tree(struct crs_tree *tree);
+void destroy_tree(struct crs_tree *tree);
+
+#endif /* DORNE_TREE_H */