feat: simple overlay and window modes with intention setting

include/common.h

@@ -0,0 +1,15 @@
+#ifndef COMMON_H
+#define COMMON_H
+
+typedef unsigned int U32;
+
+struct date {
+  U32 day;
+  U32 month;
+  U32 year;
+};
+
+struct date to_date(char *);
+char *to_string(struct date);
+
+#endif

include/store.h

@@ -0,0 +1,10 @@
+#include <sqlite3.h>
+#include "common.h"
+
+/* persist on disk with compact representation
+    date representation -> value
+ */
+void store_result(U32 val, struct date d);
+void retrieve_result(U32 val, struct date d);
+void retrieve_results_before(int *vals, struct date before);
+

include/window_state.h

@@ -0,0 +1,24 @@
+#ifndef WINDOWSTATE_H
+#define WINDOWSTATE_H
+
+#include "common.h"
+#include <stddef.h>
+#define GRAPH_DAYS 30
+
+enum mode_t {
+  WINDOW = 0,
+  OVERLAY
+};
+typedef enum mode_t Mode;
+
+void init_window_state();
+void cleanup_window_state();
+
+void set_intention(char *intention);
+char *get_intention();
+size_t get_intention_size();
+
+Mode get_mode();
+void set_mode(Mode mode);
+
+#endif