Keys. Did barely anything this evening.

src/main.cpp

@@ -1,5 +1,6 @@
 #include <ti/screen.h>
 #include <ti/getcsc.h>
+#include <ti/getkey.h>
 #include <stdlib.h>
 #include "main.h"
 
@@ -40,6 +41,7 @@ int main(void)
     return 0;
 }
 
+static const char* list_symbols = "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 int display_list(const list_item* list, const list_config& config)
 {
     size_t item_count = 0;
@@ -52,12 +54,32 @@ int display_list(const list_item* list, const list_config& config)
     if (item_count == 0) return -1; // No list to display.
 
     uint8_t max_on_screen = MIN(config.end_row - config.start_row, 10 - config.start_row) + 1;
-    uint24_t offset = 0;
+
+    uint24_t index = 0,
+             offset = 0;
+
+_render:
     for (size_t i = 0, j = offset; i < max_on_screen && j < item_count; i++, j++)
     {
+        // TODO: print prefix
         os_SetCursorPos(config.start_row + i, 0);
         os_PutStrLine(list[j].display_name);
     }
 
+    uint16_t key = os_GetKey();
+    switch (key)
+    {
+        case k_Up:
+            if (index > 0) index--;
+            if (index <= offset) offset = index;
+            break;
+
+        case k_Down:
+            if (index < item_count) index++;
+            if (index >= offset) offset = index;
+            break;
+    }
+    goto _render;
+
     return -1;
 }