Revert "Remove CIRCUITPY_8_9_WARNINGS and its usage."

This reverts commit 4bcc424.

Author: eightycc

py/circuitpy_mpconfig.h

@@ -17,6 +17,12 @@
 // Always 1: defined in circuitpy_mpconfig.mk
 // #define CIRCUITPY (1)
 
+// Can be removed once CircuitPython 10 is released.
+// Print warnings or not about deprecated names. See objmodule.c.
+#ifndef CIRCUITPY_8_9_WARNINGS
+#define CIRCUITPY_8_9_WARNINGS (0)
+#endif
+
 // REPR_C encodes qstrs, 31-bit ints, and 30-bit floats in a single 32-bit word.
 #ifndef MICROPY_OBJ_REPR
 #define MICROPY_OBJ_REPR            (MICROPY_OBJ_REPR_C)

py/objmodule.c

@@ -67,6 +67,33 @@ static void module_attr_try_delegation(mp_obj_t self_in, qstr attr, mp_obj_t *de
 static void module_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
     mp_obj_module_t *self = MP_OBJ_TO_PTR(self_in);
     if (dest[0] == MP_OBJ_NULL) {
+        // CIRCUITPY-CHANGE
+        #if CIRCUITPY_8_9_WARNINGS && CIRCUITPY_DISPLAYIO && CIRCUITPY_WARNINGS
+        if (self == &displayio_module) {
+            #if CIRCUITPY_BUSDISPLAY
+            if (attr == MP_QSTR_Display) {
+                warnings_warn(&mp_type_FutureWarning, MP_ERROR_TEXT("%q moved from %q to %q"), MP_QSTR_Display, MP_QSTR_displayio, MP_QSTR_busdisplay);
+                warnings_warn(&mp_type_FutureWarning, MP_ERROR_TEXT("%q renamed %q"), MP_QSTR_Display, MP_QSTR_BusDisplay);
+            }
+            #endif
+            #if CIRCUITPY_EPAPERDISPLAY
+            if (attr == MP_QSTR_EPaperDisplay) {
+                warnings_warn(&mp_type_FutureWarning, MP_ERROR_TEXT("%q moved from %q to %q"), MP_QSTR_EPaperDisplay, MP_QSTR_displayio, MP_QSTR_epaperdisplay);
+            }
+            #endif
+            #if CIRCUITPY_FOURWIRE
+            if (attr == MP_QSTR_FourWire) {
+                warnings_warn(&mp_type_FutureWarning, MP_ERROR_TEXT("%q moved from %q to %q"), MP_QSTR_FourWire, MP_QSTR_displayio, MP_QSTR_fourwire);
+            }
+            #endif
+            #if CIRCUITPY_I2CDISPLAYBUS
+            if (attr == MP_QSTR_I2CDisplay) {
+                warnings_warn(&mp_type_FutureWarning, MP_ERROR_TEXT("%q moved from %q to %q"), MP_QSTR_I2CDisplay, MP_QSTR_displayio, MP_QSTR_i2cdisplaybus);
+                warnings_warn(&mp_type_FutureWarning, MP_ERROR_TEXT("%q renamed %q"), MP_QSTR_I2CDisplay, MP_QSTR_I2CDisplayBus);
+            }
+            #endif
+        }
+        #endif
         // load attribute
         mp_map_elem_t *elem = mp_map_lookup(&self->globals->map, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP);
         if (elem != NULL) {