1 files changed, 172 insertions, 0 deletions
diff --git a/engine/overworld/select_menu.asm b/engine/overworld/select_menu.asm
new file mode 100644
index 00000000..18532eda
--- /dev/null
+++ b/engine/overworld/select_menu.asm
@@ -0,0 +1,172 @@
+SelectMenu::
+	call CheckRegisteredItem
+	jr c, .NotRegistered
+	jp UseRegisteredItem
+
+.NotRegistered:
+	call OpenText
+	ld b, BANK(MayRegisterItemText)
+	ld hl, MayRegisterItemText
+	call MapTextbox
+	call WaitButton
+	jp CloseText
+
+MayRegisterItemText:
+	text_far _MayRegisterItemText
+	text_end
+
+CheckRegisteredItem:
+	ld a, [wWhichRegisteredItem]
+	and a
+	jr z, .NoRegisteredItem
+	and REGISTERED_POCKET
+	rlca
+	rlca
+	ld hl, .Pockets
+	rst JumpTable
+	ret
+
+.Pockets:
+; entries correspond to *_POCKET constants
+	dw .CheckItem
+	dw .CheckBall
+	dw .CheckKeyItem
+	dw .CheckTMHM
+
+.CheckItem:
+	ld hl, wNumItems
+	call .CheckRegisteredNo
+	jr c, .NoRegisteredItem
+	inc hl
+	ld e, a
+	ld d, 0
+	add hl, de
+	add hl, de
+	call .IsSameItem
+	jr c, .NoRegisteredItem
+	and a
+	ret
+
+.CheckKeyItem:
+	ld a, [wRegisteredItem]
+	ld hl, wKeyItems
+	ld de, 1
+	call IsInArray
+	jr nc, .NoRegisteredItem
+	ld a, [wRegisteredItem]
+	ld [wCurItem], a
+	and a
+	ret
+
+.CheckBall:
+	ld hl, wNumBalls
+	call .CheckRegisteredNo
+	jr nc, .NoRegisteredItem
+	inc hl
+	ld e, a
+	ld d, 0
+	add hl, de
+	add hl, de
+	call .IsSameItem
+	jr c, .NoRegisteredItem
+	ret
+
+.CheckTMHM:
+	jr .NoRegisteredItem
+
+.NoRegisteredItem:
+	xor a
+	ld [wWhichRegisteredItem], a
+	ld [wRegisteredItem], a
+	scf
+	ret
+
+.CheckRegisteredNo:
+	ld a, [wWhichRegisteredItem]
+	and REGISTERED_NUMBER
+	dec a
+	cp [hl]
+	jr nc, .NotEnoughItems
+	ld [wCurItemQuantity], a
+	and a
+	ret
+
+.NotEnoughItems:
+	scf
+	ret
+
+.IsSameItem:
+	ld a, [wRegisteredItem]
+	cp [hl]
+	jr nz, .NotSameItem
+	ld [wCurItem], a
+	and a
+	ret
+
+.NotSameItem:
+	scf
+	ret
+
+UseRegisteredItem:
+	farcall CheckItemMenu
+	ld a, [wItemAttributeParamBuffer]
+	ld hl, .SwitchTo
+	rst JumpTable
+	ret
+
+.SwitchTo:
+; entries correspond to ITEMMENU_* constants
+	dw .CantUse
+	dw .NoFunction
+	dw .NoFunction
+	dw .NoFunction
+	dw .Current
+	dw .Party
+	dw .Overworld
+
+.NoFunction:
+	call OpenText
+	call CantUseItem
+	call CloseText
+	and a
+	ret
+
+.Current:
+	call OpenText
+	call DoItemEffect
+	call CloseText
+	and a
+	ret
+
+.Party:
+	call RefreshScreen
+	call FadeToMenu
+	call DoItemEffect
+	call CloseSubmenu
+	call CloseText
+	and a
+	ret
+
+.Overworld:
+	call RefreshScreen
+	ld a, 1
+	ld [wUsingItemWithSelect], a
+	call DoItemEffect
+	xor a
+	ld [wUsingItemWithSelect], a
+	ld a, [wItemEffectSucceeded]
+	cp 1
+	jr nz, ._cantuse
+	scf
+	ld a, HMENURETURN_SCRIPT
+	ldh [hMenuReturn], a
+	ret
+
+.CantUse:
+	call RefreshScreen
+
+._cantuse
+	call CantUseItem
+	call CloseText
+	and a
+	ret