Move more main.asm code into individual files

engine/select_menu.asm

@@ -0,0 +1,189 @@
+SelectMenu:: ; 13327
+
+	call CheckRegisteredItem
+	jr c, .NotRegistered
+	jp UseRegisteredItem
+
+.NotRegistered:
+	call OpenText
+	ld b, BANK(ItemMayBeRegisteredText)
+	ld hl, ItemMayBeRegisteredText
+	call MapTextbox
+	call WaitButton
+	jp CloseText
+; 13340
+
+
+ItemMayBeRegisteredText: ; 13340
+	text_jump UnknownText_0x1c1cf3
+	db "@"
+; 13345
+
+
+CheckRegisteredItem: ; 13345
+
+	ld a, [WhichRegisteredItem]
+	and a
+	jr z, .NoRegisteredItem
+	and REGISTERED_POCKET
+	rlca
+	rlca
+	ld hl, .Pockets
+	rst JumpTable
+	ret
+
+.Pockets:
+	dw .CheckItem
+	dw .CheckBall
+	dw .CheckKeyItem
+	dw .CheckTMHM
+
+.CheckItem:
+	ld hl, NumItems
+	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, [RegisteredItem]
+	ld hl, KeyItems
+	ld de, 1
+	call IsInArray
+	jr nc, .NoRegisteredItem
+	ld a, [RegisteredItem]
+	ld [CurItem], a
+	and a
+	ret
+
+.CheckBall:
+	ld hl, NumBalls
+	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 [WhichRegisteredItem], a
+	ld [RegisteredItem], a
+	scf
+	ret
+; 133a6
+
+
+.CheckRegisteredNo: ; 133a6
+	ld a, [WhichRegisteredItem]
+	and REGISTERED_NUMBER
+	dec a
+	cp [hl]
+	jr nc, .NotEnoughItems
+	ld [CurItemQuantity], a
+	and a
+	ret
+
+.NotEnoughItems:
+	scf
+	ret
+; 133b6
+
+
+.IsSameItem: ; 133b6
+	ld a, [RegisteredItem]
+	cp [hl]
+	jr nz, .NotSameItem
+	ld [CurItem], a
+	and a
+	ret
+
+.NotSameItem:
+	scf
+	ret
+; 133c3
+
+
+UseRegisteredItem: ; 133c3
+
+	callba CheckItemMenu
+	ld a, [wItemAttributeParamBuffer]
+	ld hl, .SwitchTo
+	rst JumpTable
+	ret
+
+.SwitchTo:
+	dw .CantUse
+	dw .NoFunction
+	dw .NoFunction
+	dw .NoFunction
+	dw .Current
+	dw .Party
+	dw .Overworld
+; 133df
+
+.NoFunction: ; 133df
+	call OpenText
+	call CantUseItem
+	call CloseText
+	and a
+	ret
+; 133ea
+
+.Current: ; 133ea
+	call OpenText
+	call DoItemEffect
+	call CloseText
+	and a
+	ret
+; 133f5
+
+.Party: ; 133f5
+	call RefreshScreen
+	call FadeToMenu
+	call DoItemEffect
+	call CloseSubmenu
+	call CloseText
+	and a
+	ret
+; 13406
+
+.Overworld: ; 13406
+	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
+	ld [hMenuReturn], a
+	ret
+; 13422
+
+.CantUse: ; 13422
+	call RefreshScreen
+
+._cantuse
+	call CantUseItem
+	call CloseText
+	and a
+	ret
+; 1342d