Is this a purpose clause? Catullus 15

commendo tibi me ac meos amores,
Aureli. ueniam peto pudentem,
ut, si quicquam animo tuo cupisti,
quod castum expeteres et integellum,
conserues puerum mihi pudice,
non dico a populo—nihil ueremur
istos, qui in platea modo huc modo illuc
in re praetereunt sua occupati,—
uerum a te metuo tuoque pene
10 infesto pueris bonis malisque.

I think the line in bold is a purpose clause - ‘that, if in your heart, you have ever longed for something to seek out, pure and unspoiled…’ - but I’m not 100% sure. Any thoughts would be appreciated!

I don’t think purpose, but a relative clause of characteristic explaining quicquam.

Ah, I see - so ‘which you might seek out’ is probably a better translation?

I’m also having trouble with the phrase ‘ubi erit foris paratum’ and can only render it very literally ‘when it will be ready outside’ (although I am really not sure what the sense is here)

edit: I have just read Ellis’ commentary which says “Quod expeteres, i.e. ut id exp. Epexegetic.” so I think it might in fact be a purpose clause

No. epexegetic(al) means “explanatory,” so it is certainly not expressing purpose.