random scripts I use
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#!/usr/bin/env fish
function ds-patch -d 'Patches a Nintendo DS game' -a zip xp
set out (basename "$zip" .zip).nds
set tmp (mktemp -d)
unzip "$zip" -d "$tmp"
xdelta3 -d -s "$tmp/"*.nds "$xp" "$tmp/patched.nds"
ndstrim "$tmp/patched.nds" "$out"
rm -rf "$tmp"
end
## EOF