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add emu: common code for all emulator launchers

--- /dev/null

+++ b/bin/emu

@@ -1,0 +1,23 @@

+#!/bin/rc -e

+rfork n

+if(~ $*(3) ''){

+	echo $0 '[-j usbep] emu width height [params] rom'

+	exit usage

+}

+emu=$1

+rescale $2 $3

+shift 3

+joy=()

+if(~ $1 -j){

+	joy=$2

+	shift 2

+}

+if(test -d /sys/games/lib/rom/$emu){

+	mkdir -p $home/lib/$emu

+	bind -bc $home/lib/$emu /sys/games/lib/rom/$emu

+	cd /sys/games/lib/rom/$emu

+}

+if(~ $#joy 1)

+	nusb/joy /dev/usb/ep^$joy^.0 | joy | {eval games/$emu -a $* || eval games/$emu $*}

+if not

+	eval games/$emu -a $* || eval games/$emu $*