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add pemu: plumb script for emulator roms

--- a/bin/nesj

+++ /dev/null

@@ -1,20 +1,0 @@

-#!/bin/rc

-

-n=`{sed -n '/ep.\.0/h;${g;s/^(ep.\.0).*/\1/p;}' /dev/usb/ctl}

-while(~ $1 -?){

-	switch($1){

-	case -k	# just make /sys/src/9/boot/nusbrc do nothing if it sees your

-		# device instead

-		p=`{ps | sed -n '/ kb$/h;${g;s/^[^ ]+ +([0-9]+) .*/\1/p;}'}

-		echo kill >/proc/$p/note

-		wait $p

-	case -n

-		n=ep$2.0

-		shift

-	}

-	shift

-}

-

-echo resize -dx 776 -dy 728 >/dev/wctl

-nusb/joy /dev/usb/$n | joynes 1 | games/nes -a3 $*

-# press Kdel again to kill nusb/joy...

--- /dev/null

+++ b/bin/pemu

@@ -1,0 +1,28 @@

+#!/bin/rc

+rfork n

+if(~ $#* 0){

+	echo usage: $0 '[-j ep]' rom.ext >[1=2]

+	exit usage

+}

+if(~ $1 -j){

+	j=$1

+	shift

+}

+if not

+	j=`{sed -n '/ep.\.0/h;${g;s/^ep(.)\.0.*/\1/p;}' /dev/usb/ctl}

+ext=`{echo $1 | sed 's/.*\.([^\.]+)$/\1/'}

+switch($ext){

+case 2600 gb gbc gba md nes snes

+	e=$ext

+case smc

+	e=snes

+case bin

+	if(~ `{file $1} *SEGA*)

+		e=md

+	if not

+		e=2600

+case *

+	echo unknown rom type >[1=2]

+	exit usage

+}

+exec $e -j $j $1