Bash script to compile and assemble an NES ROM using loopy's asm6 and create files appropriate for burning to chips

makeNES

#!/bin/bash
#===============================================================================
#
#          FILE:  makeNES
#
#         USAGE:  ./makeNES [options] [ASM [CHR [NES]]]
#
#   DESCRIPTION:  Bash script to compile and assemble an NES ROM using loopy's
#                 asm6 and create files appropriate for burning to chips
#
#       OPTIONS:  ---
#  REQUIREMENTS:  asm6 ( http://home.comcast.net/~olimar/NES/ )
#          BUGS:  ---
#         NOTES:  ---
#        AUTHOR:  Timothy Caraballo, openback@gmail.com
#       COMPANY:  Pixelpod International, Inc.
#       VERSION:  1.00
#       CREATED:  2010-08-15 11:30:00 AM EST
#===============================================================================

#===============================================================================
# Script variables
#===============================================================================
NOCLOBBER=0
BOLD=`tput bold`
BOLDOFF=`tput sgr0`
PADCHR=0
CREATEDPADDEDCHR=0
PADPRG=0
NESONLY=0

#===============================================================================
# Prints usage info
#===============================================================================
function USAGE () {
echo "\
${BOLD}USAGE${BOLDOFF}:
    `basename $0` [options] [ASM [CHR [NES]]]

Bash script to compile and assemble an NES ROM using loopy's asm6 and
create files appropriate for burning to chips.

${BOLD}OPTIONS${BOLDOFF}
    ${BOLD}-c n${BOLDOFF}   Pads the CHR file to the specified number of KB
    ${BOLD}-e${BOLDOFF}     Create NES file only
    ${BOLD}-n${BOLDOFF}     Do not clobber files
    ${BOLD}-p n${BOLDOFF}   Pads the PRG file to the specified number of KB
    ${BOLD}-v${BOLDOFF}     Version information
    ${BOLD}-h${BOLDOFF}     This usage information

${BOLD}NOTES${BOLDOFF}
    If the ASM or CHR files are not specified, the first .asm or .chm
    found will be used.

${BOLD}REQUIREMENTS${BOLDOFF}
    asm6 ( http://home.comcast.net/~olimar/NES/ )
"
[[ $# ]] && exit $1
}

#===============================================================================
# Main routine
#===============================================================================
# Set our option variables
while getopts ":c:ehnp:v?" opt
do
    case $opt in
        c)
            PADCHR=$OPTARG
            ;;
        e)
            NESONLY=1
            ;;
        h)
            USAGE 0
            ;;
        n)
            NOCLOBBER=1
            ;;
        p)
            PADPRG=$OPTARG
            ;;
        v)
            echo "`basename $0` 1.00 (2011-08-15)"
            exit 0
            ;;
        :)
            echo "Option -$OPTARG requires an argument." >&2
            echo "Try \``basename $0` -h' for more information." >&2
            exit 1
            ;;
        ?)
            echo ""
            echo "Invalid option: -$OPTARG" >&2
            USAGE 1
            ;;
    esac
done
shift $(($OPTIND - 1))

# Grab the default filenames first
ASM=`ls -1 *.asm 2>/dev/null|head -1`
CHR=`ls -1 *.chr 2>/dev/null|head -1`
X=${ASM%.asm}
NES=${X##*/}.nes

# Grab ones from the command line if given
(( $# )) && ASM=$1
shift
(( $# )) && CHR=$1
shift
(( $# )) && NES=$1

[ -z "$ASM" ] && { echo "Error: No ASM was found" >&2; exit 1; }
[ -z "$CHR" ] && { echo "Error: No CHR was found" >&2; exit 1; }
[ -f "$ASM" ] || { echo "Error: The ASM, $ASM, was not found" >&2; exit 1; }
[ -f "$CHR" ] || { echo "Error: The CHR, $CHR, was not found" >&2; exit 1; }
[ -f "$NES" -a $NOCLOBBER -ne 0 ] && { echo "Error: $NES already exists."; exit 1; }

X=${CHR%.chr}
PADDEDCHR=${X##*/}.padded.chr

echo "Compiling $ASM"

asm6 "$ASM" prg.tmp.bin || exit 1

if (( $PADPRG )); then
    echo "Padding the PRG"
    # Make a blank file of the right size
    dd if=/dev/zero of=prg.padded.bin bs=16 count=$(( ($PADPRG * 64) + 1 )) 2> /dev/null

    if [[ `ls -S1 prg.padded.bin prg.tmp.bin|head -1` == "prg.tmp.bin" ]]; then
        echo "Error: Padded PRG file is smaller than the original" >&2
        rm prg.tmp.bin prg.padded.bin 2>/dev/null
        exit 1
    fi

    # Copy the compiled PRG into that file
    dd if=prg.tmp.bin of=prg.padded.bin bs=16 conv=notrunc 2> /dev/null
    mv prg.padded.bin prg.tmp.bin || exit 1
fi

if (( $PADCHR )); then
    echo "Padding the CHR"
    dd if=/dev/zero of="$PADDEDCHR" bs=1024 count=$PADCHR 2> /dev/null

    if [[ `ls -S1 "$PADDEDCHR" "$CHR"|head -1` == $CHR ]]; then
        echo "Error: The Padded CHR file is smaller than the original" >&2
        rm "$PADDEDCHR"
        rm prg.tmp.bin prg.padded.bin 2>/dev/null
        exit 1
    fi

    dd if="$CHR" of="$PADDEDCHR" conv=notrunc 2> /dev/null
    CHR=$PADDEDCHR
    CREATEDPADDEDCHR=1
fi

echo "Creating $NES"
cat prg.tmp.bin "$CHR" >"$NES"

if (( $NESONLY )); then
    rm prg.bin 2>/dev/null
    (( $CREATEDPADDEDCHR )) && rm $PADDEDCHR 2>/dev/null
else
    # Remove the header from the PRG for burning
    dd status=noxfer if=prg.tmp.bin of=prg.bin bs=16 skip=1 2>/dev/null || exit 1
fi

rm prg.tmp.bin
(( $? )) || echo "Done."