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#!/bin/bash
BINMERGE converter v1.00
Copyright (c) 2020 by Akuma under GNU General Public License 2.0

set -eo pipefail
OLDIFS=$IFS;IFS=$'\t\n'
trap "result" 0 1 2 3 15

result(){
  case $? in
      0) echo -e "\nSuccess";;
    100) echo -e "usage: ${0##*/} /path/to/cue-file";;
    101) echo "error: '$file' file not found";;
  esac
  echo
  IFS=$OLDIFS
}

to_time(){\
 printf "%02d:%02d:%02d" $(((10#$1/75)/60)) $(((10#$1/75)%60)) $((10#$1%75));}

to_frames(){ set ${1//:/ }; echo $(((60*10#$1+10#$2)*75+10#$3));}

getcuemode(){ grep -Po 'MODE./[0-9]{4}' "$1";}

getfilesize(){ stat -c%s "$1";}

mergecue(){ #cue-file
  local cue="$1" line framesize filesize frames=0 print
  echo "FILE \"merged.bin\" BINARY"
  cat "$cue"|while read line;do
    IFS=$' \t\r\n';set $line
    case "$1" in
        FILE) IFS='"';set $line
              framesize="$(getcuemode "$cue")";framesize="${framesize##*/}"
              filesize=$(getfilesize "$2")
              print=$frames
              frames=$((frames+(filesize/framesize)))
              continue
              ;;
       INDEX) print=$((print+$(to_frames $3)));;
      PREGAP) print=$((print+$(to_frames $2)));;
    esac
    echo "${line/??:??:??/$(to_time $print)}"
  done
  IFS=$'\t\r\n'
}

mergebin(){ grep -Po '".*"' "$1"|while read file;do echo "${1%/*}/$file"; done|xargs cat;}

checkfile(){ file="$1";[[ -f "$1" ]] || exit 101;}

[[ -f "$1" ]] || exit 100

cue="$(readlink -f $1)"; checkfile "$cue"

mergecue "$cue" > merged.cue
mergebin "$cue" > merged.bin

IFS=$OLDIFS

exit 0