merger.sh

#!/bin/bash

# an array for the arguments
declare -a args
declare -a audio
declare -a subs
declare -a fonts

# color codes
sh_b="\e[1;34m" # blue, welcome text
sh_g="\e[1;32m" # green, success text
sh_c="\e[1;36m" # cyan, info text
sh_r="\e[0m" # reset color

echo -e "${sh_b} Loading merge script generator ${sh_r}"

# loop over all MP4 files
echo -e "${sh_c} INFO ${sh_r} Looking for all mkv files present in the root folder"
for mkv in *.{mkv,MKV} ; do
  if [ -e "${mkv}" ]; then
    base="${mkv%mkv}"
    args=(--default-language en -o "output/${base}mkv" "${mkv}")
    subs=()
    audio=()
    fonts=()

    # look for subtitles with the same base name
    echo -e "${sh_c} INFO ${sh_r} Looking for subtitles with the same base name"
    for subsFile in *.{ass,ASS,srt,SRT,mks,MKS} ; do
      subsFileBase=$(grep -F "${base}" <<<"$subsFile")

      if [ -e "${subsFileBase}" ]; then
        subs=("${subs[@]}" "${subsFileBase}")
        break
      fi
    done

    # look for audio with the same base name
    echo -e "${sh_c} INFO ${sh_r} Looking for audio with the same base name"
    for audioFile in *.{mka,MKA} ; do
      audFileBase=$(grep -F "${base}" <<<"$audioFile")

      if [ -e "${audFileBase}" ]; then
        audio=("${subs[@]}" "${audFileBase}")
        break
      fi
    done
    
    # look for eng folder
    echo -e "${sh_c} INFO ${sh_r} Checking if 'eng' folder is present"
    if [[ -d "eng" ]]; then
      echo -e "${sh_c} INFO ${sh_r} 'eng' folder is present"

      # look for eng audio with same base name
      echo -e "${sh_c} INFO ${sh_r} Looking for audio with the same base name"
      for engfile in eng/*.{mka,MKA} ; do
        engFileBase=$(grep -F "${base}" <<<"$engfile")

        if [ -e "${engFileBase}" ]; then
          audio=("${audio[@]}" "${engFileBase}")
          break
        fi
      done

      # look for eng subtitles with same base name
      echo -e "${sh_c} INFO ${sh_r} Looking for other subtitles with the same base name in 'eng' folder"
      for engfile in eng/*.{ass,ASS} ; do
        engFileBase=$(grep -F "${base}" <<<"$engfile")

        if [ -e "${engFileBase}" ]; then
          subs=("${subs[@]}" "${engFileBase}")
          break
        fi
      done
    fi
    
    # look for fonts folder
    echo -e "${sh_c} INFO ${sh_r} Looking for 'fonts' folder"
    if [[ -d "fonts" ]]; then
      for font in fonts/*.{ttf,TTF} ; do
      if [ -e "${font}" ]; then
        fonts=("${fonts[@]}" --attachment-mime-type application/x-truetype-font --attach-file "${font}")
      fi
      done

      for font in fonts/*.{otf,OTF} ; do
      if [ -e "${font}" ]; then
        fonts=("${fonts[@]}" --attachment-mime-type application/vnd.ms-opentype --attach-file "${font}")
      fi
      done
    fi

    args=("${args[@]}" "${audio[@]}" "${subs[@]}" "${fonts[@]}")

    # create output file
    echo -e "${sh_c} INFO ${sh_r} Generating output file for ${base}"
    mkvmerge "${args[@]}" | (sed -n /^The/q;cat)
    # mkvmerge "${args[@]}" | (sed -n /^The/q;cat) | (sed 2d;cat)
  fi
done

echo -e "${sh_g} SUCCESS ${sh_r} Finished creating output files"
read -p "Press any key to continue... " -n1 -s