clean_rom_media.sh

#!/bin/bash

# Set the ROM folder
BASE="/home/pi/RetroPie/roms"

# List the platforms to scan
PLATFORMS=(arcade snes nes megadrive)
EXTS=(.zip .sfc .7z .md)

MAKE_DIFFS=1
DELETE=0

for ((i=0;i<${#PLATFORMS[@]};++i)); do
  if [ $MAKE_DIFFS = 1 ]; then
    find $BASE/${PLATFORMS[i]} -type f -name "*${EXTS[i]}" -exec basename {} ${EXTS[i]} \; | sort > roms-${PLATFORMS[i]}.txt
    find $BASE/${PLATFORMS[i]}/media/videos -type f -name "*.mp4" -exec basename {} .mp4 \; | sort > video-${PLATFORMS[i]}.txt
    find $BASE/${PLATFORMS[i]}/media/marquees -type f -name "*.png" -exec basename {} .png \; | sort > marquee-${PLATFORMS[i]}.txt
    find $BASE/${PLATFORMS[i]}/media/screenshots -type f -name "*.png" -exec basename {} .png \; | sort > screenshot-${PLATFORMS[i]}.txt

    comm -13 roms-${PLATFORMS[i]}.txt video-${PLATFORMS[i]}.txt > video-${PLATFORMS[i]}.diff
    comm -13 roms-${PLATFORMS[i]}.txt marquee-${PLATFORMS[i]}.txt > marquee-${PLATFORMS[i]}.diff
    comm -13 roms-${PLATFORMS[i]}.txt screenshot-${PLATFORMS[i]}.txt > screenshot-${PLATFORMS[i]}.diff
  fi

  if [ $DELETE = 1 ]; then
    while read p; do
      rm "$BASE/${PLATFORMS[i]}/media/videos/$p.mp4"
    done <video-${PLATFORMS[i]}.diff

    while read p; do
      rm "$BASE/${PLATFORMS[i]}/media/marquees/$p.png"
    done <marquee-${PLATFORMS[i]}.diff

    while read p; do
      rm "$BASE/${PLATFORMS[i]}/media/screenshots/$p.png"
    done <screenshot-${PLATFORMS[i]}.diff
  fi
done