sanitize.sh

#!/bin/bash

declare -A fileinfo

# Resets the fileinfo map
fileinfo_reset() {
  fileinfo[year]="0000"
  fileinfo[month]="00"
  fileinfo[day]="00"
  fileinfo[hour]="00"
  fileinfo[minute]="00"
  fileinfo[second]="00"
  fileinfo[sequence]=""
  fileinfo[extension]="invalid"
  fileinfo[format]="invalid"
}

# Populates the fileinfo map with the attributes parsed from the filename
# Returns 1 if it can't process the file
fileinfo_match() {
  # Capture groups
  #            1                                                                            2         3           4         5           6         7                  8         9               10        11              12        13                               17        18
  if [[ $1 =~ ^(Screenshot\ from\ |Bildschirmfoto\ am\ |Screenshot_|IMG_|JPEG_|MVIMG_|VID_)?([0-9]{4})(_|-|\ |\.)?([0-9]{2})(_|-|\ |\.)?([0-9]{2})(_|-|\ |\.|\ um\ )?([0-9]{2})(%3a|:|\.|-|\ )?([0-9]{2})(%3a|:|\.|-|\ )?([0-9]{2})((_|\.)?[0-9]{3})?((-|~|_|\.|\ \()(.+)\)?)*.(png|jpg|jpeg|mp4)$ ]]; then
    fileinfo[year]="${BASH_REMATCH[2]}"
    fileinfo[month]="${BASH_REMATCH[4]}"
    fileinfo[day]="${BASH_REMATCH[6]}"
    fileinfo[hour]="${BASH_REMATCH[8]}"
    fileinfo[minute]="${BASH_REMATCH[10]}"
    fileinfo[second]="${BASH_REMATCH[12]}"
    fileinfo[sequence]="${BASH_REMATCH[17]}"
    fileinfo[extension]="${BASH_REMATCH[18]}"
    fileinfo[format]="${BASH_REMATCH[1]}1970${BASH_REMATCH[3]}01${BASH_REMATCH[5]}01${BASH_REMATCH[7]}00${BASH_REMATCH[9]}00${BASH_REMATCH[11]}00.${extension}"
    return 0
  # Capture groups
  #              1                                                       2        3
  elif [[ $1 =~ ^(Screenshot\ from\ |Screenshot_|IMG_|JPEG_|MVIMG_|VID_)?([0-9]+).(png|jpg|jpeg|mp4)$ ]]; then
    fileinfo[year]="$(date -d @${BASH_REMATCH[2]} +%Y)"
    fileinfo[month]="$(date -d @${BASH_REMATCH[2]} +%m)"
    fileinfo[day]="$(date -d @${BASH_REMATCH[2]} +%d)"
    fileinfo[hour]="$(date -d @${BASH_REMATCH[2]} +%H)"
    fileinfo[minute]="$(date -d @${BASH_REMATCH[2]} +%M)"
    fileinfo[second]="$(date -d @${BASH_REMATCH[2]} +%S)"
    fileinfo[extension]="${BASH_REMATCH[3]}"
    fileinfo[format]="${BASH_REMATCH[1]}1562852834.${extension}"
    return 0
  else
    return 1
  fi
}

# Builds the new filename from the fileinfo map
fileinfo_name() {
  if [ "${fileinfo[sequence]}" != "" ]; then
    echo "${fileinfo[year]}${fileinfo[month]}${fileinfo[day]}_${fileinfo[hour]}${fileinfo[minute]}${fileinfo[second]}-${fileinfo[sequence]}.${fileinfo[extension]}"
  else
    echo "${fileinfo[year]}${fileinfo[month]}${fileinfo[day]}_${fileinfo[hour]}${fileinfo[minute]}${fileinfo[second]}.${fileinfo[extension]}"
  fi
}

# Parsing parameters
POSITIONAL=()
while [[ $# -gt 0 ]]
do
key="$1"

case $key in
    -a|--apply)
    apply=1
    shift # past argument
    ;;
    -d|--debug)
    debug=1
    shift # past argument
    ;;
    *)    # unknown option
    POSITIONAL+=("$1") # save it in an array for later
    shift # past argument
    ;;
esac
done
set -- "${POSITIONAL[@]}" # restore positional parameters

# Printing header for simulated run
if [ ! $apply ]; then
  echo "Proposed Changes:"
fi

# Use positional parameters as targets, otherwise current folder
if [ ${#POSITIONAL[@]} -eq 0 ]; then
  targets=($PWD)
else
  targets=$POSITIONAL
fi

# Processing files
find "${targets[@]}" -maxdepth 1 -type f -name "*.png" -o -name "*.jpg" -o -name "*.jpeg" -o -name "*.mp4" | while read filename
do
  fileinfo_reset
  
  valid=0
  
  old=$(basename "${filename}")
  directory=$(dirname "${filename}")
  
  if fileinfo_match "$old"; then
    valid=1
  else
    echo "  Invalid format: ${filename}"
  fi
  
  if [ $debug ]; then
    for key in "${!fileinfo[@]}"; do
      echo -n "${key}=${fileinfo[${key}]}, "
    done
    echo
  fi
  
  # Only process files if we can find a valid format
  if (($valid)); then
    new=$(fileinfo_name)
    # Only process files with changed names
    if [ "$new" != "$old" ]; then
      if [ $apply ]; then
        mv "${directory}/${old}" "${directory}/${new}"
      else
        echo "  mv ${directory}/${old}" "${directory}/${new}"
      fi
    fi
  fi
done

# Printing footer for simulated run
if [ ! $apply ]; then
  echo "Use ./sanitize.sh --apply to apply the changes"
fi