imageshrink

#!/usr/bin/env bash
#
# imageshrink
#
# Shrink the specified image(s)
#
# Author: Emanuel Duss
#

set -o errexit
set -o nounset
set -o pipefail

print_help(){
cat << EOI
Usage: imageshrink [files ...]

EOI
}

check_dependencies(){
  FAIL=0
  for tool in $@
  do
    if ! hash "$tool" &> /dev/null
    then
      echo "The tool $tool does not exist."
      FAIL=1
    fi
  done
  if [[ "$FAIL" == 1 ]]
  then
    exit 1
  fi
}

main(){
  check_dependencies convert

  FOLDER="small"
  QUALITY="75"
  SIZE="1280x1280"
  SIZE="2048x2048"

  if [[ ! -d "$FOLDER" ]]
  then
    mkdir "$FOLDER"
  fi

  TOTAL="$(echo $@ | wc -w)"
  COUNT=0
  for photo in $@
  do
    COUNT=$((COUNT + 1))
    echo -ne "\r\033[KProcessing $photo: $COUNT/$TOTAL ($(( 100 * $COUNT / $TOTAL))%)"
    destination="$FOLDER/$photo"
    if [[ ! -f "$destination" && -f "$photo" && ! -d "$photo" ]]
    then
      if ! convert -resize "$SIZE" -quality "$QUALITY" "$photo" "$destination"
      then
        echo "Error while processing $photo."
      fi
    fi
  done
  echo
}

trap "echo; exit 1" SIGINT SIGTERM

main "$@"