asset size comparison

sizecheck.sh

#!/bin/bash

ARGC=$#

# if no directory specified, use current
if [ $ARGC -eq 0 ]
then
  BASEDIR=${PWD}
else
  BASEDIR=${1}
fi

cd ${BASEDIR}

# list one file per line excluding those that contains '@2x' in the filename
# use the output to feed the 'while' loop
 
ls -1 | grep -v \@2x | while read FILENAME
do
  BASENAME="${FILENAME%.*}"
  EXT="${FILENAME##*.}"
  FILENAME2X="${BASENAME}@2x.${EXT}"
  # if no corresponding @2x file exists, skip it
  if [ ! -f "${FILENAME2X}" ]
  then
    continue
  fi
  # get the dimensions for both 1x and 2x images
  W1=`sips -g pixelWidth "${FILENAME}" | grep pixelWidth | awk '{ print $2 }'`
  H1=`sips -g pixelHeight "${FILENAME}" | grep pixelHeight | awk '{ print $2 }'`
  W2=`sips -g pixelWidth "${FILENAME2X}" | grep pixelWidth | awk '{ print $2 }'`
  H2=`sips -g pixelHeight "${FILENAME2X}" | grep pixelHeight | awk '{ print $2 }'`
  
  # calculate double the sizes of 1x
  DW1=`expr ${W1} \* 2`
  DH1=`expr ${H1} \* 2`

  # check for inequality between the calculated values and the actual 2x image sizes
  if [ ${DW1} -ne ${W2} -o ${DH1} -ne ${H2} ]
  then
    echo "${FILENAME} / ${FILENAME2X}"
    if [ ${DW1} -ne ${W2} ]
    then
      echo "width: ${W1}/${W2}"
    fi
    if [ ${DH1} -ne ${H2} ]
    then
      echo "height: ${H1}/${H2}"
    fi
    echo 
  fi

done