Batch resize and convert images with retina-support

resize-and-convert.sh

#!/bin/bash

if ! brew ls --versions imagemagick > /dev/null; then
  # The package is not installed
  echo "Installing imagemagick…"
  brew install imagemagick
fi

echo "Resizing to @2x…"
mogrify -path . -resize "160x30>" ../originals/*.png

ORIGINALS=`find . -name "*.png" \! -name "*@2x.png"`
for original_filename in $ORIGINALS
do
  retina_filename="${original_filename%.png}@2x.png"
  mv $original_filename $retina_filename
done

echo "Resizing to @1x…"
mogrify -path . -resize "80x15>" ../originals/*.png

echo "Optimizing…"
imageOptim --image-alpha --skip-if-larger --quit --verbose --directory .

echo "Done"