decent script to make android icons from PDF files, supports transparency

icons.sh

#!/bin/sh

usage ()
{
  echo "Usage:\nsh icons.sh standard_icon.pdf debug_icon.pdf"
  exit 1
}

# usage: iconize input/file.pdf some/output/path/file.png 256
# where `256` is the size to generate
iconize ()
{
  if [ -e "$1" ]
  then
    convert -density 400 $1 -scale $3x$3 $2
  else
    echo "(iconize) File not found: $1"
  fi
}

# usage: single_icon hdpi input_icon.pdf path/to/res 98
single_icon ()
{
    iconize $2 $3/mipmap-$1/ic_launcher.png $4
    echo "Created $3/mipmap-$1/ic_launcher.png"
    mogrify -strip $3/mipmap-$1/ic_launcher.png
}

# usage: android_icons input_icon.pdf path/to/res
android_icons ()
{
    single_icon ldpi $1 $2 36
    single_icon mdpi $1 $2 48
    single_icon hdpi $1 $2 72
    single_icon xhdpi $1 $2 96
    single_icon xxhdpi $1 $2 144
    single_icon xxxhdpi $1 $2 192
}

# abort if there are not exactly two arguments
if [ "$#" -ne 2 ]
then
  usage
fi

# abort if first file is not found
if [ ! -e "$1" ]
then
  usage
fi

# abort if second file is not found
if [ ! -e "$2" ]
then
  usage
fi

echo "Generating standard icons from $1"
gs -dQUIET -dNOPAUSE -sDEVICE=pngalpha -o temp.png -sDEVICE=pngalpha -r288 $1
android_icons temp.png app/src/main/res

echo "Generating debug icons from $2"
gs -dQUIET -dNOPAUSE -sDEVICE=pngalpha -o temp.png -sDEVICE=pngalpha -r288 $2
android_icons temp.png app/src/debug/res

rm temp.png

echo "Done."