#!/usr/bin/env bash

# requires imagemagick and png2icns (usually found in libicns)

convert \
  -density 300 \
  -define icon:auto-resize=256,128,96,64,48,32,16 \
  -background none \
  logo.svg logo.ico


# see: https://gist.github.com/plroebuck/af19a26c908838c7f9e363c571199deb

icnsfilename="logo"
iconsetdirname=$(mktemp -d -t logo-XXXXXXXXXX)
sizes=( 16 32 128 256 512 )
#densities=( 72 144 )
densities=( 72 )

for size in "${sizes[@]}"
do
    dimen="${size}x${size}"
    for density in "${densities[@]}"
    do
        if [ "${density}" == "72" ];
        then
            ## std
            resolution="${dimen}"
            scale=""
        else
            ## hires
            resolution="$(( $size * 2 ))x$(( $size * 2 ))"
            scale="@2x"
        fi
        pngfilename="${iconsetdirname}/icon_${dimen}${scale}.png"
        #echo \
        convert \
           -background "none" \
           -density "${density}" \
           -resize "${resolution}!" \
           -units "PixelsPerInch" \
           logo.svg "${pngfilename}"
        if [ "$?" -ne 0 ]; then
            echo "error creating icon file: ${pngfilename}" >&2
            exit 1
        else
          echo "wrote temp icon file: ${pngfilename}" >&2
        fi
    done
done


png2icns logo.icns "${iconsetdirname}"/icon_*.png