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#!/bin/bash
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abs() {
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[[ $[ $@ ] -lt 0 ]] && echo "$[ ($@) * -1 ]" || echo "$[ $@ ]"
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}
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DIMS=( $(identify "${1}" | cut -d\ -f3 | sed "s/x/ /g") )
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PWRS=( 16 32 128 256 512 1024 )
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for PWR in ${PWRS[@]}; do
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WIDEDIFS+=( $(abs "${DIMS[0]}-${PWR}") )
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HITEDIFS+=( $(abs "${DIMS[1]}-${PWR}") )
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done
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IFS=$'\n'
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WIDESORT=( $(sort -n <<<"${WIDEDIFS[*]}"))
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HITESORT=( $(sort -n <<<"${HITEDIFS[*]}"))
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unset IFS
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for SIZE in $((DIMS[0] - WIDESORT[0])) $((DIMS[0] + WIDESORT[0])); do
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(( SIZE > 0 && (SIZE & (SIZE - 1)) == 0 )) && RESIZE=${SIZE}
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done
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TEMPFILE=$(mktemp)
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convert "${1}" -resize ${RESIZE}x${RESIZE}\! ${TEMPFILE}
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png2icns ${1/%png/icns} ${TEMPFILE}
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rm ${TEMPFILE}
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