Simple script to convert SVG icons to fitbit Grayscale Magic compatible PNGs

fitbit-svg-to-grayscale-magic-png.sh

#!/bin/bash
# Simple script to convert SVG icons to fitbit grayscale magic compatible PNGs
#  Usage: convert-svg.sh [icons-path]
#
# Author: Marco Trevisan (Treviño) <mail@3v1n0.net>
# Licensed under GPLv3

PNG_SIZE=${PNG_SIZE:-80}
icons_path=${1:-$(dirname "$0")}

if ! command -v convert &>/dev/null; then
    echo "ImageMagick's convert is needed"
    exit 1
fi

convert_svg() {
    svg="$1"
    png="$2"
    if command -v rsvg-convert &>/dev/null; then
        rsvg-convert "$svg" -w $PNG_SIZE -h $PNG_SIZE -f png -o "$png"
    elif command -v inkscape &>/dev/null; then
        if inkscape --version 2>/dev/null | grep -qs "Inkscape 0\.9[0-9]"; then
            inkscape -z -w $PNG_SIZE -h $PNG_SIZE "$svg" -e "$png"
        else
            inkscape -w $PNG_SIZE -h $PNG_SIZE "$svg" -o "$png"
        fi
    else
        echo "WARNING: rsvg-convert or inkscape not found, using ImageMagick"
        echo "         rendered PNG may not have the expected quality"
        convert -density 1200 -resize $PNG_SIZEx$PNG_SIZE "$svg" "$png"
    fi
}

for svg in "$icons_path"/*.svg; do
    png="$icons_path/$(basename "$svg" .svg)".png
    tmp="$(mktemp ${TMPDIR:-/tmp}/tmp.XXXXXXXXX.png)"
    convert_svg "$svg" "$png"
    convert "$png" -channel RGB -negate -colorspace gray -background black \
        -alpha remove -alpha off "$tmp"
    mv "$tmp" "$png"
    echo "$svg converted to $png"
done