Outline pdf images with type 3 fonts

outline_type3.zsh

#!/usr/bin/env zsh
if [[ $# -eq 0 ]]
then
    echo 'outline_type3.zsh [option/files]'
    echo 'options:'
    echo "\t-f\ttoggle overwrite"
else 
    overwite=false
    for file in "$@"
    do
        if [[ "$file" == "-f" ]]
        then
            overwrite=!$overwite     
        elif [[ $(head -c 4 "$file") = "%PDF" && $(pdffonts $file | grep 'Type 3' | wc -l) -gt 0 ]]
        then
            echo "converting $file"
            output="$(dirname $file)/outlined-${file##*/}"
            gs -q -o $output -dNoOutputFonts -sDEVICE=pdfwrite $file
            if [ $overwrite ]
            then
                mv -f $output $file
            fi
        fi 
    done
fi
exit 0