vectorize.sh

#/usr/bin/bash

# Loop through jpg images and apply sips, mkbitmap and potrace
# http://potrace.sourceforge.net/

if [ $1 == '--help' ]; then
    echo "Two optional parameters: filename and threshold. Otherwise vectorizes as .jpg in current dir.";
    exit 1;
fi

# If there's already a bitmap directory, we probably already filled
# it with the converted bitmap files
if [ ! -d Bitmaps ]; then
    echo "making directory, Bitmaps";
    mkdir -p Bitmaps;
    sips -s format bmp *.JPG --out Bitmaps
fi

case $1 in
    # If the first argument is not a number,
    # Treat it as a file name
    ''|*[!0-9\.]*) 
    filename=$1;;
    *) echo "No filename specified, vectorizing all in current directory." ;;
esac

if [ -n "$filename" ]; then
    echo "Vectorizing" $filename;
    sips -s format bmp $filename --out .;
    # Source: https://stackoverflow.com/a/965072/2223106
    basenameonly=$(basename "$filename")
    basenameonly="${basenameonly%.*}"
    bitmap="${basenameonly##*/}".bmp;
    pbmfile="${basenameonly##*/}".pbm;
    if [[ $2 ]] ; then
        say "with threshold of " $2;
        mkbitmap -t $2 $bitmap;
    else
        mkbitmap $bitmap;
    fi
    potrace $pbmfile --svg; 
    say "One Vector generated.";
    exit 1;
fi

if [[ $1 ]] ; then
    say "Vectorizing with threshold of " $1;
    for i in Bitmaps/*.bmp; do mkbitmap -t $1 $i; done;
else
    for i in Bitmaps/*.bmp; do mkbitmap; done;
fi 

n=0
for i in Bitmaps/*.pbm; do 
    ((n++)) 
    potrace $i --svg; 
done

echo "Removing the PBM files";

rm Bitmaps/*.pbm

say $n "Vectors generated."