#!/bin/bash

# have a static preview image
bitmap="/usr/share/slic3r/Slic3r.png"

# copy extracted binary header
echo "67 33 64 72 65 6d 20 31  2e 30 20 20 20 20 20 20
3a 00 00 00 b0 38 00 00  b0 38 00 00 7e 01 00 00
be 01 00 00 00 00 00 00  01 00 00 00 19 00 03 00
64 00 00 00 dc 00 00 00  01 ff" | xxd -r -p

# append preview
if [ -f "${bitmap}" ]
then
  convert "${bitmap}" -geometry '70x50>' -background white -gravity center -extent 80x60 BMP3:-
else
  convert -size 80x60 xc:white BMP3:-
fi

# convert -size 80x60 xc:white -fill orange -draw "polygon $(./gcodepreview.py)" BMP3:-

# append gcode (data from stdin), but strip comment-only lines
#grep -v '^;'

grep -v '^;' | tee /dev/fd/3 3> >(if ! grep -q '^M104'
then
  echo "WARNING: Supplied G-code does not contain a \"set extruder temperature\" (M104) command. Please check input before proceeding." 1>&2
fi)