create_screenshot

#!/bin/bash --login

# Parses README to get code for example, runs code, and extracts a screenshot.

FRAME=14  # Which frame number to extract

conda activate sonify

sed -n '/^.. ~BEGIN~$/,/^.. ~END~$/p' README.rst |  # (1) Extract code chunk
sed -E '/(^\.\. .*$|^$)/d' |                        # (2) Remove reST comments
sed -E 's/^[[:space:]]+//' |                        # (3) Completely un-indent
sed '1i\
import matplotlib as mpl; mpl.rcParams.update(mpl.rcParamsDefault)
' | python                                          # (4) Add extra code & run

filter="select=eq(n\,$(expr $FRAME - 1))"
ffmpeg -v warning -i *.mp4 -filter:v $filter -frames:v 1 screenshot.png

conda deactivate

if [ -x "$(command -v mogrify)" ]; then
  mogrify -resize 50% screenshot.png
else
  echo 'ImageMagick is not installed (use e.g. `brew install imagemagick` to install).'
  echo 'No screenshot resizing will be performed.'
fi

rm -i *.mp4