shell script to work as middleware between Sketch and and git repo. syntax: 'upload.sh [filename] "optional commit message"'

upload-sketch-to-git.sh

#!/bin/sh
# some parts of this forked from https://github.com/blended/sketch-collaboration
# cf. https://github.com/chadlavi/sketch-collaboration

if [ ! `command -v jq` ]; then
  echo "you need to install jq. If you use Homebrew, try 'brew install jq'"
  exit 1
fi

if [ -z "$1 ]; then
  echo "syntax:"
  echo "upload.sh [filename] \"optional commit message\""
  exit 1
fi

sketch_file=$1
sketch_file_base="$(basename $sketch_file)"
sketch_dir="${sketch_file_base%.*}"

return=`pwd`
cd "$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

# Pull the latest changes from the repo
 git pull

# Unzip the file
unzip -o "$sketch_file" -d "$sketch_dir"

# prettify JSON
for file in ./$sketch_dir/*.json; do 
	jq . $file | sed 's:/:\\/:g' > "$file.bak"
	mv "$file.bak" "$file"
done

# Remove the preview file
rm -Rf ./$sketch_dir/previews/

git add .
if [ -z "$2" ]; then
	git commit -m "Update (`date`)"
else
	git commit -m "$2 (`date`)"
fi
git push

cd "$return"