Edit PlantUML diagram definition locally and see the changes on the fly

plantuml.sh

#!/bin/bash

# The only argument is the diagram definition file
test -z "$1" && (echo "Expected one filename argument"; exit 1)

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

# plantuml.jar is the PlantUML distribution as downloaded from https://plantuml.com/download 
java -jar ${script_dir}/plantuml.jar $1

# feh is a popular command-line oriented image viewer
# Shows the rendered image and updates itself if the file changes 
feh "${1%.*}.png" &

# Regenerate the image each time the diagram definition file is modified
while inotifywait --quiet --event modify $1; do
  java -jar ${script_dir}/plantuml.jar $1
done