(Yes I know it is a terrible pun at best)

diagon-ally is a CLI tool to perform transformative actions when files in a directory are changed i.e, generate/export files when a file is created/modified in a directory. In short, it is a CLI wrapper around a file watcher, with some added conveniences. It is simple to use, with minimal configuration and functionality - it is designed to do one thing (fairly) well. It was originally designed for org-diagrams, but can be used as a generic file-watcher independently as well.

Download the latest release from the releases page, make it executable and place it on your path. For example, on Linux -

curl -o diagon https://github.com/anihm136/diagon_ally/releases/download/<version>/diagon_<os>_<arch> # Replace <version>, <os> and <arch> appropriately
chmod u+x diagon

Build the binary with

go build -o diagon

Place the binary on your path. That's it

Diagon-ally watches a directory of template images, and exports them to
destination images whenever a new template is created or an existing
template is edited.

Usage:
	diagon [flags]

Flags:
	-d, --dest_dir string     Directory to export to
	-f, --force               Force creation of settings if it does not exist
	-h, --help                help for diagon
	-u, --on_update string    Command to run for export on update
	-s, --source_dir string   Directory to watch for changes

diagon-ally provides a simple configuration file, which offers only 3 options currently -

1. WatchDir: Path to watch
2. ExportDir: Path to export files to
3. OnUpdate: Command to run when a file in WatchDir is created/modified

All relative paths are resolved from the directory in which the tool is started. OnUpdate supports two variables - ${OUT}, the path to export to, and ${IN}, the path of the changed file to use as the source

The configuration file is located in the default XDG config locations - ~/.config/diagon-ally/settings.txt on *NIX, ~/Library/Application Support/diagon-ally/settings.txt on macOS and %LOCALAPPDATA%\diagon-ally\settings.txt on Windows. If no configuration file is found in these locations, default values are used

• WatchDir: ./svg
• ExportDir: ./images
• OnUpdate: inkscape --export-area-drawing --export-area-snap --export-type=png -o ${OUT} ${IN}

This tool is written in Golang, and uses the following external libraries -

• xdg for getting platform-dependent XDG directories for the settings file
• notify for watching file events
• cobra for generating the CLI tool

In addition, there is a soft dependency on Inkscape as the default export tool