There are plenty of libraries that provide Cli args parsing with subcommands. In Python for example click seems quite popular, and for go there is for example cobra. These allow multiple git like sub commands within the same executable.

But what if you want a more plugin based approach like git and the go command itself. Where you can extend your application using any executable on $PATH. This repo contains a concept demonstrator go application that will do just that.

go build .

This will give an executable called mc which does the marshalling. Just running the ./mc command will provide the usage help. If we run ./mc test then we get an error saying it can't find the "test" subcommand.

For demonstration purposes we can add the current directory to $PATH.

export PATH=$PATH:$PWD

Then we can run the following commands, executing the plug-in subcommands as if they were part of the main command executable..

mc
mc bash
mc bash 1 2 3 4
mc python
mc python -c 123 ABC