Provide intenllisense for possible arguments.

[zhaowenquan131]

Maybe it should be able to do something like
e.g. list all local branches when I type "git checkout" in bash in a repository folder

[cpendery]

This should be working, but the generator is failing for the script ["git","--no-optional-locks","branch","-a","--no-color","--sort=-committerdate"]. I'll look into it

[joaogsleite]

The same with npm scripts:
e.g. list all available scripts when I type npm run in a bash inside a folder with a package.json file