Expose cmds as libraries

[jkylling]

I'd like to use jrsonnet for generating Kubernetes manifests in a cargo project. The ideal workflow is to be able to run cargo run --bin generate-manifests to compile jsonnet files to YAML or JSON. Here generate-manifests would be a binary effectively doing

Command::new("jsonnet").args(["--multi", "generated", "main.jsonnet"]).spawn().unwrap().wait().unwrap()

Currently, this is only possible by installing the correct version of jrsonnet or some other jsonnet implementation in an earlier step. It would be convenient if the jrsonnet CLI interface and main function could be used as a library.

[JarvisCraft]

This functionality is already available via the APIs which are used by jrsonnet CLI, thus you can use them already. Just take a look at what jrsonnet CLI does in its implementation after parsing input.

[jkylling]

What part of the jrsonnet CLI do you mean? I looked at https://github.com/CertainLach/jrsonnet/blob/a31a8ef0c0189f88ed32d84cb2dcae3b7d7861af/cmds/jrsonnet/src/main.rs which looks involved enough that I'm a bit hesitant to copy parts of it.

[bruno-delfino1995]

It's not up-to-date with this library's latest version, but I have a bare minimum here. You can ignore the external variable injection and use only the state + context + resolver pieces.