Reduce burden on users and maintainers via upgrade scripts

[epage]

Requiring users to pull and build large dependencies for one-off upgrades is a barrier to adoption.

What if cargo-up support rhai or lua upgrade scripts? We only need to compile or install a pre-built binary of `cargo-up. Crates could include the scripts in pre-determined locations in crates so they can be automatically be detected and ran.

[pksunkara]

The main reason for keeping this in rust is so that the migrators can use the underlying capability provided by Semantics provided by rust_analyzer which can do a lot of cool stuff.

I am not sure about rhai and if we can do the same here.

And I guess for some easy migrators that don't need all that complex stuff, we can provide an alternative way to define the script.

Requiring users to pull and build large dependencies for one-off upgrades is a barrier to adoption.

Definitely agree. Which is why we build the tool in cargo-up-cache. So it's only built for a long time during the first invocation on your system.

[epage]

Yeah, I fully agree that doing my suggestion would require writing a lot of bindings, the more featureful the scripts supported, the more bindings required.