Install packages that have `purescript-` prefix

[f-f]

Right now if you try to install a package with the purescript- prefix, you get an error message:

$ spago install purescript-parsing
spago: The following packages do not exist in your package set:
  - purescript-parsing, but `parsing` does, did you mean that instead?                                          

Instead of erroring out, we should instead just drop the purescript- prefix and install the right package

[joneshf]

Is this only a change to the install command? Will packages explicitly set as having the purescript- prefix in a package set keep their prefix?

[googleson78]

I'm for setting them without the prefix and issuing a warning about this.

[f-f]

@joneshf this is a change affecting all the code searching for dependencies, since we'll have to change the getTransitiveDependencies function.

In there we try to match on the name provided by the user and only in case of not found we try to drop the prefix and error out. So yeah, packages with the prefix in the set will of course keep the prefix, this is just a UX optimization

I also agree with @googleson78 that we should output a warning about this

[joneshf]

Gotcha, thanks for the explanation!

[f-f]

You're welcome 🙂

[jhrcek]

It seems nobody is working on this, so I'll take a look at this issue. If I don't send a PR within a week, consider my attempt failure :)

[f-f]

@jhrcek thanks! Let me know if you need any more details about the code/spec for this 😊

[jhrcek]

Implemented in #443