Package plugin (adding dependencies into .cabal and package.yaml files)

[jneira]

Add a package to your project with a handy code-action!

• Port it from haskell-ide-engine: https://github.com/haskell/haskell-ide-engine/blob/master/src/Haskell/Ide/Engine/Plugin/Package.hs
• Other already ported plugins and the examples could be used as a guide:
  • Example2 (original in hie)
  • Ormolu (original in hie)

[lukel97]

I don't think the plugin should be ported directly, as it was pretty hairy in HIE. I remember when writing it it was really destructive to .cabal files' formatting as there doesn't exist a round-trip parser. Which made it pretty useless in practice. The package.yaml part though I think could be rewritten with a roundtrip yaml parser, thanks to a GSoC project on HsYAML: https://hackage.haskell.org/package/HsYAML

[domenkozar]

I don't think the plugin should be ported directly, as it was pretty hairy in HIE. I remember when writing it it was really destructive to .cabal files' formatting as there doesn't exist a round-trip parser. Which made it pretty useless in practice. The package.yaml part though I think could be rewritten with a roundtrip yaml parser, thanks to a GSoC project on HsYAML: https://hackage.haskell.org/package/HsYAML

I'd still prefer that over nothing :)

[jneira]

This could be related with #183 (the cabal part), as both would be interface with cabal